WO2019244970A1 - Coated printing paper - Google Patents
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- WO2019244970A1 WO2019244970A1 PCT/JP2019/024451 JP2019024451W WO2019244970A1 WO 2019244970 A1 WO2019244970 A1 WO 2019244970A1 JP 2019024451 W JP2019024451 W JP 2019024451W WO 2019244970 A1 WO2019244970 A1 WO 2019244970A1
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- paper
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- printing
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
Definitions
- the present invention relates to a coated paper for printing having high glossiness and high strength.
- Coated paper is roughly classified into glossy coated paper and matte coated paper.
- high glossy coated papers include art paper, superart paper, and coated paper used for catalogs and pamphlets, which have been used for high-grade printing.
- the degree of gloss and print gloss are both high.
- the matte coated paper is a coated paper having a lower white paper glossiness and a lower printed glossiness than a high glossy coated paper, and includes dull coated paper and matte coated paper.
- high gloss coated paper achieves white paper gloss by using a large amount of flat pigment kaolin or clay or by using a plastic pigment having good gloss development.
- the main surface of a flat pigment such as kaolin or clay is acidic and the side surface is basic (Non-Patent Document 1), and an adhesive such as latex generally used for coated paper contains an acidic group. Therefore, since the main surface of kaolin or clay is acidic, affinity with an adhesive such as latex is low.
- the side surface of kaolin or clay is basic, it has a high affinity with the adhesive, but has a problem that the efficiency of developing strength is low due to the fact that the area is small and a sufficient bonding area cannot be achieved.
- Kaolin or clay is a pigment having a yellow-brown color.
- Coated paper that uses a large amount of the pigment has a strong yellow tint, and the hue of high gloss coated paper tends to be yellowish.
- the yellow tint is represented by b * in the L * a * b * colorimetric system, but paper with a strong yellow tint tends to have a high b * value.
- the yellow tint of the entire printed matter becomes strong, so that the color development of the printed matter tends to be inferior.
- Plastic pigment is a very expensive material, and it has been difficult to use it for general glossy coated paper such as flyers. Further, the use of plastic pigments, which are organic pigments, has been increasingly avoided in consideration of the environment.
- a base paper is provided with a pigment coating layer on at least one side thereof, An outermost pigment coating layer containing calcium carbonate having an average particle diameter (D50) of greater than 0.50 ⁇ m and 0.80 ⁇ m or less; A coated paper for printing having a blank glossiness (75 °) of 60% or more.
- D50 average particle diameter
- a coated paper for printing having a blank glossiness (75 °) of 60% or more.
- X to Y includes the values of X and Y.
- X or Y means one or both of X and Y.
- Printing Coated Paper is printing paper provided with a pigment coating layer provided on base paper.
- the pigment coating layer is a layer containing a white pigment as a main component.
- the printing coated paper of the present invention contains calcium carbonate having an outermost pigment coating layer having an average particle diameter (D50) of more than 0.50 ⁇ m and 0.80 ⁇ m or less.
- the coated printing paper of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser method, ink jet method, and electrophotographic method) on the surface of the paper. Examples include, but are not limited to, magazines, posters, envelopes, calendars, and the like.
- Pigment Coating Layer 1 Pigment The pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 ⁇ m and 0.80 ⁇ m or less (hereinafter, also referred to as “first calcium carbonate”). D50 is a 50% volume average particle diameter.
- the particle size distribution and D50 of the pigment by the sedimentation method can be measured by a master sizer 3000 manufactured by Malvern.
- the upper limit of the D50 of calcium carbonate is preferably 0.75 ⁇ m or less, and more preferably 0.70 ⁇ m or less. From the viewpoint of the specific surface area of the pigment and the required amount of the binder, the lower limit is preferably 0.55 ⁇ m or more.
- the coating layer becomes dense, resulting in high gloss, and further, since the required amount of the binder is smaller than when a pigment having a particle size of less than 0.50 ⁇ m is used, coated printing paper having excellent strength. Can be obtained.
- the outermost pigment coating layer on at least one side may contain the first calcium carbonate.
- the lower limit of the amount of the first calcium carbonate in the outermost pigment coating layer is preferably at least 40 parts by weight, and more preferably at least 75 parts by weight, per 100 parts by weight of the pigment in the pigment coating layer. More preferably, it is more preferably at least 80 parts by weight.
- the whole may be the first calcium carbonate.
- the first calcium carbonate is preferably heavy calcium carbonate or light calcium carbonate produced in the causticizing step of the pulp production step (causticized light calcium carbonate, see Japanese Patent No. 5274077).
- a pigment generally used in the art can be used.
- examples include kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, satin
- examples include inorganic pigments such as white and organic pigments such as solid type, hollow type, and core-shell type. These pigments may be used in combination of two or more kinds.
- the white pigment other than the first calcium carbonate it is preferable to use heavy calcium carbonate or light calcium carbonate having a D50 of more than 0.80 ⁇ m (hereinafter, also referred to as “second calcium carbonate”).
- Calcium carbonate is excellent in binding to an adhesive (binder) and improves whiteness, so that high strength, whiteness and printability can be achieved.
- the total amount of the first and second calcium carbonates is preferably 90 parts by weight or more, and more preferably 100 parts by weight.
- the total amount of the first and second calcium carbonates in the pigment coating layers other than the outermost coating layer is not limited, but is preferably in the above range.
- the second calcium carbonate is heavy calcium carbonate or causticized light calcium carbonate.
- the pigment coating layer contains an adhesive (binder) as a matrix.
- the adhesive is not limited, and a known adhesive can be used. Examples thereof include styrene / butadiene copolymers, styrene / acrylic copolymers, ethylene / vinyl acetate copolymers, butadiene / methyl methacrylate copolymers, vinyl acetate / butyl acrylate copolymers, and anhydrides.
- Latexes such as maleic acid copolymer and acrylic acid / methyl methacrylate copolymer; polyvinyl alcohols such as completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, and acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as protein and synthetic protein; oxidized starch, positive starch, etherified starch such as urea-phosphate esterified starch, hydroxyethyl etherified starch, and starches such as dextrin; carboxymethylcellulose, hydroxyethylcellulose, hydrate Cellulose derivatives such as carboxymethyl cellulose and the like. These plural types can be used in combination.
- the amount of the adhesive is preferably 5 to 30 parts by weight, and more preferably 8 to 25 parts by weight based on 100 parts by weight of the pigment in the entire pigment coating layer from the viewpoint of printability and coating suitability. More preferred.
- the upper limit is more preferably 20 parts by weight or less, and most preferably 17 parts by weight or less.
- the coated printing paper of the present invention preferably contains 10 to 80% by weight of latex in the total adhesive, more preferably 15 to 70% by weight of latex.
- Latex is an adhesive in the form of an emulsion.
- a styrene / butadiene latex is preferable.
- calcium carbonate has better affinity with an adhesive having an acidic group such as latex as compared with kaolin or clay. For this reason, by using latex for the printing coated paper of the present invention, a printing coated paper excellent in strength development can be obtained.
- the coated printing paper of the present invention is provided with a pigment coated layer, but when having two or more pigment coated layers, the layer closest to the base paper may contain 10 to 80% by weight of latex in the total adhesive.
- the layer remote from the base paper preferably contains 30 to 60% by weight of latex. It is particularly preferred to use starches as the other adhesive, and the amount is preferably 30 to 90% by weight of the total adhesive in the layer closest to the base paper, and 40 to 70% by weight in the layer far from the base paper. Preferably, there is.
- the pigment coating layer may be used as a dispersant, a thickener, a water retention agent, a defoaming agent, a water-proofing agent, a dye, a pigment for coloring, or the like for a general pigment for coated paper. It may contain various auxiliary agents to be blended.
- the coating amount of 4) coated amount pigment coating layer is preferably from 7 g / m 2 or more in terms of solid per side content, more preferably 10 g / m 2 or more, further preferably 15 g / m 2 or more. If the coating amount is less than 7 g / m 2 , the unevenness on the surface of the paper base material cannot be sufficiently covered, so that the receptivity of the printing ink may be remarkably reduced. There is. On the other hand, the coating amount of the pigment coating layer is preferably 50 g / m 2 or less, more preferably 40g / m 2, 35g / m 2 or less is more preferred. The coating amount is a total value of all the pigment coating layers per one side.
- the innermost pigment coating layer (the pigment coating layer adjacent to the base paper) is used.
- the coating amount is preferably 2 to 15 g / m 2 , more preferably 5 to 12 g / m 2 .
- the coating amount of the outermost pigment coating layer is preferably 7 g / m 2 or more, more preferably 8 g / m 2 or more. Its upper limit is preferably 20 g / m 2 or less, more preferably 15 g / m 2 or less. Since the outermost coating layer has a large influence on the glossiness, the coating amount of the outermost coating layer is preferably larger than the coating amount of the innermost pigment coating layer.
- Base paper 1 Pulp Known pulp can be used for base paper.
- Known pulp includes chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemical ground pulp (CGP), and semi-chemical pulp (SCP).
- waste paper pulp In the present invention, it is preferable to use chemical pulp.
- Chemical pulp includes those manufactured by the kraft pulp method and those manufactured by the sulfite pulp method.In the present invention, both of them can be used, but the chemical pulp manufactured by the kraft method has a low production cost. It is suitable from the viewpoint.
- the content of the chemical pulp in the raw material pulp is preferably 60% by weight or more, more preferably 80% by weight or more, further preferably 90% by weight or more, and particularly preferably 95% by weight or more, from the viewpoint of whiteness and the like. preferable.
- filler A known filler may be used for the base paper.
- Known fillers include heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, delamikaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water
- Inorganic fillers such as amorphous silica produced by neutralization of aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, sodium silicate with a mineral acid, urea-formalin resin, melamine
- Organic fillers such as a base resin, a polystyrene resin, and a phenol resin are exemplified.
- heavy calcium carbonate and light calcium carbonate which are typical fillers in neutral papermaking and alkali papermaking, are preferably used for improving opacity.
- the calcium carbonate used as the filler may be the first calcium carbonate or the second calcium carbonate, but light calcium carbonate is preferred.
