Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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DESCRIPTION
TITLE OF THE INVENTION
HOLLOW POLYESTER LONG FIBER AND PREPARATION METHOD THEREFOR
TECHNICAL FIELD
The present invention relates to a hollow polyester long fiber of hollow
crimped
shape and a preparation method thereof, and the hollow long fiber is suitable
for making long
fiberfill.
,
BACKGROUND ART
In the textile industry, feathers and downs of waterfowls, such as goose down,
duck
down, etc., are usually filled in duvets, sleeping bags and various cold-proof
and warmth
retention products. Bird flu that has occurred worldwide has led to a sharp
decline in the
production of down, which has caused prices to rise. At the same time,
consumers also have
doubts about the safety of down. If the natural feathers are not adequately
washed, it will
cause bad odor. Therefore, it is necessary to remove the odor-causing dirt in
advance and
maintain the cleanliness of the feathers. Moreover, there are still problems
in washing feather
filling products, such as feather bedding, feather jackets and the like.
To this end, the industry is committed to the use of synthetic fibers instead
of
animal downs for filling. Chinese patent CN186187A discloses a short-fiber
type of down-
like fiberfill, but the short-fiber fiberfill has low fluffmess, and a heat
insulating material
produced therefrom has a grainy feel when touched, while the short-fiber type
down-like
fiberfill is prone to shifting when washed. Therefore, there is an urgent need
to develop a new
type of filling material instead of down. Polyester fiber is easy to produce
and has the
advantage of low price. The development of polyester-based filling materials
has a good
market prospect.
SUMMARY OF INVENTION
It is an object of the present invention to provide a hollow polyester long
fiber
having a three-dimensionally crimped shape, which is suitable for use in the
production of
long fiberfill, and a method for preparing the hollow polyester long fiber.
The hollow polyester long fiber of the present invention has a cross-sectional
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hollowness ranging from 20.0% to 45.0%, and the hollow polyester long fiber
has a three-
dimensionally crimped shape in a natural state, and the crimped shape has a
radius of
curvature ranging from 10.0 mm to 50.0 mm.
The hollow polyester long fiber of the present invention preferably has a
monofilament fineness ranging from 4.0 dtex to 15.0 dtex, and more preferably
from 5.0 dtex
to 10.0 dtex.
The hollow polyester long fiber of the present invention still has a three-
dimensionally crimped shape after dry heat treatment at 160 C for 3 minutes,
and has a radius
of curvature in a crimped state ranging from 3.5 mm to 10.0 mm.
The hollow polyester long fiber of the present invention has a polymer raw
material
selected from the group consisting of polyethylene terephthalate,
polytrimethylene
terephthalate, polybutylene terephthalate or a modified polymer thereof.
The present invention also discloses a method for preparing the above-
mentioned
hollow polyester long fiber, wherein a dried chip is melt-extruded by a screw
and then
conveyed to a metering pump through a pipe, the polymer accurately measured by
the
metering pump is conveyed to a spinning pack, a spinneret of the spinning pack
is a hollow
spinneret with a cooling distance ranging from 10 to 150 mm, and a wind speed
of side
blowing ranges from 25 to 90 m/min.
The cooling distance preferably ranges from 60 to 110 mm; and the wind speed
of
the side blowing ranges from 30 to 50 m/min.
The hollow polyester long fiber of the present invention is obtained by a melt
spinning process, has the advantages of simple production and low cost, and
has a three-
dimensional crimped structure, and is suitable for processing into a fluffy
processed tow
which can be used as long fiberfill.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a view showing a triangular hollow cross-sectional shape of a hollow
polyester long fiber.
FIG. 2 is a view showing a quadrangular hollow cross-sectional shape of a
hollow
polyester long fiber.
FIG. 3 is a view showing a three-dimensionally crimped shape of a hollow
polyester
long fiber in a natural state.
FIG. 4 is a schematic view showing a measurement of a radius of curvature.
