WO2011105552A1 - 印刷用塗工紙およびその製造方法 - Google Patents
印刷用塗工紙およびその製造方法 Download PDFInfo
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- WO2011105552A1 WO2011105552A1 PCT/JP2011/054289 JP2011054289W WO2011105552A1 WO 2011105552 A1 WO2011105552 A1 WO 2011105552A1 JP 2011054289 W JP2011054289 W JP 2011054289W WO 2011105552 A1 WO2011105552 A1 WO 2011105552A1
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- coating
- printing
- viscosity
- coating liquid
- paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
- D21H23/48—Curtain coaters
Definitions
- the present invention relates to a method for producing a coated paper for printing and a coated paper for printing, and particularly to a method for producing a coated paper for printing and a coated paper for printing obtained by a curtain coating method.
- blade coating is leveling coating (smooth coating) in which the coating liquid is applied to the base paper, and then the excess coating liquid is scraped off by the blade to finish the desired coating amount.
- This is a method of coating. Therefore, the smoothness of the coated surface is good, but the coating amount is affected by the unevenness of the base paper, so that it tends to be a mottled coated surface. In severe cases, the coating liquid is scraped off to the extent that fibers are exposed at the convex portions of the base paper because the surface of the base paper is scratched with a blade.
- roll coating is a so-called pre-lightweight coating method in which a coating previously metallized on a roll is transferred to a base paper for coating. For this reason, it is necessary to spread a desired amount of paint uniformly on the roll in advance, and there is a problem that complicated apparatuses and operations are required. Moreover, it is very difficult to obtain a coated surface without coating unevenness because a streak pattern is likely to occur during coating, and the viscosity and concentration of a usable coating solution are limited. In addition, when foreign matter is mixed on the roll to which the coating liquid is transferred, there is a possibility that a part where the coating liquid on the roll is not transferred to the base paper may be generated.
- non-contact type coating methods such as a curtain coating method and a spray coating method are known.
- the curtain coating method is a coating method in which a coating liquid layer is formed on a base paper by forming a film of a coating liquid and passing the base paper through the film, and the equipment does not touch the base paper at the time of coating. Therefore, in terms of operation, there are fewer paper breaks during coating, and no consumables are generated. Further, even if the coating speed increases, the load on the base paper does not change, so that ultra-high speed coating is possible.
- Curtain coating is a pre-weighing coating method in which all dropped paint is transferred to the base paper.
- the management of the coating amount is easy, and a coated paper having a desired coating amount can be obtained by controlling the concentration and flow rate.
- the coating amount in the width direction and the flow direction becomes uniform by forming a curtain film of uniform paint.
- it since it is non-contact, it can transfer without pushing a coating material into a base paper, the coating layer of uniform thickness is obtained, and the covering property to a base paper becomes favorable.
- the curtain coating method can provide a uniform coating layer, there is an advantage that mottling due to uneven ink absorption hardly occurs during printing. Furthermore, since air permeability is also good, blister suitability is good.
- the curtain coating method is a very excellent coating method, and its use for pressure-sensitive copying paper (Patent Document 1), thermal paper (Patent Document 2), and wax coating on paperboard has been proposed. Yes.
- Patent Document 4 a method using a base paper with high smoothness has been proposed.
- the base paper has high smoothness, a paint pool called paddling occurs on the tangent line where the curtain film and the base paper collide with each other. Defects are likely to occur (Non-Patent Document 1).
- processing such as calendering is performed in order to increase the smoothness of the base paper, the density increases and the quality such as a decrease in opacity decreases.
- JP 54-85811 A JP-A-54-74761 JP-A-6-294099 Japanese Patent Laid-Open No. 5-247890
- the problem of the present invention is that a fine uncoated part (hereinafter also referred to as “crater”) is not easily generated even by high-speed coating, and the coated paper for printing excellent in blank paper quality and printing quality is efficiently applied by curtain coating. It is to provide the technology to manufacture.
- the coating liquid used for general printing coated paper cannot reduce the concentration and viscosity in terms of quality, drying energy and coating speed.
- the coating material for the color developing layer of thermal paper or pressure-sensitive copying paper generally has a viscosity of about 100 to 400 mPa ⁇ s
- the coating liquid used for producing general printing coated paper has a viscosity of about 100 to 400 mPa ⁇ s. Is about 1000 to 4000 mPa ⁇ s. If such a high-viscosity coating liquid for general printing coated paper is used as it is as a coating liquid for curtain coating, bubbles are easily taken into the curtain film, and the uncoated part due to foam is applied to the coated surface. It may appear like an abalone.
- the coating liquid is stretched many times in the direction of travel due to the difference between the falling speed of the curtain film and the traveling speed of the base paper, so that the curtain film breaks as soon as it touches the base paper. Is mentioned.
- this bubble is stretched by the difference between the falling speed of the curtain film and the traveling speed (coating speed) of the base paper, and becomes a length several times the size of the initially generated bubbles. This is a particularly serious problem when high-speed coating is applied, such as coated paper.
- Another cause of craters is that when the smoothness of the base paper is rough, the coating liquid coating does not keep up with the high-speed progress of the base paper, creating a gap between the base paper and the coating liquid. For example, the coating liquid film is broken by contraction or expansion of air in the gaps, and craters are generated in the coating film.
- the curtain film falling speed and the base paper advance speed are as follows: It was found that the liquid property of the coating liquid is important for eliminating the crater caused by the difference between the two.
- the present inventors are able to efficiently produce high-quality printing coated paper with suppressed crater generation by curtain coating by using a coating liquid having specific fracture characteristics and viscosity.
- the headline and the present invention were completed.
- the present invention includes the following inventions (1) to (3).
- a method for producing a coated paper for printing in which a coating layer is formed on a base paper by passing the base paper through the curtain film of the coating liquid, the breaking time of the coating liquid being 500 ms or more, and B at 30 ° C.
- a printing coating having a mold viscosity of 1000 mPa ⁇ s to 3000 mPa ⁇ s, and the coating liquid containing a viscosity improver containing a polymer having a molecular weight of 400,000 or more mainly composed of acrylic monomer units. Paper manufacturing method.
- the viscosity improver is preferably an alkali thickening type or a non-alkali thickening type.
- Breaking time of the coating liquid is 500 ms or more, B-type viscosity at 30 ° C. is 1000 mPa ⁇ s to 3000 mPa ⁇ s, and the coating liquid has a molecular weight mainly composed of acrylic monomer units.
- a fine uncoated part is not easily generated even at high speed coating, and a coated paper for printing excellent in blank paper quality and printing quality can be efficiently produced by curtain coating.
- the coating liquid used in the present invention has a breaking time of 500 ms or more and a B-type viscosity at 30 ° C. of 1000 to 3000 mPa ⁇ s.
