Note: Descriptions are shown in the official language in which they were submitted.
X135827
.,
A TRANSFER ROLL COATING COLOR AND A COATED PAPER
Field of the Invention
The present invention relates to the transfer roll
coating color and the quality of coated paper. In more
detail, the present invention relates tora transfer roll
coating color comprising a novel composition as well as
having high solid content and low viscosity and by which
coating may be carried out during operation time without
affecting the advantages of transfer roll coating,
particularly a stable runnability at high speed machine
coating, and furthermore relates to high coat weight as
well as an excellent gloss, smoothness and printability
comparable to those obtained by a blade coating.
Background of the Invention
Paints used in conventional transfer roll coatings in
which pigments and adhesives are.the main components are
highly viscous similar to other coating colors, and
characterized in that coat weights are generally low. As the
pigment there may be used inorganic pigments such as
kaolin, clay, precipitated calcium carbonate, ground calcium
carbonate, titanium oxide, aluminium hydroxide, satine
white, barium sulfate, magnesium oxide, talc and colloidal
silica, as well as organic pigments such as plastic
pigments and white urea resin pigments, which are generally
used in admixture of two kinds or more. As adhesives, there
may be mentioned water-soluble polymer such as casein,
r .;, ,: , 1 .' r , ,
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2i3582'~
oxidized starch, phosphoric esterized starch, soybean
protein and carboxymethyl cellulose, as well as synthetic
rubber latex such as so-called SBR type, MBR type or MSBR
type and acrylic latex, which are used in an amount of 10
50 weight ~ of the water-soluble macromolecule and 10~ 30
weight ~ of the latex based on 100 weight ~ of the pigment
and are generally used in admixture thereof. Furthermore,
additives such as an anti-foaming agent, a dispersant, a
water-proofing agent, a preservative, a coloring agent and a
lubricant may be added, if required, to prepare a color.
A solid content of the thus obtained transfer roll
coati ng color is ~.0 ~.55 weight ~o, and a ratio between the
pigment and the adhesive (a binder ratio) is such that the
adhesive is 30~r50 weight ~ to the pigment, which means that
the amount of the adhesive is considarably high.
Furthermore, a starch adhesive and latex are used together
in many cases in the adhesive, and it is characterized that
the ratio of the starch adhesive is as high as 20-~.50
weight ~ to the pigment. The starch adhesives generally
used have a viscosity of at least 3,000 cps, generally
10,000 cps or higher, determined at a solid content of 30
weight ~, a temperature of 50 '~ and 60rpm by means of a
No.4 rotor of a BrookfieldTT" viscosimeter. In addition, a ..
coated amount on one side is less than 5 g/m2, particularly
less than 3~g/mz, for an effective coating, also being a
characteristic thereof.
The transfer roll coating is thus known as suitable for
_'' . " ~ , :: Z : ~ : ~ .:. ' ,:,: :1' ,,.:., .'.
2135827
a coating of a sizing liquid since a quite light weight
coating is possible, and furthermore has many advantages
such as (1) the device may be compact, (2) the coating may
be carried out with wide webs, (3) on machine coating, (~t)
with less paper break, and (5) a continuous operation is
possible for several days, (6) a coating on both sides is
easily achived, as well as (~) the difference between a
surface and a back of a product being small. On the
contrary, however, there are also some disadvantages such
as (1) a feeling of a coated surface being inferior to that
obtined by a blade coating,(2) characteristics of a color
being limited, and (3) maintenance of rolls being necessary.
The coated surface obtained by the transfer roll
coating has a specific stripy coating pattern, and may not
give an even, smooth and glossy coated surface obtained in
the case of the blade coating. The stripy pattern can be
improved by increasing the coat weight, but a split pattern
such as Orange peal or aventurine appearence may then
appear and excellent printability cannot be obtained when
the transfer roll coated paper is printed. Eor these
reasons, in spite of having many advantages described above,
the transfer roll coating has been used only for a sizing
liquid coating or a light weight coating wherein a high _,
coated amount is not necessary or for preparation of a low-
grade coated paper wherein printability is not critical.
There has recently been a tendency for grade-up over
all coated papers, and for example in art papers the so-
. ; . 3; ,, , . ,'~ ..'; .
zi~~s27
called super art papers with more glossy and superior
printability have been appeared and additionally higher
opacity, stiffness and gloss are required even in the
customary grades such as superlight weight coated papers.