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DESCRIPTION OF EMBODIMENTS
In order to develop a filler that can replace down, the present invention
provides a
hollow polyester long fiber suitable for processing into a fluffy processed
tow. Since the
hollow fiber has a structural feature of three-dimensionally crimped shape,
the obtained fluffy
processed tow also has a three-dimensional structure, so that the bulk of the
fluffy tow is
large, and a fluffy processed tow excellent in fluffiness can be obtained. In
the fiber-forming
polymers, the Young's modulus of the polyester fiber is relatively high, so
that the obtained
fluffy processed tow has good pressure resistance and recovery.
The three-dimensionally crimped shape means that the fiber exhibits an
irregular
spiral structure in the long direction (FIG. 3), and at the same time, due to
the difference in
alignment between a part of the monofilaments, the rotation mode and direction
of the
monofilaments are different so as to form a multi-dimensional stereoscopic
form.
The hollow polyester long fiber of the present invention is a hollow fiber
produced
by melt spinning technique. The molten polyester chips are discharged through
a profiled
hollow spinneret and then coiled after side blow cooling to obtain the hollow
polyester long
fiber. In the process of melt spinning, the hollow fiber is controlled to have
a hollowness
ranging from 20.0% to 45.0% and a radius of curvature of the three-
dimensionally crimped
shape ranging from 10.0 mm to 50.0 mm by adjusting the position of the side
blowing to
change the cooling distance, adjusting the wind speed of the side blowing, and
the spinning
speed. Compared with a solid fiber with the same fiber diameter, the fluffy
processed filament
obtained by using the hollow fiber has a higher fluffiness, and the higher the
hollowness is,
the more obvious the light weight is. If the radius of curvature of the hollow
fiber is too small,
the cohesion between the filaments of the fiber is high, the fiber is not easy
to be split during
the processing of the fluffy tow, and the diameter of the ring formed by the
fiber is small,
which affects the fluffiness of the processed tow. On the other hand, if the
crimp radius of the
fiber is too large, the diameter of the ring formed by the fiber after being
processed into a
fluffy processed tow is too large, which may weaken or fail to reflect the
original three-
dimensional effect of the sheath fiber, and also affect the fluffmess of the
processed tow.
According to the differences in the shape and arrangement of the hollow
spinneret
discharge holes, and the change of the production process, the obtained hollow
fiber has a
slightly different cross-section, and the hollow portion has a circular shape,
an approximately
triangular shape, an approximately square shape, an approximately pentagon
shape, and the
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like. At the same time, the number of holes in the hollow section is not
limited to one hole.
The monofilament fineness of the hollow polyester long fibers of the present
invention is preferably in a range from 4.0 dtex to 15.0 dtex. As the raw
material fiber for the
fluffy processed tow, the higher the monofilament fineness of the fiber is,
the better the
.. rigidity of the fiber is, and meanwhile the better the fluff-mess of the
resulting fluffy tow is,
and the better the pressure resistance and the recovery property are. However,
if the diameter
of the monofilament fiber is too large, it is not easy to be cooled during
spinning, and the
uniformity of the fiber is lowered, and the obtained fluffy tow has a hard
hand feeling.
Therefore, it is more preferable that the monofilament fineness of the hollow
polyester long
fiber is in a range from 5.0 dtex to 10.0 dtex.
The raw materials of the hollow polyester long fibers of the present invention
are
mainly common polyesters such as polyethylene terephthalate, polytrimethylene
terephthalate
or polybutylene terephthalate. In order to impart a special function to the
fluffy processed
yarn, a modified copolymer of the above polymer, such as an antibacterial and
anti-mite
.. modified polymer, can also be used, and the same effect as the common
polyester can be
achieved in terms of fluffiness properties.
The hollow polyester long fiber is one of the raw materials for making fluffy
processed tows for filling. The hollow polyester long fiber can be directly
used as long
fiberfill by directly combining N fibers into a fluffy processed tow, and can
also be used in
.. combination with other raw materials, such as a fiber which is slightly
lower in melting point
to be made into a blended fiber, and then used as long fiberfill.
Alternatively, the blended fiber
and the hollow polyester long fiber are subjected to core-sheathing and then
partially melted
to obtain a more excellent fluffy processed tow, which is then used as long
fiberfill.
