Note: Descriptions are shown in the official language in which they were submitted.
CA 03236004 2024-04-17
DESCRIPTION
Title of Invention: POLYTRIMETHYLENE TEREPHTHALATE FIBER AND
METHOD FOR PRODUCING SAME
Technical Field
[0001]
The present invention relates to a polytrimethylene
terephthalate fiber having excellent texturing processability
and a method for producing the same. More particularly, the
present invention is concerned with a polytrimethylene
terephthalate fiber having high elongation and high shrinkage
stress and having excellent process passing properties upon
being textured and a method for producing the same.
Background Art
[0002]
Polytrimethylene terephthalate (hereinafter, frequently
referred to simply as "PTT") is a polymer obtained by subjecting
terephthalic acid, or a lower alcohol ester of terephthalic acid,
such as dimethyl terephthalate, and trimethylene glycol (1,3-
propanediol) to polycondensation, and a fiber using the polymer
has both properties similar to those of polyamide, such as a low
modulus (soft hand feeling), excellent elastic recovery, and
dyeability, and performance similar to those of a polyethylene
terephthalate (hereinafter, frequently referred to simply as
"PET") fiber, such as a light resistance, heat setting properties,
dimensional stability, and low water absorption, and the fiber
of the polymer having such properties has been applied to BCF
carpet, brush, gut for tennis rackets, and the like.
[0003]
With respect to the polytrimethylene terephthalate fiber
(hereinafter, frequently referred to simply as "PTT fiber")
formed from the above polymer, as a form of fiber for effectively
utilizing the above-mentioned properties of the PTT fiber,
various types of textured yarns have been known. Especially, a
false twisted textured yarn of a PTT fiber has excellent elastic
recovery and softness, as compared to a fiber having a molecular
structure like that of the PTT fiber, for example, another
polyester fiber, such as a PET fiber, and is expected as an
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extremely excellent raw yarn for stretch.
[0004]
A conventional PTT fiber has essential advantages, such as
high elastic recovery and excellent softness; however, the PTT
fiber has a problem in that when texturing a PTT fiber,
particularly a PTT fiber having a small single fiber fineness,
the process passing properties are poor.
[0005]
For this reason, there is a disadvantage in that the method
for texturing a PTT fiber is restricted and hence, particularly,
properties of a textured yarn, such crimp properties cannot be
satisfactorily improved.
[0006]
For example, with respect to a PET fiber which is a
general-purpose fiber, the method for producing various textured
yarns using a partially oriented yarn (hereinafter, frequently
referred to simply as "POY") having high production rate has
been widely conducted.
Particularly, in the method using a
partially oriented yarn, such as draw false-twist texturing (so-
called "POY-DTY texturing"), a textured yarn having high
productivity and excellent crimp properties can be obtained.
[0007]
Therefore, with respect to a PTT fiber having properties
like those of the PET fiber, a number of attempts have been made
on the texturing method using a PTT partially oriented fiber
(hereinafter, frequently referred to simply as "PTT-POY").
[0008]
For example, PTL 1 has proposed a PTT-POY fiber wound at
3,300 m/minute, having a specific finishing agent applied for
improving the process passing properties of the fiber, and having
a birefringence of 0.059 and an elongation of 71%. Further, PTL
2 discloses a PTT-POY wound at 3,500 m/minute, having a specific
finishing agent applied and having a birefringence of 0.062 and
an elongation of 74%.
[0009]
However, the PTT-POY fiber disclosed in the above-
mentioned patent documents has a problem in that the yarn largely
shrinks on a bobbin having the fiber wound to press the bobbin
tight, so that the bobbin deforms, making it impossible to remove
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the cheese-form package from the spindle of the winder. Even
when a bobbin having a high strength is used for preventing such
deformation, a phenomenon called bulge such that the side wall
of the package on the bobbin becomes swollen is observed, or a
phenomenon occurs in which the yarn is firmly tightened in the
inner layer of the cheese. Further, there are problems in that
when unwinding the yarn from the bobbin, the tension is increased
and further the tension variation is increased, and in that
fluffing and yarn breaking are highly likely to occur upon
texturing using a PTT-POY fiber, or uneven crimp or uneven dyeing
is caused.
[0010]
For solving the above-mentioned problems, in PTL 3, studies
are made on the method in which, before being wound, the yarn is
heated to reduce a strain.
Further, in PTL 4, a partially
oriented yarn produced with reduced productivity at a spinning
speed of lower than 2,500 m/minute is studied. Conversely, PTL
has proposed a fiber which is wound at a spinning speed as
high as 4,500 to 8,000 m/minute, and which has a reduced peak
temperature for thermal stress.
[0011]
However, all the above-mentioned PTT fibers have a problem
about the process passing properties. Further, it is difficult
to finally produce a textured yarn having high crimp properties
from a conventional partially oriented yarn (POY) using a PTT
fiber.
Citation List
Patent Literature
[0012]
PTL 1: JPH11-229276A
PTL 2: W01999/39041 pamphlet
PTL 3: JP2001-254226A
PTL 4: JP2015-7306A
PTL 5: JP2001-348729A
Summary of Invention
Technical Problem
[0013]
In view of the above, the present invention has been made,
and an object of the invention is to provide a polytrimethylene
terephthalate fiber having excellent texturing processability
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and softness and a method for producing the same.
Solution to Problem
[0014]
The polytrimethylene terephthalate fiber of the present
invention is a fiber of polytrimethylene terephthalate, 90 mol%
or more of which is comprised of trimethylene terephthalate
repeating units, wherein the polytrimethylene terephthalate
fiber satisfies all the following requirements (A) to (C):
(A) that, in the temperature-thermal stress curve of the
fiber, a peak value of the thermal stress be present in the
temperature range of from 40 to 100 C;
(B) that the peak value of the thermal stress in the
requirement (A) be 0.1 to 0.8 cN/dtex; and
(C) that the fiber has an elongation at break of 60 to
200%.
[0015]
Further, it is preferred that the polytrimethylene
terephthalate fiber has the lowest modulus of 0.1 to 3 cN/dtex
at an elongation of 10 to 30% of the fiber, and preferred that
the polytrimethylene terephthalate fiber has a birefringence
(An) of 0.03 to 0.08 and a specific gravity of 1.319 to 1.340.
[0016]
In addition, the method for producing a polytrimethylene
terephthalate fiber of the present invention comprises melting
and solidifying polytrimethylene terephthalate, 90 mol% or more
of which is comprised of trimethylene terephthalate repeating
units, and then winding up the solidified polytrimethylene
terephthalate at a winding speed of 1,000 m/minute or more and
subsequently, heating the resultant
polytrimethylene
terephthalate using a heated roller at a temperature of the glass
transition point of polytrimethylene terephthalate 20 C, and
then drawing the heated polytrimethylene terephthalate at a draw
ratio of 1.0 to 2.0 times, and further winding the drawn
polytrimethylene terephthalate round a heated roller at 50 to
150 C, and then winding up the resultant polytrimethylene
terephthalate at a rate of 2,000 to 4,800 m/minute.
[0017]
Further, the present invention includes a textured yarn
which is obtained using the above-mentioned polytrimethylene
terephthalate fiber, the textured yarn which is a false twisted
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textured yarn, and a method for producing the textured yarn.
Advantageous Effects of Invention
[0018]
In the present invention, there are provided a
polytrimethylene terephthalate fiber having excellent strength
and texturing processability and a method for producing the same.
Brief Description of Drawings
[0019]
[FIG. 1] FIG. 1 is a diagram for explaining the maximum
value of the thermal stress in the temperature-thermal stress
curve of the fiber.
[FIG. 2] FIG. 2 is a diagram for explaining the method for
measuring a maximum crimp stress and a maximum crimp elongation.
[FIG. 3] FIG. 3 is diagrams showing examples of the shape
of a yarn having an irregular shaped cross-section and the
irregularity.
[FIG. 4] FIG. 4 is diagrams showing examples of the shape
of a yarn having a flattened cross-section and the irregularity.
Description of Embodiments
[0020]
Hereinbelow, the present invention will be described in
detail.
[0021]
(1) Polymer raw material
The polymer used in the invention is described. The
polyester polymer constituting the fiber of the invention is
polytrimethylene terephthalate (PTT), which
is comprised of
trimethylene terephthalate repeating units in an amount of
90mo1% or more. The "PTT" is a polyester having terephthalic
acid as an acid component and trimethylene glycol (referred to
also as "1,3-propanediol") as a diol component. The
PTT may
further contain a copolymerizable component in an amount of 10
mol% or less.
[0022]
Examples of such copolymerizable components include ester
forming monomers, such as sodium 5-sulfoisophthalate, potassium
5-sulfoisophthalate, tetrabutylphosphonium 3,5-
dicarboxybenzenesulfonate, tributylmethylphosphonium 3,5-
dicarboxybenzenesulfonate, 1,4-butanediol, neopentyl glycol,
1,6-hexamethylene glycol, 1,4-cyclohexanediol, 1,4-
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cyclohexanedimethanol, adipic acid, dodecanedioic acid, and 1,4-
cyclohexanedicarboxylic acid.
[0023]
Further, if necessary, an additive, such as a matting agent,
a heat stabilizer, an anti-foaming agent, a toning agent, a flame
retardant, an antioxidant, an ultraviolet light absorber, an
infrared light absorber, a nucleating agent, or a fluorescent
brightener, may be copolymerized with or mixed into the polymer.
[0024]
The polymer used in the invention preferably has an
intrinsic viscosity [n] of 0.5 to 1.5, further preferably 0.75
to 1.2. When the intrinsic viscosity of the polymer is in the
above range, a fiber having excellent strength and spinning
properties can be obtained. When the intrinsic viscosity of the
polymer is less than 0.5, the polymer has too low a molecular
weight, and hence yarn breaking and fluffing are likely to occur
upon spinning or texturing, and further it is difficult to
exhibit a strength required for a false twisted textured yarn or
the like.
Conversely, when the intrinsic viscosity of the
polymer is more than 1.5, the melt viscosity is too high, leading
to a disadvantage in that melt fracture or spinning failure
occurs upon spinning. The intrinsic viscosity [n] is a measured
value described below in the item of the Examples of the
invention.