This tendency is similar in the low-grade coated papers. Eor
improvement in smoothness and gloss of the coated paper, a
super calender or a machine calender has hitherto been used,
and means such as increase in a calender pressure and a
temperature are used to obtaine the more glossy coated
papers. However, if these means are applied for the transfer
roll coated paper, gloss may be improved somewhat, but
calipers become short, as well as qualities such as opacity,
whiteness, stiffness and ink acceptability are lowered, by
which the problems are not improved at all.
The present inventors thus have studied the subject to
supply stably a transfer roll coating color by which an even
coated surface without any unevenness of coating surface
can be obtained as well as a highly gloss and smooth coated
surface can be obtained under a low pressure calendering
condition without affecting any of the advantages of the
tarnsfer roll coating, particularly a stable runnability at
a high speed on machine, and also a coated paper with
excellent printability comparable to those obtained by the
blade coating method by coating the said color.
Generally, if the coat weight is increased, a more
smooth surface can be obtained. The coat weight in the
transfer roll coating is controlled by adjusting a nip
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X13582'7
pressure between roll, circumferential speeds of each roll
and a solid content in the color.
Therefore, the present inventors considered that
increase in the coat weight could dissolve the above-
mentioned subject and studied about to the nip pressure
between rolls, the circumferential speeds and the solid
content in the coating color. In the case that the nip
pressure being lowered to enlarge the gap between rolls, the
coat weight is increased but a ring-form pattern may be
easily produced. In the case that circumferential speeds
are differentiated, the feeling of the coated surface
worsens. It is thus found that the coat weight may be only
slightly controlled in practice by differentiating the nip
pressure or circumferential speeds. Therefore, control of
the coat weight is mainly due to a function of the solid
content in the color. Then, for coating in a high coat
weight, the solid content of coating should be increased.
However, if the solid content is increased in such a range
of materials as used in the conventional transfer roll
coating color, viscosity is also increased to produce a
split pattern of the color on an aplicator roll. The said
pattern not only appears on the coated surface to damage the
feeling of the coated surface, but also produces boiling of ..
the coating, gum-up and scattering of color mists, by which
a great advantage of the transfer roll coating namely ,
wide webs, a high speed and stable operation on the machine
is not possible.
CA 02135827 2005-03-30
Then, by further study, the present inventors found
that if the solid content is 58 weight % or higher and
the viscosity of the color at the said solid content is
1,500 cps or less determined at 60 rpm by using a No. 4
rotor of a BrookfieldT'" viscosimeter, an even coating can
be carried out to give a highly glossy and smooth coated
surface under a low calendering condition without
affecting the advantages of the transfer roll coating,
particularly a high speed stable runnability on the
machine, as well as to give a coated paper with excellent
printing quality comparable to that obtained by the blade
coating method. Furthermore, we found that the coating
color wherein the solid content is 58 weight % or higher
and the viscosity determined at 60 rpm by using the No. 4
rotor of a BrookfieldT"' viscosimeter is 1,500 cps or less
can be obtained by use of a low viscosity adhesive, and
also that a coated paper having a good feeling of the
coated surface together with the viscosity can be
obtained, to complete the present invention.
SUMMARY OF THE INVENTION
An object of an aspect of the present invention is
to provide a transfer roll coating color comprising a
pigment and an adhesive as main components, characterized
in that a solid content in the color is 58 weight % or
higher and in that a viscosity of the color determined at
60 rpm by using a No. 4 rotor of a BrookfieldT"'
viscosimeter is 1,500 cps or less.
Another object of an aspect of the preset invention
is to provide a transfer roll coating color comprising a
pigment and an adhesive as main components, wherein the
adhesive contains a starch adhesive and the said starch
adhesive is a low viscosity starch adhesive with a
viscosity less than 3,000 cps determined at a solid
6
CA 02135827 2005-03-30
content of 30 weight % and a temperature of 50°C at 60
rpm by using a No.4 rotor of a BrookfieldTM viscosimeter.
Yet another object of an aspect of the present
invention is to provide a coated paper obtained by
coating a transfer roll coating color comprising a
pigment and an adhesive as main components, wherein a
solid content in the coating color is 58 weight % or
higher and a viscosity of the color determined at 60 rpm
by using a No. 4 rotor of a BrookfieldTM viscosimeter is
1,500 cps or less. The other objects become apparent by
the following description.