The hollow polyester long fiber of the present invention still has a three-
.. dimensional shape after dry heat treatment at 160 C for 3 minutes. The
crimped shape
changes due to the thermal shrinkage of the fiber, and the radius of curvature
is preferably in a
range from 3.5 mm to 10.0 mm. In this case, even after the subsequent
processing, the hollow
polyester long fiber can maintain a fluffy three-dimensionally crimped shape,
and is excellent
in hand feeling, fluffiness, heat retention and the like.
The long-fiber hollow polyester long fiber of the present invention can be
prepared
by the following method, but is not limited to the method:
First, the raw material polyester chips are dried to reduce the water content
of the
polyester chips, improve the spinnability, and control the water content of
the chips to be 50
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ppm or less. The dried chips are spun by a general melt spinning method. The
chips are
melted by a screw or a hot plate and then conveyed to a metering pump through
a pipe, and
the melt polymer is accurately metered by the metering pump and then enters
the spinning
pack, wherein the spinneret used in the spinning pack is a spinneret dedicated
to hollow fiber
5 spinning. The polymer discharged from the spinneret is cooled, oiled and
then coiled. In order
to obtain a slightly crimped hollow fiber, the requirement for the cooling
distance (the
distance from the lower edge of the spinneret to the upper edge of the side-
blowing for
cooling) in the spinning process is relatively strict, and it is generally
controlled within a
range from 10 to 150 mm, preferably within a range from 60 to 100 mm. At the
same time, in
order to produce the difference between the structures on both sides of the
hollow fiber, there
is also limitation for the wind speed of the side blowing. According to the
fiber type (total
fineness and number of filaments), it is generally controlled within a range
from 25 to 90
m/min, preferably from 30 to 50 m/min.
When the cooling distance is less than 10 mm, the polymer discharged from the
spinneret is rapidly cooled, the asymmetric effect is obvious, the radius of
curvature of the
obtained fiber is too small, the cohesion between the fiber monofilaments is
high, and the
fluffing effect is affected, and at the same time the temperature of the
spinneret is easily
lowered to cause fiber breakage and thus the spinnability is not good. When
the cooling
distance is greater than 150 mm, the polymer discharged from the spinneret has
been
uniformly cooled to a certain extent. Even if forced cooling is then performed
by the side
blowing, the asymmetric effect is weakened, and the radius of curvature of the
fiber is too
large, which also affects the fluffmg effect.
When the wind speed of the side blowing is less than 25 m/min, the asymmetric
cooling effect is not obvious, and the radius of curvature of the fiber is too
large. When the
wind speed of the side blowing is greater than 90 m/min, the asymmetric effect
is obvious,
resulting in the curvature radius of the obtained fiber being too small, and
excessive side
blowing results in a large swing of the fiber, unstable spinning, and easy to
appear floating
monofilament and broken filament.
In order to prevent physical properties from differing between the filaments
due to
the difference in cooling, the arrangement of the spinneret discharge holes is
preferably a
"houndstooth" arrangement, which is often referred to as a diamond
arrangement. Preferably,
the spinning process mainly adopts a one-step spinning process, that is,
spinning/stretching is
completed simultaneously, that is, commonly known as FDY. However, it can also
be
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obtained by a two-step process, that is, a pre-oriented fiber is first
obtained, which is
commonly known as POY, and then subjected to a drawing process by an extension
machine,
which is commonly known as DT.
The hollow polyester long fiber of the present invention has a three-
dimensional
crimped structure, and at the same time, the fiber monofilament is relatively
thick, and the
fluffy processed tow obtained from the hollow long fiber has a high excluded
volume, and has
high fluffiness while having excellent compression resistance.
The test method involved in the present invention is as follows:
(1) Test method for total fineness and monofilament fineness
The total fineness test was performed according to the TIS L 1013:2010
standard,
and the monofilament fineness was calculated by the total fineness and the
number of
filaments.
(2) Hollow rate
The hollow long fiber was cut into thin slices (i.e., fiber cross-section) in
the
longitudinal direction, which were then photographed under a normal optical
microscope to a
suitable magnification, and the area Si of the hollow portion and the area S2
of the entire fiber
(including the hollow portion) were calculated according to the photograph,
then it was
calculated as:
Hollow ratio = (Si/S2) x 100%.