- the filler ratio in paper is not particularly limited, it is preferably 1 to 40% by weight, more preferably 10 to 35% by weight. In consideration of the strength of the base paper, it is more preferably 10 to 20% by weight.
- a papermaking internal additive such as a sulfuric acid band or various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers or internal sizing agents may be used as required.
- a papermaking internal additive such as a sulfuric acid band or various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers or internal sizing agents may be used as required.
- the dry paper strength improver include polyacrylamide and cationized starch
- examples of the wet paper strength improver include polyamidoamine epichlorohydrin. These chemicals are added within a range that does not affect formation or operability.
- the internal sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent.
- the basis weight of base paper coated printing paper having a basis weight of the present invention of the base paper is preferably 40 ⁇ 160g / m 2, more preferably 45 ⁇ 150g / m 2, more preferably 50 ⁇ 140g / m 2.
- the coated paper for printing of the present invention may have a clear (transparent) coated layer on one or both sides of the above-described base paper.
- the amount of the clear coating is preferably 0.1 to 3.0 g / m 2 , more preferably 0.2 to 2.0 g / m 2 , and still more preferably 0.5 to 2.0 g / m 2 in terms of solids per side. m 2 .
- the clear coating means for example, using a coater (coating machine) such as a two-roll pound size press, a gate roll coater, a pre-metalling size press, a curtain coater, and a spray coater, to obtain starch, oxidized starch,
- the clear coating solution can be coated with a sizing agent. In the present invention, it is preferable to apply starch.
- the coated paper for printing of the present invention can be produced by a known method, but is preferably produced by applying a pigment coating solution containing a pigment and an adhesive on base paper.
- the base paper is manufactured by a known paper making method. For example, using a fourdrinier paper machine including a top wire, an on-top former, a gap former, a round net paper machine, a paperboard paper machine combining a fourdrinier paper machine and a round net paper machine, a Yankee dryer machine, or the like. Can be.
- the pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline.
- the papermaking speed is not particularly limited.
- the base paper used in the present invention may be a single layer or a multilayer, but a single layer base paper is preferably used.
- the pigment coating liquid can be prepared by dispersing or dissolving a pigment, an adhesive, and, as needed, an additive in water.
- the composition of each component is adjusted so that the above-mentioned pigment coating layer can be formed.
- the solid content concentration of the pigment coating liquid is preferably 40 to 70% by weight, more preferably 60 to 70% by weight.
- the viscosity of the pigment coating solution is preferably such that the B-type viscosity measured at room temperature at 60 rpm is in the range of 500 to 5000 mPa ⁇ s.
- the solid content of the pigment coating liquid is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content weight is too low, backflow or the like occurs in blade coating, while if it is too high, operability is affected, such as increasing the blade load and abrasion of the blade, and generating rolls in a roll coater.
- the coating method is not limited, and a known coating method such as a roll coater or a blade coater can be used.
- the coating speed is not particularly limited, but is preferably 400 to 1800 m / min for a blade coater and 400 to 2000 m / min for a roll coater.
- the pigment coating layer may be coated with a one-layer blade coater, may be coated with a roll coater and then coated with a blade coater, or may be coated with a blade coater and then coated with a blade coater.
- coating may be performed, it is preferable to use a blade coater for coating the outermost coating layer because the surface smoothness can be improved.
- the coated printing paper of the present invention has a pigment coated layer on at least one side, and may have two or more pigment coated layers.
- the number of the pigment coating layers is two or more, the fiber covering property is improved and the smoothness is also increased.
- the number of layers is three or more, the quality of coated paper is improved because the amount of coating can be increased, but the number of layers is preferably one or two from the viewpoint of cost and operability.
- a clear coating layer may be provided on the base paper, and a pigment coating layer may be provided thereon.
- the method for drying the wet coating layer is not limited, and for example, a steam heating cylinder, a heated hot air dryer, a gas heater dryer, an electric heater dryer, an infrared heater dryer, or the like can be used.
- the coated paper for printing of the present invention may be subjected to a surface treatment on the coated paper produced as described above, and is preferably subjected to a calender treatment in order to obtain a high glossiness.
- a commonly used calendar device such as a super calendar or a soft calendar can be used as appropriate.
- the calendering conditions the temperature of the rigid roll, the calender pressure, the number of nips, the roll speed, the paper moisture before calendering, etc., are appropriately selected according to the required quality, but in the coated paper for printing of the present invention. More preferably, hot soft nip calendering is performed.
- the processing conditions are preferably a linear pressure of 140 to 300 kN / m, a temperature of 70 to 300 ° C. and 5 nips or more.
- the processing speed is about 200 to 800 m / min.
- Blank glossiness is an index indicating the glossiness of blank paper. In the present invention, the glossiness is measured in accordance with JIS-P8142. is there.
- the coated printing paper of the present invention is a high-gloss printing coated paper having a high degree of white paper gloss.
- the white paper glossiness of the coated paper for printing of the present invention is 60% or more, preferably 65% or more, more preferably 70% or more.
- the upper limit of the blank glossiness is not limited, but is 100% or less.
- the print gloss is an index indicating the gloss of the printed matter after printing, and is measured in the present invention by a method described later.
- the printing glossiness (CM) of the indigo printing portion is preferably 70 or more, and more preferably 75% or more.
- Example 1 A base paper having a basis weight of 75 g / m 2 containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp.
- An undercoat pigment coating solution was coated on both sides of the base paper using a blade coater so that the dry coating amount per one side was 9.5 g / m 2, and dried. Further, a top coat pigment coating solution was coated on both sides with a blade coater so that the dry coating amount per one side was 8.5 g / m 2, and was nipped with a resin roll and a metal roll. The linear pressure was calendered under the conditions shown in Table 1 to obtain a coated paper for printing. The coated paper for printing was evaluated by the method described above.
- Example 2 Coating paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the amount of latex of the undercoat coating liquid was changed.
- Examples 3 and 4 A base paper having a basis weight of 69 g / m 2 and containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp. Using the pigments and adhesives shown in Table 1, an undercoat pigment coating liquid having a solid content of 65% by weight was obtained. Using the pigments and adhesives shown in Table 1, a topcoat pigment coating liquid having a solid content of 65% by weight was obtained. Using these, a coated paper for printing was manufactured and evaluated in the same manner as in Example 1.
- Examples 5 to 8 100% by weight of chemical pulp, 13.5% by weight of light calcium carbonate as a filler, and starch size pressed base paper having a basis weight of 75 g / m 2 were prepared. A pigment coating liquid having a concentration of 65% by weight was obtained. Using these, a coated paper for printing having one pigment coated layer was manufactured and evaluated in the same manner as in Example 1.
- Examples 3 and 4 of the series 1 the use of calcium carbonate having a D50 of 0.80 ⁇ m or less improved the printing surface strength as compared with Comparative Example 4 in which the clay was blended, and suggested that the binder may be reduced. .
- high glossiness was obtained under the same calender conditions as Comparative Example 3 using calcium carbonate having a large average particle diameter.
- Series 2 relates to a single coated paper for printing.
- Examples 5 to 8 in which calcium carbonate having a D50 of 0.80 ⁇ m or less was blended, the glossiness was higher than in Comparative Example 5 in which calcium carbonate having a large average particle diameter was used, as in Series 1 (double coating). Obtained.
- Example 8 although the starch serving as a binder was reduced by 1 part by weight as compared with Example 5, the printing surface strength was maintained at a level having no problem in printing, and there was no large difference between the two.
- the strength can be improved while having the same white paper glossiness as compared with the case of using clay or kaolin, and the amount of adhesive can be reduced. It is apparent that even when the amount of reduction was reduced, a coated paper for printing having the same strength could be obtained. From the above, it is clear that the coated paper for printing of the present invention has a high degree of white paper gloss and excellent strength.
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Abstract
A coated printing paper provided with a pigment-coating layer on at least one surface of a base paper, wherein the outermost pigment-coating layer comprises calcium carbonate with an average particle size (D50) that is greater than 0.50 µm but at most 0.80 µm and the white paper glossiness (75°) is at least 60%.
Description
本発明は高い白紙光沢度と高い強度を備える印刷用塗工紙に関する。
(4) The present invention relates to a coated paper for printing having high glossiness and high strength.
塗工紙は光沢塗工紙と艶消し塗工紙に大別される。光沢塗工紙の中でも高光沢塗工紙には、従来高級印刷に用いられていたアート紙、スーパーアート紙、あるいはカタログ、パンフレットなどに用いられるコート紙等があり、これらは印刷仕上がりにおいて白紙光沢度も印刷光沢度も高いグロス調となる。また、艶消し塗工紙は高光沢塗工紙よりも白紙光沢度や印刷光沢度が低い塗工紙であり、ダル調塗工紙、マット調塗工紙がある。
Coated paper is roughly classified into glossy coated paper and matte coated paper. Among glossy coated papers, high glossy coated papers include art paper, superart paper, and coated paper used for catalogs and pamphlets, which have been used for high-grade printing. The degree of gloss and print gloss are both high. The matte coated paper is a coated paper having a lower white paper glossiness and a lower printed glossiness than a high glossy coated paper, and includes dull coated paper and matte coated paper.
一般的に、高光沢塗工紙においては扁平な顔料であるカオリンまたはクレーを多量に使用することや、光沢発現性が良好なプラスチックピグメントを使用することで白紙光沢度を達成している。カオリンまたはクレーなどの扁平顔料の主面は酸性、側面は塩基性であり(非特許文献1)、塗工紙で一般的に使用されるラテックス等の接着剤は酸性基を含む。したがって、カオリンまたはクレーの主面は酸性であるのでラテックス等の接着剤との親和性が低い。一方、カオリンまたはクレーの側面は塩基性であるので接着剤との親和性が高いが面積が小さく充分な接着面積が達成できないことに起因して、強度の発現効率が低いという問題があった。
Generally, high gloss coated paper achieves white paper gloss by using a large amount of flat pigment kaolin or clay or by using a plastic pigment having good gloss development. The main surface of a flat pigment such as kaolin or clay is acidic and the side surface is basic (Non-Patent Document 1), and an adhesive such as latex generally used for coated paper contains an acidic group. Therefore, since the main surface of kaolin or clay is acidic, affinity with an adhesive such as latex is low. On the other hand, since the side surface of kaolin or clay is basic, it has a high affinity with the adhesive, but has a problem that the efficiency of developing strength is low due to the fact that the area is small and a sufficient bonding area cannot be achieved.