In accordance with another aspect of the present
invention, there is provided a transfer roll coating
color composed mainly of pigments and adhesives, the
transfer roll coating color wherein the adhesives are
starch type adhesives having a coefficient of viscosity
in the range of 580 cps or over and not exceeding 3,000
cps when measured under the following conditions:
viscometer: B-type viscometer (Brookfield~
viscometer);
#4 spindle: 60 rpm;
temperature: 50°C;
concentration of solid materials: 30 wt% or higher;
and the pigments have 10 or lower average aspect
ratio and 1,500 cps or lower coefficient of viscosity
when measured under the following conditions:
viscometer: B-type viscometer (BrookfieldTM
viscometer);
#4 spindle: 60 rpm; and
concentration of solid materials: 58 wt~ or higher.
In accordance with another aspect of the present
invention, there is provided a method of making a coated
printing paper comprising the steps of:
preparing a raw paper;
7
CA 02135827 2005-03-30
preparing a color composed of a pigment and a starch
adhesive having the following properties and a small
amount of additives as necessary with 58 weight% or
higher in solid components, and 1,500 cps or less in
coefficient of viscosity when measured at 60 rpm by using
a No.4 rotor of a BrookfieldT"" viscometer; the pigment:
or lower in average aspect ratio and
containing calcium carbonate having 5 or lower in
average aspect ratio and 3 ~m or less in average particle
diameter as 30 weight % or higher of the total pigment,
the starch adhesive:
3,000 cps or less in coefficient of viscosity when
measured at 30 weight o or lower in concentration, at a
temperature of 500C and at 60 rpm by using a No.4 rotor
of a BrookfieldTM viscosimeter, and
coating the color on both surfaces of the raw paper
with 5 g/m2 or more in solid components per each surface
by a transfer roll coater.
DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED
EMBODIMENTS
The adhesive used in the present invention should be
a water-soluble adhesive which can increase a solid
content without increasing viscosity when mixed with a
pigment, and should produce a sufficient adhering
strength for the pigment. By studying the properties of
the coating color and properties of the coated surface
when being transfer roll coated, we found that a starch
adhesive with a viscosity of less than 3,000 cps (a
Brookfield~" viscosimeter, &0 rpm, 50°C; hereinafter, the
viscosity of the starch adhesive is determined under the
said conditions) at the solid content in the adhesive of
30 weight ~ is most
7a
2135827
preferably used in the present invention. The said
viscosity is quite low, since the viscosity of the
conventionally used starch adhesives at the solid content of
30 weight ~o is at least 3,000 cps and in many cases 10,000
cps or higher. As the said low viscosity starch adhesives,
there may be mentioned denatured starches such as ethyl-
etherized starch, hydroxy ethyl etherized starch and low
viscosity oxidized starch, as well as denatured starch
adhesives such as starch latex copolymers. Furthermore,
from viewpoints of a strength in the coated surface and a
printing gloss, the low viscosity starch adhesive is
preferably used together with other adhesives, particularly
with latex adhesives having relatively low viscosity and
large adhering strength, rather than used alone. The amount
of the adhesive used is varied according to the kind of the
adhesive used and the kind of the pigment as well as the
required qualities of the desired coated paper, so that it
is not limited to 'a specified one. And, it is important
that the viscosity of the obtained coating color at the
solid content of 58 weight ~ being 1,500 cps or less.
Generally, coating can be carried out in the transfer roll
coating even if the viscosity of the color is low. For
example, a coating is carried out at a coating color
viscosity of about 10 cp in a sizing liquid coating, and
the viscosity is at most 100 cps. The reason why the
coating may be carried out at such a low color viscosity is
that an object of the sizing liquid coating is to increase
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-~ X13582'7
an inside strength and an outside strength. That is, since
the inside strength is not increased unless the sizing
liquid permeates into an inside of a base paper, the
viscosity of the sizing liquid should be low. In the case of
a pigment coating, if the viscosity of coating is too low,
the amount of the permeated coating color into the base
paper much increased, by which the color cannot be remain on
the surface of the base paper and a coating distribution
deteriorates. As a result, the smoothness of the paper
becomes inferior to lose gloss of the paper and
printability deteriorates also. Thus, the color used
according to the present invention is desirable to have
higher viscosity than that of the color used in the clear
coating and be a level not to produce a roll pattern such as
split pattern in the case of the transfer roll coating,
namely from above 100 cps to below 1500 cps. In the
viscosity of the pigment coating color, the effect of the
starch adhesive is considerable, so that, the viscosity of
the color may be varied considerably by the viscosity of the
starch adhesive. The viscosity of the starch adhesive used
in the said color is thus desirably from above 200 cps to
being 3000 cps.