(3) Test method for radius of curvature
Radius of curvature in a natural state: the yarn was passed through a scaler
(for
fineness measurement) to crimp the sample for 10 turns (1 mit-urn), and then
the sample to be
tested was placed (suspended) for 8 hours or more in a constant temperature
and humidity
environment (20 C x 65% RH) to stabilized its state (FIG. 3), then the crimped
part within 20
cm below the sample was selected to measure the radius, and 20 different
places were
selected for measurement and averaged, and the obtained data was the radius of
curvature.
The measuring instrument was a digital microscopy system (VHX-2000C)
manufactured by
KEYENCE. The magnification was 20 times, and the radius of curvature was
measured by
the calculation function of the radius of curvature in the software (FIG. 4).
That is, the radius
of curvature of the fibers was measured by three locations on the crimped
fiber.
Curvature radius after dry heat treatment: the yarn was passed through a
scaler (for
fineness measurement) to crimp the sample for 10 turns, and then placed in a
dryer for heat
treatment. The treatment condition was 160 C x 3 min, and then the sample was
placed in a
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constant temperature and humidity environment for 4 hours or more, and finally
the crimped
part within 20 cm of the lower portion was selected to measure the radius, and
20 different
places were selected for measurement and averaged, and the obtained data was
the radius of
curvature.
(4) Fluff-mess
Test according to the IDFB method:
(i) Firstly, the sample to be tested was placed in an environment of 20 C x
65% RH
for 8 hours or more, so that the sample to be tested was stabilized;
(ii) 30g of sample were weighted, manually shaken to a fluffy state, placed in
a
measuring barrel and covered with a lid;
(iii) the weight plate was moved down to the highest point of contact with the
sample, then the weight plate was released to make it fall freely, and it was
started to measure
time at the time of releasing the weight plate, and after 1 minute for
stabilization, the height
was read and recorded;
(iv) the lid was open to take out the sample, which was shaken again to the
fluffy
state, placed in the measuring barrel and covered with the lid, and measured
again according
to step (iii), and the same method was repeatedly tested for 5 times;
(v) the fluffiness was calculated by calculating the average height of the 5
times of
tests.
The contents of the present invention are explained below by way of examples,
but
the present invention is not limited to the contents listed in the examples.
Example 1:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 25 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 300T-20f, a triangular hollow cross-
section, a hollowness
of 20.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of
50.0 mm before
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heat treatment, and a radius of curvature of 10.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 390 inch3/30 g. See Table 1 for details.
Example 2:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 40 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 150T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of
42.0 mm before
heat treatment, and a radius of curvature of 8.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed =
tow was tested to be 600 inch3/30 g. See Table 1 for details.
Example 3:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 40 m/min, and the hollow polyester
fiber was
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obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 60T-4f, a triangular hollow cross-
section, a hollowness
of 45.0%, a monofilament fineness of 15.0 dtex, and a radius of curvature of
37.0 mm before
heat treatment, and a radius of curvature of 7.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 800 inch3/30 g. See Table 1 for details.
Example 4:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
40.0 mm before
heat treatment, and a radius of curvature of 7.8 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 650 inch3/30 g. See Table 1 for details.
Example 5:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
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polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 50 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
5 fiber were as follows: a fiber type of 100T-20f, a triangular hollow
cross-section, a hollowness
of 30.0%, a monofilament fineness of 5.0 dtex, and a radius of curvature of
35.0 mm before
heat treatment, and a radius of curvature of 6.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
10 of 20 times, processed into core-sheath type fluffy filaments, and every
6 filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 610 inch3/30 g. See Table 1 for details.
Example 6:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 75 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 60T-15f, a triangular hollow cross-
section, a hollowness
of 45.0%, a monofilament fineness of 4.0 dtex, and a radius of curvature of
10.0 mm before
heat treatment, and a radius of curvature of 3.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
.. tow was tested to be 480 inch3/30 g. See Table 1 for details.
Example 7:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
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(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 70 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 65T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 6.5 dtex, and a radius of curvature of
30.0 mm before
heat treatment, and a radius of curvature of 6.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 580 inch3/30 g. See Table 1 for details.