カオリンまたはクレーは黄色~茶色い色味を持つ顔料であり、これを多用した塗工紙は黄色味が強いため、高光沢塗工紙の色相が黄色っぽくなる傾向があった。黄色味はL*a*b*測色系におけるb*で示されるが、黄色味の強い紙はb*値が高くなる傾向がある。黄色味の強い紙に印刷した場合、印刷物全体の黄色味が強くなってしまうため、印刷物の発色が劣る傾向があった。
Kaolin or clay is a pigment having a yellow-brown color. Coated paper that uses a large amount of the pigment has a strong yellow tint, and the hue of high gloss coated paper tends to be yellowish. The yellow tint is represented by b * in the L * a * b * colorimetric system, but paper with a strong yellow tint tends to have a high b * value. When printing is performed on paper having a strong yellow tint, the yellow tint of the entire printed matter becomes strong, so that the color development of the printed matter tends to be inferior.
プラスチックピグメントは、非常に高価な資材であり、チラシ等の汎用の一般光沢塗工紙に使用することは困難であった。また、環境への配慮から有機顔料であるプラスチックピグメントの使用を避ける例が増えてきている。
Plastic pigment is a very expensive material, and it has been difficult to use it for general glossy coated paper such as flyers. Further, the use of plastic pigments, which are organic pigments, has been increasingly avoided in consideration of the environment.
この他に高光沢塗工紙に関して、平均粒子径0.50μm以下の非常に細かい炭酸カルシウムを使用して光沢度を向上させる技術が提案されている(特許文献2)。しかし、粒子径が細かすぎる炭酸カルシムは比表面積も大きくなってしまうため、バインダー要求量が高くなり、結果的に紙力が低下してしまう恐れがあった。
他 In addition to this, a technique has been proposed for improving the glossiness of highly glossy coated paper using very fine calcium carbonate having an average particle size of 0.50 μm or less (Patent Document 2). However, calcium carbonate having a too small particle diameter also has a large specific surface area, so that the required amount of the binder is increased, and as a result, there is a possibility that the paper strength is reduced.
本発明は高い白紙光沢度と高い強度を備える印刷用塗工紙を提供することを課題とする。
。 It is an object of the present invention to provide a coated printing paper having high glossiness of white paper and high strength.
本発明者は上記課題に鑑み、鋭意検討を重ねた結果、特定の微粒炭酸カルシウムを含む顔料塗工層を備える印刷用塗工紙が上記課題を解決することを見出した。すなわち、前記課題は以下の本発明によって解決される。
[1]原紙の少なくとも片面に顔料塗工層を備え、
最外顔料塗層が0.50μmより大きく0.80μm以下の平均粒子径(D50)を有する炭酸カルシウムを含み、
白紙光沢度(75°)が60%以上である、印刷用塗工紙。
[2]前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを40重量部以上含む、[1]に記載の印刷用塗工紙。
[3]前記炭酸カルシウムの平均粒子径(D50)が0.55~0.75μmである、[1]または[2]に記載の印刷用塗工紙。
[4]藍紅印刷部の印刷光沢度が70%以上である[1]~[3]のいずれかに記載の印刷用塗工紙。
[5]前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを75重量部以上含む、[2]に記載の印刷用塗工紙。
[6]複数の顔料塗工層を備え、かつ前記最外顔料塗工層の塗工量が最内顔料塗工層の塗工量より多い、[1]~[5]のいずれかに記載の印刷用塗工紙。
[7]最外塗工層の塗工量が、7g/m2以上である[1]~[6]のいずれかに記載の印刷用塗工紙。 The present inventor has made intensive studies in view of the above problems, and as a result, has found that a printing coated paper provided with a pigment coating layer containing specific fine calcium carbonate can solve the above problems. That is, the above problem is solved by the present invention described below.
[1] A base paper is provided with a pigment coating layer on at least one side thereof,
An outermost pigment coating layer containing calcium carbonate having an average particle diameter (D50) of greater than 0.50 μm and 0.80 μm or less;
A coated paper for printing having a blank glossiness (75 °) of 60% or more.
[2] The coated printing paper according to [1], wherein the calcium carbonate is contained in an amount of 40 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
[3] The coated paper for printing according to [1] or [2], wherein the average particle diameter (D50) of the calcium carbonate is 0.55 to 0.75 μm.
[4] The coated paper for printing according to any one of [1] to [3], wherein the printing gloss of the indigo red printing section is 70% or more.
[5] The coated paper for printing according to [2], wherein the calcium carbonate is contained in an amount of 75 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
[6] The method according to any one of [1] to [5], including a plurality of pigment coating layers, wherein the coating amount of the outermost pigment coating layer is larger than the coating amount of the innermost pigment coating layer. Coated paper for printing.
[7] The coated printing paper according to any one of [1] to [6], wherein the coating amount of the outermost coating layer is 7 g / m 2 or more.
[1]原紙の少なくとも片面に顔料塗工層を備え、
最外顔料塗層が0.50μmより大きく0.80μm以下の平均粒子径(D50)を有する炭酸カルシウムを含み、
白紙光沢度(75°)が60%以上である、印刷用塗工紙。
[2]前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを40重量部以上含む、[1]に記載の印刷用塗工紙。
[3]前記炭酸カルシウムの平均粒子径(D50)が0.55~0.75μmである、[1]または[2]に記載の印刷用塗工紙。
[4]藍紅印刷部の印刷光沢度が70%以上である[1]~[3]のいずれかに記載の印刷用塗工紙。
[5]前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを75重量部以上含む、[2]に記載の印刷用塗工紙。
[6]複数の顔料塗工層を備え、かつ前記最外顔料塗工層の塗工量が最内顔料塗工層の塗工量より多い、[1]~[5]のいずれかに記載の印刷用塗工紙。
[7]最外塗工層の塗工量が、7g/m2以上である[1]~[6]のいずれかに記載の印刷用塗工紙。 The present inventor has made intensive studies in view of the above problems, and as a result, has found that a printing coated paper provided with a pigment coating layer containing specific fine calcium carbonate can solve the above problems. That is, the above problem is solved by the present invention described below.
[1] A base paper is provided with a pigment coating layer on at least one side thereof,
An outermost pigment coating layer containing calcium carbonate having an average particle diameter (D50) of greater than 0.50 μm and 0.80 μm or less;
A coated paper for printing having a blank glossiness (75 °) of 60% or more.
[2] The coated printing paper according to [1], wherein the calcium carbonate is contained in an amount of 40 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
[3] The coated paper for printing according to [1] or [2], wherein the average particle diameter (D50) of the calcium carbonate is 0.55 to 0.75 μm.
[4] The coated paper for printing according to any one of [1] to [3], wherein the printing gloss of the indigo red printing section is 70% or more.
[5] The coated paper for printing according to [2], wherein the calcium carbonate is contained in an amount of 75 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
[6] The method according to any one of [1] to [5], including a plurality of pigment coating layers, wherein the coating amount of the outermost pigment coating layer is larger than the coating amount of the innermost pigment coating layer. Coated paper for printing.
[7] The coated printing paper according to any one of [1] to [6], wherein the coating amount of the outermost coating layer is 7 g / m 2 or more.
本発明により、高い白紙光沢度と高い強度を備える印刷用塗工紙を提供できる。
According to the present invention, it is possible to provide a coated printing paper having high blank gloss and high strength.
以下、本発明を詳細に説明する。本発明において「~」はその端点を含む。すなわち「X~Y」はXおよびYの値を含む。また、「XまたはY」はX、Yのいずれか一つ、あるいは双方を意味する。
Hereinafter, the present invention will be described in detail. In the present invention, “to” includes the end point. That is, “X to Y” includes the values of X and Y. “X or Y” means one or both of X and Y.
1.印刷用塗工紙
印刷用塗工紙とは原紙の上に設けられた顔料塗工層を備える印刷用の紙である。顔料塗工層とは白色顔料を主成分とする層である。本発明の印刷用塗工紙は、最外顔料塗工層が0.50μmより大きく0.80μm以下の平均粒子径(D50)を有する炭酸カルシウムを含有する。本発明の印刷用塗工紙は、用紙表面にオフセット印刷、グラビア印刷、オンデマンド印刷(レーザー方式、インクジェット方式、電子写真方式)、などの商業印刷を施すことができ、用途しては書籍、雑誌、ポスター、封筒、カレンダーなどが挙げられるが、これらに限定されない。 1. Printing Coated Paper Printing coated paper is printing paper provided with a pigment coating layer provided on base paper. The pigment coating layer is a layer containing a white pigment as a main component. The printing coated paper of the present invention contains calcium carbonate having an outermost pigment coating layer having an average particle diameter (D50) of more than 0.50 μm and 0.80 μm or less. The coated printing paper of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser method, ink jet method, and electrophotographic method) on the surface of the paper. Examples include, but are not limited to, magazines, posters, envelopes, calendars, and the like.
印刷用塗工紙とは原紙の上に設けられた顔料塗工層を備える印刷用の紙である。顔料塗工層とは白色顔料を主成分とする層である。本発明の印刷用塗工紙は、最外顔料塗工層が0.50μmより大きく0.80μm以下の平均粒子径(D50)を有する炭酸カルシウムを含有する。本発明の印刷用塗工紙は、用紙表面にオフセット印刷、グラビア印刷、オンデマンド印刷(レーザー方式、インクジェット方式、電子写真方式)、などの商業印刷を施すことができ、用途しては書籍、雑誌、ポスター、封筒、カレンダーなどが挙げられるが、これらに限定されない。 1. Printing Coated Paper Printing coated paper is printing paper provided with a pigment coating layer provided on base paper. The pigment coating layer is a layer containing a white pigment as a main component. The printing coated paper of the present invention contains calcium carbonate having an outermost pigment coating layer having an average particle diameter (D50) of more than 0.50 μm and 0.80 μm or less. The coated printing paper of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser method, ink jet method, and electrophotographic method) on the surface of the paper. Examples include, but are not limited to, magazines, posters, envelopes, calendars, and the like.