Generally, the pigment is dispersed in a concentration ..
of about '70~, and the starch is formulated in a
concentration of about 35,x~ A concentration of latex is
about 50~. These are mixed to prepare a final color. The
suitable solid content as to each materials are however
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.~ ~13582'~
limited. For example, if the pigment is used at a higher
concentration of 80~ than the conventional one, there may
be a tendency to exert undesirable influences such as
undispersed materials. Furthermore, if the starch is
cooked at a higher concentration, the viscosity is
increased too much, which cannot produce an uniform starch
solution. Therefore, it may be difficult to adjust the
final solids the coating color to 70~ or higher, and the
concentration of from above 58%a to below '70~ is practical as
the concentration of the transfer roll coating color.
Generally, in the case that being used together with latex,
the low viscosity denatured starch is preferably used in an
amount of 1 ~15 weight ~ to the pigment. Even at 3 ~-9
weight ~, the required properties of the coating color and
the required qualities of the coated paper can be obtained.
In the case of the starch latex copolymer, it can be used
alone, and it is suitably used in an amount of 20~ 50
weight ~ to the pigment.
The pigment which can be used according to the present
invention is not particularly~limited if an aspect ratio
is small, and can be selected from the pigments
conventionally used for the transfer roll coating. In
addition, some kinds of pigments may be used in admixture .
according to the required qualities of the coated surface.
If the aspect ratio increases, the surface covering
property becomes better but the flowability of the coating
color decreases to produce a split pattern such as sprinkle-
1 0 ' . °_ ,.,
213582'7
shaded on an applicator roll at the time of the transfer
roll coating. As a result, there is a tendency that an even
and smooth coated surface is difficult to obtain, so that
the use of a pigment with large aspect ratio is less
preferable. If the average pigment size is large, the
viscosity of the color becomes low but the evenness and the
smoothness of the coated surface are affected. If the
average pigment size becomes too small, the viscosity of the
coating color increases to produce a split pattern such as
Orange peal or aventurine appearance on an applicator roll
at the time of the transfer roll coating, by which the even
and smooth coated surface may also not be obtained.
Therefore, it is necessary to select a pigment with an
appropriate aspect ratio and an average pigment size. Eor
these points, kaolinite clay or talc which are
conventionally advised for the coating pigment cannot be
used alone, since the average aspect ratio thereof is large
such as about 20 or about 30. The lower the aspect ratio,
the more even coated paper with good printability can be
obtained even if a pigment with small pigment size is used.
As the pigments suitable for use according to the
present invention, there may be mentioned ground calcium
carbonate, precipitated calcium carbonate, calcium sulfite, ..
pyrophilite and plastic pigments.wherein the aspect ratio is
or lower and the average pigment size is about 0.1.5 ~t
m. Among them, calcium carbonate wherein the average aspect
ratio is 5 or lower, more preferably 3 or lower, and the
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2135827
average pigment size being about 0. 5 -r 2 ,~ m is preferably
used. The other pigment which may be used with the said
calcium carbonate has preferably a low aspect ratio, and
from this point an organic pigment may be preferably used
together. Furthermore, in the case of the higher
requirements in gloss of the coated surface and opacity, a
pigment having a relatively large aspect ratio such as
kaolin may be used unless damaging characteristics of the
transfer roll coating are affected. Even in such cases, the
total aspect ratio of the pigment is preferably 10 or lower.
In the case of the pigments used together, the above-
mentioned calcium carbonate is preferably used in an amount
of 30 weight ~ or higher, more preferably ~0 weight % or
higher, based on the total pigment. '
The pigment and the adhesive are mixed, and additives
such as a water-proofing agent, an anti-foaming agent, a
dispersant, a preservative, a coloring agent and a parting
agent are added if required in an amount of about 0.1~. 2
weight ~, to give a final color. The thus obtained color
has a viscosity of 1,500 cps~or less even if the color
concentration is increased to 58 weight ~ or higher, which
is suitable for the transfer roll coating.
The transfer roll coating used in the present invention
is a coating method characterized in that a color supplied
by a color supplying means is transferred via a metering
means and optionally a smoothing means to an applicator
roll and then the color on the roll is transferred against
,,. ,; -.1:2 ' . ; ~;, ,:
213582?
a support at a positive rotation. The color supplying means
the metering means and the smoothing means are basically
constituted by multiple rolls positively rotating against
the applicator roll. However, in the case that the object
is higher metering or smoothing, a reversibly rotating
roll, rod, blade or an air may be arranged in a reverse
direction. The present invention may be applied to them
without any damage.