Example 8:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 70 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 50T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 5.0 dtex, and a radius of curvature of
20.0 mm before
heat treatment, and a radius of curvature of 4.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 520 inch3/30 g. See Table 1 for details.
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Example 9:
As a raw material, semi-dull polyester chips (T200N manufactured by bray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
.. dehumidifying dryer to have a water content of 39 ppm after drying. The
dried chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 25 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 60T-4f, a quadrangular hollow cross-
section, a
hollowness of 45.0%, a monofilament fineness of 15.0 dtex, and a radius of
curvature of 42.0
mm before heat treatment, and a radius of curvature of 8.1 mm after dry heat
treatment at
160 C for 3 minutes. The fiber was selected as the raw material for the sheath
fiber and the
core fiber and was fed by overfeeding at a ratio of sheath filament feeding
speed/core filament
feeding speed of 20 times, processed into core-sheath type fluffy filaments,
and every 6
filaments were combined into one to obtain a fluffy processed tow, and the
fluffiness of the
fluffy processed tow was tested to be 760 inch3/30 g. See Table 1 for details.
Example 10:
As a raw material, conventional polytrimethylene terephthalate chips (i.e.,
common
3GT) were used, and the polytrimethylene terephthalate was dried by a pre-
crystallization
dehumidifying dryer to have a water content of 30 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
38.0 mm before
heat treatment, and a radius of curvature of 7.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
CA 03047479 2019-06-13
13
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 630 inch3/30 g. See Table 1 for details.
Example 11:
As a raw material, conventional polybutylene terephthalate chips (i.e., common
PBT) were used, and the polybutylene terephthalate was dried by a pre-
crystallization
dehumidifying dryer to have a water content of 33 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
36.0 mm before
heat treatment, and a radius of curvature of 7.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 600 inch3/30 g. See Table 2 for details.
Example 12:
As a raw material, cationic modified polyethylene terephthalate chips were
used,
and the cationic modified polyethylene terephthalate was dried by a pre-
crystallization
dehumidifying dryer to have a water content of 30 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 33.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
33.0 mm before
CA 03047479 2019-06-13
14
heat treatment, and a radius of curvature of 6.4 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 610 inch3/30 g. See Table 2 for details.
Example 13:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 10
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 40.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
12.0 mm before
heat treatment, and a radius of curvature of 3.6 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 490 inch3/30 g. See Table 2 for details.
Example 14:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 60
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
CA 03047479 2019-06-13
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 37.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
30.0 mm before
heat treatment, and a radius of curvature of 6.1 mm after dry heat treatment
at 160 C for 3
5 minutes. The fiber was selected as the raw material for the sheath fiber
and the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 600 inch3/30 g. See Table 2 for details.
Example 15:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 90
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 32.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
34.0 mm before
heat treatment, and a radius of curvature of 9.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 720 inch3/30 g. See Table 2 for details.
Example 16:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
CA 03047479 2019-06-13
16
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 110
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 30.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
38.0 mm before
heat treatment, and a radius of curvature of 12.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 620 inch3/30 g. See Table 2 for details.
Example 17:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 150
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 25.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
44.0 mm before
heat treatment, and a radius of curvature of 14.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 550 inch3/30 g. See Table 2 for details.
Example 18:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
CA 03047479 2019-06-13
17
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 90 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 35.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
18.0 mm before
heat treatment, and a radius of curvature of 3.9 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 510 inch3/30 g. See Table 2 for details.
Example 19:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 50 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 28.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
28.0 mm before
heat treatment, and a radius of curvature of 4.5 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 530 inch3/30 g. See Table 2 for details.
CA 03047479 2019-06-13
18
Comparative example 1:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a common round hole spinneret with a
cooling distance of
65 mm. The wind speed of the side blowing was 25 m/min, and the polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the fiber were
as follows: a fiber type of 56T-24f, a solid circular cross-section, a
monofilament fineness of
2.3 dtex, and no crimping property before and after heat treatment. The fiber
was selected as
the raw material for the sheath fiber and the core fiber and was fed by
overfeeding at a ratio of
sheath filament feeding speed/core filament feeding speed of 20 times,
processed into core-
sheath type fluffy filaments, and every 6 filaments were combined into one to
obtain a fluffy
processed tow, and the fluffiness of the fluffy processed tow was tested to be
240 inch3/30 g.
