WO2018163795A1 - Coated paper - Google Patents
Coated paper Download PDFInfo
- Publication number
- WO2018163795A1 WO2018163795A1 PCT/JP2018/005848 JP2018005848W WO2018163795A1 WO 2018163795 A1 WO2018163795 A1 WO 2018163795A1 JP 2018005848 W JP2018005848 W JP 2018005848W WO 2018163795 A1 WO2018163795 A1 WO 2018163795A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- paper
- starch
- coated paper
- pigment
- coated
- Prior art date
Links
Images
Classifications
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
Definitions
- the present invention relates to coated paper.
- the present invention relates to a coated paper containing starch granules in a pigment coating layer.
- the coated paper for printing is widely used in the commercial field for the purpose of advertising and promotion such as flyers, catalogs, pamphlets and direct mail. Particularly in recent years, both printing and processing have become more and more complex, and the demand for printing paper has become more severe in an environment such as on-demand printing and machine speedup.
- Coated paper is used for various purposes such as books, posters, and wrapping paper. In any application, weight reduction is remarkable. Paper weight reduction is also demanded from the viewpoint of cost reduction such as material cost, warehouse storage cost, transportation cost, etc., and also from the aspect of ensuring the ease of transportation of consumers against recent lightweight media such as e-books and smartphones. Quality. In the world of coated paper for printing, in order to satisfy both the need for weight reduction and the high-class feeling of paper, there is an expectation for a bulky technology that reduces the weight while maintaining the paper thickness.
- Patent Document 1 describes that a paper is made bulky by adding a nonionic surfactant.
- Patent Document 2 discloses a coating liquid containing 10 to 50 parts by weight of starch per 100 parts by weight of pigment on a bulky base paper (density: 0.70 g / cm 3 or less) containing mechanical pulp. It has been proposed to produce a bulky printing paper by coating by a transfer method.
- Patent Document 3 discloses a bulky printing coating by applying a coating layer containing a pigment having a large particle diameter to a low-density base paper (density: 0.50 to 0.75 g / cm 3 or less). It has been proposed to produce paper.
- the technique of blending a surfactant described in Patent Document 1 to reduce the density of a base paper has a problem that the strength of the base paper, especially the interlayer strength of the base paper, is reduced. Further, in the technology for reducing the density of the base paper by blending the mechanical pulp according to Patent Document 2, the stiffness of the base paper is increased, and the cushioning property of the paper at the time of printing is lowered, and the printability may be lowered. Furthermore, as in Patent Document 3, when a pigment having a large particle size is used in the pigment coating layer, the pigment having a large particle size is easily removed from the coating layer, and the pigment particles have no cushioning property. There were problems such as insufficient strength and deterioration of the printing surface.
- Japanese Patent Application Laid-Open No. 2007-303048 proposes further applying special starch particles processed with silicone on the pigment coating layer in order to reduce ink rubbing of the matte coated paper for printing.
- a surface layer containing coarse starch particles is further coated on the pigment coating layer, the starch particles are exposed on the coated paper surface, and defects (holes) are formed on the coated paper surface due to the dropping of the starch particles. ) May be possible.
- an object of the present invention is to provide a bulky coated paper excellent in printability.
- this invention includes the following aspect.
- a coated paper for printing having a pigment coating layer containing starch granules and a white pigment and a base paper.
- the stained starch particles having a diameter of 2 to 50 ⁇ m
- the coated paper according to any one of (1) to (5), wherein the number is 1 to 300 pieces / 1 mm 2 .
- bulky coated coated paper can be produced by adding uncooked starch granules to the pigment coated layer.
- FIG. 1 is a graph showing the particle size distribution of starch particles used in the examples.
- FIG. 2 is a photograph when the number of starch particles on the surface of the coated paper according to Sample 1-5 was measured.
- FIG. 3 is a graph showing the particle size distribution of starch particles on the surface of the coated paper according to Sample 1-5.
- FIG. 4 is a photograph of a cross section containing starch particles observed with an electron microscope for the coated paper according to Sample 1-5.
- starch granules are used for the pigment coating layer.
- starch is applied to a base paper or a coating layer using starch, which has been subjected to a steaming process in which heat is applied in the presence of water to gelatinize the starch granules, as a binder.
- granular starch is used for pigment coating. Used for construction layers. Examples of granular starch include starch that has not been cooked and starch that has been shaped into granules after cooking. ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the density of the coating layer of the coating paper for printing, the printability of coated paper can be improved.
- the coated paper of the present invention is not particularly limited as long as the pigment coated layer containing a white pigment is provided on the base paper, and printing used for offset printing, gravure printing, letterpress printing, inkjet printing, and the like.
- white paperboard having a pigment coating layer on the paperboard base paper may be used.
- the coated paper of the present invention has one or more pigment coating layers on the base paper, but may have two or more pigment coating layers.
- the number of pigment coating layers is not particularly limited, but it is preferably 3 layers or less in consideration of weight reduction of paper.
- the coated paper of the present invention may have a pigment coating layer only on one side of the base paper, or may have a pigment coating layer on both sides of the base paper. In addition, it is not necessary to apply the coating liquid (size press liquid) which does not contain a pigment on the base paper.
- the coating amount of the coated paper in the present invention can be appropriately selected depending on the application, but in general, the solid content per side is 2 to 20 g / m 2 , and may be 4 to 19 g / m 2 . It may be 6 to 18 g / m 2 or 8 to 17 g / m 2 .
- the pigment (white pigment) used in the coating layer of the present invention is not particularly limited, and those conventionally used for coated paper can be used, for example, kaolin, clay, engineered kaolin, delaminator.
- Ted clay heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, satin white and other inorganic pigments and solid, hollow or core shell
- Organic pigments such as molds can be used alone or in admixture of two or more as required.
- kaolin or clay from the viewpoint of reducing paper smoothness and ink rubbing, the amount of binder required is small, surface strength can be improved with a small amount of adhesive, and high whiteness.
- heavy calcium carbonate and light calcium carbonate are preferable, and from the viewpoint of improving opacity, light calcium carbonate having a uniform particle diameter and shape is particularly preferable. This is because the bulky coating layer structure scatters light efficiently.
- the content of light calcium carbonate, heavy calcium carbonate, or both is preferably 50 parts by mass or more per 100 parts by mass of pigment, more preferably 70 parts by mass or more, and 80 More preferred is part by mass or more.
- the average particle diameter of the coating pigment is 0.2 to 5 ⁇ m as measured by a laser diffraction particle size distribution measuring machine. Preferably, 0.2 to 3 ⁇ m is more preferable.
- any commonly used coater may be used.
- An on-machine coater or an off-machine coater may be used, and if it is an on-machine coater, a roll coater such as a size press coater, a gate roll coater, a rod metering size press coater, a bill blade coater, a blade metering size press coater, a short dwell blade
- a coater such as a coater or a jet fountain blade coater can be used.
- the coating speed is not particularly limited, but is preferably, for example, 150 to 2000 m / min, and more preferably 400 to 1500 m / min. With current technology, 150 to 1800 m / min for blade coaters and 150 to 2000 m / min for size press coaters are preferred.
- the method for drying the wet coating layer is not limited, and various methods such as a steam superheated cylinder, a heated hot air air dryer, a gas heater dryer, an electric heater dryer, and an infrared heater dryer may be used alone or in combination. it can.
- granular starch is used for the pigment coating layer.
- starch when starch is cooked, the grains collapse, but in the present invention, uncooked granular starch (starch granules) or starch granules formed into granules after cooking is used.
- Starch refers to a mixture composed of amylose and amylopectin, and generally the mixing ratio varies depending on the plant that is the raw material of starch.
- various processed starches and dextrins can be suitably used.
- the average particle diameter of the starch granules is preferably 8 to 25 ⁇ m, more preferably 10 to 20 ⁇ m, in terms of median diameter (d50) measured by a laser diffraction particle size distribution analyzer such as Mastersizer S manufactured by Malvern. More preferably, it is 12 to 17 ⁇ m.
- the median diameter is a diameter in which the large side and the small side are equal when the powder is divided into two from a certain particle diameter. In the present invention, the median diameter based on volume is used. Can do.
- the particle diameter distribution range can be measured by, for example, laser diffraction, and preferably 90% of the starch particles are distributed to 50 ⁇ m or less, more preferably 2 to 50 ⁇ m, and even more preferably. Is distributed in the range of 5 to 30 ⁇ m, and most preferably in the range of 5 to 25 ⁇ m.
- the starch of the present invention is not particularly limited as long as it is a granular starch granule, and the modification method, raw material varieties, and the like are also free.
- modified starch, modified starch, and the like include oxidized starch, hydroxyesterified starch (HES), phosphate starch, esterified starch, and dextrin.
- HES hydroxyesterified starch
- phosphate starch esterified starch
- dextrin dextrin
- corn, a potato, tapioca etc. can be mentioned as a preferable raw material of the starch used by this invention.
- the compounding amount of the starch granules in the present invention is 0.5 to 10% with respect to the total of the white pigment and the starch granules constituting one layer of the pigment coating layer, and more preferably 8% or less. It may be 5% or less.
- the starch granules of the present invention may be contained in any layer, but in order to exert the effects of the present invention greatly, the outermost pigment coating farthest from the base paper is used. It is preferable to make it contain in a construction layer. When starch particles are contained in the outermost coating layer, it is possible to greatly reduce the problem of ink rubbing that occurs when the coated papers immediately after printing are overlaid. Even when contained in a layer other than the outermost pigment coating layer, a bulky coated paper can be obtained.
- Adhesive in the present invention, an adhesive conventionally used for coated paper can be used.
- the adhesive used for the pigment coating layer include various copolymers such as styrene / butadiene, styrene / acryl, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and polyvinyl alcohol.
- Synthetic adhesives such as maleic anhydride copolymer and acrylic acid / methyl methacrylate copolymer; proteins such as casein, soy protein, synthetic protein; oxidized starch, positive starch, urea phosphated starch, hydroxy Examples include etherified starch such as ethyl etherified starch and starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose.
- One or more types of adhesives can be appropriately selected and used. In the present invention, it is preferable to use a starch polymer compound and latex as an adhesive. Combined use provides both the advantages of starch compounds and latex.
- the content of the adhesive in the pigment coating layer is preferably 5 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the pigment.
- the content thereof is preferably 1 part by mass or more and 15 parts by mass or less, and more preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the pigment. Even when blended in an amount of more than 15 parts by mass, the printing surface strength is excellent, but the cost is high and further effects cannot be expected.
- 1 to 15 weight part is preferable, More preferably, it is 1 to 10 weight part.
- the innermost pigment coating layer close to the base paper preferably has a higher latex content than the starch polymer, and the outermost pigment coating layer farthest from the base paper.
- the layer preferably has more starch-based polymer than latex.
- the method for preparing the coating liquid is not particularly limited and can be appropriately adjusted depending on the type of coater.
- the solid content concentration of the coating liquid is preferably 40 to 75% by weight, more preferably 50 to 72% by weight, and may be 60 to 69% by weight.
- the viscosity of the coating solution is preferably 300 to 2000 mPa ⁇ s, more preferably 500 to 1500 mPa ⁇ s, when measured with a JIS K 71117-1 B-type viscometer.
- various assistants to be blended in ordinary coated paper pigments such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, colorants, fluorescent whitening agents, etc. Agents can be used as appropriate.
- the coated paper of the present invention has a base paper layer.
- a base paper can be manufactured by a well-known method, for example, a paper-making raw material (paper material) can be made in a wire part, and then it can be used for a press part and a pre-dryer part to manufacture a base paper.
- the base paper used in the present invention may be single-layer paper or multi-layer paper, but when producing white paperboard, it is preferable to use multi-layer paper.
- the method for producing the base paper of the present invention is not particularly limited, and can be performed by a known method using known raw materials.
- the base paper used in the present invention is not particularly limited, and generally used high-quality paper, medium-quality paper, paperboard, reprinted paper, machine-coated paper, art paper, cast-coated paper, synthetic paper, resin-coated paper, plastic film, etc. Can be used without exception.
- chemical pulp can be used as the pulp raw material used for the base paper of the present invention.
- chemical pulp hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP) can be suitably used.
- various pulps can be used depending on the application, for example, deinked pulp (DIP), groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemithermo. Examples include mechanical pulp (CTMP), chemi-ground pulp (CGP), and semi-chemical pulp (SCP).
- CMP mechanical pulp
- CGP chemi-ground pulp
- SCP semi-chemical pulp
- the deinked pulp it is possible to use deinked pulp made from selected waste paper such as high quality paper, medium quality paper, lower grade paper, newspaper, flyers, magazines, etc., or unselected waste paper mixed with these.
- known fillers can be arbitrarily used as fillers for base paper, such as heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, deramikaolin, white Amorphous produced by neutralization of carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, sodium silicate Inorganic fillers such as silica and organic fillers such as urea-formalin resin, melamine resin, polystyrene resin, phenol resin can be used alone or in combination.