[0025]
With respect to the method for producing the polymer used
in the invention, a conventionally known method can be used.
Specifically, terephthalic acid or dimethyl terephthalate and
trimethylene glycol are used as raw materials, and one or two or
more metal salts, such as a mixture of titanium tetrabutoxide,
calcium acetate, magnesium acetate, cobalt acetate, manganese
acetate, titanium dioxide or silicon dioxide, are added to the
raw materials, and the resultant mixture is subjected to reaction
under atmospheric pressure or under a pressure, and then a
catalyst, such as titanium tetrabutoxide or antimony acetate, is
added and the resultant mixture is subjected to reaction at 250
to 270 C under a reduced pressure. In an arbitrary stage of
polymerization, preferably before the polycondensation reaction,
a stabilizer is preferably added from the viewpoint of the
improvement of the whiteness, improvement of the melt stability,
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and controlling formation of an organic material having a
molecular weight of 300 or less, such as a PTT oligomer, acrolein,
or allyl alcohol. The stabilizer used in this case is preferably
a pentavalent or/and trivalent phosphorus compound or hindered
phenol compound.
[0026]
(2) Polytrimethylene terephthalate fiber
The polytrimethylene terephthalate fiber (PTT fiber) of
the invention is formed from the above-mentioned polymer, which
is comprised of trimethylene terephthalate repeating units in an
amount of 90mo1% or more. The PTT fiber can be obtained by melt
spinning, drawing, and heating PTT according to, for example,
the below-mentioned method.
[0027]
The PTT fiber of the invention needs to satisfy all the
following requirements (A) to (C):
(A) that, in the temperature-thermal stress curve of the
fiber, a peak value of the thermal stress be present in the
temperature range of from 40 to 100 C;
(B) that the peak value of the thermal stress in the
requirement (A) be 0.1 to 0.8 cN/dtex; and
(C) that the fiber has an elongation at break of 60 to
200%.
[0028]
First, with respect to the PTT fiber of the invention, it
is necessary that, in the temperature-thermal stress curve of
the fiber, a peak value of the thermal stress, which corresponds
to a maximum value (maximum) of the thermal stress (hereinafter,
frequently referred to as "thermal shrinkage stress"), be
present in the temperature range of from 40 to 100 C. The
expression "peak value of the thermal stress" means a value of
the maximum (peak) of the thermal stress, which corresponds to
a point in a temperature-thermal stress curve of the fiber, drawn
as shown in FIG. 1, at which a differential coefficient of the
temperature-thermal stress curve changes from positive one to
negative one. Further, the expression "maximum value of the
thermal stress" means a value of the maximum of the peak values
of the thermal stress in the whole temperature range.
[0029]
When the peak value of the thermal stress is present only
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in the temperature range of lower than 40 C, the fiber largely
shrinks after being wound, causing tight winding of the fiber.
On the other hand, when the peak value of the thermal stress is
present only in the temperature range of higher than 100 C, the
fiber has too high crystallinity, and hence a textured yarn
formed from such a fiber cannot obtain soft properties derived
from the PTT fiber. Especially when a false twisted textured
yarn is produced from the fiber, it is difficult to impart high
crimp properties to the yarn. A preferred temperature range in
which the peak value of the thermal stress is present is more
than 50 to 100 C.
[0030]
Another one or more peaks may be present, for example, in
the temperature range of 100 C or more as long as the peak value
of the thermal stress is present in the temperature range of
from 40 to 100 C as mentioned above. In this case, the peak
value or values of the thermal stress present in the temperature
range of 100 C or more may be either larger than or smaller than
the peak value of the thermal stress present in the temperature
range of from 40 to 100 C, but it is preferred that the peak
value in the temperature range of from 40 to 100 C is the maximum
value of the other peaks.
[0031]
In the PTT fiber of the invention, it is necessary that
the peak value of the thermal stress be in the range of from 0.1
to 0.8 cN/dtex. Further, the peak value of the thermal stress
is preferably in the range of from 0.11 to 0.6 cN/dtex, further
preferably 0.13 to 0.5 cN/dtex, especially preferably 0.15 to
0.4 cN/dtex. When the peak value of the thermal stress is too
small, the tension during texturing is reduced, making it
difficult to satisfactorily crimp the fiber. On the other hand,
when the peak value of the thermal stress is too large, the
tension during texturing is considerably increased, causing yarn
breaking, or losing softness.
[0032]
Further, it is necessary that the PTT fiber of the
invention have an elongation at break of 60 to 200%. When the
elongation at break of the PTT fiber is less than 60%, the
elongation is such low that fluffing and yarn breaking are likely
to occur upon spinning or texturing. On the other hand, when
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the elongation at break of the PTT fiber is more than 200%, the
degree of orientation of the fiber is too low, and hence the
fiber is easily changed with time, and, even when stored at room
temperature, the fiber is likely to become very brittle. In the
case of such a fiber, a textured yarn of industrially consistent
quality cannot be stably obtained. A preferred range of the
elongation at break is 70 to 180%, a more preferred range is 75
to 150%, and an especially preferred range is 80 to 130%.
[0033]
A most characteristic feature of the PTT fiber of the
invention is that a peak of the thermal stress of 0.1 to 0.8
cN/dtex is present in the temperature range of from 40 to 100 C.
By virtue of such a peak of the thermal shrinkage stress present
in the above-mentioned temperature range, the PTT fiber of the
invention is a fiber having the crystallinity suppressed despite
the degree of orientation. Conversely, when the crystallinity
of the PTT fiber is too high, it is likely that the peak of the
thermal stress on the high temperature side of 100 C or more is
increased, and the peak value of the thermal stress is more than
0.8 cN/dtex. Further, when the peak value of the thermal stress
is less than 0.1 cN/dtex, the degree of orientation is such small
that the subsequent process passing properties become poor,
making it impossible to achieve satisfactory texturing.
Especially, the crimp property obtained by false-twist texturing
is of an unsatisfactory level from a practical point of view.
[0034]
With respect to the PTT fiber of the invention, the peak
temperature for the thermal stress and the stress value are in
their respective appropriate ranges, and therefore the fiber has
such excellent texturing processability that tight winding of
the fiber or yarn breaking in the subsequent texturing does not
occur. Further, the fiber exhibits both excellent texturing
processability and excellent crimp property, particularly when
subjected to draw false-twist texturing.
[0035]
The PTT fiber of the invention preferably has a single
fiber fineness of 0.3 to 6.0 dtex, further preferably 0.5 to 3.2
dtex, especially preferably 0.6 to 3.0 dtex. When the single
fiber fineness of the PTT fiber is too large, the single yarn
has such large size that a cloth obtained from the yarn loses
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softness. On the other hand, when the single fiber fineness of
the PTT fiber is smaller than 0.3 dtex, yarn breaking is highly
likely to occur, making it difficult to produce a fiber.
[0036]
Further, when spinning the PTT fiber of the invention, the
number of filaments is preferably 3 to 500, further preferably
to 300, especially preferably 10 to 200. A yarn formed from
the filaments preferably has a total fineness of 10 to 200 dtex,
further preferably 20 to 150 dtex. When the total fineness of
the yarn is too small, such small total fineness makes it
difficult to texture the yarn subsequently. On the other hand,
when the total fineness of the yarn is too large, a cloth using
the resultant textured yarn disadvantageously loses softness.
[0037]
The PTT fiber of the invention preferably has a shrinkage
rate of 1 to 50% in warm water at 65 C. When the 65 C warm water
shrinkage rate of the PTT fiber is too high, it is likely that
the structure of the fiber is not fixed, and the fiber becomes
brittle even when stored at room temperature, making it difficult
to stably produce a textured yarn without suffering fluffing or
yarn breaking. On the other hand, when the shrinkage rate of
the PTT fiber in warm water at 65 C is too low, crystallization
has proceeded and therefore, the fiber is brittle or is unlikely
to be deformed, so that fluffing and yarn breaking are highly
likely to occur, making it difficult to conduct false-twist
texturing.
[0038]
The PTT fiber of the invention preferably has a fineness
variation value U% of 0 to 2%. The fineness variation value U%
of the PTT fiber is a value determined from variation of the
mass of a fiber sample by means of USTER TESTER UT-5,
manufactured by Zellweger lister, in a half Inert mode. In the
apparatus, variation of the mass can be measured from a change
of the permittivity caused when permitting a fiber sample to
pass between electrodes. When the fiber is passed through the
apparatus at a constant rate, an unevenness curve is obtained,
and thus, from the results, a fineness variation value U% (hi%)
can be determined. When the fineness variation value U% (hi%)
of the PTT fiber is more than 2%, it is likely that fluffing and
yarn breaking frequently occur upon false-twist texturing, or
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only a textured yarn having severe uneven dyeing or uneven crimp
can be obtained. The fineness variation value U% (hi%) of the
PTT fiber is preferably 1.5% or less, further preferably 1.0% or
less. The U% is preferably lower.
[0039]
The PTT fiber of the invention preferably has the lowest
modulus in the range of from 0.1 to 3 cN/dtex, further preferably
in the range of from 0.1 to 2 cN/dtex, at an elongation of 10 to
30% of the fiber. When the lowest modulus at an elongation of
to 30% of the PTT fiber is too small, a disadvantage is caused
in that the tension during texturing is reduced, making it
difficult to satisfactorily crimp the fiber, or the tension is
not stabilized when texturing the yarn, leading to uneven dyeing.
On the other hand, when the lowest modulus of the PTT fiber is
too large, a disadvantage is caused in that the tension during
texturing is increased, causing yarn breaking, or losing
softness.
[0040]
The polytrimethylene terephthalate fiber of the invention
preferably has a birefringence (An) of 0.03 to 0.08. When the
birefringence (An) of the fiber is too small, it is likely that,
for example, the process passing properties of the yarn in the
subsequent texturing accompanied by drawing become poor.
Further, there is a tendency that the crimp property obtained
after false-twist texturing is unsatisfactory. On the other
hand, when the birefringence (An) of the fiber is too large,
tight winding of the fiber is likely to occur, so that the
process passing properties upon spinning or post-texturing
become poor.