- the breaking time of the coating liquid is a value representing the ease of elongation (threading property) of the coating liquid.
- the breaking time in the present invention is as follows: 1) Enclose a coating liquid having a liquid temperature of 30 ° C. between a pair of circular plates with a diameter of 8 mm (gap 3 mm) arranged so that the axis of the viscometer is coaxial and vertical; 2) The upper plate is pulled up 6 mm vertically at a speed of 300 mm / second and held as it is, and 3) It is obtained by measuring the time from when the plate starts to be pulled until the coating liquid filament breaks. The time before the filament breaks is preferably measured with a laser, and the time resolution at this time is preferably about 2 ms.
- An example of an apparatus capable of such measurement includes an extension viscometer (model name: CaBER1) manufactured by Thermo Harke.
- the coating liquid break time is shorter than 500 ms, the elongation that occurs instantaneously when the curtain film contacts the base paper due to the difference between the falling speed of the curtain film made of the coating liquid and the traveling speed of the base paper (coating speed).
- the coating liquid cannot follow, the curtain film is broken, and a crater-like minute uncoated portion is generated. That is, the higher the coating speed, the higher the spinnability of the coating liquid.
- the longer the breaking time of the coating liquid used when producing the coated paper for printing the longer the better, 500 ms or more is more preferable, and 700 ms or more is even more preferable.
- the break time is 500 ms or more
- the B-type viscosity at 30 ° C. of the coating solution exceeds 3000 mPa ⁇ s
- the defoaming property of the coating solution is deteriorated, and the stability of the curtain film is reduced.
- a hole due to bubbles opens in the coating layer, and craters are generated, so that the quality of the coated paper is significantly deteriorated.
- the said B-type viscosity of a coating liquid exceeds 3000 mPa * s, since the liquid feeding of a coating liquid becomes difficult, it is unpreferable.
- the B-type viscosity of the coating solution is No. It is preferable to measure at a rotational speed of 60 rpm using a rotor of 4.
- a viscosity improver can be suitably used in order to prepare a coating liquid having the above properties.
- the viscosity improving agent used in the present invention is an agent having an action of adjusting the fluidity of the coating liquid, and a coating liquid having a break time of 500 ms or more can be easily prepared by blending the viscosity improving agent.
- the breaking time and viscosity characteristics of the coating liquid used in the present invention can be adjusted mainly by the addition amount of the viscosity improver, but if the viscosity is adjusted somewhat, the solid content concentration of the coating liquid should be increased. Can also be adjusted. This is because by increasing the solid content concentration, the interaction between the pigment particles and other compounds in the coating liquid is likely to occur, and the breaking time of the coating liquid can be increased.
- the viscosity improver of the present invention gives the curtain coating solution an appropriate viscosity that is not too high, so that the solid content concentration of the coating solution can be increased and the printing quality of the coated paper can be improved.
- the solid content concentration of the coating liquid is not particularly limited, but is preferably 60% by weight or more, and more preferably 63% by weight or more.
- the upper limit of the solid content concentration is not particularly limited, but is preferably 75% by weight or less, and more preferably 70% by weight or less in consideration of liquid feeding properties.
- Viscosity improver examples of the viscosity improver used in the present invention include a viscosity improver containing a polymer mainly composed of acrylic monomer units and having a molecular weight of 400,000 or more.
- the polymer mainly composed of acrylic monomer units refers to a polymer composed of 50% by weight or more of acrylic monomer units.
- the remaining monomer units in the polymer may be known monomer units.
- viscosity improvers examples include alkali thickeners or non-alkali thickeners.
- the alkali thickening type viscosity improver is an aqueous solution of a viscosity improver or a dispersion in which a viscosity improver is dispersed in water, and an arbitrary alkali is added to bring the pH of the solution into an alkaline region.
- the polymer contained in the alkali thickening type viscosity improver may be water-soluble or may be dispersed in water to form an emulsion.
- an alkali thickening type viscosity improver is an emulsion in which a polymer is dispersed in water.
- an alkali is added, the micelle of the polymer in the emulsion is broken, resulting in an emulsion that becomes a highly viscous liquid. preferable.
- the alkali thickening type viscosity improver has the effect of increasing the viscosity of the entire coating solution.
- the alkali thickening type viscosity improver adsorbs the polymer (polymer) present in the viscosity improving agent after thickening (after the micelles are broken) adsorbed to pigments and latex particles mixed in the coating liquid.
- a three-dimensional network structure is formed, and it also has an effect of imparting structural viscosity to the coating liquid.
- the coating liquid used in the production of the coated paper for printing is generally on the alkali side, when an alkali thickening type viscosity improver is used, the rupture time and B type viscosity of the coating liquid are reduced. Can be effectively increased.
- the larger the molecular weight of the polymer in the viscosity improver the higher the effect of increasing the breaking time and B-type viscosity of the coating liquid, especially the spinnability, so the polymer in the viscosity improver used in the present invention
- the molecular weight is 400,000 or more. However, if the molecular weight is too high, the viscosity of the coating solution may increase too much, so that the molecular weight of the polymer is preferably 4 million or less.
- the molecular weight of the polymer refers to a weight average molecular weight determined by gel permeation chromatography in terms of polystyrene.
- the addition amount of the alkali thickening type viscosity modifier is preferably 0.1 to 1.0 part by weight, preferably 0.1 to 0.5 part by weight, based on the total solid content of the pigment in the coating liquid. More preferred. If the amount added is less than 0.1 parts by weight, sufficient rupture time cannot be imparted to the coating solution. If the amount added exceeds 1.0 part by weight, the viscosity of the coating solution increases, Defoaming performance is significantly reduced.
- the non-alkali thickening type viscosity improver is an aqueous solution of a viscosity improver or a dispersion in which a viscosity improver is dispersed in water, and an arbitrary alkali is added to bring the pH of the solution into an alkaline region.
- Such a non-alkali thickening type viscosity improver is preferably such that no chemical change or the like occurs in the polymer even when an alkali is added in an aqueous solution of the polymer or an emulsion in which the polymer is dispersed in water.
- the polymer contained in the non-alkali thickening type viscosity improver is preferably a polymer mainly composed of a polycarboxylic acid salt composed of an acrylic monomer unit, which is stable with respect to pH. This polymer may be water-soluble or may be dispersed in water to form an emulsion.
- the molecular weight of the polymer contained in the non-alkali thickening type viscosity improver is 400,000 or more, and preferably 800,000 or more.
- the molecular weight of the polymer is preferably 4,000,000 or less because the viscosity of the coating liquid increases as the molecular weight increases.