- base paper such as heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, deramikaolin, white Amorphous produced by neutralization of carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, aluminum hydroxide
- heavy calcium carbonate and light calcium carbonate which are typical fillers for neutral papermaking and alkaline papermaking, are preferably used to improve opacity.
- the filler content in the paper is not particularly limited, but is preferably 1 to 40 solids by mass, more preferably 5 to 35 solids by mass, and even more preferably 10 to 30 solids by mass.
- a known paper additive can be used.
- sulfuric acid bands and various anionic, cationic, nonionic or amphoteric yield improvers, drainage improvers, various paper strength enhancers and internal additive sizing agents, etc. Can be used.
- the dry paper strength improver include polyacrylamide and cationized starch
- examples of the wet paper strength improver include polyamidoamine epichlorohydrin.
- a bulking agent may be added to the base paper. These chemicals are added within a range that does not affect the formation and operability.
- neutral sizing agents include alkyl ketene dimers, alkenyl succinic anhydrides, and neutral rosin sizing agents.
- dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be added as necessary.
- the paper making method of the base paper in the present invention is not particularly limited, and a long paper machine including a top wire, an on-top former, a gap former, a round paper machine, a long paper machine and a round paper machine are used in combination. Paper board machine, Yankee dryer machine, etc., and may be single-layer or multi-layer.
- the pH during papermaking may be acidic, neutral or alkaline, but neutral or alkaline is preferred.
- the paper making speed is not particularly limited.
- the basis weight of the base paper of the present invention is not particularly limited and can be appropriately selected depending on the application.
- the basis weight of the base paper may be 25 to 160 g / m 2 , 35 to 150 g / m 2 , or 45 to 140 g / m 2 for general printing coated paper. If so, it may be 200 g / m 2 or more.
- the base paper used for the coated paper of the present invention may have a clear (transparent) coating layer on one side or both sides.
- a clear (transparent) coating layer By applying clear coating on the base paper, the surface strength and smoothness of the base paper can be improved, and the coating property when applying pigment can be improved.
- the aforementioned adhesive can be used as a binder in the clear coating layer.
- the amount of the clear coating is preferably 0.1 ⁇ 4.0g / m 2 by solid per side content, more preferably 0.5 ⁇ 2.5g / m 2.
- clear coating means, for example, various starches such as starch and oxidized starch using a coater (coating machine) such as a size press, a gate roll coater, a pre-metering size press, a curtain coater, and a spray coater.
- a coating liquid surface treatment liquid mainly composed of a water-soluble polymer such as polyacrylamide or polyvinyl alcohol is applied (size press) on a base paper.
- the treatment linear pressure is preferably 30 to 100 kN / m, more preferably 50 to 100 kN / m.
- the moisture content of the base paper during the precalender treatment is also important, and the moisture content is preferably 3 to 5%.
- the coated paper produced as described above may be surface-treated as necessary, but it is difficult to obtain the bulky effect of the present invention, and therefore it is preferable not to perform calendar treatment.
- 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 apparatus, the number of pressure nips, heating, and the like are appropriately adjusted, but calendering at low pressure is preferable.
- the coated paper of the present invention can correspond to various printing methods, such as coated paper for offset printing, coated paper for letterpress printing, coated paper for gravure printing, inkjet paper, dry electrophotographic paper, wet electronic paper. Can be used for photographic paper.
- the coated paper according to the present invention uses starch particles in the pigment coating layer. However, if the coarse starch particles are exposed too much on the coated paper surface, the starch particles may fall off. It becomes easy. Based on the JAPAN TAPPI paper pulp test method No.
- the number of stained starch particles having a diameter of 2 to 50 ⁇ m is 1 to 300 pieces / 1 mm 2 is preferable, 2 to 200 pieces / 1 mm 2 is more preferable, 3 to 150 pieces / 1 mm 2 is further preferable, 4 to 100 pieces / 1 mm 2 is further more preferable, and 5 to 50 pieces / 1 mm 2 are more preferable. It may be 2 .
- Evaluation method (1) Paper quality / basis weight: Measured according to JIS P 8124. -Paper thickness / density: Measured according to JIS P 8118. Ash content: Measured according to ISO 1762-1974.
- Average particle size and particle size distribution of starch particles The average particle size (d50) and particle size distribution of starch particles were measured by laser diffraction. Specifically, starch particles were analyzed using Mastersizer S manufactured by Malvern.
- FIG. 1 shows the particle size distribution of starch particles measured using Mastersizer S (laser diffraction particle size distribution measuring machine) manufactured by Malvern.
- Experiment 1 Production of coated paper (two-layer coating) On base paper having a basis weight of 75 g / m 2, the pigment coating layer dry coating amount per side is 6.5 g / m 2 (under layer), dry coating amount per one side 10.5 g / A coated paper for printing provided with a pigment coating layer (top layer: outermost coating layer) of m 2 was produced (samples 1-1 to 1-7, basis weight: about 109 g / m 2 ).
- Base paper A high quality paper having a basis weight of 98 g / m 2 and a density of 0.73 g / cm 3 was used as a base paper.
- the pulp blend was 100% chemical pulp (LBKP 100% by weight) and contained 13% by weight light calcium carbonate as a filler.
- an under pigment coating solution is coated on both sides with a blade coater at a coating speed of 650 m / min so that the dry coating amount per side is 6.5 g / m 2, and then dried and undercoated.
- a construction layer was provided on the base paper.
- top coating As coating pigment, heavy calcium carbonate slurry and starch particles (Y-3P manufactured by Nippon Corn Starch Co., Ltd., uncooked) were used in the amounts shown in the table below, and styrene was used as an adhesive for 100 parts by weight (solid content) of pigment. -Blending 4 parts by weight of butadiene copolymer latex (PB9501 manufactured by A & L) and 6 parts by weight of steamed oxidized starch (SK200 manufactured by Nippon Corn Starch Co., Ltd.) and adding water to top coating with a solid content concentration of 66% by weight A pigment coating solution was obtained.
- PB9501 manufactured by A & L butadiene copolymer latex
- SK200 steamed oxidized starch
- the top coating pigment coating solution is coated on both sides with a blade coater so that the dry coating amount per side is 10.5 g / m 2, and then dried for printing. Wrought paper was obtained (Samples 1-1 to 1-6).
- Sample 1-7 was produced as a coated paper in which starch particles were blended in the under layer.
- the coating used for the under coating was the same as Sample 1-6, except that 90 parts by weight of heavy calcium carbonate and 10 parts by weight of starch particles (Y-3P manufactured by Nippon Cornstarch, uncooked) were used.
- Y-3P manufactured by Nippon Cornstarch, uncooked were used.
- sample was used except that the heavy calcium carbonate used for the under layer and the top layer was replaced with light calcium carbonate, and starch particles (Y-3P, uncooked by Nippon Corn Starch Co., Ltd.) were used for the under layer with the composition shown in the table below.
- starch particles Y-3P, uncooked by Nippon Corn Starch Co., Ltd.
- the pigment 53.5 parts by weight of heavy calcium carbonate slurry (solid content), 45 parts by weight of kaolin (solid content), 1.5 parts by weight of uncooked starch particles, and 100 parts by weight of the pigment, the adhesive
- 4 parts by weight of styrene / butadiene copolymer latex (PB9501 manufactured by A & L) and 6 parts by weight of steamed oxidized starch (SK200 manufactured by Nippon Corn Starch Co., Ltd.) were added, and water was added to give a pigment with a solid content concentration of 66% by weight. A working solution was obtained.
- this pigment coating solution was coated on both sides with a blade coater so that the dry coating amount per side was 15.0 g / m 2, and then dried to obtain a coated paper for printing. (Sample 2-1).
- a coated paper for printing was obtained in the same manner as in Sample 2-1, except that uncooked starch particles were not blended and the amount of heavy calcium carbonate was changed to 55 parts by weight (Sample 2-2: Comparative Example). .
- a coated paper for printing was produced in the same manner as Sample 2-1 and Sample 2-2 except that heavy calcium carbonate was replaced with light calcium carbonate (Samples 2-3 to 2-4).
- low-density coated coated paper could be obtained by adding uncooked starch granules to the pigment coated layer. Since the specific gravity of starch particles is smaller than that of inorganic pigments, the density of the pigment coating layer is reduced by blending the starch particles, and when the starch particles are blended in the outermost coating layer, the paper thickness is increased by the starch particles. Therefore, it is thought that the density of the coated paper is reduced as a whole.
- the coated paper for printing of the present invention had little ink rubbing after printing and was excellent in coating suitability.
- the unevenness of the coated paper surface increases due to the starch particles present near the surface of the coated paper, the contact area between the superimposed coated papers decreases, and the ink rub is reduced due to the cushioning properties of the starch particles. Conceivable.
- FIG. 2 shows a surface photograph when the surface of the coated paper according to Sample 1-5 is analyzed, and 11 starch granules having a diameter of 2 to 50 ⁇ m per 1.5 mm ⁇ 2.1 mm (per 1 mm 2 It was about 3.5). Further, as apparent from the cross-sectional photograph shown in FIG. 4, the coated paper according to the present invention does not expose the starch particles excessively by printing the starch particles in the pigment coating layer. In addition, it was a pigment coating layer in which starch particles hardly fall off.
Landscapes
- Paper (AREA)
Abstract
The present invention addresses the problem of providing a high-bulk coated paper with excellent printability. By incorporating starch grains in a pigment-coating layer on the basis of the invention, it is possible to produce a high-bulk coated printing paper with excellent printability.
Description
本発明は塗工紙に関する。特に、本発明は顔料塗工層中に澱粉粒を含有する塗工紙に関する。
The present invention relates to coated paper. In particular, the present invention relates to a coated paper containing starch granules in a pigment coating layer.
印刷用塗工紙は、チラシ、カタログ、パンフレット、ダイレクトメールなどの広告・宣伝を目的とした商業分野において広く用いられている。特に近年は、印刷・加工ともにますます複雑化し、オンデマンド印刷や機械の高速化などの環境下で、印刷用紙に対する要求は一層厳しくなってきている。
The coated paper for printing is widely used in the commercial field for the purpose of advertising and promotion such as flyers, catalogs, pamphlets and direct mail. Particularly in recent years, both printing and processing have become more and more complex, and the demand for printing paper has become more severe in an environment such as on-demand printing and machine speedup.
塗工紙は、書籍やポスター、包装紙など様々な用途に用いられるが、いずれの用途においても、軽量化志向が顕著である。紙の軽量化は、資材コスト、倉庫保管コスト、運搬コスト等の原価削減の面からも、近年の電子書籍やスマートフォンなどの軽量媒体に対抗した消費者の運搬容易性確保の面からも、求められている品質である。印刷用塗工紙の世界においても、このような軽量化のニーズと、用紙の高級感を両立するために、紙厚は維持したまま軽量化する嵩高技術に期待が集まっている。
Coated paper is used for various purposes such as books, posters, and wrapping paper. In any application, weight reduction is remarkable. Paper weight reduction is also demanded from the viewpoint of cost reduction such as material cost, warehouse storage cost, transportation cost, etc., and also from the aspect of ensuring the ease of transportation of consumers against recent lightweight media such as e-books and smartphones. Quality. In the world of coated paper for printing, in order to satisfy both the need for weight reduction and the high-class feeling of paper, there is an expectation for a bulky technology that reduces the weight while maintaining the paper thickness.
印刷用塗工紙の嵩高化技術(低密度化技術)としては、原紙を嵩高にする試みに加えて、顔料塗工層を嵩高にする試みも検討されてきた。原紙を嵩高にする技術として、例えば、特許文献1には、非イオン性の界面活性剤を添加することによって紙を嵩高化することが記載されている。また、特許文献2には、機械パルプを含有した嵩高な原紙(密度:0.70g/cm3以下)に、顔料100重量部あたり10~50重量部の澱粉類を含有する塗工液をフィルム転写方式で塗工することによって、嵩高な印刷用塗工紙を製造することが提案されている。さらに、特許文献3には、低密度の原紙(密度:0.50~0.75g/cm3以下)に大粒径の顔料を含む塗工層を塗工することによって嵩高な印刷用塗工紙を製造することが提案されている。
In addition to attempts to increase the bulk of the base paper, attempts to increase the bulk of the pigment coating layer have been studied as techniques for increasing the bulk of the coated paper for printing (a technique for reducing the density). As a technique for making a base paper bulky, for example, Patent Document 1 describes that a paper is made bulky by adding a nonionic surfactant. Patent Document 2 discloses a coating liquid containing 10 to 50 parts by weight of starch per 100 parts by weight of pigment on a bulky base paper (density: 0.70 g / cm 3 or less) containing mechanical pulp. It has been proposed to produce a bulky printing paper by coating by a transfer method. Furthermore, Patent Document 3 discloses a bulky printing coating by applying a coating layer containing a pigment having a large particle diameter to a low-density base paper (density: 0.50 to 0.75 g / cm 3 or less). It has been proposed to produce paper.