[0041]
The polytrimethylene terephthalate fiber of the invention
preferably has a specific gravity of 1.319 to 1.340. The
specific gravity of the fiber is proportional to the
crystallinity. When the specific gravity of the fiber is small,
tight winding of the fiber is likely to occur. Particularly, in
texturing the fiber while drawing, the texturing is difficult.
On the other hand, when the specific gravity of the fiber is
large, fluffing is disadvantageously highly likely to occur.
Further, when the post-texturing is false-twist texturing, there
is a tendency that it is difficult to crimp the fiber.
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[0042]
From the viewpoint of the process stability, the cross-
sectional shape of the PTT fiber of the invention is preferably
a solid circular cross-section, but the PTT fiber may be a fiber
having an irregular shaped cross-section or a hollow fiber. For
example, the PTT fiber of the invention can be composed of a
fiber having an irregular shaped cross-section, such as a
cruciform cross-section, a triangular cross-section, or a star
shaped cross-section, or a fiber having a flattened cross-
section, and, by virtue of this, unique hand feeling can be
advantageously obtained. When the irregularity or flatness is
too large, fluffing is likely to occur upon spinning, so that
the stability becomes poor.
[0043]
The above-mentioned PTT fiber of the invention is a fiber
such that the temperature range in which a peak value of the
thermal stress is present, the peak value (maximum value), and
the elongation at break are in their respective appropriate
ranges, wherein the fiber has both appropriate orientation of
the non-crystalline portion and crystallinity. The
above-
mentioned PTT fiber of the invention is advantageously used
especially in post-texturing including drawing at a high rate.
Particularly, in draw false-twist texturing, tight winding of
the fiber yarn can be suppressed before the texturing and after
the texturing. Further, by conducting POY-DTY texturing using
the PTT fiber, a textured yarn having high crimp property can be
obtained, and a false twisted textured yarn having a large
modulus (maximum crimp stress) in the process in which crimp of
the textured yarn is stretched and excellent stretch back
properties is obtained.
[0044]
Further, the PTT fiber of the invention enables stable
texturing, despite the fiber having a low single fiber fineness
and is very advantageously in production of a cloth having soft
hand feeling. In addition, even when being in the state of a
partially oriented yarn before subjected to post-texturing, the
PTT fiber of the invention maintains stable physical properties
for a long term, and thus is particularly useful from an
industrial point of view.
[0045]
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(3) Method for producing a polytrimethylene terephthalate fiber
The above-mentioned polytrimethylene terephthalate fiber
(PTT fiber) is obtained by winding up polytrimethylene
terephthalate (PTT), which is molten and then solidified, at a
winding speed of 1,000 m/minute or more and then heating the
resultant polytrimethylene terephthalate using a heated roller
at a temperature of the glass transition point of PTT 20 C ,
and then drawing the heated polytrimethylene terephthalate at a
draw ratio of 1.0 to 2.0 times, and winding the drawn
polytrimethylene terephthalate round a heated roller at 50 to
150 C and then winding up the resultant polytrimethylene
terephthalate at a rate of 2,000 to 4,800 m/minute.
[0046]
With respect to the PTT polymer which is molten and then
solidified, the winding speed of the PTT polymer immediately
after spun from a spinneret needs to be a speed of 1,000 m/minute
or more, and is further preferably a speed of 1,000 to 4,000
m/minute, especially preferably 1,300 to 3,000 m/minute. When
the PTT polymer is wound at less than 1,000 m/minute, the
orientation of mainly the non-crystalline portion of PTT is small,
so that a PTT yarn finally having satisfactory partial
orientation cannot be obtained. Further, tight winding of the
raw yarn is more severe, and the maximum value of the thermal
shrinkage stress becomes a small value. In this case, in the
subsequent false-twist texturing or the like, high crimp
property cannot be obtained.
[0047]
The temperature at which the wound PTT fiber is treated
immediately before subjected to drawing needs to be low
temperature heating in the range of the temperature of the glass
transition point of PTT 20 C. The
temperature is further
preferably in the range of from the glass transition point of
PTT -20 C to the glass transition point of PTT +10 C, especially
preferably in the range of the temperature from the glass
transition point of PTT -15 C to the glass transition point of
PTT +5 C. When the fiber is at a temperature lower than the
glass transition point of PTT -20 C, the fiber being subjected
to drawing suffers necking to cause the drawing point to be
unstable, leading to severe yarn mottle. Further, necking causes
the fiber to generate heat, so that the necking portion tends to
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be at a temperature higher than the temperature of the glass
transition point of PTT +20 C. On the other hand, when the heat
treatment is conducted using a heated roller at a temperature
higher than the glass transition point of PTT +20 C, the drawing
tension is reduced and a pitch of the running yarn is not
stabilized, so that a yarn is in contact with another one,
causing yarn breaking. Polytrimethylene terephthalate (PTT) has
a molecular structure of a zigzag configuration, which is
different from that of polyethylene terephthalate (PET) that is
a similar polyester fiber, and therefore the glass transition
point of PTT is as low as 55 C or less.
[0048]
In the method of the invention, in the heat treatment using
a heated roller at a temperature of the glass transition point
of PTT 20 C, it is preferred that the fiber is wound round a
self-driving metal roll two or more times so that the fiber is
stably in the appropriate temperature range.
[0049]
Further, it is preferred that before the above-mentioned
treatment using a low temperature heated roller, by applying
wind to the polymer, which is molten and solidified, to quickly
cool the polymer, or applying an oil agent to the polymer, the
temperature of the fiber is reduced once.
[0050]
The circumferential speed of the roller for low temperature
heating immediately before the drawing treatment is preferably
a speed of 1,000 to 4,000 m/minute, further preferably 1,300 to
3,000 m/minute, especially preferably 1,700 to 2,500 m/minute.
[0051]
In the method for producing a PTT fiber of the invention,
it is necessary that, after the treatment using a low-temperature
heated roller, drawing at a draw ratio of 1.0 to 2.0 times be
conducted. When the draw ratio is smaller than 1.0 time, that
is, the polymer is not drawn, the degree of orientation of the
non-crystalline portion of the polymer is reduced, causing a
problem, for example, in that spinning cannot be performed due
to the loosening fiber. On the other hand, when the draw ratio
is larger than 2.0 times, the crystallinity is considerably
increased, making it difficult to conduct effective post-
texturing. For
example, draw false-twist texturing cannot
14
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CA 03236004 2024-04-17
impart high crimp properties to the fiber. Further, the draw
ratio for the drawing at a low temperature is preferably more
than 1.03 to less than 2.0 times, further preferably in the range
of from 1.05 to 1.8 times, especially preferably 1.1 to 1.6
times.
[0052]
In the method of the invention, it is important that
drawing is conducted at a relatively low temperature near the
glass transition point of PTT as mentioned above. In general,
high temperature heat drawing, the orientation or crystallinity
of the polymer molecules is increased, so that the maximum value
of peak of the thermal stress shifts to the high temperature
side of 100 C or more. Such a fiber is reduced in elongation at
break, making it difficult to conduct effective post-texturing,
particularly post-texturing, such as false-twist crimping
accompanied by drawing.
[0053]
In the method of the invention, it is necessary that after
drawn at a low temperature, the fiber be heated using a heated
roller at 50 to 150 C. With respect to the treatment using a
heated roller conducted in this instance, it is preferred that
the fiber is wound round a self-driving metal roll two or more
times. When the temperature of the heated roller is lower than
50 C, the crystallinity is unsatisfactory such that the wound
yarn loosens, making impossible to achieve stable winding. On
the other hand, when the fiber is wound round a heated roller at
a temperature of higher than 150 C, the crystallinity becomes
too high, and the tension during yarn texturing is increased, so
that the draw ratio in post-texturing cannot be increased. For
example, draw false-twist texturing cannot impart satisfactory
crimp to the fiber.
[0054]
In the method for producing a PTT fiber of the invention,
the above-mentioned drawing at a relatively low temperature near
the glass transition point of PTT is performed and subsequently
thermosetting is conducted, and therefore the storage stability
and post-texturing are improved. Further, the obtained PTT fiber
is a PTT partially oriented fiber having properties similar to
those of a conventionally known PET-POY and having excellent
process passing properties.
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
[0055]
Further, after being wound round the heated roller, the
final winding speed for the PTT fiber which is molten and then
solidified needs to be in the range of from 2,000 to 4,800
m/minute. The final winding speed is further preferably in the
range of from 2,200 to 4,000 m/minute, especially preferably
2,400 to 3,500 m/minute. When the final winding speed is smaller
than 2,000 m/minute, the orientation of the fiber is low and
therefore, particularly, when the fiber is stored at a high
temperature and at a high humidity, the fiber becomes brittle,
making difficult handling of the fiber or draw false-twist
texturing. On the other hand, when the winding speed for the
PTT fiber which is molten and then solidified is more than 4,800
m/minute, crystallization has proceeded and therefore,
elongation of the fiber becomes too low, so that the fiber is
not suitable for the subsequent various post-texturing. Further,
fluffing and yarn breaking are likely to occur upon spinning or
false-twist texturing.
[0056]
The tension for winding the fiber is preferably 0.02 to
0.20 cN/dtex. In the melt spinning of PET, nylon, or the like,
which has conventionally been conducted, when the fiber is wound
with such a low tension, running of the yarn is not stabilized
and the yarn is removed from a traverse of the winder, so that
yarn breaking occurs, or a mistake of changing is caused when
automatically changing the yarn to be wound to the next bobbin
by an autowinder or the like.
[0057]
The PTT fiber, however, does not cause such a problem even
when wound with an extremely low tension, and rather, when the
PTT fiber is wound with a low tension, tight winding of the fiber
does not occur and a cheese-form package having more excellent
shape of winding can be obtained. When the tension is too low,
it is likely that traverse by a traverse guide of the winder is
difficult, so that bulge or the like occurs, causing a poor
package, or that the yarn is removed from a traverse, causing
yarn breaking. Conversely, when the tension is too high, it is
likely that tight winding of the fiber becomes more marked with
the passage of time. The
tension for winding the fiber is
further preferably 0.025 to 0.15 cN/dtex, especially preferably
16
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
0.03 to 0.10 cN/dtex.
[0058]
In the invention, in the spinning process, if necessary,
an interlacing treatment (interlace) may be performed. The
interlacing treatment may be conducted before applying a
finishing agent, before the heat treatment, or before winding,
or may be conducted in two or more sites.