Coating of the color according to the present invention
is carried out by setting two gate rolls at a specified
distance in order to obtain for example the desired coated
amount and controlling the relative speeds of the rolls. The
color passes through the gate rolls to split the surface of
the rolls, by which a half thereof is transferred along the
transfer rolls to webs and the remaining half of the color
is returned to a color tank. When the color according to the
present invention is used, a high coat weight such as 5 g/mZ
or more which cannot be obtained by the conventional
transfer roll coating can be obtained without affecting the
high speed property of the transfer roll coating. And, by
coating 5 g/mZ or more, the coated surface with a high
smoothness, a high gloss and good printability can be
obtained. The coated amount on one side is preferably 515
g/mZ, more preferably 6 ~ 12 g/mZ.
By using the transfer roll coating color according to
the present invention, the coat weight can be increased
without producing any uneveness of coating surface specific
'. , ,:, 1., ,3 .: . .
-~, ~ ~ 213582'
to the transfer roll coating. And, a high speed and stable
operation on the machine may be realized without affecting
any advantage of the transfer roll coating. Additionally,
the coated paper obtained by coating the said transfer roll
coating color can be used to achieve a high smoothness and
a high gloss under a low calendering condition, and also the
paper has a high opacity, a stiffness and printability,
particularly an excellent printing gloss and no print
mottle, to give a coated paper with high printability
comparable to those obtained by blade coating. Therefore,
by using the transfer roll coating known hitherto as the
method to give a low-grade printing paper, a high-grade
printing paper can be obtained, which is a suprising effect.
Furthermore, since the covered layer with a superior
covering property can be obtained by a high speed and stable
coating on machine, it is excellent for undercoating in the
case of multi-layer coating on machine. The reason why
the coated paper with a high gloss, a high smoothness and
high printability can be obtained by using the transfer roll
coating according to the present invention is not clear,
but can be considered as follows.
The color according to the present invention is
superior in flowability since a viscosity is low in spite -.
of a high solid content, so that even coating can be
carried out by forming an even coated film at a roll
distance of the transfer rolls. Also, a high coat weight
such as 5 g/mz or more can be realized by controlling the
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. 2135827
roll distance and a circumferential speed because of the
high solid content. Furthermore, since the solid content of
the color is high, permeation of liquid component
containing a binder into a base paper becomes less, to form
a bulky coated layer. Therefore, if opacity increases, a
stripy unevenness of coating surface specific to the
transfer roll coating can be corrected by a low pressure
calendering treatment, to give a high gloss and a high
smoothness. Furthermore, a porous coating layer may be
formed by a high solids coating, to supplement a decrease of
an ink set due to an increase of a coat weight as well as
to give a coated paper with good printability and superior
printability since stiffness is increased.
Additionally, since the color according to the present
invention has a viscosity range suitable for the transfer
roll coating, there is not produced boiling of the color or
color mists during coating. Since the solid content is high,
an absolute water~content becomes less than that of the low
solid content color, which causes less contaminant on a
lead-out roll, an expander roll and an after dryer just
after coating and less amount of water permeating into the
coating base paper. Thus, a drying load becomes lighter, so
that the high speed coating can be carry out in spite of
increased coated amounts.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is illustrated in more detail by
the following examples and comparative examples, which do
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2135827
not limit the invention.
First, a formulating method of an adhesive solution
used is described and then a formulating method of a
transfer roll coating color and preparation examples of
coated papers are described.
In the following examples, parts and ~ are by weight
unless otherwise described. Furthemore, blending parts in
tables are all based on solids.
[Fomulating of an adhesive solution]
Water was added to an adhesive to adjust a solid
content to 30%, stirred and dissolved while keeping the
temperature at 95 °G or higher. After being dissolved, the
temperature was adjusted at 50'G, and a viscosity was
determined at 60rpm with use of a BrookfieldT" viscosimeter.
Examples of low viscosity starch adhesives (1) ~.(3)
and conventional starch adhesives (1) ~.(2) as well as
determined results of the viscosity are shown in Table 1.
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213582'7
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=-~ 2135827
[Formulating of a transfer roll coating color)
0. t parts of a dispersant and 0. O~t parts of sodium
hydroxide were added to a specified blended pigment and then
dispersed in water by means of a Serie''" dispersing
device, to formulate a pigment slurry with a content of 73~.
Then, the above-mentioned formulated adhesive solution as
an adhesive and SH latex with a solid content of 50~a were
added, and furthermore a lubricant and a water-proofing
agent were added, and at last water was added, to formulate
the target concentration and make a transfer roll coating
color.