特許文献1に記載された界面活性剤を配合して原紙を低密度化する技術は、原紙の強度、特に原紙の層間強度が低下する問題があった。また、特許文献2に係る機械パルプを配合して原紙を低密度化する技術では、原紙のこわさが大きくなり、印刷時の紙のクッション性が低下して印刷適性が低下する場合があった。さらに、特許文献3のように、大粒径の顔料を顔料塗工層に用いた場合、大粒径の顔料が塗工層から脱落しやすく、また、顔料粒子にクッション性がないため、表面強度が不足したり、印刷面感が悪化したりするなどの課題があった。
The technique of blending a surfactant described in Patent Document 1 to reduce the density of a base paper has a problem that the strength of the base paper, especially the interlayer strength of the base paper, is reduced. Further, in the technology for reducing the density of the base paper by blending the mechanical pulp according to Patent Document 2, the stiffness of the base paper is increased, and the cushioning property of the paper at the time of printing is lowered, and the printability may be lowered. Furthermore, as in Patent Document 3, when a pigment having a large particle size is used in the pigment coating layer, the pigment having a large particle size is easily removed from the coating layer, and the pigment particles have no cushioning property. There were problems such as insufficient strength and deterioration of the printing surface.
また、特開2007-303048号公報には、印刷用艶消塗工紙のインキ擦れを低減するために、顔料塗工層の上に、シリコーン加工した特殊な澱粉粒子をさらに塗布することが提案されている。しかしながら、顔料塗工層上に、粗大な澱粉粒子を含む表面層をさらに塗布した場合、塗工紙表面上に澱粉粒子が露出しており、澱粉粒子の脱落によって塗工紙表面に欠陥(穴)ができるおそれがある。この方法では、澱粉粒子を含む表面層を別途塗布する必要があり、また、シリコーン加工した特殊な澱粉粒子が用いる必要があるため、操業面やコスト面において課題があった。
Japanese Patent Application Laid-Open No. 2007-303048 proposes further applying special starch particles processed with silicone on the pigment coating layer in order to reduce ink rubbing of the matte coated paper for printing. Has been. However, when a surface layer containing coarse starch particles is further coated on the pigment coating layer, the starch particles are exposed on the coated paper surface, and defects (holes) are formed on the coated paper surface due to the dropping of the starch particles. ) May be possible. In this method, it is necessary to separately apply a surface layer containing starch particles, and since special starch particles processed with silicone need to be used, there are problems in operation and cost.
このような状況に鑑み、本発明の課題は、印刷適性に優れた嵩高な塗工紙を提供することである。
In view of such a situation, an object of the present invention is to provide a bulky coated paper excellent in printability.
上記課題について鋭意検討したところ、印刷用塗工紙の顔料塗工層中に澱粉粒子を含有させることで、嵩高な印刷用塗工紙が得られることを見出し、本発明を完成させるに至った。これに限定されるものではないが、本発明は下記の態様を包含する。
(1) 澱粉粒と白色顔料を含む顔料塗工層と原紙を有する印刷用塗工紙。
(2) 前記澱粉粒の平均粒子径が8~25μmである、(1)に記載の塗工紙。
(3) 前記顔料塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、(1)または(2)に記載の塗工紙。
(4) 前記塗工紙が複数の顔料塗工層を有しており、前記澱粉粒が少なくとも最外塗工層に存在する、(1)~(3)のいずれかに記載の塗工紙。
(5) 前記最外塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、(4)に記載の塗工紙。
(6) JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を用いて塗工紙の白紙サンプルを気化染色した場合、直径が2~50μmの大きさの染色された澱粉粒子の数が、1~300個/1mm2である、(1)~(5)のいずれかに記載の塗工紙。 As a result of intensive studies on the above problems, it was found that a bulky printing paper can be obtained by adding starch particles in the pigment coating layer of the printing paper, and the present invention has been completed. . Although not limited to this, this invention includes the following aspect.
(1) A coated paper for printing having a pigment coating layer containing starch granules and a white pigment and a base paper.
(2) The coated paper according to (1), wherein the starch granules have an average particle size of 8 to 25 μm.
(3) The coated paper according to (1) or (2), wherein the weight ratio of starch granules to the total of starch granules and white pigment constituting the pigment coating layer is 0.5 to 10%.
(4) The coated paper according to any one of (1) to (3), wherein the coated paper has a plurality of pigment coated layers, and the starch granules are present at least in the outermost coated layer. .
(5) The coated paper according to (4), wherein the weight ratio of the starch granules to the total of the starch granules and the white pigment constituting the outermost coating layer is 0.5 to 10%.
(6) Based on the JAPAN TAPPI paper pulp test method No. 47, when a white paper sample of coated paper is vapor-dyed using an iodine solution (quantitative method), the stained starch particles having a diameter of 2 to 50 μm The coated paper according to any one of (1) to (5), wherein the number is 1 to 300 pieces / 1 mm 2 .
(1) 澱粉粒と白色顔料を含む顔料塗工層と原紙を有する印刷用塗工紙。
(2) 前記澱粉粒の平均粒子径が8~25μmである、(1)に記載の塗工紙。
(3) 前記顔料塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、(1)または(2)に記載の塗工紙。
(4) 前記塗工紙が複数の顔料塗工層を有しており、前記澱粉粒が少なくとも最外塗工層に存在する、(1)~(3)のいずれかに記載の塗工紙。
(5) 前記最外塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、(4)に記載の塗工紙。
(6) JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を用いて塗工紙の白紙サンプルを気化染色した場合、直径が2~50μmの大きさの染色された澱粉粒子の数が、1~300個/1mm2である、(1)~(5)のいずれかに記載の塗工紙。 As a result of intensive studies on the above problems, it was found that a bulky printing paper can be obtained by adding starch particles in the pigment coating layer of the printing paper, and the present invention has been completed. . Although not limited to this, this invention includes the following aspect.
(1) A coated paper for printing having a pigment coating layer containing starch granules and a white pigment and a base paper.
(2) The coated paper according to (1), wherein the starch granules have an average particle size of 8 to 25 μm.
(3) The coated paper according to (1) or (2), wherein the weight ratio of starch granules to the total of starch granules and white pigment constituting the pigment coating layer is 0.5 to 10%.
(4) The coated paper according to any one of (1) to (3), wherein the coated paper has a plurality of pigment coated layers, and the starch granules are present at least in the outermost coated layer. .
(5) The coated paper according to (4), wherein the weight ratio of the starch granules to the total of the starch granules and the white pigment constituting the outermost coating layer is 0.5 to 10%.
(6) Based on the JAPAN TAPPI paper pulp test method No. 47, when a white paper sample of coated paper is vapor-dyed using an iodine solution (quantitative method), the stained starch particles having a diameter of 2 to 50 μm The coated paper according to any one of (1) to (5), wherein the number is 1 to 300 pieces / 1 mm 2 .
本発明に基づいて顔料塗工層に未蒸煮の澱粉粒を含有させることによって、嵩高な印刷用塗工紙を製造することができる。
According to the present invention, bulky coated coated paper can be produced by adding uncooked starch granules to the pigment coated layer.
本発明においては、澱粉粒を顔料塗工層に用いる。一般に、澱粉は水存在下で熱を加え、澱粉粒を糊化する蒸煮工程を経たスラリーとした澱粉をバインダーとして原紙や塗工層に用いられるが、本発明においては、粒状の澱粉を顔料塗工層に使用する。粒状の澱粉としては、蒸煮していない澱粉や、蒸煮後粒状に成形した澱粉などが挙げられる。本発明によれば、印刷用塗工紙の塗工層を低密度化できるとともに、塗工紙の印刷適性を向上させることができる。
In the present invention, starch granules are used for the pigment coating layer. In general, starch is applied to a base paper or a coating layer using starch, which has been subjected to a steaming process in which heat is applied in the presence of water to gelatinize the starch granules, as a binder. In the present invention, granular starch is used for pigment coating. Used for construction layers. Examples of granular starch include starch that has not been cooked and starch that has been shaped into granules after cooking. ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the density of the coating layer of the coating paper for printing, the printability of coated paper can be improved.
本発明の塗工紙は、白色顔料を含む顔料塗工層が原紙上に設けられた塗工紙であれば特に制限はなく、オフセット印刷、グラビア印刷、凸版印刷、インクジェット印刷などに用いられる印刷用塗工紙はもちろん、板紙原紙上に顔料塗工層を有する白板紙であってもよい。本発明の塗工紙は、原紙の上に顔料塗工層を1層以上有しているが、2層以上の顔料塗工層を有していてもよい。顔料塗工層の数は特に制限されないが、紙の軽量化を考慮すると3層以下であることが好ましい。また、本発明の塗工紙は、原紙の片面のみに顔料塗工層を有していても、原紙の両面に顔料塗工層を有していてもよい。なお、原紙上には、顔料を含まない塗工液(サイズプレス液)を塗工しても塗工しなくてもよい。
The coated paper of the present invention is not particularly limited as long as the pigment coated layer containing a white pigment is provided on the base paper, and printing used for offset printing, gravure printing, letterpress printing, inkjet printing, and the like. Of course, white paperboard having a pigment coating layer on the paperboard base paper may be used. The coated paper of the present invention has one or more pigment coating layers on the base paper, but may have two or more pigment coating layers. The number of pigment coating layers is not particularly limited, but it is preferably 3 layers or less in consideration of weight reduction of paper. Further, the coated paper of the present invention may have a pigment coating layer only on one side of the base paper, or may have a pigment coating layer on both sides of the base paper. In addition, it is not necessary to apply the coating liquid (size press liquid) which does not contain a pigment on the base paper.
本発明における塗工紙の塗工量は、用途に応じて適宜選定できるが、一般的には、片面あたり固形分で2~20g/m2であり、4~19g/m2としてもよく、6~18g/m2や8~17g/m2であってもよい。
The coating amount of the coated paper in the present invention can be appropriately selected depending on the application, but in general, the solid content per side is 2 to 20 g / m 2 , and may be 4 to 19 g / m 2 . It may be 6 to 18 g / m 2 or 8 to 17 g / m 2 .
本発明の塗工層に用いる顔料(白色顔料)は特に制限されず、塗工紙用に従来から用いられているものを使用することができ、例えば、カオリン、クレー、エンジニアードカオリン、デラミネーテッドクレー、重質炭酸カルシウム、軽質炭酸カルシウム、タルク、二酸化チタン、硫酸バリウム、硫酸カルシウム、酸化亜鉛、珪酸、珪酸塩、コロイダルシリカ、サチンホワイトなどの無機顔料および密実型、中空型、またはコアーシェル型などの有機顔料などを必要に応じて単独または2種類以上混合して使用することができる。また、顔料の種類としては、紙の平滑性やインキ擦れを低減する観点からはカオリンまたはクレーを含有することが好ましく、バインダー要求量が少なく少量の接着剤で表面強度を向上できることと、高い白色度、更に印刷時のインキの乾燥性の観点からは、重質炭酸カルシウムおよび軽質炭酸カルシウムが好ましく、また不透明度をも向上させる観点から、粒子径や形状が揃った軽質炭酸カルシウムが特に好ましい。嵩高な塗工層構造は光を効率的に散乱するためである。
The pigment (white pigment) used in the coating layer of the present invention is not particularly limited, and those conventionally used for coated paper can be used, for example, kaolin, clay, engineered kaolin, delaminator. Ted clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicate, colloidal silica, satin white and other inorganic pigments and solid, hollow or core shell Organic pigments such as molds can be used alone or in admixture of two or more as required. In addition, as a kind of pigment, it is preferable to contain kaolin or clay from the viewpoint of reducing paper smoothness and ink rubbing, the amount of binder required is small, surface strength can be improved with a small amount of adhesive, and high whiteness. From the viewpoint of the degree of drying and the drying property of the ink at the time of printing, heavy calcium carbonate and light calcium carbonate are preferable, and from the viewpoint of improving opacity, light calcium carbonate having a uniform particle diameter and shape is particularly preferable. This is because the bulky coating layer structure scatters light efficiently.
塗工層に炭酸カルシウムを用いる場合、軽質炭酸カルシウムもしくは重質炭酸カルシウム、またはその両方をあわせた含有量は、顔料100質量部あたり50質量部以上が好ましく、70質量部以上がより好ましく、80質量部以上がさらに好ましい。また、原紙上に均一な塗工層を形成させる観点および印刷時の乾燥性の点から塗工顔料の平均粒子径は、レーザー回折式粒度分布測定機で測定した値で0.2~5μmが好ましく、0.2~3μmがより好ましい。
When calcium carbonate is used for the coating layer, the content of light calcium carbonate, heavy calcium carbonate, or both is preferably 50 parts by mass or more per 100 parts by mass of pigment, more preferably 70 parts by mass or more, and 80 More preferred is part by mass or more. Further, from the viewpoint of forming a uniform coating layer on the base paper and the drying property at the time of printing, the average particle diameter of the coating pigment is 0.2 to 5 μm as measured by a laser diffraction particle size distribution measuring machine. Preferably, 0.2 to 3 μm is more preferable.