[0059]
The winder used in the invention may be a winder of any of
a spindle driving system, a touch roll driving system, and a
system which is driving both a spindle and a touch roll, but the
winder of a system which is driving both a spindle and a touch
roll is preferred for winding the yarn in a large amount. In
the case where only one of the touch roll and the spindle is
driven, another one is rotated due to friction caused by a
driving shaft, and therefore sliding causes a difference in the
surface speed between the bobbin fitted to the spindle and the
touch roll. For this reason, when the yarn is wound round the
spindle from the touch roll, the yarn is likely to be stretched
or loosened to change the tension, so that the shape of winding
becomes poor or the yarn suffers a damage due to abrasion. When
driving both the spindle and the touch roll, a difference in the
surface speed between the touch roll and the bobbin can be
controlled to reduce sliding, achieving excellent yarn quality
or excellent shape of winding.
[0060]
When winding the fiber, the lead angle is preferably 3.5
to 11 . When the lead angle is less than 3.5 , the yarns unlikely
cross each other and hence easily slide, so that cob-webbing and
bulge are likely to occur. On the other hand, when the lead
angle is more than 11 , the amount of the yarn wound round the
end portion of the bobbin is increased, so that the diameter of
the end portion is large, as compared to that of the middle
portion. For this reason, when winding the yarn, only the end
portion is in contact with the touch roll, causing the yarn
quality to be poor, and further the tension variation is
increased when unwinding the wound yarn, so that fluffing and
yarn breaking are highly likely to occur. The lead angle is
further preferably 4 to 10 , especially preferably 5 to 9 . Thus,
a cheese-form package composed of the specific polyester fiber
17
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
of the invention can be obtained.
[0061]
The PTT fiber obtained by the above-mentioned method of
the invention is a so-called partially oriented fiber (POY),
which is a fiber such that polymer molecules constituting the
fiber are oriented to an appropriate extent. In a method for
producing a POY of a general polyester fiber, only high rate
spinning in which the take-up rate (spinning speed) after melt-
extrusion is 2,500 m/minute or more is performed, and generally,
such a drawing treatment that the elongation is lowered is not
conducted. In
contrast, the requirements of the invention
include drawing at a relatively low temperature near the glass
transition point of PTT and a heat treatment at a high
temperature for improving the storage stability and texturing
processability of PTT. In the method of the invention, drawing
at a low temperature is conducted and subsequently the heat
treatment is immediately performed, and thus an effect is
obtained such that the storage stability of the PTT fiber is
improved.
[0062]
(4) Textured yarn comprising a polytrimethylene terephthalate
fiber
The textured yarn of the present invention is a textured
yarn which is obtained using the above-described
polytrimethylene terephthalate fiber (PTT fiber). Further, the
textured yarn of the invention is preferably a false twisted
textured yarn.
[0063]
The false twisted textured yarn which is a preferred
embodiment of the present invention preferably satisfies the
physical properties mentioned below.
[0064]
Specifically, it is preferred that the polytrimethylene
terephthalate false twisted textured yarn (hereinafter,
frequently referred to as "PTT false twisted textured yarn") is
formed from polytrimethylene terephthalate, which is comprised
of trimethylene terephthalate repeating units in an amount of 90
mol% or more, and satisfies all the following requirements (1)
to (6):
[0065]
18
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
(1) single fiber fineness: 3.2 dtex or less;
(2) breaking strength 2.5 cN/dtex;
(3) elongation at break: 20 to 80%;
(4) maximum crimp elongation 150%; and
(5) maximum crimp stress 0.020 cN/dtex.
[0066]
The PTT false twisted textured yarn in the invention
preferably has a single fiber fineness of 3.2 dtex or less.
Further, the single fiber fineness of the yarn is preferably 0.1
dtex or more, or 0.3 to 3.2 dtex, more preferably 0.5 to 3.0
dtex, further preferably 0.6 to 2.4 dtex. When the single fiber
fineness of the yarn is larger than 3.2 dtex, the single yarn
having such a large size loses cloth softness. On the other
hand, when the single fiber fineness of the yarn is too small,
yarn breaking is highly likely to occur, making it difficult to
produce a fiber.
[0067]
The PTT false twisted textured yarn in the invention
preferably has a breaking strength of 2.5 cN/dtex or more, more
preferably in the range of from 2.5 to 4.0 cN/dtex, especially
preferably in the range of from 2.7 to 3.7 cN/dtex. When the
breaking strength of the yarn is smaller than 2.5 cN/dtex,
practical use of the yarn is difficult.
[0068]
The PTT false twisted textured yarn in the invention
preferably has an elongation at break of 20 to 80%, further
preferably in the range of from 22 to 70%, especially preferably
26 to 60%. When the elongation at break of the yarn is less
than 20%, the elongation is such low that fluffing and yarn
breaking are likely to occur upon spinning or false-twist
texturing. On the other hand, when the elongation at break of
the yarn is more than 80%, it is likely that plastic deformation
of the fiber is so marked that the form stability becomes poor.
[0069]
The PTT false twisted textured yarn in the invention
preferably has a maximum crimp elongation of 150% or more. When
the maximum crimp elongation of the yarn is less than 150%, it
is likely that the crimp elongation is such low that satisfactory
stretchability cannot be obtained.
[0070]
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Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
The PTT false twisted textured yarn in the invention
preferably has a maximum crimp stress of 0.020 cN/dtex or more.
When the maximum crimp stress of the yarn is less than 0.020
cN/dtex, it is likely that the crimp stress is reduced so that
the stretch back properties become poor.
[0071]
Conventionally, there has not been obtained a PTT fiber
textured yarn of stable quality having excellent crimp
properties and a large elongation at break, wherein the yarn is
formed from such a thin PTT fiber having excellent hand feeling
and touch feeling. In the invention, with respect to the PTT
fiber such that the temperature range in which a maximum value
of the thermal stress is present, the maximum value, and the
elongation at break are in their respective appropriate ranges,
by using the PTT fiber in post-texturing, a post-textured yarn
having such excellent physical properties can be obtained. A
polyester textured yarn having excellent stretchability even
under a low load, which is the feature of the PTT fiber, can be
obtained.
[0072]
Further, the PTT false twisted textured yarn in the
invention preferably has a fineness variation value U% (normal %)
of 2.0% or less. When the fineness variation value U% (normal %)
of the yarn is more than 2.0%, it is likely that fluffing and
yarn breaking frequently occur especially upon false-twist
texturing, so that a false twisted textured yarn having severe
uneven dyeing or uneven crimp is obtained. The U% (normal %) is
preferably 1.5% or less. The U% is preferably lower.
[0073]
The fineness variation value U% (normal %) of the false
twisted textured yarn is a value determined from variation of
the mass of a fiber sample by means of USTER TESTER UT-5,
manufactured by Zellweger lister. In the apparatus, variation of
the mass can be measured from a change of the permittivity caused
when permitting a fiber sample to pass between electrodes. When
the fiber is passed through the apparatus at a constant rate, an
unevenness curve is obtained. From
the results, a fineness
variation value U% (normal %) can be determined.
[0074]
Further, the PTT false twisted textured yarn in the
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
invention preferably has a total fineness of 10 to 200 dtex,
further preferably in the range of from 15 to 150 dtex,
especially preferably 20 to 60 dtex. When the total fineness of
the yarn is smaller than 10 dtex, such small total fineness makes
it difficult to produce a textured yarn. On the other hand,
when the total fineness of the yarn is larger than 200 dtex, a
cloth obtained from the yarn disadvantageously loses softness.
[0075]
Further, the PTT false twisted textured yarn in the
invention can be composed of a fiber having an irregular shaped
cross-section, such as a cruciform cross-section, a triangular
cross-section, or a star shaped cross-section, and, by virtue of
this, unique hand feeling can be advantageously obtained. The
irregularity of the fiber having an irregular shaped cross-
section is a value determined by measuring a maximum inscribed
circle radius r and a minimum circumcircle radius R of the cross-
section of the fiber as shown in FIG. 3, and calculating an
irregularity = R/r, and, in the invention, the value of
irregularity = R/r is preferably 1.15 to 10.0, further preferably
1.2 to 10Ø When the irregularity of the cross-section is less
than 1.15, a difference between the irregular shaped cross-
section and a circular cross-section is disadvantageously small.
On the other hand, when the irregularity of the cross-section is
more than 10.0, it is likely that a difference in the orientation
between the outside and inside of the yarn cross-sectional shape
or the like is increased upon spinning, so that the obtained
yarn has suffered such severe fluffing and loosening that it is
unsuitable for texturing.
[0076]
The PTT false twisted textured yarn in the invention can
be composed of a fiber having a flattened cross-section, and, by
virtue of this, unique hand feeling can be advantageously
obtained. The flatness of the fiber having a flattened cross-
section is a value determined by drawing a rectangle
circumscribing the cross-section of the fiber as shown in FIG.4,
and measuring a long side L and a short side H of the rectangle,
and calculating a flatness = L/H, and, in the invention, the
value of flatness = L/H is preferably 2.0 to 10Ø When the
flatness of the flattened cross-section is less than 2.0, a
difference between the flattened cross-section and a circular
21
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CA 03236004 2024-04-17
cross-section is disadvantageously small. On the other hand,
when the flatness of the cross-section is more than 10.0,
fluffing is likely to occur upon spinning, so that the stability
becomes poor.
[0077]
(5) Method for producing a textured yarn comprising a
polytrimethylene terephthalate fiber
The above-described PTT textured yarn of the invention can
be produced by subjecting the above-mentioned polytrimethylene
terephthalate fiber (PTT fiber) of the invention to texturing.
Further, the textured yarn of the invention is preferably a false
twisted textured yarn produced by subjecting the PTT fiber of
the invention to false-twist texturing.
[0078]
Specifically, the PTT textured yarn of the invention can
be obtained by subjecting to post-texturing a PTT fiber, which
is formed from polytrimethylene terephthalate, which is
comprised of trimethylene terephthalate repeating units in an
amount of 90 mol% or more, and which satisfies all the following
requirements (A) to (C):
(A) that, in the temperature-thermal stress curve of the
fiber, a maximum value of the thermal stress be present in the
temperature range of from 40 to 100 C;
(B) that the maximum value of the thermal stress in the
requirement (A) be 0.1 to 0.8 cN/dtex; and
(C) that the fiber has a lowest modulus of 0.1 to 2 cN/dtex
at an elongation of 10 to 30% of the fiber.