(1)顔料塗工層
1)顔料
顔料塗工層は平均粒子径(D50)が0.50μmより大きく0.80μm以下の炭酸カルシウム(以下、「第1の炭酸カルシウム」ともいう)を含む。D50は体積50%平均粒子径である。沈降法による顔料の粒度分布およびD50は、Malvern社製、マスターサイザー3000等により測定可能である。炭酸カルシウムのD50の上限は0.75μm以下であることが好ましく、0.70μm以下であることが好ましい。顔料の比表面積とバインダー要求量の観点から下限は0.55μm以上であることが好ましい。D50上記範囲であれば塗工層が緻密になるため高光沢となり、さらに0.50μm未満の顔料を使用した場合と比較してバインダー要求量が少ないため、優れた強度を備える印刷用塗工紙を得ることができる。 (1) Pigment Coating Layer 1) Pigment The pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 μm and 0.80 μm or less (hereinafter, also referred to as “first calcium carbonate”). D50 is a 50% volume average particle diameter. The particle size distribution and D50 of the pigment by the sedimentation method can be measured by a master sizer 3000 manufactured by Malvern. The upper limit of the D50 of calcium carbonate is preferably 0.75 μm or less, and more preferably 0.70 μm or less. From the viewpoint of the specific surface area of the pigment and the required amount of the binder, the lower limit is preferably 0.55 μm or more. D50 Within the above range, the coating layer becomes dense, resulting in high gloss, and further, since the required amount of the binder is smaller than when a pigment having a particle size of less than 0.50 μm is used, coated printing paper having excellent strength. Can be obtained.
1)顔料
顔料塗工層は平均粒子径(D50)が0.50μmより大きく0.80μm以下の炭酸カルシウム(以下、「第1の炭酸カルシウム」ともいう)を含む。D50は体積50%平均粒子径である。沈降法による顔料の粒度分布およびD50は、Malvern社製、マスターサイザー3000等により測定可能である。炭酸カルシウムのD50の上限は0.75μm以下であることが好ましく、0.70μm以下であることが好ましい。顔料の比表面積とバインダー要求量の観点から下限は0.55μm以上であることが好ましい。D50上記範囲であれば塗工層が緻密になるため高光沢となり、さらに0.50μm未満の顔料を使用した場合と比較してバインダー要求量が少ないため、優れた強度を備える印刷用塗工紙を得ることができる。 (1) Pigment Coating Layer 1) Pigment The pigment coating layer contains calcium carbonate having an average particle diameter (D50) of more than 0.50 μm and 0.80 μm or less (hereinafter, also referred to as “first calcium carbonate”). D50 is a 50% volume average particle diameter. The particle size distribution and D50 of the pigment by the sedimentation method can be measured by a master sizer 3000 manufactured by Malvern. The upper limit of the D50 of calcium carbonate is preferably 0.75 μm or less, and more preferably 0.70 μm or less. From the viewpoint of the specific surface area of the pigment and the required amount of the binder, the lower limit is preferably 0.55 μm or more. D50 Within the above range, the coating layer becomes dense, resulting in high gloss, and further, since the required amount of the binder is smaller than when a pigment having a particle size of less than 0.50 μm is used, coated printing paper having excellent strength. Can be obtained.
顔料塗工層が原紙の両面に存在する場合は、少なくとも一方の面の最外顔料塗工層が第1の炭酸カルシウムを含めばよい。
場合 When the pigment coating layer is present on both sides of the base paper, the outermost pigment coating layer on at least one side may contain the first calcium carbonate.
最外顔料塗工層における第1の炭酸カルシウムの配合量の下限は、当該顔料塗工層中の顔料100重量部中、40重量部以上であることが好ましく、75重量部以上であることがより好ましく、80重量部以上であることがより好ましい。全量を第1の炭酸カルシウムとしてもよい。第1の炭酸カルシウムは、重質炭酸カルシウムまたはパルプ製造工程の苛性化工程で製造された軽質炭酸カルシウム(苛性化軽質炭酸カルシウム、特許5274077号公報参照)であることが好ましい。
The lower limit of the amount of the first calcium carbonate in the outermost pigment coating layer is preferably at least 40 parts by weight, and more preferably at least 75 parts by weight, per 100 parts by weight of the pigment in the pigment coating layer. More preferably, it is more preferably at least 80 parts by weight. The whole may be the first calcium carbonate. The first calcium carbonate is preferably heavy calcium carbonate or light calcium carbonate produced in the causticizing step of the pulp production step (causticized light calcium carbonate, see Japanese Patent No. 5274077).
顔料塗工層中の第1の炭酸カルシウム以外の白色顔料として、当該分野で通常使用されている顔料を用いることができる。その例としては、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が挙げられる。これらの顔料は複数種を組合せて使用してもよい。
顔料 As the white pigment other than the first calcium carbonate in the pigment coating layer, a pigment generally used in the art can be used. Examples include kaolin, clay, engineered kaolin, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide, silicic acid, silicates, colloidal silica, satin Examples include inorganic pigments such as white and organic pigments such as solid type, hollow type, and core-shell type. These pigments may be used in combination of two or more kinds.
第1の炭酸カルシウム以外の白色顔料として、D50が0.80μmを超える重質炭酸カルシウムまたは軽質炭酸カルシウム(以下、「第2の炭酸カルシウム」ともいう)を用いることが好ましい。炭酸カルシウムは接着剤(バインダー)との結着性に優れかつ白色度を向上するので、高い強度、白色度および印刷適性を達成できる。最外顔料塗工層中の顔料100重量部中、第1および第2の炭酸カルシウムの合計量は90重量部以上が好ましく、100重量部がより好ましい。2層以上の顔料塗工層を有する場合、最外塗工層以外の顔料塗工層中の第1および第2の炭酸カルシウムの合計量は限定されないが前記範囲であることが好ましい。第2の炭酸カルシウムは、重質炭酸カルシウムまたは苛性化軽質炭酸カルシウムであることが好ましい。
重 As a white pigment other than the first calcium carbonate, it is preferable to use heavy calcium carbonate or light calcium carbonate having a D50 of more than 0.80 μm (hereinafter, also referred to as “second calcium carbonate”). Calcium carbonate is excellent in binding to an adhesive (binder) and improves whiteness, so that high strength, whiteness and printability can be achieved. In 100 parts by weight of the pigment in the outermost pigment coating layer, the total amount of the first and second calcium carbonates is preferably 90 parts by weight or more, and more preferably 100 parts by weight. When having two or more pigment coating layers, the total amount of the first and second calcium carbonates in the pigment coating layers other than the outermost coating layer is not limited, but is preferably in the above range. Preferably, the second calcium carbonate is heavy calcium carbonate or causticized light calcium carbonate.
2)接着剤
顔料塗工層はマトリックスとして接着剤(バインダー)を含む。接着剤は限定されず、公知の接着剤を使用できる。その例としては、スチレン・ブタジエン系共重合体、スチレン・アクリル系共重合体、エチレン・酢酸ビニル系共重合体、ブタジエン・メチルメタクリレート系共重合体、酢酸ビニル・ブチルアクリレート系共重合体、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等のラテックス;完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、カルボキシ変性ポリビニルアルコール、アセトアセチル変性ポリビニルアルコール等のポリビニルアルコール類;カゼイン、大豆蛋白、合成蛋白等の蛋白質類;酸化澱粉、陽性澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリン等の澱粉類;カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等が挙げられる。これらの複数種を組合せて使用できる。 2) Adhesive The pigment coating layer contains an adhesive (binder) as a matrix. The adhesive is not limited, and a known adhesive can be used. Examples thereof include styrene / butadiene copolymers, styrene / acrylic copolymers, ethylene / vinyl acetate copolymers, butadiene / methyl methacrylate copolymers, vinyl acetate / butyl acrylate copolymers, and anhydrides. Latexes such as maleic acid copolymer and acrylic acid / methyl methacrylate copolymer; polyvinyl alcohols such as completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, and acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as protein and synthetic protein; oxidized starch, positive starch, etherified starch such as urea-phosphate esterified starch, hydroxyethyl etherified starch, and starches such as dextrin; carboxymethylcellulose, hydroxyethylcellulose, hydrate Cellulose derivatives such as carboxymethyl cellulose and the like. These plural types can be used in combination.
顔料塗工層はマトリックスとして接着剤(バインダー)を含む。接着剤は限定されず、公知の接着剤を使用できる。その例としては、スチレン・ブタジエン系共重合体、スチレン・アクリル系共重合体、エチレン・酢酸ビニル系共重合体、ブタジエン・メチルメタクリレート系共重合体、酢酸ビニル・ブチルアクリレート系共重合体、無水マレイン酸共重合体、アクリル酸・メチルメタクリレート系共重合体等のラテックス;完全ケン化ポリビニルアルコール、部分ケン化ポリビニルアルコール、カルボキシ変性ポリビニルアルコール、アセトアセチル変性ポリビニルアルコール等のポリビニルアルコール類;カゼイン、大豆蛋白、合成蛋白等の蛋白質類;酸化澱粉、陽性澱粉、尿素燐酸エステル化澱粉、ヒドロキシエチルエーテル化澱粉などのエーテル化澱粉、デキストリン等の澱粉類;カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等が挙げられる。これらの複数種を組合せて使用できる。 2) Adhesive The pigment coating layer contains an adhesive (binder) as a matrix. The adhesive is not limited, and a known adhesive can be used. Examples thereof include styrene / butadiene copolymers, styrene / acrylic copolymers, ethylene / vinyl acetate copolymers, butadiene / methyl methacrylate copolymers, vinyl acetate / butyl acrylate copolymers, and anhydrides. Latexes such as maleic acid copolymer and acrylic acid / methyl methacrylate copolymer; polyvinyl alcohols such as completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, and acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as protein and synthetic protein; oxidized starch, positive starch, etherified starch such as urea-phosphate esterified starch, hydroxyethyl etherified starch, and starches such as dextrin; carboxymethylcellulose, hydroxyethylcellulose, hydrate Cellulose derivatives such as carboxymethyl cellulose and the like. These plural types can be used in combination.