- the alkali thickening type viscosity improver is neutralized and thickened in the alkali region. For this reason, in systems where free metal ions are present, the system is less likely to be alkali, and the thickening effect may not be significant, especially in coating solutions containing a high amount of calcium carbonate, where the thickening effect is not significant. There is. On the other hand, non-alkaline thickening type viscosity improvers do not change the thickening effect even in the presence of free metal ions, so they can efficiently provide stringiness even in coating solutions containing high amounts of calcium carbonate. Can do.
- natural polysaccharide-based viscosity improvers such as starch and CMC can be used in combination as a viscosity improver, and the fluidity of the coating solution can be adjusted by adding various starches.
- starch which uses tapioca, corn, etc. as a raw material can be used.
- acetylated starch made from tapioca is preferable because of its high effect on spinnability.
- the coating solution used for curtain coating comprises a pigment.
- the pigment conventionally used for coated paper can be used.
- examples include inorganic pigments such as kaolin, clay, heavy calcium carbonate, light calcium carbonate, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, and satin white, and organic pigments such as plastic pigments.
- Organic / inorganic composite pigments can be used, and these pigments can be used alone or in admixture of two or more as required.
- a pigment having a nearly spherical shape is blended in the coating liquid rather than a pigment having a plate shape.
- the value obtained by dividing the specific surface area determined by the BET method by the specific surface area calculated by assuming that the particles are perfect spheres from the particle size distribution measured by the laser diffraction formula (flatness) is It is preferable to use a pigment of 2.0 or less, and it is more preferable to use a pigment having an aspect ratio of 1.5 or less.
- the higher the flatness value the higher the flatness of the pigment.
- curtain coating which is a non-contact coating method, has a tendency to make it difficult for the pigment to orient in the direction of travel of the base paper when a flat pigment is used, compared to the contact coating method. If a large amount of is used, the pigment cannot be regularly aligned, the smoothness of the coated paper surface is reduced, the voids in the coating layer are increased, the ink penetration during printing becomes severe, and the printing gloss The degree is considered to decrease.
- the defoaming property of the coating liquid is improved and the occurrence of craters is suppressed. That is, when a flat pigment having a flatness ratio of more than 2.0 is used, the defoaming property tends to be deteriorated because the flat pigment hinders the movement of bubbles when defoaming, whereas the flatness ratio is 2. When a pigment having a spherical shape of 0 or less is used, the movement of bubbles is hardly inhibited, and the defoaming property is not easily lowered.
- the pigment is a calcium carbonate obtained by wet pulverization of light calcium carbonate of spindle-shaped calcite crystal, and has an average particle diameter (d50) measured by an X-ray transmission type particle size distribution analyzer.
- d50 average particle diameter measured by an X-ray transmission type particle size distribution analyzer.
- particle diameter of 50% by weight is 0.1 to 0.5 ⁇ m
- the BET specific surface area is in the range of 10 to 30 m 2 / g
- Sharpness (d30 / d70) ⁇ 100 [Wherein d30 is a particle size of 30% by weight and d70 is a particle size of 70% by weight]
- crystallization which the spindle-shaped primary particle aggregated and formed the rosette-shaped secondary particle is light calcium carbonate before a grinding
- the average particle diameter (d50) of the light calcium carbonate before pulverization measured with an X-ray transmission particle size distribution analyzer is 1.4 to 3.0 ⁇ m, and the BET specific surface area is 4 to 12 m 2 / g. More preferably.
- the blended amount of the ground calcium carbonate is preferably 40 to 100 parts by weight, more preferably 60 to 90 parts by weight per 100 parts by weight of the pigment.
- an adhesive agent binder
- a curtain coating liquid a coating liquid
- an adhesive agent binder
- a curtain coating liquid a curtain coating liquid
- the adhesive agent conventionally used for coated paper can be used.
- various copolymers such as styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl
- Synthetic adhesives such as methacrylate copolymers; proteins such as casein, soy protein, synthetic proteins; etherified starches such as oxidized starch, positive starch, urea phosphate esterified starch, hydroxyethyl etherified starch, and dextrin Starch;
- One or more kinds of usual adhesives for coated paper such as cellulose derivatives such as carboxymethylcellulose,
- These adhesives are preferably used in the range of 5 to 50 parts by weight, more preferably about 8 to 30 parts by weight per 100 parts by weight of the pigment.
- the curtain coating layer can be made into a plurality of layers.
- the weight ratio of the adhesive of each layer is 1: 0.5 to 0.8: It is preferably 0.7 to 1.0.
- auxiliary agents blended in ordinary pigments for coated paper such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, colorants, surfactants, etc. Can also be used as appropriate.
- Base paper There are no particular restrictions on the base paper used in the present invention, with the exception of commonly used high-quality paper, medium-quality paper, reprint paper, machine-coated paper, art paper, cast-coated paper, synthetic paper, resin-coated paper, plastic film, etc. It can be used without.
- a base paper with low smoothness may be used, but within a range where no paint pool called paddling occurs during curtain coating.
- Highly smooth base paper can be used.
- a method for improving the smoothness of the base paper it is effective to perform a pre-calendar treatment before curtain coating.
- a clear paint mainly composed of starch or a base paper pre-coated with a paint containing a pigment before curtain coating it is possible to use a clear paint mainly composed of starch or a base paper pre-coated with a paint containing a pigment before curtain coating.
- pre-coating before curtain coating it is used without exception in the state of the base paper after pre-coating, such as performing curtain coating with the paint on the base paper wet without passing through the drying process. be able to.
- the curtain coating layer may be one or more layers.
- the coating liquid having specific breaking characteristics and viscosity characteristics in the present invention may be used in any layer, and may be used in one or more layers, but the lowermost layer in contact with the base paper. It is preferably used as a working solution or as the uppermost layer coating solution, and most preferably used as the lowermost layer coating solution in contact with the base paper.
- curtain coating is a coating method in which a coating solution is formed on a base paper by allowing the coating liquid to flow down in the form of a curtain to form a film and passing the base paper through the film.
- Curtain coating is a contour coating in which a coating layer is formed along a base paper, and has a characteristic that the coating amount can be easily controlled because of a so-called pre-weighing system.
- the coated paper is produced by applying a single layer or multiple layers by curtain coating on both sides or one side of the base paper.
- a coating method other than curtain coating in the coating of any layer, for example, after applying a pigment coating liquid by a curtain coating device
- the pigment coating solution may be applied by a blade coating apparatus, or the curtain coating may be performed after the blade coating.
- wet-on-wet coating may be performed in which the upper layer coating is performed without drying the lower layer coating portion.
- the composition ratio of the adhesive of each layer is as described above, and after applying the lowermost layer, an intermediate layer is formed without drying the lowermost layer, and It is preferable to form the uppermost layer without drying the intermediate layer.