[0079]
The requirements (A) to (C) are like the above-described
requirements of the PTT fiber of the invention.
[0080]
Further, in the method for producing a PTT textured yarn
of the invention, it is preferred that the PTT textured yarn has
the above-mentioned physical properties of the PTT textured yarn.
[0081]
In the invention, by false-twist texturing the above-
mentioned PTT fiber, for example, under the conditions shown
below, an intended PTT false twisted textured yarn can be
obtained.
= Conditions for false-twisting
22
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CA 03236004 2024-04-17
Type of false twister: HTS-15V, manufactured by TMT
Machinery, Inc. (disc false-twisting system)
Number of revolutions of disc: 1,000 to 20,000 rpm (disc
diameter: 3 to 10 cm)
Feed speed: 500 to 1,000 m/minute
First feed ratio: -5.0 to +5.0%
First heater temperature (non-contact type): 200 to 300 C
Second heater temperature (non-contact type): 150 to 250 C
Second feed nip roller speed: 600 to 1,500 m/minute
Second feed ratio: -5.0 to +5.0%
Feed ratio before wound: -5.0 to +5.0%
In addition to the above-mentioned draw false-twist
texturing machine of a disc type, a false-twist texturing machine
of a friction type, such as a belt nip type, is suitable for
draw false-twist texturing at a high rate with high productivity,
which effectively utilizes the characteristic features of the
PTT fiber of the invention. Besides, a false-twist texturing
machine of a conventional type, such as a pin type or an air
twisting type, can be used.
[0082]
The above-described PTT fiber of the invention is a fiber
such that the temperature range in which a peak value of the
thermal stress is present, the peak value, and the elongation at
break are in their respective appropriate ranges, wherein the
fiber has both appropriate orientation and crystallinity.
Therefore, the method for producing a textured yarn using the
PTT fiber is advantageous in that an occurrence of fluffing and
the like are well suppressed even when using the PTT fiber,
achieving excellent process passing properties in the subsequent
step. The method for producing a textured yarn using the PTT
fiber is suitable particularly for a method including drawing at
a high speed, for example, a method using draw false-twist
texturing. Further, a PTT textured yarn having such a small
single fiber fineness that process passing properties are
generally difficult to obtain can be obtained by the method.
[0083]
In the method for producing a PTT textured yarn of the
invention, a satisfactory thermal stress is caused in the
texturing step, enabling stable texturing.
Therefore, the
23
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
modulus in the process in which crimp of the PTT textured yarn
is stretched is increased, so that a PTT false twisted textured
yarn having a large maximum crimp stress and excellent stretch
back properties can be obtained.
[0084]
The present invention includes the following inventions.
[0085]
1. A fiber of polytrimethylene terephthalate, which is
comprised of trimethylene terephthalate repeating units in an
amount of 90 mol% or more, the polytrimethylene terephthalate
fiber satisfying all the following requirements (A) to (C):
(A) that, in the temperature-thermal stress curve of the
fiber, a peak value of the thermal stress be present in the
temperature range of from 40 to 100 C;
(B) that the peak value of the thermal stress in the
requirement (A) be 0.1 to 0.8 cN/dtex; and
(C) that the fiber has an elongation at break of 60 to
200%.
[0086]
2. The polytrimethylene terephthalate fiber according to
item 1 above, which has the lowest modulus of 0.1 to 3 cN/dtex
at an elongation of 10 to 30% of the fiber.
[0087]
3. The polytrimethylene terephthalate fiber according to
item 1 or 2 above, which has a birefringence (An) of 0.03 to
0.08 and a specific gravity of 1.319 to 1.340.
[0088]
4. A method for producing a polytrimethylene terephthalate
fiber, comprising melting and solidifying polytrimethylene
terephthalate, which is comprised of trimethylene terephthalate
repeating units in an amount of 90 mol% or more, and then winding
up the solidified polytrimethylene terephthalate at a winding
speed of 1,000 m/minute or more and subsequently, heating the
resultant polytrimethylene terephthalate using a heated roller
at a temperature of the glass transition point of
polytrimethylene terephthalate 20 C, and then drawing the
heated polytrimethylene terephthalate at a draw ratio of 1.0 to
2.0 times, and further winding the drawn polytrimethylene
terephthalate round a heated roller at 50 to 150 C, and then
winding up the resultant polytrimethylene terephthalate at a
24
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
speed of 2,000 to 4,800 m/minute.
[0089]
5. A textured yarn which is obtained using the
polytrimethylene terephthalate fiber according to any one of
items 1 to 3 above.
[0090]
6. The textured yarn according to item 5 above, which is
a false twisted textured yarn.
[0091]
7. A method for producing the textured yarn according to
item 5 above.
[0092]
8. A polytrimethylene terephthalate false twisted textured
yarn which is formed from polytrimethylene terephthalate, which
is comprised of trimethylene terephthalate repeating units in an
amount of 90 mol% or more, the polytrimethylene terephthalate
false twisted textured yarn satisfying all the following
requirements (1) to (6):
(1) single fiber fineness: 3.2 dtex or less;
(2) breaking strength 2.5 cN/dtex;
(3) elongation at break: 20 to 80%;
(4) maximum crimp elongation 150%; and
(5) maximum crimp stress 0.020 cN/dtex.
[0093]
9. The polytrimethylene terephthalate false twisted
textured yarn according to item 8 above, which has a total
fineness of 10 to 200 dtex.
[0094]
10. The polytrimethylene terephthalate false twisted
textured yarn according to item 8 or 9 above, which comprises a
fiber having an irregular shaped cross-section, wherein the
fiber having an irregular shaped cross-section has an
irregularity of 1.15 to 10Ø
[0095]
11. The polytrimethylene terephthalate false twisted
textured yarn according to any one of items 8 to 10 above, which
comprises a fiber having a flattened cross-section, wherein the
fiber having a flattened cross-section has a flatness of 2.0 to
10Ø
[0096]
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
12. A method for producing a textured yarn, the method
comprising texturing the polytrimethylene terephthalate fiber
according to any one of items 1 to 3 above.
[0097]
13. A method for producing a false twisted textured yarn,
the method comprising false-twist texturing the polytrimethylene
terephthalate fiber according to any one of items 1 to 3 above.
Examples
[0098]
Hereinbelow, the present invention will be described in
more detail with reference to the following Examples and
Comparative Examples, which should not be construed as limiting
the scope of the invention. In the following Examples,
measurement for the individual items was conducted by the methods
described below.
[0099]
(1) Intrinsic viscosity [n]
An intrinsic viscosity [n] was determined using an Ostwald
viscometer by extrapolating the ratio risp/C of the specific
viscosity nsp in o-chlorophenol at 35 C to the concentration C
(g/100 ml) to a concentration of zero according to the following
formula (1).
[0100]
[11] = limc->o(nsp/C) (1)
(2) Specific gravity
A specific gravity of a sample was measured in accordance
with the sink-float method of JIS-L-1013 8.17.1.
[0101]
(3) Birefringence (An)
A birefringence was determined in accordance with Sen-i
Binran-Genryou Hen (Fiber Handbook-Raw Material Edition), p. 969
(the fifth edition, published by Maruzen Co., Ltd. in 1978),
using an optical microscope and a compensator, from retardation
of the polarized light observed on the surface of a fiber.
[0102]
(4) Temperature in which a maximum value of the thermal stress
is present and maximum value of the thermal stress
KE-2, manufactured by Kanebo Engineering Co., Ltd., was
used. Measurement was conducted under an initial load of 0.044
26
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
cN/dtex at a temperature increase rate of 100 C/minute. With
respect to the obtained data, a temperature was plotted on the
abscissa and a thermal stress (thermal shrinkage stress) was
plotted on the ordinate to draw a temperature-thermal stress
curve. A temperature and a thermal stress (thermal shrinkage
stress) of the point at which a differential coefficient of the
temperature-thermal stress curve changes from positive one to
negative one were determined, and the stress was divided by the
fineness to determine a maximum stress.
[0103]
(5) 65 C hot water shrinkage rate (HWS)
In accordance with JIS-L-1013, using hot water at a
temperature of 65 C, a hank dimensional change ratio was obtained
and determined as a shrinkage rate in hot water at 65 C.
[0104]
Using a sizing reel having a frame circumference of 1.125
m, an initial load of 0.27 cN/dtex was applied and winding was
made at a speed of 120 winding/minute to form a small hank such
that the number of winding was 40, and a load 20 times the
initial load was applied to the hank and a hank length Lo (mm)
was measured. Then, the load was removed, and the sample was
immersed in hot water at 65 C for 30 minutes and then removed,
and subjected to air-drying and further a load 20 times the
initial load was applied to the hank and a hank length L1 (mm)
was measured, and a hot water shrinkage rate was calculated from
the following formula.
HWS (%) = (Lo - 1,1)/L0 x 100
[0105]
(6) Fineness
A fineness of a multifilament yarn was measured in
accordance with JIS-L-1013. Further, a single fiber fineness
was determined by dividing the obtained value by the number of
single filament of the multifilament yarn.
[0106]
(7-1) Fineness variation value U% (PTT fiber; hi%)
Using USTER TESTER UT-5, manufactured by Zellweger lister,
measurement was conducted in a half Inert mode under the
conditions shown below.
Yarn feed speed: 400 m/minute
Length of yarn measured: 2,000 m
27
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
[0107]
(7-2) Fineness variation value U% (textured yarn; normal %)
Using USTER TESTER UT-5, manufactured by Zellweger lister,
measurement was conducted by the method shown below.
Conditions for measurement
Mode: Normal mode
Speed of yarn: 200 m/minute
Number of twists: 10,000/minute S twisting
Tension range: 10
Length of fiber measured: 2,000 m
Yarn feed speed: 400 m/minute
Length of yarn measured: 2,000 m
[0108]
(8) Breaking strength and elongation at break (fiber breaking
strength and fiber elongation at break)
In accordance with JIS-L-1013, using Tensilon,
manufactured by Orientec Co., Ltd., which is a tensile tester of
a type of constant speed of extension, measurement was conducted
with a length of specimen between grips of 20 cm and at a speed
of pulling of 20 cm/minute.