本発明においては、通常用いられるコーターであればいずれを用いても良い。オンマシンコーターでもオフマシンコーターでも良く、オンマシンコーターであれば、サイズプレスコーター、ゲートロールコーター、ロッドメタリングサイズプレスコーターなどのロールコーター、ビルブレイドコーター、ブレードメタリングサイズプレスコーター、ショートドゥエルブレードコーター、ジェットファウンテンブレードコーターなどのコーターを使用できる。塗工速度は、特に限定されないが、例えば、150~2000m/分とすることが好ましく、400~1500m/分がより好ましい。現在の技術ではブレードコーターでは150~1800m/分、サイズプレスコーターでは150~2000m/分が好ましい。
In the present invention, any commonly used coater may be used. An on-machine coater or an off-machine coater may be used, and if it is an on-machine coater, a roll coater such as a size press coater, a gate roll coater, a rod metering size press coater, a bill blade coater, a blade metering size press coater, a short dwell blade A coater such as a coater or a jet fountain blade coater can be used. The coating speed is not particularly limited, but is preferably, for example, 150 to 2000 m / min, and more preferably 400 to 1500 m / min. With current technology, 150 to 1800 m / min for blade coaters and 150 to 2000 m / min for size press coaters are preferred.
本発明において、湿潤塗工層を乾燥させる方法に制限はなく、例えば蒸気過熱シリンダ、加熱熱風エアドライヤ、ガスヒータードライヤ、電気ヒータードライヤ、赤外線ヒータードライヤ等各種の方法が単独もしくは併用して用いることができる。
In the present invention, the method for drying the wet coating layer is not limited, and various methods such as a steam superheated cylinder, a heated hot air air dryer, a gas heater dryer, an electric heater dryer, and an infrared heater dryer may be used alone or in combination. it can.
澱粉粒
本発明においては、顔料塗工層に粒状の澱粉を使用する。一般に澱粉は蒸煮すると粒が崩壊するが、本発明においては、未蒸煮の粒状の澱粉(澱粉粒)や、蒸煮後に粒状に成形された澱粉粒を用いる。澱粉とは、アミロース、アミロペクチンからなる混合物のことをいい、一般に、その混合比は澱粉の原材料である植物によって異なる。澱粉としては、各種加工澱粉やデキストリンを好適に使用することができる。 In the present invention, granular starch is used for the pigment coating layer. In general, when starch is cooked, the grains collapse, but in the present invention, uncooked granular starch (starch granules) or starch granules formed into granules after cooking is used. Starch refers to a mixture composed of amylose and amylopectin, and generally the mixing ratio varies depending on the plant that is the raw material of starch. As the starch, various processed starches and dextrins can be suitably used.
本発明においては、顔料塗工層に粒状の澱粉を使用する。一般に澱粉は蒸煮すると粒が崩壊するが、本発明においては、未蒸煮の粒状の澱粉(澱粉粒)や、蒸煮後に粒状に成形された澱粉粒を用いる。澱粉とは、アミロース、アミロペクチンからなる混合物のことをいい、一般に、その混合比は澱粉の原材料である植物によって異なる。澱粉としては、各種加工澱粉やデキストリンを好適に使用することができる。 In the present invention, granular starch is used for the pigment coating layer. In general, when starch is cooked, the grains collapse, but in the present invention, uncooked granular starch (starch granules) or starch granules formed into granules after cooking is used. Starch refers to a mixture composed of amylose and amylopectin, and generally the mixing ratio varies depending on the plant that is the raw material of starch. As the starch, various processed starches and dextrins can be suitably used.
本発明において澱粉粒の平均粒子径は、Malvern社製Mastersizer Sなどのレーザー回折式粒度分布測定機で測定したメジアン径(d50)が8~25μmであることが好ましく、10~20μmがより好ましく、12~17μmがさらに好ましい。ここで、メジアン径とは、粉体をある粒子径から2つに分けたとき、大きい側と小さい側が等量となる径のことであり、本発明においては体積基準でのメジアン径を用いることができる。また、粒子径の分布範囲は、例えば、レーザー回折によって測定することができ、好ましくは澱粉粒子の90%が50μm以下に分布しており、より好ましくは2~50μmに分布しており、さらに好ましくは5~30μmに分布しており、最も好ましくは5~25μmに分布している。
In the present invention, the average particle diameter of the starch granules is preferably 8 to 25 μm, more preferably 10 to 20 μm, in terms of median diameter (d50) measured by a laser diffraction particle size distribution analyzer such as Mastersizer S manufactured by Malvern. More preferably, it is 12 to 17 μm. Here, the median diameter is a diameter in which the large side and the small side are equal when the powder is divided into two from a certain particle diameter. In the present invention, the median diameter based on volume is used. Can do. The particle diameter distribution range can be measured by, for example, laser diffraction, and preferably 90% of the starch particles are distributed to 50 μm or less, more preferably 2 to 50 μm, and even more preferably. Is distributed in the range of 5 to 30 μm, and most preferably in the range of 5 to 25 μm.
本発明の澱粉は、粒状の澱粉粒であれば特に制限されず、変性方法、原料の品種なども自由である。澱粉を変性、修飾、加工などしたものとしては、例えば、酸化澱粉、ヒドロキシエステル化澱粉(HES)、燐酸エステル澱粉、エステル化澱粉、デキストリンなどが挙げられる。また、本発明で使用する澱粉の好ましい原料としては、トウモロコシ、ポテト、タピオカなどを挙げることができる。
The starch of the present invention is not particularly limited as long as it is a granular starch granule, and the modification method, raw material varieties, and the like are also free. Examples of modified starch, modified starch, and the like include oxidized starch, hydroxyesterified starch (HES), phosphate starch, esterified starch, and dextrin. Moreover, as a preferable raw material of the starch used by this invention, corn, a potato, tapioca etc. can be mentioned.
本発明における澱粉粒の配合量は、好ましい態様において、顔料塗工層1層を構成する白色顔料と澱粉粒の合計に対して0.5~10%であるが、8%以下がより好ましく、5%以下としてもよい。また、2層以上の顔料塗工層を設ける場合、本発明の澱粉粒はいずれの層に含有させてもよいが、本発明の効果を大きく発揮させるには、原紙から最も遠い最外顔料塗工層に含有させることが好ましい。最外塗工層に澱粉粒子を含有させた場合、印刷直後の塗工紙を重ねあわせた際に発生するインキ擦れの問題を大きく低減することができる。最外顔料塗工層以外の層に含有させた場合においても、嵩高な塗工紙を得ることができる。
In a preferred embodiment, the compounding amount of the starch granules in the present invention is 0.5 to 10% with respect to the total of the white pigment and the starch granules constituting one layer of the pigment coating layer, and more preferably 8% or less. It may be 5% or less. When two or more pigment coating layers are provided, the starch granules of the present invention may be contained in any layer, but in order to exert the effects of the present invention greatly, the outermost pigment coating farthest from the base paper is used. It is preferable to make it contain in a construction layer. When starch particles are contained in the outermost coating layer, it is possible to greatly reduce the problem of ink rubbing that occurs when the coated papers immediately after printing are overlaid. Even when contained in a layer other than the outermost pigment coating layer, a bulky coated paper can be obtained.
接着剤
本発明においては、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。顔料塗工層に用いる接着剤としては、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体、ポリビニルアルコール、無水マレイン酸共重合体、およびアクリル酸・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等のエーテル化澱粉、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などが挙げられる。接着剤は、1種類以上を適宜選択して使用できる。本発明では、澱粉系高分子化合物とラテックスを接着剤として併用することが好ましい。併用により澱粉系化合物とラテックスの利点を両方得られる。 Adhesive In the present invention, an adhesive conventionally used for coated paper can be used. Examples of the adhesive used for the pigment coating layer include various copolymers such as styrene / butadiene, styrene / acryl, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and polyvinyl alcohol. , Synthetic adhesives such as maleic anhydride copolymer and acrylic acid / methyl methacrylate copolymer; proteins such as casein, soy protein, synthetic protein; oxidized starch, positive starch, urea phosphated starch, hydroxy Examples include etherified starch such as ethyl etherified starch and starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose. One or more types of adhesives can be appropriately selected and used. In the present invention, it is preferable to use a starch polymer compound and latex as an adhesive. Combined use provides both the advantages of starch compounds and latex.
本発明においては、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。顔料塗工層に用いる接着剤としては、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体、ポリビニルアルコール、無水マレイン酸共重合体、およびアクリル酸・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等のエーテル化澱粉、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などが挙げられる。接着剤は、1種類以上を適宜選択して使用できる。本発明では、澱粉系高分子化合物とラテックスを接着剤として併用することが好ましい。併用により澱粉系化合物とラテックスの利点を両方得られる。 Adhesive In the present invention, an adhesive conventionally used for coated paper can be used. Examples of the adhesive used for the pigment coating layer include various copolymers such as styrene / butadiene, styrene / acryl, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, and polyvinyl alcohol. , Synthetic adhesives such as maleic anhydride copolymer and acrylic acid / methyl methacrylate copolymer; proteins such as casein, soy protein, synthetic protein; oxidized starch, positive starch, urea phosphated starch, hydroxy Examples include etherified starch such as ethyl etherified starch and starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxymethyl cellulose. One or more types of adhesives can be appropriately selected and used. In the present invention, it is preferable to use a starch polymer compound and latex as an adhesive. Combined use provides both the advantages of starch compounds and latex.
本発明において、顔料塗工層における接着剤の含有量は、顔料100重量部に対して5重量部以上20重量部以下が好ましい。ラテックスを使用する場合、その含有量は顔料100質量部に対して好ましくは1質量部以上15質量部以下であり、更に好ましくは1質量部以上10質量部以下である。15質量部より多く配合した場合においても印刷表面強度に優れるが、コストがかかる上、それ以上の効果が期待できない。また、接着剤として澱粉系高分子を使用する場合、1重量部以上15重量部以下が好ましく、さらに好ましくは1重量部以上10重量部以下である。また、2層以上の顔料塗工層を設ける場合は、原紙に近い最内顔料塗工層は澱粉系高分子よりもラテックスの含有量が多いことが好ましく、原紙から最も遠い最外顔料塗工層は、ラテックスよりも澱粉系高分子が多いことが好ましい。
In the present invention, the content of the adhesive in the pigment coating layer is preferably 5 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the pigment. When using latex, the content thereof is preferably 1 part by mass or more and 15 parts by mass or less, and more preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the pigment. Even when blended in an amount of more than 15 parts by mass, the printing surface strength is excellent, but the cost is high and further effects cannot be expected. Moreover, when using a starch type polymer as an adhesive agent, 1 to 15 weight part is preferable, More preferably, it is 1 to 10 weight part. When two or more pigment coating layers are provided, the innermost pigment coating layer close to the base paper preferably has a higher latex content than the starch polymer, and the outermost pigment coating layer farthest from the base paper. The layer preferably has more starch-based polymer than latex.
本発明において、塗工液の調製方法は特に限定されず、コーターの種類によって適宜調整できる。これに限定されるものではないが、塗工液の固形分濃度は40~75重量%が好ましく、50~72重量%がより好ましく、60~69重量%としてもよい。塗工液の粘度は、JIS K 7117-1のB型粘度計で測定した場合、300~2000mPa・sが好ましく、500~1500mPa・sがより好ましい。
In the present invention, the method for preparing the coating liquid is not particularly limited and can be appropriately adjusted depending on the type of coater. Although not limited thereto, the solid content concentration of the coating liquid is preferably 40 to 75% by weight, more preferably 50 to 72% by weight, and may be 60 to 69% by weight. The viscosity of the coating solution is preferably 300 to 2000 mPa · s, more preferably 500 to 1500 mPa · s, when measured with a JIS K 71117-1 B-type viscometer.
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、蛍光増白剤等、通常の塗工紙用顔料に配合される各種助剤を適宜使用できる。
In the present invention, various assistants to be blended in ordinary coated paper pigments such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, colorants, fluorescent whitening agents, etc. Agents can be used as appropriate.