- a good curtain coating film can be formed while reducing the blending amount of the adhesive.
- the coating amount of the coating layer in the present invention is suitably 3 to 30 g / m 2 in terms of dry weight per side. If the coating amount is less than 3 g / m 2 , the unevenness on the surface of the paper substrate cannot be sufficiently covered, and the acceptability of the printing ink may be significantly reduced. On the other hand, if the coating amount of one layer exceeds 30 g / m 2 , the operability is deteriorated, for example, the drying property at the time of coating is deteriorated, or printing unevenness due to binder migration is caused, which is not preferable. Even when the coating layer is composed of multiple layers, it is preferable that the coating amount be 30 g / m 2 or less per side.
- a known apparatus used for curtain coating can be used.
- a pump for feeding the coating liquid there are a defoaming device for degassing the coating liquid, and the like.
- the coated paper is produced through a normal drying process after providing a coating layer on the base paper, but may be smoothed by a surface treatment process or the like as necessary.
- the coated paper is dried and finished so that the water content of the coated paper after production is about 3 to 10% by weight, more preferably about 4 to 8% by weight.
- a smoothing processing apparatus such as a normal super calendar, gloss calendar, soft calendar, thermal calendar, shoe calendar, or the like can be used.
- the smoothing apparatus is appropriately used on-machine or off-machine, and the form of the pressure device, the number of pressure nips, heating, and the like are also adjusted as appropriate.
- the coating speed of curtain coating may be any speed, but is preferably 1000 m / min or less because more excellent effects are exhibited.
- the method for producing a coated paper for printing of the present invention can also be applied to paperboard such as white paperboard.
- Breaking time The temperature of the liquid is 30 ° C. between a pair of circular plates with a diameter of 8 mm (gap 3 mm) arranged coaxially and perpendicular to the axis in an extension viscometer (model name: CaBER1) manufactured by Thermo Harke.
- the coating liquid was sealed, the upper plate was pulled up and held vertically by 6 mm at a speed of 300 mm / second, and the time from the start of pulling up the plate to the breaking of the coating liquid filament was measured to determine the breaking time. .
- B-type viscosity No. 30 at 30 ° C. with a B-type viscometer manufactured by Tokyo Keiki Co., Ltd. Measurement was performed under the condition of 60 rpm using 4 rotors.
- Printing quality (Mottling): Printing was performed at a printing speed of 8000 sheets / hour using a flat-land printing ink (Hi-Unity M, manufactured by Toyo Ink) on a Roland offset flat printing machine (4 colors). Then, the halftone motto ring (implantation unevenness) was visually evaluated according to the following criteria. A: Very good, B: Good, B: Slightly inferior, X: Inferior
- Printing surface feeling (print glossiness, printing surface feeling): A printing speed of 8000 using an ink for flat printing (High Unity M manufactured by Toyo Ink) on a Roland offset flat printing machine (4 colors). After printing per sheet / hour, the print glossiness, ink fillability, and printing surface feeling in the solid portion were synthesized and visually evaluated according to the following criteria. A: Very good, B: Good, B: Slightly inferior, X: Inferior
- Printing strength Print glossiness: Printed at a printing speed of 8000 sheets / hour using a flat-land printing ink (high unity Y manufactured by Toyo Ink) on a Roland offset flat-type printing machine (two colors). After that, the degree of swelling (picking) of the solid portion was evaluated according to the following criteria. ⁇ : No missing, ⁇ : Little missing, ⁇ : Some missing, ⁇ : Many missing
- Example 1 Preparation of coating solution
- a pigment slurry made of heavy calcium carbonate (trade name: FMT-97, manufactured by Phimatech Co., Ltd.) having an average particle diameter of 1.0 ⁇ m and an oblateness ratio of 1.0, 100 parts by weight of the pigment is prepared.
- styrene / butadiene copolymer latex (trade name: PA7082, manufactured by Nippon A & L Co., Ltd.), non-alkali thickening type viscosity improver (trade name: SN thickener 929S, manufactured by San Nopco, molecular weight 600,000) 0.1 part by weight, surfactant (trade name: Newcol 2308LY, manufactured by Nippon Emulsifier Co., Ltd.) 0.2 part by weight, printability improver (trade name: SPI-106N, manufactured by Sumika Chemtex Co., Ltd.) 0.25 part by weight After that, a coating solution having a solid content concentration of 66% by weight was prepared. The viscosity of the coating solution was 2250 mPa ⁇ s, and the breaking time was 553 ms.
- the above-mentioned coating liquid is coated on a high-quality base paper (basis weight 66.5 g / m 2 ) at a coating speed of 900 m / min with a curtain coating apparatus so that the coating amount is 12 g / m 2 per side, and is dried. To obtain a coated paper for printing.
- Example 2 A coated paper for printing was obtained in the same manner as in Example 1 except that the coating speed was 1200 m / min.
- Example 3 A coated paper for printing was obtained in the same manner as in Example 1 except that the blending amount of the viscosity improver was 0.2 parts by weight and a coating solution having a solid content concentration of 58% by weight was finally prepared.
- the coating solution had a viscosity of 1019 mPa ⁇ s and a breaking time of 1593 ms.
- Example 4 Instead of 0.1 parts by weight of non-alkali thickening type viscosity improver, 2 parts by weight of oxidized acetylated tapioca starch (trade name: Genesize 80, manufactured by GSL), alkali thickening type viscosity improver (trade name: Somalex) 270, manufactured by Somar Co., Ltd., molecular weight 950,000) 0.2 parts by weight, except that a coating solution having a solid content concentration of 64% by weight was finally prepared. Obtained. The viscosity of the coating solution was 1330 mPa ⁇ s, and the breaking time was 737 ms.
- Example 5 A coated paper for printing was obtained in the same manner as in Example 4 except that the coating speed was 1200 m / min.
- Example 6 Instead of 0.1 part by weight of the non-alkali thickening type viscosity improver, 0.1 part by weight of the alkali thickening type viscosity improver (trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000) was used.
- a coated paper for printing was obtained in the same manner as in Example 1 except that a coating solution having a solid content concentration of 66% by weight was finally prepared.
- the viscosity of the coating solution was 2300 mPa ⁇ s, and the breaking time was 505 ms.
- Example 7 Instead of a non-alkali thickening type viscosity improver, 0.2 parts by weight of an alkali thickening type viscosity improver (trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000) was used, and finally solid A coated paper for printing was obtained in the same manner as in Example 1 except that a coating solution having a partial concentration of 62% by weight was prepared. The viscosity of the coating solution was 1300 mPa ⁇ s, and the breaking time was 1495 ms.