接着剤の量は、印刷適性、塗工適性の点から、全顔料塗工層中の顔料100重量部に対して5~30重量部であることが好ましく、8~25重量部であることがより好ましい。その上限としては20重量部以下がより好ましく、17重量部以下が最も好ましい。接着剤の総量が30重量部を越える場合、顔料塗工液の粘度が高くなり塗工時に操業トラブルが生じ易い。さらにこの場合、インキの乾燥性が低下する傾向が見られる。一方、接着剤の総量が5重量部未満であると十分な表面強度を得にくくなる。
The amount of the adhesive is preferably 5 to 30 parts by weight, and more preferably 8 to 25 parts by weight based on 100 parts by weight of the pigment in the entire pigment coating layer from the viewpoint of printability and coating suitability. More preferred. The upper limit is more preferably 20 parts by weight or less, and most preferably 17 parts by weight or less. When the total amount of the adhesive exceeds 30 parts by weight, the viscosity of the pigment coating liquid becomes high, and an operation trouble tends to occur during coating. Further, in this case, the drying property of the ink tends to decrease. On the other hand, if the total amount of the adhesive is less than 5 parts by weight, it becomes difficult to obtain sufficient surface strength.
本発明の印刷用塗工紙は、全接着剤中10~80重量%のラテックスを含むことが好ましく、15~70重量%のラテックスを含むことがより好ましい。ラテックスとはエマルションの形態の接着剤である。ラテックスとしてはスチレン・ブタジエン系ラテックスが好ましい。前述のとおり、炭酸カルシウムはカオリンまたはクレーと比較して、ラテックス等の酸性基を有する接着剤との親和性が良好である。このため本発明の印刷用塗工紙にラテックスを使用することで、強度発現性に優れた印刷用塗工紙を得ることができる。本発明の印刷用塗工紙は顔料塗工層を備えるが、2層以上の顔料塗工層を有する場合、原紙に最も近い層は全接着剤中10~80重量%のラテックスを含むことが好ましく、原紙に遠い層は30~60重量%のラテックスを含むことが好ましい。他の接着剤としては澱粉類を用いることが特に好ましく、その量は原紙に最も近い層では全接着剤中30~90重量%であることが好ましく、原紙に遠い層では40~70重量%であることが好ましい。
印刷 The coated printing paper of the present invention preferably contains 10 to 80% by weight of latex in the total adhesive, more preferably 15 to 70% by weight of latex. Latex is an adhesive in the form of an emulsion. As the latex, a styrene / butadiene latex is preferable. As described above, calcium carbonate has better affinity with an adhesive having an acidic group such as latex as compared with kaolin or clay. For this reason, by using latex for the printing coated paper of the present invention, a printing coated paper excellent in strength development can be obtained. The coated printing paper of the present invention is provided with a pigment coated layer, but when having two or more pigment coated layers, the layer closest to the base paper may contain 10 to 80% by weight of latex in the total adhesive. Preferably, the layer remote from the base paper preferably contains 30 to 60% by weight of latex. It is particularly preferred to use starches as the other adhesive, and the amount is preferably 30 to 90% by weight of the total adhesive in the layer closest to the base paper, and 40 to 70% by weight in the layer far from the base paper. Preferably, there is.
3)他の添加剤
顔料塗工層は、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、染料、着色用顔料等、通常の塗工紙用顔料に配合される各種助剤を含んでいてもよい。 3) Other additives If necessary, the pigment coating layer may be used as a dispersant, a thickener, a water retention agent, a defoaming agent, a water-proofing agent, a dye, a pigment for coloring, or the like for a general pigment for coated paper. It may contain various auxiliary agents to be blended.
顔料塗工層は、必要に応じて、分散剤、増粘剤、保水剤、消泡剤、耐水化剤、染料、着色用顔料等、通常の塗工紙用顔料に配合される各種助剤を含んでいてもよい。 3) Other additives If necessary, the pigment coating layer may be used as a dispersant, a thickener, a water retention agent, a defoaming agent, a water-proofing agent, a dye, a pigment for coloring, or the like for a general pigment for coated paper. It may contain various auxiliary agents to be blended.
4)塗工量
顔料塗工層の塗工量は、片面あたり固形分で7g/m2以上が好ましく、10g/m2以上がより好ましく、15g/m2以上がさらに好ましい。塗工量が7g/m2未満では、紙基材表面の凹凸を十分に覆うことができないため、印刷インキの受理性が著しく低下することがあり、また十分な白紙光沢度が得られない場合がある。一方、顔料塗工層の塗工量は、50g/m2以下が好ましく、40g/m2以下がより好ましく、35g/m2以下がさらに好ましい。当該塗工量は片面あたりの全顔料塗工層の合計の値であるが、2層以上の顔料塗工層を有する場合、最内顔料塗工層(原紙に隣接する顔料塗工層)の塗工量は2~15g/m2が好ましく、より好ましくは5~12g/m2である。また、最外顔料塗工層の塗工量は7g/m2以上が好ましく、8g/m2以上がより好ましい。その上限は20g/m2以下が好ましく、15g/m2以下がより好ましい。光沢発現性には、最外塗工層の影響が大きいため、最外塗工層の塗工量は最内顔料塗工層の塗工量よりも多いことが好ましい。 The coating amount of 4) coated amount pigment coating layer is preferably from 7 g / m 2 or more in terms of solid per side content, more preferably 10 g / m 2 or more, further preferably 15 g / m 2 or more. If the coating amount is less than 7 g / m 2 , the unevenness on the surface of the paper base material cannot be sufficiently covered, so that the receptivity of the printing ink may be remarkably reduced. There is. On the other hand, the coating amount of the pigment coating layer is preferably 50 g / m 2 or less, more preferably 40g / m 2, 35g / m 2 or less is more preferred. The coating amount is a total value of all the pigment coating layers per one side. When the coating amount is two or more, the innermost pigment coating layer (the pigment coating layer adjacent to the base paper) is used. The coating amount is preferably 2 to 15 g / m 2 , more preferably 5 to 12 g / m 2 . Further, the coating amount of the outermost pigment coating layer is preferably 7 g / m 2 or more, more preferably 8 g / m 2 or more. Its upper limit is preferably 20 g / m 2 or less, more preferably 15 g / m 2 or less. Since the outermost coating layer has a large influence on the glossiness, the coating amount of the outermost coating layer is preferably larger than the coating amount of the innermost pigment coating layer.
顔料塗工層の塗工量は、片面あたり固形分で7g/m2以上が好ましく、10g/m2以上がより好ましく、15g/m2以上がさらに好ましい。塗工量が7g/m2未満では、紙基材表面の凹凸を十分に覆うことができないため、印刷インキの受理性が著しく低下することがあり、また十分な白紙光沢度が得られない場合がある。一方、顔料塗工層の塗工量は、50g/m2以下が好ましく、40g/m2以下がより好ましく、35g/m2以下がさらに好ましい。当該塗工量は片面あたりの全顔料塗工層の合計の値であるが、2層以上の顔料塗工層を有する場合、最内顔料塗工層(原紙に隣接する顔料塗工層)の塗工量は2~15g/m2が好ましく、より好ましくは5~12g/m2である。また、最外顔料塗工層の塗工量は7g/m2以上が好ましく、8g/m2以上がより好ましい。その上限は20g/m2以下が好ましく、15g/m2以下がより好ましい。光沢発現性には、最外塗工層の影響が大きいため、最外塗工層の塗工量は最内顔料塗工層の塗工量よりも多いことが好ましい。 The coating amount of 4) coated amount pigment coating layer is preferably from 7 g / m 2 or more in terms of solid per side content, more preferably 10 g / m 2 or more, further preferably 15 g / m 2 or more. If the coating amount is less than 7 g / m 2 , the unevenness on the surface of the paper base material cannot be sufficiently covered, so that the receptivity of the printing ink may be remarkably reduced. There is. On the other hand, the coating amount of the pigment coating layer is preferably 50 g / m 2 or less, more preferably 40g / m 2, 35g / m 2 or less is more preferred. The coating amount is a total value of all the pigment coating layers per one side. When the coating amount is two or more, the innermost pigment coating layer (the pigment coating layer adjacent to the base paper) is used. The coating amount is preferably 2 to 15 g / m 2 , more preferably 5 to 12 g / m 2 . Further, the coating amount of the outermost pigment coating layer is preferably 7 g / m 2 or more, more preferably 8 g / m 2 or more. Its upper limit is preferably 20 g / m 2 or less, more preferably 15 g / m 2 or less. Since the outermost coating layer has a large influence on the glossiness, the coating amount of the outermost coating layer is preferably larger than the coating amount of the innermost pigment coating layer.
(2)原紙
1)パルプ
原紙には公知のパルプを使用できる。公知のパルプとしては、化学パルプ、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)、ケモ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)、古紙パルプなどが挙げられる。本発明においては、化学パルプを使用することが好ましい。化学パルプには、クラフトパルプ法により製造したものと、亜硫酸パルプ法により製造されたものがあり、本発明においてはその両方を使用することができるが、クラフト法により製造した化学パルプが生産コストの面から好適である。原料パルプに占める化学パルプの含有量は、白色度等の観点から、全パルプ中60重量%以上が好ましく、80重量%以上がより好ましく、90重量%以上がさらに好ましく、95重量%以上が特に好ましい。 (2) Base paper 1) Pulp Known pulp can be used for base paper. Known pulp includes chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemical ground pulp (CGP), and semi-chemical pulp (SCP). And waste paper pulp. In the present invention, it is preferable to use chemical pulp. Chemical pulp includes those manufactured by the kraft pulp method and those manufactured by the sulfite pulp method.In the present invention, both of them can be used, but the chemical pulp manufactured by the kraft method has a low production cost. It is suitable from the viewpoint. The content of the chemical pulp in the raw material pulp is preferably 60% by weight or more, more preferably 80% by weight or more, further preferably 90% by weight or more, and particularly preferably 95% by weight or more, from the viewpoint of whiteness and the like. preferable.