The preferable pigment used in the following examples
and comparative examples is ground calcium carbonate with
an average aspect ratio of 2 -r 6.
[Preparation of a coated paper]
By using the obtained color as described above and
adjusting a gap between rolls and a circumferential speed to
give the desired coat weight, 64 g/m2 of a fine base paper
was coated at a speed of 600 m/min by the transfer roll
coater. The obtained coat paper was subjected to a
seasoning under conditions of 20 'g and 65% relative
humidity for a day and night, and then subjected to a
calendering treatment.
( Examples 1 ~.. 2, Comparative examp les t ~.. 2
Transfer roll coating color of Examples 1-r2 and
Comparative examples t~ 2 were obtained according to the
above-mentioned formulating method of the coating color by
. 1 8 . _ : . ~ '~~.::;
y 213582?
using blends of pigments and adhesives shown in Table 2. In
addition, coated papers were prepared,according to the
above-mentioned preparation method of the coated paper as to
each color. The viscosity of colors, smoothness of coated
paper and printability (gloss, print mottle), determined or
evaluated by the following determination and evaluation
methods are shown in Table 2.
[Viscosity of the color, a determination method of a
smoothness, evaluation method of printability]
[Viscosity of the color)
A viscosity at a concentration of a color formulated
was determined at a room temperature by means of a
Brookfield T" viscosimeter at a rotation number of 60 rpm.
[Unevenness of coating surface]
An unevenness of coating surface in the coating surface
of the coated paper was evaluated visually.
Do Unevenness of coating surface was not observed at
all.
Q Unevenness of coating surface was hardly observed.
p Unevenness of coating surface was slightly
observed.
X Unevenness of coating surface was clearly observed.
X X Unevenness of coating surface was severe and
spotty.
[Smoothness]
1. 9 .. ' , ..- _ ..
2135~2'~
.~
Smoothness in the coating surface of the coated paper
was determined by means of a Oken-sikiT" smoothness factor.
[Printing gloss]
Printing was carried out with a RI-IIT" type printing
tester by using 0.4 cc of ink ftradename: TK MARK-cyan,
available from Toyo Ink Co., Ltd.] on the coating surface of
the coated paper, and after seasoning for a day and night,
75 ° gloss was determined by means of a glossmeter
available from Murakami Shikisai Kenkyusho.
[Print-mottle]
Printing was carried out with a RI-IITM type printing
tester by using 0.4 cc of ink ftradename: TK MARK-cyan,
available from Toyo Thk Co., Ltd.] on the coating surface
of the coated paper, and after seasoning for a day and
night, print mottle was evaluated visually by a five
points method ( 5 good ~..1 bad ).
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_~ 2135827
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a~
p ~
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N ~ fn cd ~ ~O N lfl
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7 !/1 'Q
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M
N t!~
E lf~ ~ r-
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cd
O
O U
>
-~~ ~ ~
U
V i1 L -
l ~ '-' v0 tL~
L
6
3
O
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O O ~ N
a
0o v~
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m a~
ae
~
.
c0 o ~~
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v0
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Ll. fr ~ GL
U Sr ~~ O
-> > ~ b
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.
0 lr..~,. s d~ . . . . . ~ , ~~. ~ ~ ~~ ~~'~ . . ~ ~ . . - . ,Y . ~'
2135827
--,,
As is apparent from these examples'and comparative
examples, the coated papers obtained by use of the transfer
roll coating color according to the present invention were
excellent in printability, particularly against print
mottle. The color in comparative examples could be coated
in 10 g/mz on one side, but unevenness of coating surface
(split pattern) specific to the transfer roll coating was
produced and print mottle was also increased. In addition,
boiling was produced and runnability during coating was
inferior since the viscosity of the color was high.
(Examples 3~~, Comparative examples 3~-~~
Color were formulated with the blending ratio of
pigments and adhesives shown in Table 3, and then coated
papers with coat weight of 5 g/mZ and 7.5 g/mz on one side
were prepared as to each color.
Viscosity of color, smoothness of coated papers and
printability (gloss, print mottle) were determined or
evaluated by the determination and evaluation methods
similar to those in Example 1, and results are shown in
Table 3.
22
.~;.' .. ,~ ' .,~. . , t ' . ~ a ..
2135827
u' ~ X ~ ~
W > X ~ ~
o
n ~ .c
.,-~ U .,.~
n
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N ~
(~. ~ C1
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N
N.7.~,C~ O
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~ ~ ~
~
N ~t
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>
M ~
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~ E N~N U N'-"' tl~
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v
> ~
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p U
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7
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~ ~ ~ ~.. cd
~.