- an alkali thickening type viscosity improver trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000
- Example 8 A coated paper for printing was obtained in the same manner as in Example 7 except that the coating speed was 1200 m / min.
- Example 9 In the production of the coated paper of Example 6, 100 parts by weight of causticized light calcium carbonate having an average particle size of 1.2 ⁇ m as a pigment, urea phosphate esterified starch (trade name: PLV500, manufactured by Sanwa Starch Co., Ltd.) ) 17.5 parts by weight of styrene / butadiene copolymer latex (trade name: SL-14, manufactured by Nippon Paper Chemicals Co., Ltd.) 6.5 parts by weight of the coating solution by a gate roll coater 9 g / m 2 (both sides) ) A coated paper for printing was obtained in the same manner as in Example 6 except that an undercoated base paper (basis weight 80 g / m 2 ) was used.
- the causticized light calcium carbonate was produced according to a conventional method.
- Example 10 Instead of a non-alkali thickening type viscosity improver, 0.4 parts by weight of an alkali thickening type viscosity improver (trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000) was used, and finally solid A coated paper for printing was obtained in the same manner as in Example 1 except that a coating solution having a partial concentration of 54% by weight was prepared. The viscosity of the coating solution was 1021 mPa ⁇ s, and the breaking time was 574 ms.
- an alkali thickening type viscosity improver trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000
- Example 11 Instead of heavy calcium carbonate, fine kaolin (trade name: Hydra Gloss, manufactured by KaMin) having an average particle size of 0.2 ⁇ m and an aspect ratio of 0.8 is used as a pigment, and finally a solid content concentration of 68 wt. %, A coated paper for printing was obtained in the same manner as in Example 6 except that a coating solution was prepared. The viscosity of the coating solution was 2430 mPa ⁇ s, and the breaking time was 580 ms.
- Fine kaolin trade name: Hydra Gloss, manufactured by KaMin
- Example 12 As a pigment, 50 parts by weight of heavy calcium carbonate (trade name: FMT-97, manufactured by Phimatech Co., Ltd.) having an average particle size of 1.0 ⁇ m and an oblateness of 1.0, an average particle size of 0.2 ⁇ m and an oblateness of 0. For printing in the same manner as in Example 6, except that 50 parts by weight of fine kaolin (trade name: Hydra Gloss, manufactured by KaMin Co.) No. 8 was used and a coating solution having a solid content concentration of 67% by weight was finally prepared. Coated paper was obtained. The viscosity of the coating solution was 2090 mPa ⁇ s, and the breaking time was 510 ms.
- Example 13 Instead of heavy calcium carbonate, engineered kaolin (trade name: Capim DG, manufactured by Imerys) with an average particle size of 2.6 ⁇ m and an aspect ratio of 2.9 is used as a pigment, and finally a solid content concentration of 67 A coated paper for printing was obtained in the same manner as in Example 6 except that a coating solution of wt% was prepared.
- the viscosity of the coating solution was 1114 mPa ⁇ s, and the breaking time was 720 ms.
- Example 14 As a pigment, 50 parts by weight of heavy calcium carbonate (trade name: FMT-97, manufactured by Phimatech Co., Ltd.) having an average particle size of 1.0 ⁇ m and an oblateness of 1.0, an average particle size of 2.6 ⁇ m and an oblateness of 2. Printing was carried out in the same manner as in Example 6 except that 50 parts by weight of engineered kaolin (trade name: Capim DG, manufactured by Imerys) No. 9 was used and a coating solution having a solid content concentration of 67% by weight was finally prepared. Coated paper was obtained. The viscosity of the coating solution was 1250 mPa ⁇ s, and the breaking time was 620 ms.
- Example 15 Coated paper having three curtain coating layers (Preparation of coating solution)
- a pigment slurry made of heavy calcium carbonate (trade name: FMT-97, manufactured by Phimatech Co., Ltd.) having an average particle diameter of 1.0 ⁇ m and an oblateness ratio of 1.0, 100 parts by weight of the pigment is prepared.
- Alkali thickening type synthetic viscosity improver (trade name: SN thickener 641, manufactured by San Nopco, molecular weight 470,000) 0.2 parts, styrene-butadiene copolymer latex (trade name: PA7082, manufactured by Nippon A & L Co., Ltd.) After adding 13 parts, 0.2 part by weight of a surfactant (trade name: Newcol 2308LY, manufactured by Nippon Emulsifier Co., Ltd.) and 0.25 part by weight of a printability improver (trade name: SPI-106N, manufactured by Sumika Chemtex Co., Ltd.) The bottom layer coating solution having a solid content concentration of 60% by weight was prepared. The coating solution had a viscosity of 1220 mPa ⁇ s and a breaking time of 745 ms.
- Alkali thickening type synthetic viscosity improver (trade name: SN thickener 641, manufactured by San Nopco Co., Ltd., molecular weight 470,000) 0.2 part, 100 parts of pigment, styrene / butadiene copolymer latex (trade name: PA7082, An intermediate layer coating solution was obtained in the same manner as the lowermost layer coating solution except that the final solid content concentration was set to 63%.
- the viscosity of this coating solution was 1610 mPa ⁇ s, and the breaking time was 1660 ms.
- Alkali thickening type synthetic viscosity improver (trade name: SN thickener 641, manufactured by San Nopco, molecular weight 470,000) 0.2 parts, pigment 100 parts, styrene-butadiene copolymer latex (trade name: PA7082, Japan)
- a coating solution was obtained in the same manner as the lowermost layer coating solution except that 10 parts by A & L Co., Ltd. and the final solid content concentration was 61%.
- the viscosity of this coating solution was 1350 mPa ⁇ s, and the breaking time was 790 ms.
- a high-quality base paper (basis weight 66.5 g / m 2 ) with a sliding curtain coating device, a coating amount of 12 g / m 2 per side (lowermost layer: 2 g / m 2 , intermediate layer: 8 g / m 2 , The uppermost layer: 2 g / m 2 ) was applied with a curtain coating apparatus at a coating speed of 900 m / min, and dried to obtain a printing paper.
- Example 1 (Alkali thickening type viscosity improver)
- a coated paper for printing was obtained in the same manner as in Example 1 except that a coating liquid having a solid content concentration of 54% by weight was finally prepared.
- the viscosity of the coating solution was 821 mPa ⁇ s, and the breaking time was 374 ms.
- Example 3 (Alkali thickening type viscosity improver)
- an alkali thickening type viscosity improver (trade name: SN thickener 641, manufactured by San Nopco, molecular weight 470,000) 0
- a coated paper for printing was obtained in the same manner as in Example 1 except that .6 parts by weight was used and a coating solution having a solid content concentration of 62% by weight was finally prepared.