1)パルプ
原紙には公知のパルプを使用できる。公知のパルプとしては、化学パルプ、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)、ケモ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)、古紙パルプなどが挙げられる。本発明においては、化学パルプを使用することが好ましい。化学パルプには、クラフトパルプ法により製造したものと、亜硫酸パルプ法により製造されたものがあり、本発明においてはその両方を使用することができるが、クラフト法により製造した化学パルプが生産コストの面から好適である。原料パルプに占める化学パルプの含有量は、白色度等の観点から、全パルプ中60重量%以上が好ましく、80重量%以上がより好ましく、90重量%以上がさらに好ましく、95重量%以上が特に好ましい。 (2) Base paper 1) Pulp Known pulp can be used for base paper. Known pulp includes chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemical ground pulp (CGP), and semi-chemical pulp (SCP). And waste paper pulp. In the present invention, it is preferable to use chemical pulp. Chemical pulp includes those manufactured by the kraft pulp method and those manufactured by the sulfite pulp method.In the present invention, both of them can be used, but the chemical pulp manufactured by the kraft method has a low production cost. It is suitable from the viewpoint. The content of the chemical pulp in the raw material pulp is preferably 60% by weight or more, more preferably 80% by weight or more, further preferably 90% by weight or more, and particularly preferably 95% by weight or more, from the viewpoint of whiteness and the like. preferable.
2)填料
原紙には公知の填料を用いてよい。公知の填料としては、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酸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が挙げられる。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。填料として使用する炭酸カルシウムは前述の第1の炭酸カルシウムであってもよいし第2の炭酸カルシウムであってもよいが、軽質炭酸カルシウムが好ましい。紙中填料率は特に制限されないが、1~40重量%が好ましく、10~35重量%がさらに好ましい。原紙の強度等を考慮すると、より好ましくは10~20重量%である。 2) Filler A known filler may be used for the base paper. Known fillers include heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, delamikaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water Inorganic fillers such as amorphous silica produced by neutralization of aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, sodium silicate with a mineral acid, urea-formalin resin, melamine Organic fillers such as a base resin, a polystyrene resin, and a phenol resin are exemplified. Among these, heavy calcium carbonate and light calcium carbonate, which are typical fillers in neutral papermaking and alkali papermaking, are preferably used for improving opacity. The calcium carbonate used as the filler may be the first calcium carbonate or the second calcium carbonate, but light calcium carbonate is preferred. Although the filler ratio in paper is not particularly limited, it is preferably 1 to 40% by weight, more preferably 10 to 35% by weight. In consideration of the strength of the base paper, it is more preferably 10 to 20% by weight.
原紙には公知の填料を用いてよい。公知の填料としては、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酸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が挙げられる。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。填料として使用する炭酸カルシウムは前述の第1の炭酸カルシウムであってもよいし第2の炭酸カルシウムであってもよいが、軽質炭酸カルシウムが好ましい。紙中填料率は特に制限されないが、1~40重量%が好ましく、10~35重量%がさらに好ましい。原紙の強度等を考慮すると、より好ましくは10~20重量%である。 2) Filler A known filler may be used for the base paper. Known fillers include heavy calcium carbonate, light calcium carbonate, clay, silica, light calcium carbonate-silica composite, kaolin, calcined kaolin, delamikaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water Inorganic fillers such as amorphous silica produced by neutralization of aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, sodium silicate with a mineral acid, urea-formalin resin, melamine Organic fillers such as a base resin, a polystyrene resin, and a phenol resin are exemplified. Among these, heavy calcium carbonate and light calcium carbonate, which are typical fillers in neutral papermaking and alkali papermaking, are preferably used for improving opacity. The calcium carbonate used as the filler may be the first calcium carbonate or the second calcium carbonate, but light calcium carbonate is preferred. Although the filler ratio in paper is not particularly limited, it is preferably 1 to 40% by weight, more preferably 10 to 35% by weight. In consideration of the strength of the base paper, it is more preferably 10 to 20% by weight.
3)その他
公知の製紙用添加剤も使用できる。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、カチオン化澱粉などが挙げられ、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。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。内添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、ロジンサイズ剤などが挙げられる。更に、染料、顔料、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。 3) Other Known additives for papermaking can also be used. For example, a papermaking internal additive such as a sulfuric acid band or various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers or internal sizing agents may be used as required. 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. These chemicals are added within a range that does not affect formation or operability. Examples of the internal sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent. Further, dyes, pigments, fluorescent brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be added as necessary.
公知の製紙用添加剤も使用できる。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、カチオン化澱粉などが挙げられ、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。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。内添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、ロジンサイズ剤などが挙げられる。更に、染料、顔料、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。 3) Other Known additives for papermaking can also be used. For example, a papermaking internal additive such as a sulfuric acid band or various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers or internal sizing agents may be used as required. 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. These chemicals are added within a range that does not affect formation or operability. Examples of the internal sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent. Further, dyes, pigments, fluorescent brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be added as necessary.
4)原紙の坪量
本発明の印刷用塗工紙の原紙の坪量は40~160g/m2が好ましく、45~150g/m2がより好ましく、50~140g/m2がさらに好ましい。 4) The basis weight of base paper coated printing paper having a basis weight of the present invention of the base paper is preferably 40 ~ 160g / m 2, more preferably 45 ~ 150g / m 2, more preferably 50 ~ 140g / m 2.
本発明の印刷用塗工紙の原紙の坪量は40~160g/m2が好ましく、45~150g/m2がより好ましく、50~140g/m2がさらに好ましい。 4) The basis weight of base paper coated printing paper having a basis weight of the present invention of the base paper is preferably 40 ~ 160g / m 2, more preferably 45 ~ 150g / m 2, more preferably 50 ~ 140g / m 2.
5)クリア塗工層
本発明の印刷用塗工紙は、上述した原紙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適性を向上させることができる。クリア塗工の量は、片面あたり固形分で0.1~3.0g/m2が好ましく、0.2~2.0g/m2がより好ましく、さらに好ましくは0.5~2.0g/m2である。 5) Clear Coated Layer The coated paper for printing of the present invention may have a clear (transparent) coated layer on one or both sides of the above-described base paper. By applying the clear coating on the base paper, the surface strength and smoothness of the base paper can be improved, and the coating suitability at the time of pigment coating can be improved. The amount of the clear coating is preferably 0.1 to 3.0 g / m 2 , more preferably 0.2 to 2.0 g / m 2 , and still more preferably 0.5 to 2.0 g / m 2 in terms of solids per side. m 2 .
本発明の印刷用塗工紙は、上述した原紙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適性を向上させることができる。クリア塗工の量は、片面あたり固形分で0.1~3.0g/m2が好ましく、0.2~2.0g/m2がより好ましく、さらに好ましくは0.5~2.0g/m2である。 5) Clear Coated Layer The coated paper for printing of the present invention may have a clear (transparent) coated layer on one or both sides of the above-described base paper. By applying the clear coating on the base paper, the surface strength and smoothness of the base paper can be improved, and the coating suitability at the time of pigment coating can be improved. The amount of the clear coating is preferably 0.1 to 3.0 g / m 2 , more preferably 0.2 to 2.0 g / m 2 , and still more preferably 0.5 to 2.0 g / m 2 in terms of solids per side. m 2 .
本発明においてクリア塗工とは、例えば、2ロールポンドサイズプレス、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(塗工機)を使用して、澱粉、酸化澱粉、各種変性澱粉(自家変性、カチオン変性等)などの澱粉類、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塗工液(表面処理液)を、原紙上に塗布塗工(サイズプレス)することをいう。クリア塗工液にサイズ剤を含有させて塗工することもできる。本発明においては澱粉を塗工することが好ましい。
In the present invention, the clear coating means, for example, using a coater (coating machine) such as a two-roll pound size press, a gate roll coater, a pre-metalling size press, a curtain coater, and a spray coater, to obtain starch, oxidized starch, A coating liquid (surface treatment liquid) mainly composed of starches such as various modified starches (self-modified, cationic modified, etc.) and water-soluble polymers such as polyacrylamide and polyvinyl alcohol is coated on base paper ( Size press). The clear coating solution can be coated with a sizing agent. In the present invention, it is preferable to apply starch.
2.製造方法
本発明の印刷用塗工紙は公知の方法で製造できるが、原紙上に、顔料と接着剤を含む顔料塗工液を塗工することにより製造することが好ましい。 2. Production Method The coated paper for printing of the present invention can be produced by a known method, but is preferably produced by applying a pigment coating solution containing a pigment and an adhesive on base paper.
本発明の印刷用塗工紙は公知の方法で製造できるが、原紙上に、顔料と接着剤を含む顔料塗工液を塗工することにより製造することが好ましい。 2. Production Method The coated paper for printing of the present invention can be produced by a known method, but is preferably produced by applying a pigment coating solution containing a pigment and an adhesive on base paper.
(1)原紙の調製
本発明で用いられる原紙に使用される原料についてはすでに述べたとおりである。原紙は公知の抄紙方法で製造される。例えば、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る。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。抄紙速度も特に限定されない。本発明で用いられる原紙は、単層でも多層でもよいが、単層の原紙が好適に使用される。 (1) Preparation of base paper Raw materials used for base paper used in the present invention are as described above. The base paper is manufactured by a known paper making method. For example, using a fourdrinier paper machine including a top wire, an on-top former, a gap former, a round net paper machine, a paperboard paper machine combining a fourdrinier paper machine and a round net paper machine, a Yankee dryer machine, or the like. Can be. The pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline. The papermaking speed is not particularly limited. The base paper used in the present invention may be a single layer or a multilayer, but a single layer base paper is preferably used.