U ~ V1: fly U. U
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. 2 3 ; :. .
2135827
As is apparent from these examples, the coated paperes
with use of the color according to the present invention
were excellent in printability, particularly against print
mottle. In Comperative examples 4, 6 and 8, smoothness and
printing gloss could not be determined since unevenness of
coating surface being occured. Furthermore, in the
Comparative examples, stripy print mottle specific to the
transfer roll coating was observed. Particularly, in the
comparative examples 3 and 5, stripy unevenness of coating
surface was severe and also print mottle was remarkable.
(Examples 5~-6, Comparative examples 9-rl4J
Color were formulated with the blending ratio of
pigments and adhesives shown in Table 4, coated papers were
prepared as to each color and then subjected to a
calendering treatment under a high linear pressure.
Viscosity of color, smoothness of coated papers and
printability (gloss, print mottle) were determined or
evaluated by the determination and evaluation methods
similar to those in Example 1, and results are shown in
Table ~..
2 4 ;. ,. .:, y >:: : .. . . ~;:
213582'
X I
i
y > X I
o I
-' n ~ ~
,a U ,-I
n
~ ~
~. ~ C cd N N tf~
N r- ~
O J.-> .G O
~
> U7 'b N O~ U1
cd
U
c~, 'r ''' X I
I
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o X I
~ I
m ~
U rl n
N
L~.~ l ~N ~~ ~ ~ ~'-'t~~
E
O 1.~ _C N
v
~ ~ ~ ~ N ~tt~
EL7 XO
"'
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V ~
~ ~ X I
I
p ?
N
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I
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~
L(1 N C U ~.. l~
Lf1 U7 O
N
c '- "_, ~'
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> !I7 'CJ N N LIl
X
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.
O
U
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~
O
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l
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tb
W ..
d O
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t
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.,
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t~ 0
O ~ O ~
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.. (d . 00
t O
t
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., -~ y
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s
~ v ~ ~n U
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..:1r ,....,. ' . . ~~.::. . .... . ,.- , , ~.: ., ,.,..' ... ....
213582?
As is apparent from these examples, the coated paperes
with use of the transfer roll coating color according to the
present invention were excellent in printability,
particularly against print mottle, even after being
subjected to the calendering treatment under the high
linear pressure. On the contrary, in Comperative examples
~., 6 and 8, smoothness and printing gloss could not be
determined since unevenness of coating surface occured.
Furthermore, in the comparative examples, stripy print
mottle specific to the transfer roll coating was observed,
and could not be improved after being subjected to the
calendering treatment under the high linear pressure, as
well as being inferior in printability. Particularly, in
Comparative examples 3 and 5, stripy unevenness of coating
surface was severe and also print mottle was marked.
Examples 7~9, Comparative examples 15~20J
In Examples 7~9 and,Comparative examples 15 -r 20,
color was formulated with the blending ratio of pigments
and adhesives shown in Table 5, transfer roll coated at a
coating speed of 1000 m/min. by means of a practical on-
machine coater, and subjected to a soft calendering
treatment under a linear pressure of 30 kg/cm. Comparative
examples 18... 20 were commercially available products ,
according to a blade coating having the same grades as in
the Examples.
Viscosity of color, smoothness of coated papers and
printability (gloss, print mottle) were determined or
,~ ,...' , . , ., .. . . 2 6 r ...v; '°' , . , ;. . . : .
213582'
evaluated by the determination and evaluation methods
similar to those in Example 1, and results are shown in
Table 5.
r ::..: ; ';' ~..,' ?. ._ 2 7 ~ ; :' . «:' , ,y ,,, '=.,
213582'
...... . . . o
f/~
r1
Q' O , . . . O\ Lh
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.
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O 7
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U >
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1V1
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f ;,i
x r k ~,- a.~. . ~~r ,u.,.
a k.~-
,..2 8 ,~..:' ~r,. ~ ,. ,. .~:k.,...
... ' ... . , , :" . ;.:
,~ '~ ~ ~, . ~... ,
2135827
As is apparent from these examples, the coated paperes
with use of the transfer roll coating color according to the
present invention were excellent in printability,
particularly against print mottle. In addition,. the papers
according to the present invention had equal or higher
printability when compared with the commercially available
products obtained by the blade coating, that is, which is
superior to those of the transfer roll coated products.
furthermore, the said papers according to the present
invention could be prepared without separating a base paper
preparation procedure and a coating procedure such as used
in the conventional blade coating. Additionally, a speed of
on-machine-transfer roll coating according to the present
invention was equal to a speed according to the blade
coating, and a wide high speed coating which surpassed the
blade coating could be carried out.