- the viscosity of the coating solution was 3667 mPa ⁇ s, and the breaking time was 2140 ms.
- Non-alkali thickening type viscosity improver (Non-alkali thickening type viscosity improver)
- a non-alkali thickening type viscosity improver (trade name: SN thickener 929S, manufactured by San Nopco, molecular weight 600,000) was used, and finally the solid content concentration A coated paper for printing was obtained in the same manner as in Example 1 except that a 54 wt% coating solution was prepared.
- the viscosity of the coating solution was 821 mPa ⁇ s, and the breaking time was 574 ms.
- Example 5 In the preparation of the coating liquid of Example 1, a non-alkali thickening-type viscosity improver was not added, and a coating liquid having a solid content concentration of 69% by weight was finally prepared in the same manner as in Example 1. A coated paper for printing was obtained. The viscosity of the coating solution was 1100 mPa ⁇ s, and the breaking time was 68 ms.
- Comparative Example 6 In the production of the coated paper of Comparative Example 5, a coated paper for printing was obtained in the same manner as Comparative Example 5 except that the coated base paper used in Example 9 was used.
- Example 7 A coated paper for printing was obtained in the same manner as in Example 6 except that a blade coating apparatus using a jet fountain system for supplying the coating liquid was used instead of the curtain coating apparatus.
Landscapes
- Paper (AREA)
Abstract
Description
(1)塗工液のカーテン膜に原紙を通して原紙上に塗工層を形成する印刷用塗工紙の製造方法であって、前記塗工液の破断時間が500ms以上であり、30℃におけるB型粘度が1000mPa・s~3000mPa・sであり、かつ、前記塗工液が、アクリル系単量体単位から主としてなる分子量40万以上の重合体を含有する粘性改良剤を含む、印刷用塗工紙の製造方法。前記粘性改良剤は、アルカリ増粘型または非アルカリ増粘型であることが好ましい。また、前記塗工液は、次式:
扁平率=BET法で求めた比表面積/レーザー回析式粒度分布から粒子が完全球体であると仮定して求めた比表面積
で示す扁平率が2.0以下である顔料を含有することが好ましい。
(2)塗工液の破断時間が500ms以上であり、30℃におけるB型粘度が1000mPa・s~3000mPa・sであり、かつ、前記塗工液が、アクリル系単量体単位から主としてなる分子量40万以上の重合体を含有する粘性改良剤を含む、印刷用塗工紙をカーテン塗工するための塗工液。
(3)前記塗工液をカーテン塗工によって原紙上に塗工した印刷用塗工紙。
本発明に用いる塗工液は、破断時間が500ms以上であり、30℃におけるB型粘度が1000~3000mPa・sである。このような特性を有するカーテン塗工液を用いることによって、特に高速塗工の際にもクレーターの発生を抑制することができる。
本発明で用いる粘性改良剤としては、アクリル系単量体単位から主としてなる分子量40万以上の重合体を含有する粘性改良剤が挙げられる。アクリル系単量体単位から主としてなる重合体とは、50重量%以上のアクリル系単量体単位からなる重合体をいう。重合体中のその余の単量体単位は、公知の単量体単位であってよい。
本発明において、カーテン塗工に供する塗工液は顔料を含んでなる。塗工液に配合する顔料に制限はなく、塗工紙用に従来から用いられている顔料を使用することができる。例えば、カオリン、クレー、重質炭酸カルシウム、軽質炭酸カルシウム、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、ケイ酸、ケイ酸塩、コロイダルシリカ、サチンホワイトなどの無機顔料、プラスチックピグメントなどの有機顔料、有機・無機複合顔料などを使用することができ、これらの顔料は必要に応じて単独または二種以上混合で使用することができる。
扁平率=BET法で求めた比表面積/レーザー回析式粒度分布から粒子が完全球体であると仮定して算出した比表面積
により示すことができる。扁平率の数値が高いほど顔料の扁平度が高く、扁平率の数値が1に近いほど顔料が完全球体に近いことを意味する。扁平率が2.0以下の顔料を用いると塗工紙品質が良好になる理由の詳細は明らかでなく限定されないが、以下のように考察できる。非接触式の塗工方式であるカーテン塗工は、接触式の塗工方式と比較して、扁平な顔料を使用した場合に顔料が原紙の進行方向へ配向し難い傾向があり、扁平な顔料を多く使用すると顔料が規則的に配向することができず、塗工紙表面の平滑性が低下し、また、塗工層の空隙が多くなり、印刷時におけるインキの浸透が激しくなり、印刷光沢度が低下すると考えられる。
シャープ度=(d30/d70)×100
[式中、d30は積算30重量%の粒子径であり、d70は積算70重量%の粒子径である]
で表される粒度分布のシャープ度が50以上である炭酸カルシウムを使用することが好ましい。このような炭酸カルシウムを顔料として使用すると、裏抜けに優れた印刷用塗工紙が得られる。
本発明においては、カーテン塗工液に接着剤(バインダー)を配合することが好ましい。使用する接着剤に特に制限はなく、塗工紙用に従来から用いられている接着剤を使用することができる。例えば、スチレン・ブタジエン系、スチレン・アクリル系、エチレン・酢酸ビニル系、ブタジエン・メチルメタクリレート系、酢酸ビニル・ブチルアクリレート系等の各種共重合およびポリビニルアルコール、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等の合成系接着剤;カゼイン、大豆蛋白、合成蛋白等の蛋白質類;酸化澱粉、陽性澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリン等の澱粉類;カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等の通常の塗工紙用接着剤1種類以上を適宜選択して使用することができる。これらの接着剤の中で、低重合度(重合度500程度)のポリビニルアルコールが、粘度を大幅に上昇させることなく接着効果も高めることができるために好ましい。