[0109]
(9) Lowest modulus at an elongation of 10 to 30% of the fiber
In accordance with JIS-L-1013, using Tensilon,
manufactured by Orientec Co., Ltd., which is a tensile tester of
a type of constant speed of extension, measurement was conducted
with a length of specimen between grips of 20 cm and at a speed
of pulling of 20 cm/minute. With respect to the tangent line of
the SS curve at an elongation of 10 to 30%, the slope of a
tangent line having the smallest slope was determined as a
modulus.
[0110]
(10) Glass transition point
A glass transition point was determined by sealing a
specified amount of polymer chips in an aluminum sample pan, and
increasing the temperature from room temperature to 300 C at a
temperature increase rate of 10 C /minute in a nitrogen gas
atmosphere by differential scanning calorimeter measurement
(DSC) to obtain a temperature increase curve, and measuring a
glass transition point from the curve.
[0111]
28
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(11) Crimp property
A sample of a polyester false twisted textured yarn was
wound round a hank frame under a tension of 0.044 cN/dtex to
form a hank having a size of about 3,300 dtex. Two loads of
0.00177 cN/dtex and 0.177 cN/dtex were applied to one end of the
hank, and, after the passage of one minute, a length So (cm) was
measured.
[0112]
Then, the load of 0.177 cN/dtex was removed from the hank
and the hank in this state was treated in boiling water at 100 C
for 20 minutes. After the treatment in boiling water, the load
of 0.00177 cN/dtex was removed from the hank, and the hank in a
free state without a load was subjected to air-drying for 24
hours, and loads of 0.00177 cN/dtex and 0.177 cN/dtex were
further applied to the hank, and, after the passage of one minute,
a length S1 (cm) was measured.
[0113]
Then, the load of 0.177 cN/dtex was removed from the hank,
and, after the passage of one minute, a length S2 was measured,
and a crimp degree was calculated from the following formula,
and an average of ten measured values was determined.
Crimp degree (%) = [(S1 - S2)/S0] x 100
A sample such that the crimp degree was 30% or more was
considered to have high crimp property, and was rated A, and a
sample such that the crimp degree was less than 30% was not
considered to have high crimp property, and was rated B.
[0114]
(12) Maximum crimp stress and maximum crimp elongation of a false
twisted textured yarn
A stress-elongation curve of a false twisted textured yarn
is measured by the method described below under the conditions
shown below.
a. A false twisted textured yarn is treated in boiling
water for 30 minutes and then removed from the water, and allowed
to stand and dried in air at room temperature for 4 hours or
longer. Then,
in accordance with JIS-L-1013 (tensile test
method), a stress-elongation curve in which the full stress is
up to 0.882 cN/dtex is drawn.
b. On the stress-elongation curve obtained by the
measurement by the above-mentioned method under the conditions
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shown above, as shown in FIG. 1, a point of intersection of the
tangent line of the curve for the process (initial) in which
crimp is stretched and the tangent line of the curve for the
process in which the fiber per se is stretched is determined. A
value obtained by dividing a stress corresponding to the point
of intersection by the fineness of the textured yarn is
determined as a maximum crimp stress. Further, an elongation
corresponding to the point of intersection is determined as a
maximum crimp elongation.
[0115]
[Example 1]
Dimethyl terephthalate and 1,3-propanediol in a 1:2 molar
ratio were charged, and titanium tetrabutoxide in an amount
corresponding to 0.1% by weight of the dimethyl terephthalate
was added and a transesterification reaction of the resultant
mixture was completed under atmospheric pressure at a heater
temperature of 240 C. Then, titanium tetrabutoxide in an amount
corresponding to 0.1% by weight of the theoretical polymer amount
and titanium dioxide in an amount corresponding to 0.5% by weight
of the theoretical polymer amount were further added, and the
resultant mixture was subjected to reaction at 270 C for 3 hours.
The obtained polymer was comprised of trimethylene terephthalate
repeating units (100 mol%), and had an intrinsic viscosity of
1Ø
[0116]
Further, the obtained polymer had a glass transition point
of 51 C.
[0117]
The obtained polymer was dried by a general method so that
the water content became 50 ppm, and then molten at 265 C, and
extruded through a spinneret having 36 holes each having a
diameter of 0.27 mm formed in a single line at a throughput rate
of 25.9 g/minute.
[0118]
The extruded molten multifilament was quickly cooled by
applying thereto wind at a wind speed of 4.0 m/minute and changed
to a solid multifilament, and then, using a guide nozzle, an oil
agent containing 60% by weight of octyl stearate, 15% by weight
of polyoxyethylene alkyl ether, and 3% by weight of potassium
phosphate in the form of a water emulsion finishing agent having
Date Regue/Date Received 2024-04-17
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a concentration of 10% by weight was applied to the solid
multifilament so that the amount of the oil agent applied became
0.6% by weight, based on the weight of the fiber.
[0119]
Then, the solid multifilament was wound round a roll heated
to 55 C at a circumferential speed of 2,100 m/minute, and then
wound round a roll heated to 80 C so as to be drawn at a draw
ratio of 1.3 times, and then, using a winder of a system that
drives both a spindle and a touch roll, the resultant
multifilament was wound up at a winding speed of 2,600 m/minute,
obtaining a cheese-form package having wound 100 dtex/36
filaments (f). Physical properties of the obtained fiber are
shown in Table 1. A thermal stress of the obtained fiber was
measured, and the results of the measurement showed that the
temperature of the first peak of the thermal stress was 61 C and
the first peak of the thermal stress was a value as large as
0.20 cN/dtex, but the temperature of the second peak of the
thermal stress was 191 C and the second peak of the thermal
stress was a value as small as 0.08 cN/dtex or less.
[0120]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing for drawing
at a draw ratio of 1.3 times was conducted under the conditions
shown below so that the obtained textured yarn had an elongation
of 40%. Crimp properties of the obtained false twisted textured
yarn are shown in Table 1.
= Conditions for false-twisting
Type of false twister: HTS-15V, manufactured by TMT
Machinery, Inc. (disc false-twisting system)
Number of revolutions of disc: 5,900 rpm (disc diameter:
5.8 cm)
Feed rate: 462 m/minute
First feed ratio: 0%
First heater temperature (non-contact type): 280 C
Second heater temperature (non-contact type): 180 C
Second feed nip roller rate: 600 m/minute
Second feed ratio: 1.0%
Feed ratio before wound: 3.0%.
[0121]
[Example 2]
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Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer, the
heat treatment after applying an oil agent, and the draw ratio
were changed, obtaining a cheese-form package having wound 100
dtex/36 filaments (f).
[0122]
Specifically, the solid multifilament was wound round the
roll heated to 55 C at a circumferential speed which was
increased from 2,100 m/minute to 2,300 m/minute, and at a draw
ratio which was changed from 1.3 times to 1.2 times, and then
wound round a roll heated to 100 C, instead of the heated roller
at 80 C. Then, using a winder of a system that drives both a
spindle and a touch roll, the resultant multifilament was wound
up at a winding speed of 2,650 m/minute. The polymer throughput
rate was controlled to adjust the final fineness.
[0123]
Physical properties of the obtained fiber are shown in
Table 1. A thermal stress of the obtained fiber was measured,
and the results of the measurement showed that the temperature
of the first peak of the thermal stress was 61 C and the first
peak of the thermal stress was a value as large as 0.17 cN/dtex,
but the temperature of the second peak of the thermal stress was
191 C and the second peak of the thermal stress was a value as
small as 0.08 cN/dtex or less.
[0124]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing for drawing
at a draw ratio of 1.3 times was conducted under the same
conditions as those in Example 1 so that the obtained textured
yarn had an elongation of 40%. Crimp properties of the obtained
false twisted textured yarn are shown in Table 1.
[0125]
[Example 3]
Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer, the
heat treatment after applying an oil agent, and the draw ratio
were changed, obtaining a cheese-form package having wound 100
dtex/36 filaments (f).
[0126]
Specifically, the solid multifilament was wound round the
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roll heated to 55 C at a circumferential speed which was
increased from 2,100 m/minute to 2,500 m/minute, and at a draw
ratio which was changed from 1.3 times to 1.1 times, and then
wound round a roll heated to 100 C, instead of the heated roller
at 80 C. Then, using a winder of a system that drives both a
spindle and a touch roll, the resultant multifilament was wound
up at a winding speed of 2,700 m/minute. The polymer throughput
rate was controlled to adjust the final fineness.
[0127]
Physical properties of the obtained fiber are shown in
Table 1. A thermal stress of the obtained fiber was measured,
and the results of the measurement showed that the temperature
of the first peak of the thermal stress was 60 C and the first
peak of the thermal stress was a value as large as 0.13 cN/dtex,
but the temperature of the second peak of the thermal stress was
191 C and the second peak of the thermal stress was a value as
small as 0.08 cN/dtex or less.
[0128]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing was
conducted under substantially the same conditions as those in
Example 1, except that the draw ratio was changed to 1.35 times,
so that the obtained textured yarn had an elongation of 40%.
Crimp properties of the obtained false twisted textured yarn are
shown in Table 1.
[0129]
[Example 4]
Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer was
changed, and that the intrinsic viscosity of the
polytrimethylene terephthalate polymer was changed to 1.3 from
1.0 in Example 1, obtaining a solid multifilament having an oil
agent applied thereto.
[0130]
Then, the solid multifilament was wound round the roll
heated to 55 C at a circumferential speed which was increased to
2,160 m/minute, and further wound round a roll heated to 80 C so
as to be drawn at a draw ratio of 1.2 times, and then, using a
winder of a system that drives both a spindle and a touch roll,
the resultant multifilament was wound up at a winding speed of
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2,500 m/minute, obtaining a cheese-form package having wound 100
dtex/36 filaments (f). The
polymer throughput rate was
controlled to adjust the final fineness. The obtained polymer
had a glass transition point temperature of 52 C, whereas that
in Example 1 was 51 C.