See Table 3 for details.
Since the cross-section of the fiber was solid, the obtained fiber did not
have curl,
had a small fluffiness, and was not suitable for use as fiberfill instead of
feather.
Comparative example 2:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 90
mm. The wind speed of the side blowing was 35 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 10.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
40.0 mm before
heat treatment, and a radius of curvature of 10.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
CA 03047479 2019-06-13
19
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 310 inch3/30 g. See Table 3 for details.
Since the hollowness of the fiber was too small, although it had a radius of
curvature, it was not light in weight and had a small fluffiness, and was not
suitable for use as
fiberfill instead of feather.
Comparative example 3:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 5
mm. The wind speed of the side blowing was 35 muffin, and spinning was
performed through
the DSD high-speed spinning process. Since the cooling distance was too short,
although the
spinning could be performed, the phenomenon of broken filaments and floating
filaments was
serious, and the feasibility of production was low. See Table 3 for details.
Comparative example 4:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 110 m/min, and spinning was
performed
through the DSD high-speed spinning process. Since the wind speed of the side
blowing was
too fast, although the spinning could be performed, serious fiber vibration
led to serious
broken filaments and floating filaments, and the feasibility of production was
low. See Table 3
for details.
CA 03047479 2019-06-13
Comparative example 5:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
5 melted and extruded by a screw and conveyed to a metering pump through a
pipe. The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 200
mm. The wind speed of the side blowing was 70 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
10 fiber were as follows: a fiber type of 100T-10f, a triangular hollow
cross-section, a hollowness
of 15.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
65.0 mm before
heat treatment, and a radius of curvature of 23.0 mm after dry heat treatment
at 160 C for 3
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
15 of 20 times, processed into core-sheath type fluffy filaments, and every
6 filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 350 inch3/30 g. See Table 3 for details.
Since the cooling distance was too large, the radius of curvature of the
obtained
fiber was too large to reflect the three-dimensional effect of the fiber,
resulting in small
20 fluffiness.
Comparative example 6:
As a raw material, semi-dull polyester chips (T200N manufactured by Toray
Fibers
(Nantong) Co., Ltd.) were used, and the polyester chips were dried by a pre-
crystallization
dehumidifying dryer to have a water content of 39 ppm after drying. The dried
chips were
melted and extruded by a screw and conveyed to a metering pump through a pipe.
The
polymer accurately metered by the metering pump was conveyed to the spinning
pack. The
spinneret of the spinning pack was a hollow special spinneret with a cooling
distance of 65
mm. The wind speed of the side blowing was 20 m/min, and the hollow polyester
fiber was
obtained through the DSD high-speed spinning process. The characteristics of
the hollow
fiber were as follows: a fiber type of 100T-10f, a triangular hollow cross-
section, a hollowness
of 12.0%, a monofilament fineness of 10.0 dtex, and a radius of curvature of
55.0 mm before
heat treatment, and a radius of curvature of 20.0 mm after dry heat treatment
at 160 C for 3
CA 03047479 2019-06-13
21
minutes. The fiber was selected as the raw material for the sheath fiber and
the core fiber and
was fed by overfeeding at a ratio of sheath filament feeding speed/core
filament feeding speed
of 20 times, processed into core-sheath type fluffy filaments, and every 6
filaments were
combined into one to obtain a fluffy processed tow, and the fluffiness of the
fluffy processed
tow was tested to be 350 inch3/30 g. See Table 3 for details.
Since the wind speed of the side blowing was too small, the radius of
curvature of
the obtained fiber was too large to reflect the three-dimensional effect of
the fiber, resulting in
small fluffiness.