本発明においては、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、着色剤、界面活性剤等、通常の塗工紙用顔料に配合される各種助剤を適宜使用することも可能である。
本発明で使用される原紙に特に制限はなく、一般に使用される上質紙、中質紙、更紙、マシンコート紙、アート紙、キャストコート紙、合成紙、レジンコーテッド紙、プラスチックフィルム等を例外なく使用することができる。
本発明において、カーテン塗工層は1層以上であればよい。カーテン塗工層が多層である場合、本発明における特定の破断特性および粘度特性を有する塗工液は、いずれの層に用いてもよく、一層以上に用いられるが、原紙に接する最下層の塗工液または、最上層の塗工液として用いるのが好ましく、原紙に接する最下層の塗工液として用いることが最も好ましい。
本発明においてカーテン塗工とは、塗工液をカーテン状に流下させて膜を形成させ、その膜に原紙を通すことにより原紙上に塗工層を設ける塗工方式である。カーテン塗工は、原紙に沿って塗工層が形成される輪郭塗工であり、また、いわゆる前計量方式であるため塗工量の制御が容易であるという特徴を有する。
(1)破断時間:サーモハーケ社製伸長粘度計(機種名:CaBER1)において、同軸かつ軸が垂直となるように配置された一対の直径8mmの円形プレート間(ギャップ3mm)に液温が30℃の塗工液を封入し、上方のプレートを300mm/秒の速度で6mm垂直に引き上げそのまま保持し、前記プレートの引き上げ開始から塗工液フィラメントが破断するまでの時間を測定し、破断時間とした。
扁平率=BET法で求めた比表面積/レーザー回析式粒度分布から算出した粒子が完全球体であると仮定して算出した比表面積
◎:泡が全くない、○:泡がほとんどない、△:泡が少し残っている、×:泡が多く残っている
◎:クレーターが全くない、○:クレーターがほとんどない、△:クレーターが少ない、×:クレーターが多い
◎:非常に良好、○:良好、△:やや劣る、×:劣る
◎:非常に良好、○:良好、△:やや劣る、×:劣る
◎:全くムケがない、○:ムケがほとんどない、△:ムケが少しある、×:ムケが多い
(塗工液の調製)
顔料として、平均粒子径1.0μm、扁平率1.0である重質炭酸カルシウム(商品名:FMT-97、ファイマテック社製)からなる顔料スラリーを調製した後、顔料100重量部に対して、スチレン・ブタジエン共重合ラテックス(商品名:PA7082、日本エイアンドエル株式会社製)12重量部、非アルカリ増粘型の粘性改良剤(商品名:SNシックナー929S、サンノプコ株式会社製、分子量60万)0.1重量部、界面活性剤(商品名:Newcol2308LY、日本乳化剤株式会社製)0.2重量部、印刷適性向上剤(商品名:SPI-106N、住化ケムテックス株式会社製)0.25重量部を添加した後、固形分濃度が66重量%の塗工液を調製した。塗工液の粘度は2250mPa・sであり、破断時間は553msだった。
上質原紙(坪量66.5g/m2)に前記塗工液を片面あたり12g/m2の塗工量となるようにカーテン塗工装置にて塗工速度900m/分で塗工し、乾燥を行って印刷用塗工紙を得た。
塗工速度を1200m/分とした以外は、実施例1と同様に印刷用塗工紙を得た。
粘性改良剤の配合部数を0.2重量部とし、最終的に固形分濃度58重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1019mPa・s、破断時間は1593msだった。
非アルカリ増粘型の粘性改良剤0.1重量部の代わりに、酸化アセチル化タピオカ澱粉(商品名:Genesize80、GSL社製)2重量部、アルカリ増粘型の粘性改良剤(商品名:ソマレックス270、ソマール株式会社製、分子量95万)0.2重量部を用い、最終的に固形分濃度64重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1330mPa・s、破断時間は737msだった。
塗工速度を1200m/分とした以外は、実施例4と同様に印刷用塗工紙を得た。
非アルカリ増粘型の粘性改良剤0.1重量部の代わりに、アルカリ増粘型の粘性改良剤(商品名:SNシックナー641、サンノプコ株式会社製、分子量47万)0.1重量部を用い、最終的に固形分濃度66重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は2300mPa・s、破断時間は505msだった。
非アルカリ増粘型の粘性改良剤の代わりに、アルカリ増粘型の粘性改良剤(商品名:SNシックナー641、サンノプコ株式会社製、分子量47万)0.2重量部を用い、最終的に固形分濃度62重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1300mPa・sであり、破断時間は1495msだった。
塗工速度を1200m/分とした以外は、実施例7と同様に印刷用塗工紙を得た。
実施例6の塗工紙の製造において、上質原紙に、顔料として平均粒子径1.2μmの苛性化軽質炭酸カルシウム 100重量部、尿素リン酸エステル化澱粉(商品名:PLV500、三和澱粉社製) 17.5重量部、スチレン・ブタジエン共重合ラテックス(商品名:SL-14、日本製紙ケミカル株式会社製)6.5重量部からなる塗工液を、ゲートロールコーターで9g/m2(両面)下塗りした原紙(坪量80g/m2)を使用した以外は、実施例6と同様に印刷用塗工紙を得た。前記苛性化軽質炭酸カルシウムは、定法に従い製造した。
非アルカリ増粘型の粘性改良剤の代わりに、アルカリ増粘型の粘性改良剤(商品名:SNシックナー641、サンノプコ株式会社製、分子量47万)0.4重量部を用い、最終的に固形分濃度54重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1021mPa・sであり、破断時間は574msだった。
顔料として、重質炭酸カルシウムの代わりに、平均粒子径0.2μm、扁平率0.8である微粒カオリン(商品名:ハイドラグロス、KaMin社製)を使用し、最終的に固形分濃度68重量%の塗工液を調製した以外は、実施例6と同様に印刷用塗工紙を得た。塗工液の粘度は2430mPa・sであり、破断時間は580msだった。
顔料として、平均粒子径1.0μm、扁平率1.0である重質炭酸カルシウム(商品名:FMT-97、ファイマテック社製)50重量部と、平均粒子径0.2μm、扁平率0.8である微粒カオリン(商品名:ハイドラグロス、KaMin社製)50重量部を使用し、最終的に固形分濃度67重量%の塗工液を調製した以外は、実施例6と同様に印刷用塗工紙を得た。塗工液の粘度は2090mPa・sであり、破断時間は510msだった。
顔料として、重質炭酸カルシウムの代わりに、平均粒子径2.6μm、扁平率2.9であるエンジニアードカオリン(商品名:カピムDG、Imerys社製)を使用し、最終的に固形分濃度67重量%の塗工液を調製した以外は、実施例6と同様に印刷用塗工紙を得た。塗工液の粘度は1114mPa・s、破断時間は720msだった。
顔料として、平均粒子径1.0μm、扁平率1.0である重質炭酸カルシウム(商品名:FMT-97、ファイマテック社製)50重量部と、平均粒子径2.6μm、扁平率2.9であるエンジニアードカオリン(商品名:カピムDG、Imerys社製)50重量部を使用し、最終的に固形分濃度67重量%の塗工液を調製した以外は、実施例6と同様に印刷用塗工紙を得た。塗工液の粘度は1250mPa・s、破断時間は620msだった。
(塗工液の調製)
顔料として、平均粒子径1.0μm、扁平率1.0である重質炭酸カルシウム(商品名:FMT-97、ファイマテック社製)からなる顔料スラリーを調製した後、顔料100重量部に対して、アルカリ増粘型の合成粘性改良剤(商品名:SNシックナー641、サンノプコ株式会社製、分子量47万)0.2部、スチレン・ブタジエン共重合ラテックス(商品名:PA7082、日本エイアンドエル株式会社製)13部、界面活性剤(商品名:Newcol2308LY、日本乳化剤社製)0.2重量部、印刷適性向上剤(商品名:SPI-106N、住化ケムテックス社製)0.25重量部を添加した後、固形分濃度が60重量%の最下層用塗工液を調整した。この塗工液の粘度は1220mPa・sであり、破断時間は745msだった。