[0131]
Physical properties of the obtained fiber are shown in
Table 1. A thermal stress of the obtained fiber was measured,
and the results of the measurement showed that the temperature
of the first peak of the thermal stress was 63 C and the first
peak of the thermal stress was a value as large as 0.30 cN/dtex,
but the temperature of the second peak of the thermal stress was
191 C and the second peak of the thermal stress was a value as
small as 0.08 cN/dtex or less.
[0132]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing was
conducted under substantially the same conditions as those in
Example 1, except that the draw ratio was changed to 1.2 times,
so that the obtained textured yarn had an elongation of 40%.
Crimp properties of the obtained false twisted textured yarn are
shown in Table 1.
[0133]
[Example 5]
Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer, and
the heat treatment temperature after applying an oil agent, i.e.,
the fiber temperature during the drawing treatment were changed,
obtaining a cheese-form package having wound 100 dtex/36
filaments (f).
[0134]
Specifically, the solid multifilament was wound round the
heated roll at a temperature which was changed from 55 C to 40 C,
at a circumferential speed which was reduced from 2,100 m/minute
to 2,000 m/minute, and at a draw ratio which was still 1.3 times,
and then wound round a roll heated to 100 C, instead of the
heated roller at 80 C. Then, using a winder of a system that
drives both a spindle and a touch roll, the resultant
multifilament was wound up at a winding speed of 2,550 m/minute,
obtaining a cheese-form package having wound 100 dtex/36
34
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filaments (f). The polymer throughput rate was controlled to
adjust the final fineness.
[0135]
Physical properties of the obtained fiber are shown in
Table 1. A thermal stress of the obtained fiber was measured,
and the results of the measurement showed that the temperature
of the first peak of the thermal stress was 61 C and the first
peak of the thermal stress was a value of 0.22 cN/dtex, which
was larger than that in Example 1. Further, the results showed
that the temperature of the second peak of the thermal stress
was 191 C and the second peak of the thermal stress was a value
as small as 0.08 cN/dtex or less, which was like that in Example
1.
[0136]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing was
conducted under substantially the same conditions as those in
Example 1, except that the draw ratio was changed to 1.35 times,
so that the obtained textured yarn had an elongation of 40%.
Crimp properties of the obtained false twisted textured yarn are
shown in Table 1. The strength of the false twisted textured
yarn was lowered, as compared to that in Example 1, but the crimp
property was further excellent, as compared to that in Example
1.
[0137]
[Example 6]
Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer, and
the heat treatment temperature after applying an oil agent, i.e.,
the fiber temperature during the drawing treatment were changed,
obtaining a cheese-form package having wound 100 dtex/36
filaments (f).
[0138]
Specifically, the solid multifilament was wound round the
heated roll at a temperature which was changed from 55 C to 60 C,
at a circumferential speed which was reduced from 2,100 m/minute
to 2,000 m/minute, and at a draw ratio which was still 1.3 times,
and then wound round a roll heated to 100 C, instead of the
Date Regue/Date Received 2024-04-17
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heated roller at 80 C. Then, using a winder of a system that
drives both a spindle and a touch roll, the resultant
multifilament was wound up at a winding speed of 2,550 m/minute,
obtaining a cheese-form package having wound 100 dtex/36
filaments (f). The polymer throughput rate was controlled to
adjust the final fineness.
[0139]
Physical properties of the obtained fiber are shown in
Table 1. A thermal stress of the obtained fiber was measured,
and the results of the measurement showed that the temperature
of the first peak of the thermal stress was 63 C, and the first
peak of the thermal stress was 0.13 cN/dtex, which was like those
in other Examples. The results showed that the temperature of
the second peak of the thermal stress was 191 C, which was like
those in other Examples, but the second peak of the thermal
stress was a value as high as 0.09 cN/dtex.
[0140]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing was
conducted under substantially the same conditions as those in
Example 1, except that the draw ratio was changed to 1.35 times,
so that the obtained textured yarn had an elongation of 40%.
Crimp properties of the obtained false twisted textured yarn are
shown in Table 1. The
crimp property of the false twisted
textured yarn was lowered, as compared to that in Example 1, but
the false twisted textured yarn had more excellent crimp property
than that in Comparative Example.
[0141]
[Comparative Example 1]
Substantially the same procedure as in Example 1 was
conducted except that the throughput rate for the polymer was
changed, and that after applying an oil agent, drawing was not
conducted, obtaining a cheese-form package having wound 100
dtex/36 filaments (f). The
polymer throughput rate was
controlled to adjust the final fineness.
[0142]
Specifically, a solid multifilament having an oil agent
applied thereto was obtained by the same method as in Example 1,
and then the solid multifilament was wound round a roll heated
to 55 C at a circumferential speed of 2,510 m/minute, and then
36
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wound up at a winding speed of 2,500 m/minute without being
drawn, obtaining a cheese-form package.
[0143]
Physical properties of the obtained fiber are shown in
Table 1. The fiber had a birefringence as small as 0.047 and a
thermal stress maximum value as low as 0.05 cN/dtex. Further,
the fiber had a high warm water shrinkage rate and poor storage
stability.
[0144]
False-twist texturing was performed using the above-
obtained fiber, and draw false-twisting at a draw ratio of 1.3
times was conducted under the same conditions as those in Example
1 so that the obtained textured yarn had an elongation of 40%,
but yarn breaking frequently occurred in the draw false-twisting
step, so that a sample was not able to be obtained.
[0145]
[Comparative Example 2]
Substantially the same procedure as in Example 1 was
conducted except that after applying an oil agent, drawing was
not conducted, but the winding speed was increased to improve
the degree of orientation of the fiber, obtaining a cheese-form
package having wound 100 dtex/36 filaments (f). The
polymer
throughput rate was controlled to adjust the final fineness.
[0146]
Specifically, a solid multifilament having an oil agent
applied thereto was obtained by the same method as in Example 1,
and then the solid multifilament was wound round a roll heated
to 50 C at a circumferential speed of 3,010 m/minute, and then
wound up at a winding speed of 3,000 m/minute, obtaining a
cheese-form package.
[0147]
Physical properties of the obtained fiber are shown in
Table 1. The
fiber had a birefringence of 0.052, which was
improved as compared to 0.047 in Comparative Example 1, but had
a thermal stress maximum value as low as 0.06 cN/dtex. Further,
the fiber had a high hot water shrinkage rate and poor storage
stability.
[0148]
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False-twist texturing was performed using the above-
obtained fiber, and draw false-twisting at a draw ratio of 1.3
times was conducted under the same conditions as those in Example
1 so that the obtained textured yarn had an elongation of 40%.
Yarn breaking or the like did not occur and a sample was able to
be obtained, but was poor in crimp property.
[0149]
[Comparative Example 3]
Substantially the same procedure as in Example 1 was
conducted except that after applying an oil agent, drawing was
conducted at a high draw ratio, obtaining a cheese-form package
having wound 100 dtex/36 filaments (f).
[0150]
Specifically, a solid multifilament having an oil agent
applied thereto was obtained by the same method as in Example 1,
and then the solid multifilament was wound round a roll heated
to 55 C at a circumferential speed of 900 m/minute which is a
relatively low speed, and then drawn at a draw ratio as high as
3.1 times, and wound up at a winding speed of 2,800 m/minute,
obtaining a cheese-form package.
[0151]
Physical properties of the obtained fiber are shown in
Table 1. The fiber had a birefringence as high as 0.065, and
the maximum peak temperature of the thermal stress was 190 C and
the maximum peak of the thermal stress was as high as 0.20
cN/dtex. Further, the value of thermal stress in the temperature
range of 100 C or lower was low.
[0152]
Further, false-twist texturing was performed using the
above-obtained fiber, and draw false-twist texturing was
conducted under substantially the same conditions as those in
Example 1, except that the draw ratio was changed to 1.05 times,
so that the obtained textured yarn had an elongation of 40%.
Yarn breaking or the like did not occur and a sample was able to
be obtained, but was poor in crimp property.
[0153]
[Comparative Example 4]
Substantially the same procedure as in Example 1 was
conducted except that after applying an oil agent, drawing and
heat treatment were not conducted, but the winding speed was
38
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further increased, as compared to that in Comparative Example 2,
to improve the degree of orientation of the fiber, obtaining a
cheese-form package having wound 100 dtex/36 filaments (f).
[0154]
Specifically, a solid multifilament having an oil agent
applied thereto was obtained by the same method as in Example 1,
and then the solid multifilament was wound round a roll at a
circumferential speed of 5,650 m/minute, and then wound up at a
winding speed of 5,500 m/minute, obtaining a cheese-form package.
[0155]
Physical properties of the obtained fiber are shown in
Table 1. The fiber had a birefringence as high as 0.082, and
the specific gravity of the fiber polymer was as high as 1.332.
Further, the fiber had an elongation at break as low as 55% and
a high fineness variation value.
[0156]
False-twist texturing was performed using the above-
obtained fiber, and draw false-twist texturing was conducted
under substantially the same conditions as those in Example 1,
except that the draw ratio was changed to 1.1 times, so that the
obtained textured yarn had an elongation of 40%. Yarn breaking
or the like did not occur and a sample was able to be obtained,
but was poor in crimp property.
39
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[0157]
[Table 1]
Textured
Polymer Fiber
yarn
Temperature
in which Maximum
65 C hot
Glass maximum value
Intrinsic water Elongation
transitionSpecificBirefrin- value of of Modulus U%
Crimp
viscosity shrinkage at break
cN/dtex
hi%property
point gravity gence thermal thermal
dl/g rate %
C stress stress %
exists cN/dtex
C
Example 1 1.00 51 1.325 0.051 61 0.20 13 2.3 90
0.4 A
Example 2 1.00 51 1.324 0.052 61 0.17 8 1.7 95
0.5 A
Example 3 1.00 51 1.320 0.054 60 0.13 3 0.4 100
0.6 A
Example 4 1.30 52 1.322 0.064 63 0.30 20 2.6 90
0.5 A
Example 5 1.00 51 1.325 0.053 61 0.22 20 0.7 100
0.5 A
Example 6 1.00 51 1.327 0.053 63 0.13 10 2.5 85
0.5 A
Comparative
1.00 51 1.318 0.047 58 0.05 56 -0.3 105
0.6 B
Example 1
Comparative
1.00 51 1.319 0.052 60 0.06 50 0.0 100
0.6 B
Example 2
Comparative
1.00 51 1.337 0.065 190 0.20 3 3.3 50
0.9 B
Example 3
Comparative
1.00 51 1.332 0.082 67 0.25 2 3.1 55
0.9 B
Example 4
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[0158]
[Example 7]
Dimethyl terephthalate and 1,3-propanediol in a 1:2 molar
ratio were charged in the same manner as in Example 1, obtaining
a polymer which is comprised of trimethylene terephthalate
repeating units (100 mol%), and which has an intrinsic viscosity
of 1Ø
[0159]
The obtained polymer was dried by a general method so that
the water content became 50 ppm, and then molten at 265 C, and
extruded through a spinneret having 48 holes each having a
diameter of 0.27 mm formed in a single line.