本発明で用いられる原紙に使用される原料についてはすでに述べたとおりである。原紙は公知の抄紙方法で製造される。例えば、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る。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。抄紙速度も特に限定されない。本発明で用いられる原紙は、単層でも多層でもよいが、単層の原紙が好適に使用される。 (1) Preparation of base paper Raw materials used for base paper used in the present invention are as described above. The base paper is manufactured by a known paper making method. For example, using a fourdrinier paper machine including a top wire, an on-top former, a gap former, a round net paper machine, a paperboard paper machine combining a fourdrinier paper machine and a round net paper machine, a Yankee dryer machine, or the like. Can be. The pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline. The papermaking speed is not particularly limited. The base paper used in the present invention may be a single layer or a multilayer, but a single layer base paper is preferably used.
(2)原紙の平滑化処理
得られた原紙に顔料塗工液を塗工する前に、各種カレンダー装置により原紙に平滑化処理を施すことが好ましい。かかるカレンダー装置としては、スーパーカレンダー、ソフトカレンダー等の一般に使用されているカレンダー装置が適宜使用できる。カレンダー仕上げ条件としては、剛性ロールの温度、カレンダー圧力、ニップ数、ロール速度、カレンダー前の紙水分等が、要求される品質に応じて適宜選択される。原紙にカレンダー処理を施すことで、原紙の平滑性が向上し、顔料塗工適性が向上する。 (2) Smoothing treatment of base paper Before applying the pigment coating liquid to the obtained base paper, it is preferable to apply a smoothing treatment to the base paper by using various calenders. As such a calendar device, a commonly used calendar device such as a super calendar or a soft calendar can be appropriately used. As the calendering conditions, the temperature of the rigid roll, the calender pressure, the number of nips, the roll speed, the paper moisture before calendering, and the like are appropriately selected according to the required quality. By performing calendering on the base paper, the smoothness of the base paper is improved, and the suitability for pigment coating is improved.
得られた原紙に顔料塗工液を塗工する前に、各種カレンダー装置により原紙に平滑化処理を施すことが好ましい。かかるカレンダー装置としては、スーパーカレンダー、ソフトカレンダー等の一般に使用されているカレンダー装置が適宜使用できる。カレンダー仕上げ条件としては、剛性ロールの温度、カレンダー圧力、ニップ数、ロール速度、カレンダー前の紙水分等が、要求される品質に応じて適宜選択される。原紙にカレンダー処理を施すことで、原紙の平滑性が向上し、顔料塗工適性が向上する。 (2) Smoothing treatment of base paper Before applying the pigment coating liquid to the obtained base paper, it is preferable to apply a smoothing treatment to the base paper by using various calenders. As such a calendar device, a commonly used calendar device such as a super calendar or a soft calendar can be appropriately used. As the calendering conditions, the temperature of the rigid roll, the calender pressure, the number of nips, the roll speed, the paper moisture before calendering, and the like are appropriately selected according to the required quality. By performing calendering on the base paper, the smoothness of the base paper is improved, and the suitability for pigment coating is improved.
(3)顔料塗工液の調製
顔料塗工液は顔料、接着剤、および必要に応じて添加剤を水に分散または溶解することで調製できる。前述の顔料塗工層を形成できるように各成分の配合は調整される。ブレード塗工を行う場合は、顔料塗工液の固形分濃度は40~70重量%が好ましく、より好ましくは60~70重量%である。顔料塗工液の粘度は室温にて60rpmで測定したB型粘度が500~5000mPa・sの範囲であることが好ましい。また、ロールコーターで塗工を行う場合は、顔料塗工液の固形分は30~60重量%が好ましく、より好ましくは40~60重量%である。固形分重量が低すぎるとブレード塗工ではバックフロー等が起きてしまい、高すぎるとブレード負荷が大きくなりブレードの摩耗が進む、ロールコーターではボイリングが発生するなど、操業性に影響が出る。 (3) Preparation of pigment coating liquid The pigment coating liquid can be prepared by dispersing or dissolving a pigment, an adhesive, and, as needed, an additive in water. The composition of each component is adjusted so that the above-mentioned pigment coating layer can be formed. When performing blade coating, the solid content concentration of the pigment coating liquid is preferably 40 to 70% by weight, more preferably 60 to 70% by weight. The viscosity of the pigment coating solution is preferably such that the B-type viscosity measured at room temperature at 60 rpm is in the range of 500 to 5000 mPa · s. When the coating is performed by a roll coater, the solid content of the pigment coating liquid is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content weight is too low, backflow or the like occurs in blade coating, while if it is too high, operability is affected, such as increasing the blade load and abrasion of the blade, and generating rolls in a roll coater.
顔料塗工液は顔料、接着剤、および必要に応じて添加剤を水に分散または溶解することで調製できる。前述の顔料塗工層を形成できるように各成分の配合は調整される。ブレード塗工を行う場合は、顔料塗工液の固形分濃度は40~70重量%が好ましく、より好ましくは60~70重量%である。顔料塗工液の粘度は室温にて60rpmで測定したB型粘度が500~5000mPa・sの範囲であることが好ましい。また、ロールコーターで塗工を行う場合は、顔料塗工液の固形分は30~60重量%が好ましく、より好ましくは40~60重量%である。固形分重量が低すぎるとブレード塗工ではバックフロー等が起きてしまい、高すぎるとブレード負荷が大きくなりブレードの摩耗が進む、ロールコーターではボイリングが発生するなど、操業性に影響が出る。 (3) Preparation of pigment coating liquid The pigment coating liquid can be prepared by dispersing or dissolving a pigment, an adhesive, and, as needed, an additive in water. The composition of each component is adjusted so that the above-mentioned pigment coating layer can be formed. When performing blade coating, the solid content concentration of the pigment coating liquid is preferably 40 to 70% by weight, more preferably 60 to 70% by weight. The viscosity of the pigment coating solution is preferably such that the B-type viscosity measured at room temperature at 60 rpm is in the range of 500 to 5000 mPa · s. When the coating is performed by a roll coater, the solid content of the pigment coating liquid is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content weight is too low, backflow or the like occurs in blade coating, while if it is too high, operability is affected, such as increasing the blade load and abrasion of the blade, and generating rolls in a roll coater.
(4)塗工方法
塗工方法は限定されず、ロールコーター、ブレードコーター等の公知の塗工方法を用いることができる。塗工速度も特に限定されないが、ブレードコーターの場合は400~1800m/分、ロールコーターの場合は400~2000m/分が好ましい。本発明においては、顔料塗工層を1層ブレードコーターで塗工してもよく、ロールコーターで塗工した後にブレードコーターで塗工してもよいし、ブレードコーターで塗工した後にブレードコーターで塗工してもよいが、表面の平滑性を向上させることができるため、最外塗工層の塗工にブレードコーターを用いることが好ましい。 (4) Coating method The coating method is not limited, and a known coating method such as a roll coater or a blade coater can be used. The coating speed is not particularly limited, but is preferably 400 to 1800 m / min for a blade coater and 400 to 2000 m / min for a roll coater. In the present invention, the pigment coating layer may be coated with a one-layer blade coater, may be coated with a roll coater and then coated with a blade coater, or may be coated with a blade coater and then coated with a blade coater. Although coating may be performed, it is preferable to use a blade coater for coating the outermost coating layer because the surface smoothness can be improved.
塗工方法は限定されず、ロールコーター、ブレードコーター等の公知の塗工方法を用いることができる。塗工速度も特に限定されないが、ブレードコーターの場合は400~1800m/分、ロールコーターの場合は400~2000m/分が好ましい。本発明においては、顔料塗工層を1層ブレードコーターで塗工してもよく、ロールコーターで塗工した後にブレードコーターで塗工してもよいし、ブレードコーターで塗工した後にブレードコーターで塗工してもよいが、表面の平滑性を向上させることができるため、最外塗工層の塗工にブレードコーターを用いることが好ましい。 (4) Coating method The coating method is not limited, and a known coating method such as a roll coater or a blade coater can be used. The coating speed is not particularly limited, but is preferably 400 to 1800 m / min for a blade coater and 400 to 2000 m / min for a roll coater. In the present invention, the pigment coating layer may be coated with a one-layer blade coater, may be coated with a roll coater and then coated with a blade coater, or may be coated with a blade coater and then coated with a blade coater. Although coating may be performed, it is preferable to use a blade coater for coating the outermost coating layer because the surface smoothness can be improved.
本発明の印刷用塗工紙は少なくとも片面に顔料塗工層を有しており、2層以上の顔料塗工層を設けてもよい。顔料塗工層を2層以上とした場合、繊維被覆性が向上し、平滑度も高くなる。3層以上とすると塗工量を増やすことができるため塗工紙の品質は向上するが、コストや操業性の点から層数は1層または2層であることが好ましい。前述のとおり原紙の上にクリア塗工層を設け、その上に顔料塗工層を設けてもよい。
印刷 The coated printing paper of the present invention has a pigment coated layer on at least one side, and may have two or more pigment coated layers. When the number of the pigment coating layers is two or more, the fiber covering property is improved and the smoothness is also increased. When the number of layers is three or more, the quality of coated paper is improved because the amount of coating can be increased, but the number of layers is preferably one or two from the viewpoint of cost and operability. As described above, a clear coating layer may be provided on the base paper, and a pigment coating layer may be provided thereon.
(5)その他の工程
湿潤状態の塗工層を乾燥させる方法は限定されず、例えば蒸気加熱シリンダ、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を用いることができる。 (5) Other Steps The method for drying the wet coating layer is not limited, and for example, a steam heating cylinder, a heated hot air dryer, a gas heater dryer, an electric heater dryer, an infrared heater dryer, or the like can be used.
湿潤状態の塗工層を乾燥させる方法は限定されず、例えば蒸気加熱シリンダ、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を用いることができる。 (5) Other Steps The method for drying the wet coating layer is not limited, and for example, a steam heating cylinder, a heated hot air dryer, a gas heater dryer, an electric heater dryer, an infrared heater dryer, or the like can be used.