上質原紙(坪量66.5g/m2)にスライド式のカーテン塗工装置にて、片面あたり12g/m2の塗工量(最下層:2g/m2、中間層:8g/m2、最上層:2g/m2)となるようにカーテン塗工装置にて塗工速度900m/分で塗工し、乾燥を行って印刷用工紙を得た。
実施例7の塗工液の調製において、最終的に固形分濃度54重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は821mPa・sであり、破断時間は374msだった。
粘性改良剤の代わりに、ヒドロキシエチルエーテル化澱粉(商品名:エチレックス2005、Tate&Lyle社製)4重量部を用い、最終的に固形分濃度66重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1000mPa・s、破断時間は277msだった。
実施例1の塗工液の調製において、非アルカリ増粘型の粘性改良剤の代わりに、アルカリ増粘型の粘性改良剤(商品名:SNシックナー641、サンノプコ株式会社製、分子量47万)0.6重量部を用い、最終的に固形分濃度62重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は3667mPa・sであり、破断時間は2140msだった。
実施例1の塗工液の調製において、非アルカリ増粘型の粘性改良剤(商品名:SNシックナー929S、サンノプコ社製、分子量60万)0.4重量部を用い、最終的に固形分濃度54重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は821mPa・sであり、破断時間は574msだった。
実施例1の塗工液の調製において、非アルカリ増粘型の粘性改良剤を添加せず、最終的に固形分濃度69重量%の塗工液を調製した以外は、実施例1と同様に印刷用塗工紙を得た。塗工液の粘度は1100mPa・sであり、破断時間は68msだった。
比較例5の塗工紙の作成において、実施例9で使用した塗工原紙を使用した以外は、比較例5と同様に印刷用塗工紙を得た。
カーテン塗工装置の代わりに、塗工液供給がジェットファウンテン方式であるブレード塗工装置を使用した以外は、実施例6と同様に印刷用塗工紙を得た。
Claims (6)
- 塗工液のカーテン膜に原紙を通して原紙上に塗工層を形成する印刷用塗工紙の製造方法であって、
前記塗工液の破断時間が500ms以上であり、30℃におけるB型粘度が1000mPa・s~3000mPa・sであり、かつ、
前記塗工液が、アクリル系単量体単位から主としてなる分子量40万以上の重合体を含有する粘性改良剤を含む、印刷用塗工紙の製造方法。 - 前記粘性改良剤が、アルカリ増粘型の粘性改良剤である、請求項1に記載の印刷用塗工紙の製造方法。
- 前記粘性改良剤が、非アルカリ増粘型の粘性改良剤である、請求項1に記載の印刷用塗工紙の製造方法。
- 前記塗工液が、以下の式:
扁平率=BET法で求めた比表面積/レーザー回析式粒度分布から粒子が完全球体であると仮定して求めた比表面積
で示す扁平率が2.0以下である顔料を含有する、請求項1~3のいずれか1項に記載の製造方法。 - 塗工液の破断時間が500ms以上であり、30℃におけるB型粘度が1000mPa・s~3000mPa・sであり、かつ、
前記塗工液が、アクリル系単量体単位から主としてなる分子量40万以上の重合体を含有する粘性改良剤を含む、印刷用塗工紙をカーテン塗工するための塗工液。 - 請求項5記載の塗工液をカーテン塗工によって原紙上に塗工した印刷用塗工紙。
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Cited By (7)
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JP2013204174A (ja) * | 2012-03-28 | 2013-10-07 | Nippon Paper Industries Co Ltd | 塗工白板紙およびその製造方法 |
JP2014198919A (ja) * | 2013-03-29 | 2014-10-23 | 日本製紙株式会社 | 顔料塗工紙の製造方法 |
JP2014227634A (ja) * | 2013-05-24 | 2014-12-08 | 北越紀州製紙株式会社 | 印刷用塗工紙 |
JP2016064534A (ja) * | 2014-09-24 | 2016-04-28 | 北越紀州製紙株式会社 | インクジェット印刷用紙 |
JP2016064533A (ja) * | 2014-09-24 | 2016-04-28 | 北越紀州製紙株式会社 | インクジェット印刷用紙 |
JP2017013261A (ja) * | 2015-06-29 | 2017-01-19 | 北越紀州製紙株式会社 | オンデマンドインクジェット印刷用紙 |
JP2017047583A (ja) * | 2015-09-01 | 2017-03-09 | 北越紀州製紙株式会社 | インクジェット記録用紙の製造方法 |
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JP2008513616A (ja) * | 2004-09-17 | 2008-05-01 | ビーエーエスエフ ソシエタス・ヨーロピア | 1回及び/又は数回塗被された基材を製造する方法 |
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JPH04361696A (ja) * | 1991-06-07 | 1992-12-15 | Jujo Paper Co Ltd | 印刷用塗工紙の製造方法 |
JP2005299068A (ja) * | 2004-03-17 | 2005-10-27 | Oji Paper Co Ltd | 印刷用塗工紙および印刷用塗工紙の製造方法 |
JP2008513616A (ja) * | 2004-09-17 | 2008-05-01 | ビーエーエスエフ ソシエタス・ヨーロピア | 1回及び/又は数回塗被された基材を製造する方法 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013204174A (ja) * | 2012-03-28 | 2013-10-07 | Nippon Paper Industries Co Ltd | 塗工白板紙およびその製造方法 |
JP2014198919A (ja) * | 2013-03-29 | 2014-10-23 | 日本製紙株式会社 | 顔料塗工紙の製造方法 |
JP2014227634A (ja) * | 2013-05-24 | 2014-12-08 | 北越紀州製紙株式会社 | 印刷用塗工紙 |
JP2016064534A (ja) * | 2014-09-24 | 2016-04-28 | 北越紀州製紙株式会社 | インクジェット印刷用紙 |
JP2016064533A (ja) * | 2014-09-24 | 2016-04-28 | 北越紀州製紙株式会社 | インクジェット印刷用紙 |
JP2017013261A (ja) * | 2015-06-29 | 2017-01-19 | 北越紀州製紙株式会社 | オンデマンドインクジェット印刷用紙 |
JP2017047583A (ja) * | 2015-09-01 | 2017-03-09 | 北越紀州製紙株式会社 | インクジェット記録用紙の製造方法 |
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