'
22
Table 1
Item Example 1 Example 2 Example 3 Example 4 Example 5
Example 6 Example 7 Example 8 Example 9 Example 10
Common Common Common Common Common Common Common Common Common Common
Polymer
PET PET PET PET PET PET PET
PET 3GT 3GT
Main Spinneret form Hollow Hollow Hollow Hollow
Hollow Hollow Hollow Hollow Hollow Hollow
process of
spinning Cooling distance (mm) 65 65 65 65 65 65
65 65 65 65
wind speed of side blowing 25
40 40 35 50 75 70
70 25 35
(m/min)
Cross-section form Hollow Hollow Hollow Hollow Hollow
Hollow Hollow Hollow Hollow Hollow
Shape of hollow part Triangular Triangular Triangular Triangular
Triangular Triangular Triangular Quadrangular Triangular Triangular
Fiber variety 300T-20f 150T-10f 60T-4f 100T-10f 100-
20f 60T-15f 65T-10f 50T-10f 60T-4f 100T-10f - P
0
0
Fiber Hollowness (%) 20.0 30.0 45.0 30.0 30.0 45.0
30.0 30.0 45.0 30.0 .
..,
properties
. ...] -
Monofilament fineness
.
15.0 15.0 15.0 10.0 5.0 4.0 6.5
5.0 15.0 10.0
(dtex)
,
,
Radius of curvature (mm) 50.0 42.0 37.0 40.0 35.0 10.0
30.0 20.0 42.0 38.0 ,
,
Radius of curvature after
10.0 8.5 7.0 7.8 6.5 3.5 6.0
4.5 8.1 7.5
heat treatment (mm)
Fluffiness of fluffy processed tow
390 600 800 650 610 480 580
520 760 630
(inch3/30g)
23
Table 2
Item Example 11 Example 12 Example 13 Example 14 Example
15 Example 16 Example 17 Example 18 Example 19
Common Cationic Common Common Common Common Common Common Common
Polymer
PBT PET PET PET PET PET
PET PET PET
Main Spinneret form Hollow Hollow Hollow Hollow
Hollow Hollow Hollow Hollow Hollow
process of
spinning Cooling distance (mm) 65 65 10 60 90
110 150 65 65
wind speed of side blowing 35
35 35 35 35 35
35 90 50
(m/min)
Cross-section form Hollow Hollow Hollow Hollow Hollow
Hollow Hollow Hollow Hollow
Shape of hollow part Triangular Triangular Triangular Triangular
Triangular Triangular Triangular Triangular Triangular
Fiber variety 100T-10f 100T-10f 100T-10f 100T-10f
100T-10f 100T-10f 100T-10f 100T-10f 100T-10f P
0
,..
0
Fiber Hollowness (%) 30.0 33.0 40.0 37.0 32.0 30.0
25.0 35.0 28.0 .
,
properties
...] -
Monofilament fineness
.
10.0 10.0 10.0 10.0 10.0 10.0
10.0 10.0 10.0
(dtex)
,
,
Radius of curvature (mm) 36.0 33.0 12.0 30.0 34.0 38.0
44.0 18.0 28.0 ,
,
Radius of curvature after
,..
7.0 6.4 3.6 6.1 9.5 12.5
14.5 3.9 4.5
heat treatment (mm)
Fluffiness of fluffy processed tow
600 610 490 600 720 620
550 510 530
(inch3/30g)
'
CA 03047479 2019-06-13
24
Table 3
Comparative Comparative Comparative Comparative Comparative Comparative
Item
example 1 example 2 example 3 example 4 example 5 example 6
Common Common Common Common Common Common
q... Polymer
o PET PET PET PET PET PET
n b,
O c Spinneret form Circular Hollow Hollow
Hollow Hollow Hollow
sn,2 .E Cooling distance
a 65 90 5 65 200 65
(mm)
wind speed of side
35 35 35 110 70 20
blowing (m/min)
Cross-section form Solid Hollow Hollow Hollow
Shape of hollow
¨ Triangular Triangular
Triangular
part
. Fiber variety 56T-24f 100-10f 100T-10f
100T-10f
0.)
1 Hollowness (%) ¨ 10.0 15.0 12.0
o
0- Monofilament
2.3 10.0 10.0 10.0
_25; fineness (dtex) ¨
i=Z Radius of curvature
40.0 65.0 55.0
(mm)
Radius of curvature
after heat treatment 10.0 23.0 20.0
(mm)
Fluff-mess of fluffy
processed tow 240 310 350 350
(inch3/30g)