[0160]
The extruded molten multifilament was quickly cooled by
applying thereto wind at a wind speed of 2.0 m/minute and changed
to a solid multifilament, and then, using a guide nozzle, an oil
agent containing 60% by weight of octyl stearate, 15% by weight
of polyoxyethylene alkyl ether, and 3% by weight of potassium
phosphate in the form of a water emulsion finishing agent having
a concentration of 10% by weight was applied to the solid
multifilament so that the amount of the oil agent applied became
0.6% by weight, based on the weight of the fiber.
[0161]
Then, the solid multifilament was wound round a roll heated
to 50 C at a circumferential speed of 2,300 m/minute, and then
wound round a roll heated to 80 C so as to be drawn at a draw
ratio of 1.2 times, and then, using a winder of a system that
drives both a spindle and a touch roll, the resultant
multifilament was wound up at a winding speed of 2,700 m/minute,
obtaining a cheese-form package having wound 73 dtex/48
filaments (f).
[0162]
Then, using the obtained yarn, a false twisted textured
yarn was produced in a disc false-twisting system at a draw ratio
of 1.3 times under the same conditions as those in Example 1.
Physical properties of the obtained textured yarn are shown in
Table 2.
[0163]
[Example 8]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
41
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polymer was extruded through a spinneret having 24 holes each
having a diameter of 0.27 mm formed in a single line, obtaining
a cheese-form package having wound 73 dtex/24 filaments (f).
[0164]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0165]
[Example 9]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
polymer was extruded through a spinneret having 62 holes each
having a diameter of 0.27 mm formed in a single line, obtaining
a cheese-form package having wound 56 dtex/62 filaments (f).
[0166]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0167]
[Example 10]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
polymer was extruded through a spinneret having 72 holes each
having a diameter of 0.20 mm formed in a single line, obtaining
a cheese-form package having wound 73 dtex/72 filaments (f).
[0168]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0169]
[Example 11]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
polymer was extruded through a spinneret having 24 holes formed
in a single line, wherein the spinneret has a cruciform cross-
sectional shape having a slit width of 0.6 mm and a length of
1.2 mm, obtaining a cheese-form package having wound 73 dtex/24
filaments (f). The
obtained yarn having an irregular shaped
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cross-section had an irregularity of 2.2.
[0170]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0171]
[Example 12]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
polymer was extruded through a spinneret having 24 holes formed
in a single line, wherein the spinneret has a triangular cross-
sectional shape in which a slit having a slit width of 0.06 mm
and a length of 0.5 mm extends from the center in three
directions at an angle of 120 C, obtaining a cheese-form package
having wound 73 dtex/24 filaments (f). The obtained yarn having
an irregular shaped cross-section had an irregularity of 1.6.
[0172]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0173]
[Example 13]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed, and the molten
polymer was extruded through a spinneret having 24 holes formed
in a single line, wherein the spinneret has a flattened cross-
sectional shape having a slit width of 0.14 mm and a length of
1.4 mm, obtaining a cheese-form package having wound 73 dtex/24
filaments (f). The
obtained yarn having a flattened cross-
section had a flatness of 3.4.
[0174]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 7,
obtaining a false twisted textured yarn. Physical properties of
the obtained textured yarn are shown in Table 2.
[0175]
[Comparative Example 5]
Substantially the same procedure as in Example 7 was
conducted except that after applying an oil agent, drawing was
43
Date Regue/Date Received 2024-04-17
CA 03236004 2024-04-17
not conducted, obtaining a cheese-form package having wound 73
dtex/48 filaments (f).
[0176]
Specifically, melt spinning was conducted under the same
conditions as those in Example 7, and the solid multifilament
was wound round a roll heated to 50 C at a circumferential speed
of 2,510 m/minute, and then wound up at a winding speed of 2,500
m/minute without being drawn, obtaining a cheese-form package.
[0177]
The temperature of the peak of the thermal stress of the
obtained fiber was 55 C, and the peak of the thermal stress was
0.08 cN/dtex.
Further, the fiber had a lowest modulus of 0
cN/dtex at an elongation of 10 to 30% of the fiber.
[0178]
Then, to obtain a textured yarn, the obtained fiber was
subjected to false-twist texturing under the same conditions as
those in Example 7, but a textured yarn was not able to be
obtained due to yarn breaking.
[0179]
[Comparative Example 6]
Substantially the same procedure as in Example 7 was
conducted except that the spinneret was changed from that in
Comparative Example 5, and the molten polymer was extruded
through a spinneret having 12 holes each having a diameter of
0.30 mm formed in a single line, obtaining a cheese-form package
having wound 108 dtex/12 filaments (f) (single fiber fineness:
9.0 dtex).
[0180]
The temperature of the peak of the thermal stress of the
obtained fiber was 55 C and the peak of the thermal stress was
0.08 cN/dtex. Further, the fiber had the lowest modulus of 0
cN/dtex at an elongation of 10 to 30% of the fiber.
[0181]
Then, the obtained fiber was subjected to false-twist
texturing under the same conditions as those in Example 1,
obtaining a false twisted textured yarn. The obtained false
twisted textured yarn had high crimp property, but had a large
single fiber fineness such that the hand feeling was hard.
Physical properties of the obtained textured yarn are shown in
Table 2.
[0182]
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[Comparative Example 7]
The spinneret was changed from that in Example 7, and the
molten polymer was extruded through a spinneret having 36 holes
each having a diameter of 0.30 mm formed in a single line. Then,
the resultant multifilament was wound round a roll heated to
50 C at a circumferential speed of 1,500 m/minute, and then drawn
at a draw ratio of 2.0 times, and then wound round a roll heated
to 130 C, and then, using a winder of a system that drives both
a spindle and a touch roll, the resultant multifilament was wound
up at a winding speed of 2,900 m/minute under the conditions at
a draw ratio of about 2 times, obtaining a cheese-form package
having wound 95 dtex/36 filaments (f).
[0183]
The temperature of the peak of the thermal stress of the
obtained fiber was 190 C and the peak of the thermal stress was
0.20 cN/dtex. Further, the value of the thermal stress in the
temperature range of 100 C or lower was low.
Further, the fiber had a lowest modulus of 3.3 cN/dtex at
an elongation of 10 to 30% of the fiber.
[0184]
Both the crystallinity and the degree of orientation had
proceeded due to heat drawing, and hence false-twisting could
not be made using the disc false-twisting system in Example 7.
Therefore, false-twist texturing was conducted under the below-
shown conditions for false-twisting, obtaining a false twisted
textured yarn. In this instance, the texturing rate was as low
as 100 m/minute, as compared to the texturing rate of 600
m/minute in Example 7.
Physical properties of the obtained
textured yarn are shown in Table 2.
= Conditions for false-twisting
Type of false twister: LS-2, manufactured by Mitsubishi
Heavy Industries, Ltd. (pin false-twisting system)
Number of revolutions of spindle: 27,500 rpm
Number of false twists: 3,840 T/m
First feed ratio: 0%
First heater temperature (contact type): 160 C
Second heater temperature (non-contact type): 150 C
Second feed ratio: +15%
Date Regue/Date Received 2024-04-17
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[0185]
[Table 2]
Polymer Fiber Textured yarn
Temperature
in which Maximum
Yarn
maximum value Single Maximum Maximum
breaking
Intrinsic Cross- Total Breaking Elongation U%
value of of Modulus fiber crimp
crimp during
viscosity sectional fineness strength at break (Normal)
thermal thermalcN/dtexfineness
elongation stress false-
dl/g shape dtex cN/dtex % %
stress stress dtex %
cN/dtex twist
exists cN/dtex
texturing
C
Example 7 1.0 Circular 62 0.24 2.1 1.2 56 3.0 35
1.2 170 0.030 No
Example 8 1.0 Circular 61 0.20 1.6 2.3 56 3.2 30
1.0 200 0.030 No
Example 9 1.0 Circular 61 0.17 1.4 0.7 43 3.3 26
1.5 160 0.022 No
Example 10 1.3 Circular 64 0.30 2.5 0.8 56 3.2
32 1.2 170 0.021 No
Example 11 1.0 Cruciform 65 0.15 2.0 2.3 56 2.8
32 1.5 180 0.022 No
Example 12 1.0 Triangular 61 0.17 1.4 2.3 56
3.0 30 1.5 160 0.030 No
Example 13 1.0 Flat 61 0.18 1.8 2.3 56 2.7 31
1.5 160 0.021 No
Comparative
1.0 Circular 55 0.08 0 - - - - -
- - Yes
Example 5
-comparative
1.0 Circular 55 0.08 0 6.9 83 3.1 31
1.1 170 0.028 No
Example 6
Comparative
1.0 Circular 190 0.20 3.3 3.0 109 3.1 26
1.2 163 0.017 No
Example 7
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Industrial Applicability
[0186]
By the present invention, there can be achieved a
polytrimethylene terephthalate fiber having a resistance to the
process tension upon being textured and having high elongation,
and a method for producing the same.
Further, there can be
obtained a polytrimethylene terephthalate textured yarn which is
advantageous not only in that yarn breaking is unlikely to occur
during texturing, but also in that the yarn has high crimp
property, and the invention is of extremely great commercial
significance.
Reference Signs List
[0187]
R: Minimum circumcircle radius
r: Maximum inscribed circle radius
L: Long side of the circumscribing rectangle
H: Short side of the circumscribing rectangle
47
Date Regue/Date Received 2024-04-17