原紙
本発明の塗工紙は原紙層を有する。原紙は公知の方法により製造することができ、例えば、抄紙原料(紙料)をワイヤーパートにて抄紙し、次いでプレスパート、プレドライヤーパートに供して原紙を製造することができる。本発明に用いる原紙は、単層抄きであっても多層抄きであってもよいが、白板紙を製造する場合は多層抄き原紙を用いることが好ましい。本発明の原紙の製法は特に制限されず、公知の原料を用いて公知の方法によることができる。本発明で使用される原紙は特に制限されず、一般に使用される上質紙、中質紙、板紙、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できる。 Base Paper The coated paper of the present invention has a base paper layer. A base paper can be manufactured by a well-known method, for example, a paper-making raw material (paper material) can be made in a wire part, and then it can be used for a press part and a pre-dryer part to manufacture a base paper. The base paper used in the present invention may be single-layer paper or multi-layer paper, but when producing white paperboard, it is preferable to use multi-layer paper. The method for producing the base paper of the present invention is not particularly limited, and can be performed by a known method using known raw materials. The base paper used in the present invention is not particularly limited, and generally used high-quality paper, medium-quality paper, paperboard, reprinted paper, machine-coated paper, art paper, cast-coated paper, synthetic paper, resin-coated paper, plastic film, etc. Can be used without exception.
本発明の塗工紙は原紙層を有する。原紙は公知の方法により製造することができ、例えば、抄紙原料(紙料)をワイヤーパートにて抄紙し、次いでプレスパート、プレドライヤーパートに供して原紙を製造することができる。本発明に用いる原紙は、単層抄きであっても多層抄きであってもよいが、白板紙を製造する場合は多層抄き原紙を用いることが好ましい。本発明の原紙の製法は特に制限されず、公知の原料を用いて公知の方法によることができる。本発明で使用される原紙は特に制限されず、一般に使用される上質紙、中質紙、板紙、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できる。 Base Paper The coated paper of the present invention has a base paper layer. A base paper can be manufactured by a well-known method, for example, a paper-making raw material (paper material) can be made in a wire part, and then it can be used for a press part and a pre-dryer part to manufacture a base paper. The base paper used in the present invention may be single-layer paper or multi-layer paper, but when producing white paperboard, it is preferable to use multi-layer paper. The method for producing the base paper of the present invention is not particularly limited, and can be performed by a known method using known raw materials. The base paper used in the present invention is not particularly limited, and generally used high-quality paper, medium-quality paper, paperboard, reprinted paper, machine-coated paper, art paper, cast-coated paper, synthetic paper, resin-coated paper, plastic film, etc. Can be used without exception.
本発明の原紙に用いるパルプ原料としては、化学パルプを使用することができる。化学パルプとしては、広葉樹晒クラフトパルプ(LBKP)、針葉樹晒クラフトパルプ(NBKP)を好適に使用することができる。化学パルプ以外にも、用途に応じて各種パルプを使用することができ、例えば、脱墨パルプ(DIP)、砕木パルプ(GP)、リファイナー砕木パルプ(RGP)、サーモメカニカルパルプ(TMP)、ケミサーモメカニカルパルプ(CTMP)、ケミグランドパルプ(CGP)、セミケミカルパルプ(SCP)などが挙げられる。脱墨パルプとしては、上質紙、中質紙、下級紙、新聞紙、チラシ、雑誌などの選別古紙やこれらが混合している無選別古紙を原料とする脱墨パルプなどを使用することができる。
As the pulp raw material used for the base paper of the present invention, chemical pulp can be used. As the chemical pulp, hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP) can be suitably used. In addition to chemical pulp, various pulps can be used depending on the application, for example, deinked pulp (DIP), groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemithermo. Examples include mechanical pulp (CTMP), chemi-ground pulp (CGP), and semi-chemical pulp (SCP). As the deinked pulp, it is possible to use deinked pulp made from selected waste paper such as high quality paper, medium quality paper, lower grade paper, newspaper, flyers, magazines, etc., or unselected waste paper mixed with these.
本発明においては、原紙の填料として公知の填料を任意に使用でき、例えば、重質炭酸カルシム、軽質炭酸カルシウム、クレー、シリカ、軽質炭酸カルシウム-シリカ複合物、カオリン、焼成カオリン、デラミカオリン、ホワイトカーボン、タルク、炭酸マグネシウム、炭酸バリウム、硫酸バリウム、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛、酸化亜鉛、酸化チタン、ケイ酸ナトリウムの鉱産による中和で製造される非晶質シリカ等の無機填料や、尿素-ホルマリン樹脂、メラミン系樹脂、ポリスチレン樹脂、フェノール樹脂などの有機填料を単用又は併用できる。この中でも、中性抄紙やアルカリ抄紙における代表的な填料である重質炭酸カルシウムや軽質炭酸カルシウムが不透明度向上のためにも好ましく使用される。紙中填料率は特に制限されないが、1~40固形分質量%が好ましく、5~35固形分質量%がより好ましく、10~30固形分質量%がさらに好ましい。
In the present invention, known fillers can be arbitrarily used as fillers for base paper, such as heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, deramikaolin, white Amorphous produced by neutralization of carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, sodium silicate Inorganic fillers such as silica and organic fillers such as urea-formalin resin, melamine resin, polystyrene resin, phenol resin can be used alone or in combination. Among these, heavy calcium carbonate and light calcium carbonate, which are typical fillers for neutral papermaking and alkaline papermaking, are preferably used to improve opacity. The filler content in the paper is not particularly limited, but is preferably 1 to 40 solids by mass, more preferably 5 to 35 solids by mass, and even more preferably 10 to 30 solids by mass.
本発明においては、公知の製紙用添加剤を使用することができる。例えば、硫酸バンドや各種のアニオン性、カチオン性、ノニオン性あるいは、両性の歩留まり向上剤、濾水性向上剤、各種紙力増強剤や内添サイズ剤等の抄紙用内添助剤を必要に応じて使用することができる。乾燥紙力向上剤としてはポリアクリルアミド、カチオン化澱粉が挙げられ、湿潤紙力向上剤としてはポリアミドアミンエピクロロヒドリンなどが挙げられる。また、より高い嵩高効果を得るために、原紙に嵩高剤を添加してもよい。これらの薬品は地合や操業性などの影響の無い範囲で添加される。中性サイズ剤としてはアルキルケテンダイマーやアルケニル無水コハク酸、中性ロジンサイズ剤などが挙げられる。更に、染料、蛍光増白剤、pH調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤等も必要に応じて添加することができる。
In the present invention, a known paper additive can be used. For example, sulfuric acid bands and various anionic, cationic, nonionic or amphoteric yield improvers, drainage improvers, various paper strength enhancers and internal additive sizing agents, etc. Can be used. Examples of the dry paper strength improver include polyacrylamide and cationized starch, and examples of the wet paper strength improver include polyamidoamine epichlorohydrin. In order to obtain a higher bulking effect, a bulking agent may be added to the base paper. These chemicals are added within a range that does not affect the formation and operability. Examples of neutral sizing agents include alkyl ketene dimers, alkenyl succinic anhydrides, and neutral rosin sizing agents. Furthermore, dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be added as necessary.
本発明における原紙の抄紙方法は特に限定されるものではなく、トップワイヤー等を含む長網抄紙機、オントップフォーマー、ギャップフォーマ、丸網抄紙機、長網抄紙機と丸網抄紙機を併用した板紙抄紙機、ヤンキードライヤーマシン等を用いて行うことができ、単層抄きでも多層抄きでもよい。抄紙時のpHは、酸性、中性、アルカリ性のいずれでもよいが、中性またはアルカリ性が好ましい。抄紙速度は、特に限定されない。
The paper making method of the base paper in the present invention is not particularly limited, and a long paper machine including a top wire, an on-top former, a gap former, a round paper machine, a long paper machine and a round paper machine are used in combination. Paper board machine, Yankee dryer machine, etc., and may be single-layer or multi-layer. The pH during papermaking may be acidic, neutral or alkaline, but neutral or alkaline is preferred. The paper making speed is not particularly limited.
本発明の原紙の坪量は特に限定されず、用途に応じて適宜選定できる。例えば、原紙の坪量は、一般印刷用塗工紙であれば、25~160g/m2であってよく、35~150g/m2、45~140g/m2としてもよく、塗工白板紙であれば、200g/m2以上であってもよい。
The basis weight of the base paper of the present invention is not particularly limited and can be appropriately selected depending on the application. For example, the basis weight of the base paper may be 25 to 160 g / m 2 , 35 to 150 g / m 2 , or 45 to 140 g / m 2 for general printing coated paper. If so, it may be 200 g / m 2 or more.
本発明の塗工紙に用いる原紙は、その片面または両面にクリア(透明)塗工層を有していてもよい。原紙上にクリア塗工を施すことにより、原紙の表面強度や平滑性を向上させることができ、また、顔料塗工をする際の塗工性を向上させることができる。本発明においては、クリア塗工層にバインダーとして、前述の接着剤を使用することができる。クリア塗工の量は、片面あたり固形分で0.1~4.0g/m2が好ましく、0.5~2.5g/m2がより好ましい。
The base paper used for the coated paper of the present invention may have a clear (transparent) coating layer on one side or both sides. By applying clear coating on the base paper, the surface strength and smoothness of the base paper can be improved, and the coating property when applying pigment can be improved. In the present invention, the aforementioned adhesive can be used as a binder in the clear coating layer. The amount of the clear coating is preferably 0.1 ~ 4.0g / m 2 by solid per side content, more preferably 0.5 ~ 2.5g / m 2.
本発明においてクリア塗工とは、例えば、サイズプレス、ゲートロールコーター、プレメタリングサイズプレス、カーテンコーター、スプレーコーターなどのコーター(塗工機)を使用して、澱粉、酸化澱粉などの各種澱粉、ポリアクリルアミド、ポリビニルアルコールなどの水溶性高分子を主成分とする塗布液(表面処理液)を原紙上に塗布(サイズプレス)することをいう。
In the present invention, clear coating means, for example, various starches such as starch and oxidized starch using a coater (coating machine) such as a size press, a gate roll coater, a pre-metering size press, a curtain coater, and a spray coater. It means that a coating liquid (surface treatment liquid) mainly composed of a water-soluble polymer such as polyacrylamide or polyvinyl alcohol is applied (size press) on a base paper.
本発明においては、オンラインソフトカレンダー、オンラインチルドカレンダーなどにより塗工前の原紙にプレカレンダー処理を行い、原紙を予め平滑化しておくことが、塗工後の塗工層を均一化する上で好ましい。この場合、処理線圧は、好ましくは30~100kN/m、より好ましくは50~100kN/mである。また、プレカレンダー処理する際の原紙の水分率も重要であり、水分率は3~5%が好ましい。
In the present invention, it is preferable to perform pre-calendar processing on the base paper before coating by an online soft calendar, online chilled calendar, etc., and smooth the base paper in advance in order to make the coating layer after coating uniform. . In this case, the treatment linear pressure is preferably 30 to 100 kN / m, more preferably 50 to 100 kN / m. Further, the moisture content of the base paper during the precalender treatment is also important, and the moisture content is preferably 3 to 5%.
塗工紙表面
本発明においては、以上のように製造した塗工紙を必要に応じて表面処理してもよいが、本発明の嵩高効果が得にくくなるため、カレンダー処理を行わないことが好ましい。平滑化処理を行う場合は、通常のスーパーカレンダー、グロスカレンダー、ソフトカレンダー、熱カレンダー、シューカレンダー等の平滑化処理装置を用いることができる。平滑化処理装置は、オンマシンやオフマシンで適宜用いられ、加圧装置の形態、加圧ニップの数、加温等も適宜調整されるが、低圧でのカレンダー処理が好ましい。 Coated paper surface In the present invention, the coated paper produced as described above may be surface-treated as necessary, but it is difficult to obtain the bulky effect of the present invention, and therefore it is preferable not to perform calendar treatment. . When performing the smoothing process, 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 apparatus, the number of pressure nips, heating, and the like are appropriately adjusted, but calendering at low pressure is preferable.
本発明においては、以上のように製造した塗工紙を必要に応じて表面処理してもよいが、本発明の嵩高効果が得にくくなるため、カレンダー処理を行わないことが好ましい。平滑化処理を行う場合は、通常のスーパーカレンダー、グロスカレンダー、ソフトカレンダー、熱カレンダー、シューカレンダー等の平滑化処理装置を用いることができる。平滑化処理装置は、オンマシンやオフマシンで適宜用いられ、加圧装置の形態、加圧ニップの数、加温等も適宜調整されるが、低圧でのカレンダー処理が好ましい。 Coated paper surface In the present invention, the coated paper produced as described above may be surface-treated as necessary, but it is difficult to obtain the bulky effect of the present invention, and therefore it is preferable not to perform calendar treatment. . When performing the smoothing process, 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 apparatus, the number of pressure nips, heating, and the like are appropriately adjusted, but calendering at low pressure is preferable.
本発明の塗工紙は、種々の印刷方式に対応することができ、オフセット印刷用塗工紙、凸版印刷用塗工紙、グラビア印刷用塗工紙、インクジェット用紙、乾式電子写真用紙、湿式電子写真用紙などに使用することができる。
The coated paper of the present invention can correspond to various printing methods, such as coated paper for offset printing, coated paper for letterpress printing, coated paper for gravure printing, inkjet paper, dry electrophotographic paper, wet electronic paper. Can be used for photographic paper.