(Examples 10 ~13, Comparative examples 21 ~.24)
Colors were formulated with the blending ratio of
pigments and adhesives shown in Table 6, and coated papers
with coat weight of 5 g/mZ and~8 g/mz on one side were
prepared as to each colors.
Viscosity of color, smoothness of coated papers and
printability (gloss, print mottle) were determined or
evaluated by the determination and evaluation methods
similar to those in Example 1, and results are shown in
Table 6.
. .. , , ~.. ~.;. :.. ; ., . 2 9.. ;: ;: ~ :~~. f~ ~. . ..- .., ', ,;:.,
2135827
~ l(1 y0 O
O N
N
~ >
t~' ,-i .~ n O~
~ ~~ ~ ~ ~' ~
~
~
X ~-OM
L
cu O yr
O
O
N O~ L(1
X ~
~MN
cb
a
o
U
N
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Q~oM
,r ~ M ~- M
N
~~~ ~ U~
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> U M
3 cd ~ M lf1
O ~ O~
lf~ M
~
i ~ -' - M
a
a~
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co x ~ mn
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W '
~
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O U ~.-~ O
~
U
G.
O
I
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N M
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> V~ 'D 00 L!1
~
~MM _
O
r-I x,
O
O N
U
cb
w ..
O ~ p
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i~
O 8'C
O U a
Q
~~ ~ . ti fly t
d
O
0 ~ ~ U1 C
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.1~. 0 .. .C ' r
0 .t-~ f ~ ~~mi~ '
t
~ Nfl 0
Q
.t . o~ ~ ~ o0 ~.
r a
~ ~ ~
~ ~
~ ~ . b ~ + .N c
c ~ o
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o ~ ~ i .
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0
C U ~ ~ U ~ ~ Q. U
1 d.
>
~. .. 3~ ., _,,...
X135827
As is apparent from these examples, the coated paperes
with use of the transfer roll coating color according to the
present invention were excellent in printability,
particularly against print mottle. In Comparative examples
21 and 2~, the coat weight of 8 g/mz could not coated due
to the structure of the transfer coating machine.
Furthermore, in Comparative examples 22 and 23, unevenness
of coating surface occured and stripy print mottle specific
to the transfer roll coating was observed.
(Examples 14.1'7, Comparative examples 25~J30)
Color were formulated with the blending ratio of
pigments and adhesives shown in Table 7, and coated papers
with coat weight of 6 g/mz and 7.5 g/mz on one side were
prepared as to each color. Viscosity of color, smoothness of
coated papers and printability (gloss, print mottle) were
determined or evaluated by the determination and evaluation
methods similar to those in Example 1, and results are
shown in Table 7. '
31
z13582~
~ '_'' X ~c?m
o c ~
a
> X ~
o
s ~ c
..~ v ..~ o
..
O O
cri ~ N
~ ,~
~ m
V
> m X
v
c> m
c~
~ X m
N ~
a~
a
X ~ O N
N ~ .-
m o o ~ m
> m ~ m
m
X N
L N L(~ ~ M
c0
a
E
O
U Its
c~ > N
4
m ~ m
O
lt1 N
N v !~
N
d
y 0 N
~ V
N ~ M
"
N ~
O ~.,
N
O
N
O ~
O
O U O
H
> N
~
.-r O
r-1
Gl
.
~' ~ ~ ~ E
.-r U
00
~- v0 ~ X
N lf~
O
O ~ ~ ~' O
0
O
.N
O
d
~
~
U U ~ L
.
U U~
O
.ri~ 1~ C d U1 O ~
. ~'' ~ 0 V ' ~
~ ~ 00
3 O c f y tl! 7
d .. .~ N
d O a ~ N d0 O L.
cUd
.t ~w C C 6
U ~ U ~ ' O ~ 1~ ~ 3~
> ~
~C O ~ .
N ~ ~ t1 ~ O
~ 0 . U
r V > ~ t/7d ~.
-1 1
., , 3 2 :;;: , , , ~ ,
~13582'~
As is apparent from these examples, the coated paperes
with use of the transfer roll coating color according to the
present invention were excellent in printability,
particularly against print mottle. In Comparative examples
25~ 30, unevenness of coating surface occured and stripy
print mottle specific to the transfer roll coating was
observed.
3. -3 . . ; , ':: .