上述したように、本発明に係る塗工紙には、顔料塗工層に澱粉粒子を使用するが、粗大な澱粉粒子が塗工紙表面に露出しすぎていると澱粉粒子の脱落などが生じ易くなる。JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を用いて塗工紙の白紙サンプルを気化染色した場合、直径が2~50μmの大きさの染色された澱粉粒子の数が、1~300個/1mm2が好ましく、2~200個/1mm2がより好ましく、3~150個/1mm2がさらに好ましく、4~100個/1mm2がよりさらに好ましく、5~50個/1mm2としてもよい。
As described above, the coated paper according to the present invention uses starch particles in the pigment coating layer. However, if the coarse starch particles are exposed too much on the coated paper surface, the starch particles may fall off. It becomes easy. Based on the JAPAN TAPPI paper pulp test method No. 47, when a blank sample of coated paper is vapor-dyed using an iodine solution (quantitative method), the number of stained starch particles having a diameter of 2 to 50 μm is 1 to 300 pieces / 1 mm 2 is preferable, 2 to 200 pieces / 1 mm 2 is more preferable, 3 to 150 pieces / 1 mm 2 is further preferable, 4 to 100 pieces / 1 mm 2 is further more preferable, and 5 to 50 pieces / 1 mm 2 are more preferable. It may be 2 .
以下、具体的な実験例を挙げながら本発明をより詳細に説明するが、本発明は下記の実験例に限定されるものではない。また、特に断らない限り、本明細書において、数値範囲はその端点を含むものとして記載され、「部」及び「%」は、それぞれ「重量部」及び「重量%」を示す。
Hereinafter, the present invention will be described in more detail with specific experimental examples, but the present invention is not limited to the following experimental examples. In addition, unless otherwise specified, in this specification, a numerical range is described as including its end points, and “part” and “%” indicate “part by weight” and “% by weight”, respectively.
評価方法
(1)紙質
・坪量:JIS P 8124に準じて測定した。
・紙厚/密度:JIS P 8118に準じて測定した。
・灰分:ISO1762-1974に準じて測定した。 Evaluation method (1) Paper quality / basis weight: Measured according to JIS P 8124.
-Paper thickness / density: Measured according to JIS P 8118.
Ash content: Measured according to ISO 1762-1974.
(1)紙質
・坪量:JIS P 8124に準じて測定した。
・紙厚/密度:JIS P 8118に準じて測定した。
・灰分:ISO1762-1974に準じて測定した。 Evaluation method (1) Paper quality / basis weight: Measured according to JIS P 8124.
-Paper thickness / density: Measured according to JIS P 8118.
Ash content: Measured according to ISO 1762-1974.
(2)白紙光沢度(%)
JIS-P8142に基づいて測定した。 (2) Blank paper gloss (%)
Measurement was performed based on JIS-P8142.
JIS-P8142に基づいて測定した。 (2) Blank paper gloss (%)
Measurement was performed based on JIS-P8142.
(3)印刷光沢度(%)
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が藍1.60、紅1.50、黄1.10となる様に藍紅(CMY)の順に印刷した。得られた印刷物の藍紅黄(CMY)ベタ印刷部の光沢度を、JIS P-8142に基づいて測定した。 (3) Print glossiness (%)
Using offset sheet-fed ink (4 colors) manufactured by Roland, using offset sheet-fed ink (NEX-M manufactured by Toyo Ink Co., Ltd.), the ink density of the solid part is 1.60 indigo at a printing speed of 8000 sheets / hr. Printing was performed in the order of Crimson (CMY) so that the color was 1.50 and yellow 1.10. The glossiness of the indigo red (CMY) solid printed part of the obtained printed matter was measured based on JIS P-8142.
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が藍1.60、紅1.50、黄1.10となる様に藍紅(CMY)の順に印刷した。得られた印刷物の藍紅黄(CMY)ベタ印刷部の光沢度を、JIS P-8142に基づいて測定した。 (3) Print glossiness (%)
Using offset sheet-fed ink (4 colors) manufactured by Roland, using offset sheet-fed ink (NEX-M manufactured by Toyo Ink Co., Ltd.), the ink density of the solid part is 1.60 indigo at a printing speed of 8000 sheets / hr. Printing was performed in the order of Crimson (CMY) so that the color was 1.50 and yellow 1.10. The glossiness of the indigo red (CMY) solid printed part of the obtained printed matter was measured based on JIS P-8142.
(4)光沢度差(ポイント)
印刷光沢度から白紙光沢度を差し引いた値を光沢度差とし、光沢度差が20ポイント以上であれば印刷部と白紙部の光沢の差異が十分に得られており、視認しやすい印刷物となる。
・光沢度差=印刷光沢度(%)-白紙光沢度(%) (4) Gloss level difference (points)
The value obtained by subtracting the white paper glossiness from the print glossiness is defined as the glossiness difference. If the glossiness difference is 20 points or more, the difference in gloss between the printed part and the white paper part is sufficiently obtained, and the printed matter is easy to visually recognize. .
・ Glossiness difference = Printing glossiness (%)-Blank paper glossiness (%)
印刷光沢度から白紙光沢度を差し引いた値を光沢度差とし、光沢度差が20ポイント以上であれば印刷部と白紙部の光沢の差異が十分に得られており、視認しやすい印刷物となる。
・光沢度差=印刷光沢度(%)-白紙光沢度(%) (4) Gloss level difference (points)
The value obtained by subtracting the white paper glossiness from the print glossiness is defined as the glossiness difference. If the glossiness difference is 20 points or more, the difference in gloss between the printed part and the white paper part is sufficiently obtained, and the printed matter is easy to visually recognize. .
・ Glossiness difference = Printing glossiness (%)-Blank paper glossiness (%)
(5)印刷面感
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が墨1.80となる様に印刷したあと、墨ベタ印刷部の印刷面感を3段階で評価した。評価基準は下記のとおりであり、目視により評価した。
・3(○):印刷部にムラがみられない。
・2(△):印刷部にわずかなムラがみられるが、実用上問題無い。
・1(×):印刷部にムラが多くみられる。 (5) Feeling of printing Using offset sheet-fed printing machine (4 colors) manufactured by Roland, using offset sheet-fed ink (NEX-M manufactured by Toyo Ink), the ink density of the solid part at a printing speed of 8000 sheets / hr. After printing so that the ink was 1.80, the printing surface feeling of the black solid printing part was evaluated in three stages. Evaluation criteria are as follows and evaluated visually.
-3 (◯): No unevenness is observed in the printed part.
2 (Δ): Slight unevenness is observed in the printed part, but there is no practical problem.
1 (x): Many unevennesses are observed in the printing part.
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が墨1.80となる様に印刷したあと、墨ベタ印刷部の印刷面感を3段階で評価した。評価基準は下記のとおりであり、目視により評価した。
・3(○):印刷部にムラがみられない。
・2(△):印刷部にわずかなムラがみられるが、実用上問題無い。
・1(×):印刷部にムラが多くみられる。 (5) Feeling of printing Using offset sheet-fed printing machine (4 colors) manufactured by Roland, using offset sheet-fed ink (NEX-M manufactured by Toyo Ink), the ink density of the solid part at a printing speed of 8000 sheets / hr. After printing so that the ink was 1.80, the printing surface feeling of the black solid printing part was evaluated in three stages. Evaluation criteria are as follows and evaluated visually.
-3 (◯): No unevenness is observed in the printed part.
2 (Δ): Slight unevenness is observed in the printed part, but there is no practical problem.
1 (x): Many unevennesses are observed in the printing part.
(6)インキ擦れ
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が墨1.80となる様に印刷した。次いで、JIS P8111に基づき24時間調湿し、学振型摩擦堅牢度試験機により、墨ベタ印刷部が白紙部に合わさるように500gfの荷重をかけて1回擦り合わせ、白紙部に転移したインキを、インキ擦れとして5段階で目視評価した。
・5:インキの転移が全くない。
・4:インキの転移がほとんどない。
・3:わずかにインキの転移があるが、実用上問題がない。
・2:インキの転移が多い。
・1:インキの転移が非常に多い。 (6) Ink rubbing Using an offset sheet-fed ink (NEX-M manufactured by Toyo Ink Co., Ltd.) with an offset sheet-fed printing machine (4 colors) manufactured by Roland Co., Ltd. The ink was printed so that the ink was 1.80. Next, the ink was conditioned for 24 hours in accordance with JIS P8111 and rubbed once with a load of 500 gf so that the black solid print portion would fit the blank paper portion using the Gakushin type friction fastness tester, and transferred to the blank paper portion. Was visually evaluated in 5 stages as ink rubbing.
* 5: No ink transfer.
-4: Almost no ink transfer.
-3: There is a slight ink transfer, but there is no practical problem.
-2: There is much transfer of ink.
* 1: There are very many ink transfers.
ローランド社製オフセット枚葉印刷機(4色)にてオフセット枚葉用インキ(東洋インキ製NEX-M)を用い、印刷速度8000枚/hrでベタ部のインキ着肉濃度が墨1.80となる様に印刷した。次いで、JIS P8111に基づき24時間調湿し、学振型摩擦堅牢度試験機により、墨ベタ印刷部が白紙部に合わさるように500gfの荷重をかけて1回擦り合わせ、白紙部に転移したインキを、インキ擦れとして5段階で目視評価した。
・5:インキの転移が全くない。
・4:インキの転移がほとんどない。
・3:わずかにインキの転移があるが、実用上問題がない。
・2:インキの転移が多い。
・1:インキの転移が非常に多い。 (6) Ink rubbing Using an offset sheet-fed ink (NEX-M manufactured by Toyo Ink Co., Ltd.) with an offset sheet-fed printing machine (4 colors) manufactured by Roland Co., Ltd. The ink was printed so that the ink was 1.80. Next, the ink was conditioned for 24 hours in accordance with JIS P8111 and rubbed once with a load of 500 gf so that the black solid print portion would fit the blank paper portion using the Gakushin type friction fastness tester, and transferred to the blank paper portion. Was visually evaluated in 5 stages as ink rubbing.
* 5: No ink transfer.
-4: Almost no ink transfer.
-3: There is a slight ink transfer, but there is no practical problem.
-2: There is much transfer of ink.
* 1: There are very many ink transfers.
(7)塗工紙面上の澱粉粒子の個数
JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を調製し、白紙サンプルを気化染色した後、デジタルマイクロスコープ(キーエンス社製VHX-900を用いて、1.5mm×2.1mmの範囲内にある、直径が2~50μmの大きさの染色された澱粉粒の個数を計測した。200倍の倍率で4か所を測定し、その平均個数を算出した。 (7) Number of starch particles on the coated paper surface After preparing an iodine solution (quantitative method) based on JAPAN TAPPI paper pulp test method No. 47 and vapor-dyeing a blank paper sample, a digital microscope (VHX manufactured by Keyence Corporation) is used. Using 900, the number of stained starch granules having a diameter of 2 to 50 μm within the range of 1.5 mm × 2.1 mm was measured, measuring four places at a magnification of 200 times, The average number was calculated.
JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を調製し、白紙サンプルを気化染色した後、デジタルマイクロスコープ(キーエンス社製VHX-900を用いて、1.5mm×2.1mmの範囲内にある、直径が2~50μmの大きさの染色された澱粉粒の個数を計測した。200倍の倍率で4か所を測定し、その平均個数を算出した。 (7) Number of starch particles on the coated paper surface After preparing an iodine solution (quantitative method) based on JAPAN TAPPI paper pulp test method No. 47 and vapor-dyeing a blank paper sample, a digital microscope (VHX manufactured by Keyence Corporation) is used. Using 900, the number of stained starch granules having a diameter of 2 to 50 μm within the range of 1.5 mm × 2.1 mm was measured, measuring four places at a magnification of 200 times, The average number was calculated.
(8)澱粉粒子の平均粒子径および粒度分布
澱粉粒子の平均粒子径(d50)および粒度分布をレーザー回析によって測定した。具体的には、Malvern社製Mastersizer Sを用いて澱粉粒子を分析した。 (8) Average particle size and particle size distribution of starch particles The average particle size (d50) and particle size distribution of starch particles were measured by laser diffraction. Specifically, starch particles were analyzed using Mastersizer S manufactured by Malvern.
澱粉粒子の平均粒子径(d50)および粒度分布をレーザー回析によって測定した。具体的には、Malvern社製Mastersizer Sを用いて澱粉粒子を分析した。 (8) Average particle size and particle size distribution of starch particles The average particle size (d50) and particle size distribution of starch particles were measured by laser diffraction. Specifically, starch particles were analyzed using Mastersizer S manufactured by Malvern.
塗工紙の原材料
(原紙)
・化学パルプ:日本製紙製LBKP(広葉樹晒クラフトパルプ)
・軽質炭酸カルシウム:日本製紙製内添填料 Raw material of coated paper (base paper)
・ Chemical pulp: Nippon Paper Industries LBKP (hardwood bleached kraft pulp)
・ Light calcium carbonate: Nippon Paper's internal filler
(原紙)
・化学パルプ:日本製紙製LBKP(広葉樹晒クラフトパルプ)
・軽質炭酸カルシウム:日本製紙製内添填料 Raw material of coated paper (base paper)
・ Chemical pulp: Nippon Paper Industries LBKP (hardwood bleached kraft pulp)
・ Light calcium carbonate: Nippon Paper's internal filler
(顔料)
・重質炭酸カルシウム:ファイマテック社製FMT97(レーザー回折法によって測定した平均粒子径d50=0.64μm、レーザー回折法による粒子径が2μm以下の粒子の割合:97%)
・軽質炭酸カルシウム:日本製紙製塗工用顔料(レーザー回折法によって測定した平均粒子径d50=0.92μm、レーザー回折法による粒子径が2μm以下の粒子の割合:89%)
・カオリン:イメリス社製KCS(レーザー回折法によって測定した平均粒子径d50=4.05μm)
・澱粉粒子:日本コーンスターチ社製Y-3P(未変性トウモロコシ澱粉、レーザー回折法によって測定した平均粒子径d50:約15μm)
図1に、Malvern社製Mastersizer S(レーザー回析式粒度分布測定機)を用いて測定した澱粉粒子の粒度分布を示す。 (Pigment)
・ Heavy calcium carbonate: FMT97 manufactured by Pfematec Co., Ltd. (average particle diameter d50 = 0.64 μm measured by laser diffraction method, ratio of particles having a particle diameter of 2 μm or less by laser diffraction method: 97%)
・ Light calcium carbonate: Nippon Paper Co., Ltd. pigment for coating (average particle diameter measured by laser diffraction method d50 = 0.92 μm, ratio of particles having a particle diameter of 2 μm or less by laser diffraction method: 89%)
-Kaolin: KCS manufactured by Imeris (average particle diameter measured by laser diffraction method d50 = 4.05 μm)
Starch particles: Y-3P manufactured by Nippon Corn Starch (unmodified corn starch, average particle diameter d50 measured by laser diffraction method: about 15 μm)
FIG. 1 shows the particle size distribution of starch particles measured using Mastersizer S (laser diffraction particle size distribution measuring machine) manufactured by Malvern.
・重質炭酸カルシウム:ファイマテック社製FMT97(レーザー回折法によって測定した平均粒子径d50=0.64μm、レーザー回折法による粒子径が2μm以下の粒子の割合:97%)
・軽質炭酸カルシウム:日本製紙製塗工用顔料(レーザー回折法によって測定した平均粒子径d50=0.92μm、レーザー回折法による粒子径が2μm以下の粒子の割合:89%)
・カオリン:イメリス社製KCS(レーザー回折法によって測定した平均粒子径d50=4.05μm)
・澱粉粒子:日本コーンスターチ社製Y-3P(未変性トウモロコシ澱粉、レーザー回折法によって測定した平均粒子径d50:約15μm)
図1に、Malvern社製Mastersizer S(レーザー回析式粒度分布測定機)を用いて測定した澱粉粒子の粒度分布を示す。 (Pigment)
・ Heavy calcium carbonate: FMT97 manufactured by Pfematec Co., Ltd. (average particle diameter d50 = 0.64 μm measured by laser diffraction method, ratio of particles having a particle diameter of 2 μm or less by laser diffraction method: 97%)
・ Light calcium carbonate: Nippon Paper Co., Ltd. pigment for coating (average particle diameter measured by laser diffraction method d50 = 0.92 μm, ratio of particles having a particle diameter of 2 μm or less by laser diffraction method: 89%)
-Kaolin: KCS manufactured by Imeris (average particle diameter measured by laser diffraction method d50 = 4.05 μm)
Starch particles: Y-3P manufactured by Nippon Corn Starch (unmodified corn starch, average particle diameter d50 measured by laser diffraction method: about 15 μm)
FIG. 1 shows the particle size distribution of starch particles measured using Mastersizer S (laser diffraction particle size distribution measuring machine) manufactured by Malvern.
(バインダー)
・スチレン・ブタジエン系共重合ラテックス:A&L社製PB1537(平均粒子径110nm、ガラス転移温度10℃)
・スチレン・ブタジエン系共重合ラテックス:A&L社製PB9501(平均粒子径80nm、ガラス転移温度-12℃)
・酸化澱粉:日本コーンスターチ社製SK200(トウモロコシ澱粉) (binder)
Styrene / butadiene copolymer latex: A & L PB1537 (average particle size 110 nm,glass transition temperature 10 ° C.)
Styrene / butadiene copolymer latex: PB9501 manufactured by A & L (average particle size 80 nm, glass transition temperature -12 ° C.)
・ Oxidized starch: Nippon Cornstarch SK200 (corn starch)
・スチレン・ブタジエン系共重合ラテックス:A&L社製PB1537(平均粒子径110nm、ガラス転移温度10℃)
・スチレン・ブタジエン系共重合ラテックス:A&L社製PB9501(平均粒子径80nm、ガラス転移温度-12℃)
・酸化澱粉:日本コーンスターチ社製SK200(トウモロコシ澱粉) (binder)
Styrene / butadiene copolymer latex: A & L PB1537 (average particle size 110 nm,
Styrene / butadiene copolymer latex: PB9501 manufactured by A & L (average particle size 80 nm, glass transition temperature -12 ° C.)
・ Oxidized starch: Nippon Cornstarch SK200 (corn starch)
実験1:塗工紙の製造(2層塗工)
坪量が75g/m2である原紙上に、片面あたりの乾燥塗工量が6.5g/m2である顔料塗工層(アンダー層)、片面あたりの乾燥塗工量が10.5g/m2である顔料塗工層(トップ層:最外塗工層)を設けた印刷用塗工紙を製造した(サンプル1-1~1-7、坪量:約109g/m2)。 Experiment 1: Production of coated paper (two-layer coating)
On base paper having a basis weight of 75 g / m 2, the pigment coating layer dry coating amount per side is 6.5 g / m 2 (under layer), dry coating amount per one side 10.5 g / A coated paper for printing provided with a pigment coating layer (top layer: outermost coating layer) of m 2 was produced (samples 1-1 to 1-7, basis weight: about 109 g / m 2 ).
坪量が75g/m2である原紙上に、片面あたりの乾燥塗工量が6.5g/m2である顔料塗工層(アンダー層)、片面あたりの乾燥塗工量が10.5g/m2である顔料塗工層(トップ層:最外塗工層)を設けた印刷用塗工紙を製造した(サンプル1-1~1-7、坪量:約109g/m2)。 Experiment 1: Production of coated paper (two-layer coating)
On base paper having a basis weight of 75 g / m 2, the pigment coating layer dry coating amount per side is 6.5 g / m 2 (under layer), dry coating amount per one side 10.5 g / A coated paper for printing provided with a pigment coating layer (top layer: outermost coating layer) of m 2 was produced (samples 1-1 to 1-7, basis weight: about 109 g / m 2 ).
(原紙)
坪量が98g/m2、密度が0.73g/cm3の上質紙を原紙として使用した。パルプ配合は化学パルプ100%(LBKP100重量%)であり、填料として軽質炭酸カルシウムを13重量%含有した (Base paper)
A high quality paper having a basis weight of 98 g / m 2 and a density of 0.73 g / cm 3 was used as a base paper. The pulp blend was 100% chemical pulp (LBKP 100% by weight) and contained 13% by weight light calcium carbonate as a filler.
坪量が98g/m2、密度が0.73g/cm3の上質紙を原紙として使用した。パルプ配合は化学パルプ100%(LBKP100重量%)であり、填料として軽質炭酸カルシウムを13重量%含有した (Base paper)
A high quality paper having a basis weight of 98 g / m 2 and a density of 0.73 g / cm 3 was used as a base paper. The pulp blend was 100% chemical pulp (LBKP 100% by weight) and contained 13% by weight light calcium carbonate as a filler.
(アンダー塗工)
顔料として重質炭酸カルシウムを用い、顔料100重量部(固形分)に対して、接着剤としてスチレン・ブタジエン系共重合ラテックス(A&L社製PB1537)7重量部および蒸煮した酸化澱粉(日本コーンスターチ社製SK200)3重量部を配合し、さらに水を加えて固形分濃度66重量%のアンダー塗工液を得た。 (Under coating)
Heavy calcium carbonate is used as the pigment, and 7 parts by weight of styrene / butadiene copolymer latex (A & L PB1537) and steamed oxidized starch (manufactured by Nippon Corn Starch Co., Ltd.) with respect to 100 parts by weight (solid content) of the pigment. SK200) 3 parts by weight was added, and water was further added to obtain an under coating liquid having a solid concentration of 66% by weight.
顔料として重質炭酸カルシウムを用い、顔料100重量部(固形分)に対して、接着剤としてスチレン・ブタジエン系共重合ラテックス(A&L社製PB1537)7重量部および蒸煮した酸化澱粉(日本コーンスターチ社製SK200)3重量部を配合し、さらに水を加えて固形分濃度66重量%のアンダー塗工液を得た。 (Under coating)
Heavy calcium carbonate is used as the pigment, and 7 parts by weight of styrene / butadiene copolymer latex (A & L PB1537) and steamed oxidized starch (manufactured by Nippon Corn Starch Co., Ltd.) with respect to 100 parts by weight (solid content) of the pigment. SK200) 3 parts by weight was added, and water was further added to obtain an under coating liquid having a solid concentration of 66% by weight.
前記原紙上に、アンダー顔料塗工液をブレードコーターで片面あたりの乾燥塗工量が6.5g/m2となるように塗工速度650m/minで両面塗工し、その後乾燥してアンダー塗工層を原紙上に設けた。
On the base paper, an under pigment coating solution is coated on both sides with a blade coater at a coating speed of 650 m / min so that the dry coating amount per side is 6.5 g / m 2, and then dried and undercoated. A construction layer was provided on the base paper.
(トップ塗工)
塗工顔料として、下表に示す量で重質炭酸カルシウムスラリーおよび澱粉粒子(日本コーンスターチ社製Y-3P、未蒸煮)を用い、顔料100重量部(固形分)に対して、接着剤としてスチレン・ブタジエン系共重合ラテックス(A&L社製PB9501)4重量部および蒸煮した酸化澱粉(日本コーンスターチ社製SK200)6重量部配合し、さらに水を加えて固形分濃度66重量%のトップ塗工用の顔料塗工液を得た。 (Top coating)
As coating pigment, heavy calcium carbonate slurry and starch particles (Y-3P manufactured by Nippon Corn Starch Co., Ltd., uncooked) were used in the amounts shown in the table below, and styrene was used as an adhesive for 100 parts by weight (solid content) of pigment. -Blending 4 parts by weight of butadiene copolymer latex (PB9501 manufactured by A & L) and 6 parts by weight of steamed oxidized starch (SK200 manufactured by Nippon Corn Starch Co., Ltd.) and adding water to top coating with a solid content concentration of 66% by weight A pigment coating solution was obtained.
塗工顔料として、下表に示す量で重質炭酸カルシウムスラリーおよび澱粉粒子(日本コーンスターチ社製Y-3P、未蒸煮)を用い、顔料100重量部(固形分)に対して、接着剤としてスチレン・ブタジエン系共重合ラテックス(A&L社製PB9501)4重量部および蒸煮した酸化澱粉(日本コーンスターチ社製SK200)6重量部配合し、さらに水を加えて固形分濃度66重量%のトップ塗工用の顔料塗工液を得た。 (Top coating)
As coating pigment, heavy calcium carbonate slurry and starch particles (Y-3P manufactured by Nippon Corn Starch Co., Ltd., uncooked) were used in the amounts shown in the table below, and styrene was used as an adhesive for 100 parts by weight (solid content) of pigment. -Blending 4 parts by weight of butadiene copolymer latex (PB9501 manufactured by A & L) and 6 parts by weight of steamed oxidized starch (SK200 manufactured by Nippon Corn Starch Co., Ltd.) and adding water to top coating with a solid content concentration of 66% by weight A pigment coating solution was obtained.
アンダー塗工した原紙上に、トップ塗工用顔料塗工液をブレードコーターで片面あたりの乾燥塗工量が10.5g/m2となるように両面塗工し、その後乾燥して印刷用塗工紙を得た(サンプル1-1~1-6)。
On top of the undercoated base paper, the top coating pigment coating solution is coated on both sides with a blade coater so that the dry coating amount per side is 10.5 g / m 2, and then dried for printing. Wrought paper was obtained (Samples 1-1 to 1-6).
また、アンダー層に澱粉粒子を配合した塗工紙として、サンプル1-7を製造した。具体的には、アンダー塗工に用いる塗工を、重質炭酸カルシウム90重量部および澱粉粒子(日本コーンスターチ社製Y-3P、未蒸煮)10重量部とした以外は、サンプル1-6と同様にして印刷用塗工紙を製造した。
Also, Sample 1-7 was produced as a coated paper in which starch particles were blended in the under layer. Specifically, the coating used for the under coating was the same as Sample 1-6, except that 90 parts by weight of heavy calcium carbonate and 10 parts by weight of starch particles (Y-3P manufactured by Nippon Cornstarch, uncooked) were used. Thus, a coated paper for printing was produced.
さらに、アンダー層およびトップ層に用いる重質炭酸カルシウムを軽質炭酸カルシウムに代え、下表に示す配合で澱粉粒子(日本コーンスターチ社製Y-3P、未蒸煮)をアンダー層に用いた以外は、サンプル1-1と同様にして印刷用塗工紙を製造した(サンプル1-8~1-9)。
Furthermore, the sample was used except that the heavy calcium carbonate used for the under layer and the top layer was replaced with light calcium carbonate, and starch particles (Y-3P, uncooked by Nippon Corn Starch Co., Ltd.) were used for the under layer with the composition shown in the table below. In the same manner as in 1-1, coated paper for printing was produced (Samples 1-8 to 1-9).
実験2:塗工紙の製造(1層塗工)
坪量が75g/m2である原紙上に、片面あたりの乾燥塗工量が15g/m2である顔料塗工層を両面塗工し、印刷用塗工紙を製造した(サンプル2-1~2-2、坪量:約105g/m2)。 Experiment 2: Production of coated paper (single-layer coating)
On base paper having a basis weight of 75 g / m 2, the pigment coating layer dry coating weight per one side is 15 g / m 2 to both surfaces coated to produce a coated printing paper (sample 2-1 2-2, basis weight: about 105 g / m 2 ).
坪量が75g/m2である原紙上に、片面あたりの乾燥塗工量が15g/m2である顔料塗工層を両面塗工し、印刷用塗工紙を製造した(サンプル2-1~2-2、坪量:約105g/m2)。 Experiment 2: Production of coated paper (single-layer coating)
On base paper having a basis weight of 75 g / m 2, the pigment coating layer dry coating weight per one side is 15 g / m 2 to both surfaces coated to produce a coated printing paper (sample 2-1 2-2, basis weight: about 105 g / m 2 ).
顔料として、重質炭酸カルシウムスラリー53.5重量部(固形分)、カオリン45重量部(固形分)、未蒸煮の澱粉粒子1.5重量部を用い、顔料100重量部に対して、接着剤としてスチレン・ブタジエン系共重合ラテックス(A&L社製PB9501)4重量部および蒸煮した酸化澱粉(日本コーンスターチ社製SK200)6重量部を配合し、さらに水を加えて固形分濃度66重量%の顔料塗工液を得た。
As the pigment, 53.5 parts by weight of heavy calcium carbonate slurry (solid content), 45 parts by weight of kaolin (solid content), 1.5 parts by weight of uncooked starch particles, and 100 parts by weight of the pigment, the adhesive As a blend, 4 parts by weight of styrene / butadiene copolymer latex (PB9501 manufactured by A & L) and 6 parts by weight of steamed oxidized starch (SK200 manufactured by Nippon Corn Starch Co., Ltd.) were added, and water was added to give a pigment with a solid content concentration of 66% by weight. A working solution was obtained.
実験1の原紙上に、この顔料塗工液をブレードコーターで片面あたりの乾燥塗工量が15.0g/m2となるように両面塗工し、その後乾燥して印刷用塗工紙を得た(サンプル2-1)。
On the base paper of Experiment 1, this pigment coating solution was coated on both sides with a blade coater so that the dry coating amount per side was 15.0 g / m 2, and then dried to obtain a coated paper for printing. (Sample 2-1).
また、未蒸煮の澱粉粒子を配合せず、重質炭酸カルシウムを55重量部とした以外は、サンプル2-1と同様にして印刷用塗工紙を得た(サンプル2-2:比較例)。
Also, a coated paper for printing was obtained in the same manner as in Sample 2-1, except that uncooked starch particles were not blended and the amount of heavy calcium carbonate was changed to 55 parts by weight (Sample 2-2: Comparative Example). .
さらに、重質炭酸カルシウムを軽質炭酸カルシウムに代えた以外は、サンプル2-1およびサンプル2-2と同様にして印刷用塗工紙を製造した(サンプル2-3~2-4)。
Further, a coated paper for printing was produced in the same manner as Sample 2-1 and Sample 2-2 except that heavy calcium carbonate was replaced with light calcium carbonate (Samples 2-3 to 2-4).
表から明らかなように、顔料塗工層に未蒸煮の澱粉粒を含有させることによって、低密度な印刷用塗工紙を得ることができた。無機顔料と比較して澱粉粒子は比重が小さいため、澱粉粒子の配合により顔料塗工層が低密度化するとともに、最外塗工層に澱粉粒子を配合した場合は澱粉粒子によって紙厚が大きくなるために塗工紙全体として低密度化したものと考えられる。
As is clear from the table, low-density coated coated paper could be obtained by adding uncooked starch granules to the pigment coated layer. Since the specific gravity of starch particles is smaller than that of inorganic pigments, the density of the pigment coating layer is reduced by blending the starch particles, and when the starch particles are blended in the outermost coating layer, the paper thickness is increased by the starch particles. Therefore, it is thought that the density of the coated paper is reduced as a whole.
また、本発明の印刷用塗工紙は、印刷後のインキ擦れが少なく、塗工適性も優れたものであった。塗工紙の表面近くに存在する澱粉粒子により塗工紙表面の凹凸が大きくなり、重ねあわせた塗工紙同士の接触面積が小さくなるとともに、澱粉粒子のクッション性によってインキ擦れが低減したものと考えられる。
The coated paper for printing of the present invention had little ink rubbing after printing and was excellent in coating suitability. The unevenness of the coated paper surface increases due to the starch particles present near the surface of the coated paper, the contact area between the superimposed coated papers decreases, and the ink rub is reduced due to the cushioning properties of the starch particles. Conceivable.
図2~4にサンプル1-5に係る塗工紙を分析した結果を示す。サンプル1-5に係る塗工紙の表面を分析した際の表面写真を図2に示すが、直径が2~50μmである澱粉粒は、1.5mm×2.1mmあたり11個(1mm2あたりに換算すると約3.5個)だった。また、図4に示す断面写真から明らかなように、顔料塗工層に澱粉粒子を存在させることによって、本発明に係る塗工紙は、澱粉粒子が過度に露出することがなく、印刷時などに澱粉粒子が脱落しにくい顔料塗工層となっていた。
2 to 4 show the results of analyzing the coated paper according to Sample 1-5. FIG. 2 shows a surface photograph when the surface of the coated paper according to Sample 1-5 is analyzed, and 11 starch granules having a diameter of 2 to 50 μm per 1.5 mm × 2.1 mm (per 1 mm 2 It was about 3.5). Further, as apparent from the cross-sectional photograph shown in FIG. 4, the coated paper according to the present invention does not expose the starch particles excessively by printing the starch particles in the pigment coating layer. In addition, it was a pigment coating layer in which starch particles hardly fall off.
Claims (6)
- 澱粉粒と白色顔料を含む顔料塗工層と原紙を有する印刷用塗工紙。 A coated paper for printing having a pigment coated layer containing starch granules and a white pigment and a base paper.
- 前記澱粉粒の平均粒子径が8~25μmである、請求項1に記載の塗工紙。 The coated paper according to claim 1, wherein the starch granules have an average particle size of 8 to 25 µm.
- 前記顔料塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、請求項1または2に記載の塗工紙。 The coated paper according to claim 1 or 2, wherein the weight ratio of the starch granules to the total of the starch granules and the white pigment constituting the pigment coating layer is 0.5 to 10%.
- 前記塗工紙が複数の顔料塗工層を有しており、前記澱粉粒が少なくとも最外塗工層に存在する、請求項1~3のいずれかに記載の塗工紙。 The coated paper according to any one of claims 1 to 3, wherein the coated paper has a plurality of pigment coated layers, and the starch granules are present at least in the outermost coated layer.
- 前記最外塗工層を構成する澱粉粒と白色顔料の合計に対する澱粉粒の重量割合が、0.5~10%である、請求項4に記載の塗工紙。 The coated paper according to claim 4, wherein the weight ratio of the starch granules to the total of the starch granules and the white pigment constituting the outermost coating layer is 0.5 to 10%.
- JAPAN TAPPI紙パルプ試験方法No47に基づいて、ヨウ素溶液(定量法)を用いて塗工紙の白紙サンプルを気化染色した場合、直径が2~50μmの大きさの染色された澱粉粒子の数が、1~300個/1mm2である、請求項1~5のいずれかに記載の塗工紙。
Based on the JAPAN TAPPI paper pulp test method No. 47, when a blank sample of coated paper is vapor-dyed using an iodine solution (quantitative method), the number of stained starch particles having a diameter of 2 to 50 μm is 1 is a 300/1 mm 2, coated paper according to any one of claims 1 to 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019504436A JPWO2018163795A1 (en) | 2017-03-06 | 2018-02-20 | Coated paper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017-041800 | 2017-03-06 | ||
JP2017041800 | 2017-03-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018163795A1 true WO2018163795A1 (en) | 2018-09-13 |
Family
ID=63449079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/005848 WO2018163795A1 (en) | 2017-03-06 | 2018-02-20 | Coated paper |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2018163795A1 (en) |
TW (1) | TW201842262A (en) |
WO (1) | WO2018163795A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110565437A (en) * | 2019-07-22 | 2019-12-13 | 深圳市万极科技股份有限公司 | Surface coating and preparation method thereof, water transfer printing paper and preparation method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH059894A (en) * | 1991-07-08 | 1993-01-19 | Honshu Paper Co Ltd | High-smoothness mat-tone coated paper |
JPH0559692A (en) * | 1991-08-09 | 1993-03-09 | Honshu Paper Co Ltd | Multi-layer coated paper |
JPH07505927A (en) * | 1992-04-25 | 1995-06-29 | シユトーラ フエルトミユーレ アクチエンゲゼルシヤフト | printing support |
JPH08127996A (en) * | 1994-10-28 | 1996-05-21 | New Oji Paper Co Ltd | Mat coated paper for printing |
WO2015041276A1 (en) * | 2013-09-19 | 2015-03-26 | 日本製紙株式会社 | White paperboard, and production method therefor |
-
2018
- 2018-02-20 JP JP2019504436A patent/JPWO2018163795A1/en active Pending
- 2018-02-20 WO PCT/JP2018/005848 patent/WO2018163795A1/en active Application Filing
- 2018-03-02 TW TW107106910A patent/TW201842262A/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH059894A (en) * | 1991-07-08 | 1993-01-19 | Honshu Paper Co Ltd | High-smoothness mat-tone coated paper |
JPH0559692A (en) * | 1991-08-09 | 1993-03-09 | Honshu Paper Co Ltd | Multi-layer coated paper |
JPH07505927A (en) * | 1992-04-25 | 1995-06-29 | シユトーラ フエルトミユーレ アクチエンゲゼルシヤフト | printing support |
JPH08127996A (en) * | 1994-10-28 | 1996-05-21 | New Oji Paper Co Ltd | Mat coated paper for printing |
WO2015041276A1 (en) * | 2013-09-19 | 2015-03-26 | 日本製紙株式会社 | White paperboard, and production method therefor |
Also Published As
Publication number | Publication date |
---|---|
TW201842262A (en) | 2018-12-01 |
JPWO2018163795A1 (en) | 2019-12-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5743721B2 (en) | Printing paper | |
JP5798182B2 (en) | Coated paper and method for producing the same | |
WO2018163795A1 (en) | Coated paper | |
JP6389367B2 (en) | Coated paper and method for producing the same | |
JP5917220B2 (en) | Coated paper for printing and method for producing the same | |
JP2014208936A (en) | Coated paper | |
JP2018162551A (en) | Coated paper and production method thereof | |
WO2010150775A1 (en) | Printing paper | |
JP5955602B2 (en) | Newspaper and its manufacturing method | |
JP6633251B2 (en) | Coated paper for printing | |
JP7440994B2 (en) | coated paper | |
JP2018178277A (en) | Clear coated paper | |
JP7121498B2 (en) | printing paper | |
JP5889080B2 (en) | Electrophotographic transfer paper and method for producing the same | |
JP5033038B2 (en) | Manufacturing method of coated paper | |
JP2024026131A (en) | coated paper for printing | |
WO2020171198A1 (en) | Coated printing paper | |
WO2023210709A1 (en) | Coated paper | |
JP4668328B2 (en) | Coated paper for gravure printing | |
JP2024020406A (en) | coated paper | |
WO2018230683A1 (en) | Coated paper for use in printing |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18764161 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2019504436 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 18764161 Country of ref document: EP Kind code of ref document: A1 |