本発明印刷用塗工紙は、以上のように製造した塗工紙を表面処理してもよく、高い光沢度を得るためにカレンダー処理を行うことが好ましい。カレンダー処理を行う場合には、スーパーカレンダー、ソフトカレンダー等の一般に使用されているカレンダー装置が適宜使用できる。カレンダー仕上げ条件としては、剛性ロールの温度、カレンダー圧力、ニップ数、ロール速度、カレンダー前の紙水分等が、要求される品質に応じて適宜選択されるが、本発明の印刷用塗工紙においてはホットソフトニップカレンダー処理を行うことがより好ましい。当該処理条件は線圧140~300kN/m、温度70~300℃で、5ニップ以上が好ましい。処理速度は200~800m/min程度である。
印刷 The coated paper for printing of the present invention may be subjected to a surface treatment on the coated paper produced as described above, and is preferably subjected to a calender treatment in order to obtain a high glossiness. In the case of performing a calendar process, a commonly used calendar device such as a super calendar or a soft calendar can be used as appropriate. As the calendering conditions, the temperature of the rigid roll, the calender pressure, the number of nips, the roll speed, the paper moisture before calendering, etc., are appropriately selected according to the required quality, but in the coated paper for printing of the present invention. More preferably, hot soft nip calendering is performed. The processing conditions are preferably a linear pressure of 140 to 300 kN / m, a temperature of 70 to 300 ° C. and 5 nips or more. The processing speed is about 200 to 800 m / min.
3.紙質
(1)白紙光沢度
白紙光沢度は白紙での光沢度合いを示す指標であり、本発明においてはJIS-P8142に従い測定される、紙面の法線に対して75°の角度における鏡面光沢度である。本発明の印刷用塗工紙は、白紙光沢度の高い高光沢な印刷用塗工紙である。本発明の印刷用塗工紙の白紙光沢度は60%以上であり、65%以上が好ましく、70%以上がより好ましい。白紙光沢度の上限は限定されないが、100%以下である。 3. Paper quality (1) Blank glossiness Blank glossiness is an index indicating the glossiness of blank paper. In the present invention, the glossiness is measured in accordance with JIS-P8142. is there. The coated printing paper of the present invention is a high-gloss printing coated paper having a high degree of white paper gloss. The white paper glossiness of the coated paper for printing of the present invention is 60% or more, preferably 65% or more, more preferably 70% or more. The upper limit of the blank glossiness is not limited, but is 100% or less.
(1)白紙光沢度
白紙光沢度は白紙での光沢度合いを示す指標であり、本発明においてはJIS-P8142に従い測定される、紙面の法線に対して75°の角度における鏡面光沢度である。本発明の印刷用塗工紙は、白紙光沢度の高い高光沢な印刷用塗工紙である。本発明の印刷用塗工紙の白紙光沢度は60%以上であり、65%以上が好ましく、70%以上がより好ましい。白紙光沢度の上限は限定されないが、100%以下である。 3. Paper quality (1) Blank glossiness Blank glossiness is an index indicating the glossiness of blank paper. In the present invention, the glossiness is measured in accordance with JIS-P8142. is there. The coated printing paper of the present invention is a high-gloss printing coated paper having a high degree of white paper gloss. The white paper glossiness of the coated paper for printing of the present invention is 60% or more, preferably 65% or more, more preferably 70% or more. The upper limit of the blank glossiness is not limited, but is 100% or less.
(2)印刷光沢度
印刷光沢度は、印刷後の印刷物の光沢度合を示す指標であり、本発明においては後述の方法で測定される。藍紅印刷部の印刷光沢度(CM)は70以上が好ましく、75%以上が好ましい。 (2) Print Gloss The print gloss is an index indicating the gloss of the printed matter after printing, and is measured in the present invention by a method described later. The printing glossiness (CM) of the indigo printing portion is preferably 70 or more, and more preferably 75% or more.
印刷光沢度は、印刷後の印刷物の光沢度合を示す指標であり、本発明においては後述の方法で測定される。藍紅印刷部の印刷光沢度(CM)は70以上が好ましく、75%以上が好ましい。 (2) Print Gloss The print gloss is an index indicating the gloss of the printed matter after printing, and is measured in the present invention by a method described later. The printing glossiness (CM) of the indigo printing portion is preferably 70 or more, and more preferably 75% or more.
以下に実施例を挙げて、本発明を具体的に説明するがこれらによって本発明は限定されない。重量部および重量%は固形分換算の値である。
本 The present invention will be specifically described below with reference to examples, but the present invention is not limited by these. Parts by weight and% by weight are values in terms of solid content.
<評価方法>
(1)坪量
JIS P 8124に準じて測定した。
(2)ISO白色度:JIS P8148に準拠し、村上色彩(株)製色差計CMS-35SPXにて、紫外光を含む条件にて測定した。
(3)白紙光沢度
JIS-P8142に基づいて測定した。
(4)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(株)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となる様に藍紅(CM)の順に印刷した。得られた印刷物の藍紅(CM)ベタ印刷部の光沢度を、JIS P-8142に基づいて測定した。
(5)印刷表面強度
RI-I型印刷機(明製作所製)を用い、印刷用インキ(東洋インキ製NEX-Y)を使用して印刷後、ゴムロールについて印刷跡を転写紙に手動で転写してピッキングの程度を目視で相対評価した。評価基準は以下の通りである。
A=ほとんど発生しない、B=発生する <Evaluation method>
(1) Basis Weight Measured according to JIS P 8124.
(2) ISO whiteness: Measured with a color difference meter CMS-35SPX manufactured by Murakami Color Co., Ltd. under conditions including ultraviolet light in accordance with JIS P8148.
(3) Glossiness of white paper It was measured based on JIS-P8142.
(4) Printing Gloss Using a sheet-fed offset printing press (4 colors) manufactured by Roland Co., Ltd., using an ink for offset sheet-fed printing (NEX-M manufactured by Toyo Ink Co., Ltd.) at a printing speed of 8000 sheets / hr, a solid ink. Printing was performed in the order of indigo (CM) so that the inking density was 1.60 and indigo 1.50. The glossiness of the indigo (CM) solid printed portion of the obtained printed matter was measured based on JIS P-8142.
(5) Printing surface strength After printing using a printing ink (NEX-Y manufactured by Toyo Ink) using a RI-I type printing machine (manufactured by Meiji Seisakusho), the print marks on the rubber roll are manually transferred to transfer paper. The degree of picking was visually evaluated relative to each other. The evaluation criteria are as follows.
A = rarely occurs, B = occurs
(1)坪量
JIS P 8124に準じて測定した。
(2)ISO白色度:JIS P8148に準拠し、村上色彩(株)製色差計CMS-35SPXにて、紫外光を含む条件にて測定した。
(3)白紙光沢度
JIS-P8142に基づいて測定した。
(4)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(株)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となる様に藍紅(CM)の順に印刷した。得られた印刷物の藍紅(CM)ベタ印刷部の光沢度を、JIS P-8142に基づいて測定した。
(5)印刷表面強度
RI-I型印刷機(明製作所製)を用い、印刷用インキ(東洋インキ製NEX-Y)を使用して印刷後、ゴムロールについて印刷跡を転写紙に手動で転写してピッキングの程度を目視で相対評価した。評価基準は以下の通りである。
A=ほとんど発生しない、B=発生する <Evaluation method>
(1) Basis Weight Measured according to JIS P 8124.
(2) ISO whiteness: Measured with a color difference meter CMS-35SPX manufactured by Murakami Color Co., Ltd. under conditions including ultraviolet light in accordance with JIS P8148.
(3) Glossiness of white paper It was measured based on JIS-P8142.
(4) Printing Gloss Using a sheet-fed offset printing press (4 colors) manufactured by Roland Co., Ltd., using an ink for offset sheet-fed printing (NEX-M manufactured by Toyo Ink Co., Ltd.) at a printing speed of 8000 sheets / hr, a solid ink. Printing was performed in the order of indigo (CM) so that the inking density was 1.60 and indigo 1.50. The glossiness of the indigo (CM) solid printed portion of the obtained printed matter was measured based on JIS P-8142.
(5) Printing surface strength After printing using a printing ink (NEX-Y manufactured by Toyo Ink) using a RI-I type printing machine (manufactured by Meiji Seisakusho), the print marks on the rubber roll are manually transferred to transfer paper. The degree of picking was visually evaluated relative to each other. The evaluation criteria are as follows.
A = rarely occurs, B = occurs
<材料>
以下を用いた。
(1)重質炭酸カルシウム
株式会社ファイマテック製、商品名:FMT97、D50=0.88μm
株式会社ファイマテック製、商品名:FMT75、D50=1.65μm
株式会社ファイマテック製、商品名:カービタル90、D50=1.22μm
株式会社ファイマテック製、商品名:FMT100YF、D50=0.59μm
株式会社ファイマテック製、商品名:FMT100、D50=0.65μm
株式会社イメリスミネラルズ・ジャパン製、商品名:カービタル97、D50=0.88μm
(2)クレー
Kamin社製、ハイドラグロス D50=0.22μm
イメリスミネラルズ・ジャパン製、プレミア、D50=2.055μm
(3)接着剤
スチレン・ブタジエン系共重合ラテックス
澱粉:
ダイナコート68NB(ジー・エス・エルジャパン株式会社製)
バイオラテックス(Ecosynthetix社製)
(4)染料
紫染料(御国色素株式会社製)
青染料(御国色素株式会社製)
黒染料(御国色素株式会社製)
蛍光染料:canwhite(カナジアジャパン社製) <Material>
The following was used.
(1) Heavy calcium carbonate, manufactured by FIMATECH, trade name: FMT97, D50 = 0.88 μm
Product name: FMT75, D50 = 1.65 μm
Product name: Carbital 90, D50 = 1.22 μm
Product name: FMT100YF, D50 = 0.59 μm
Product name: FMT100, D50 = 0.65 μm
Product name: Carbital 97, D50 = 0.88 μm, manufactured by Imeris Minerals Japan Co., Ltd.
(2) Clay, manufactured by Kamin Co., Ltd., Hydra Gloss D50 = 0.22 μm
Made by Imeris Minerals Japan, Premier, D50 = 2.055 μm
(3) Adhesive Styrene / butadiene copolymer latex Starch:
Dynacote 68NB (GSL Japan Co., Ltd.)
Biolatex (Ecosynthetics)
(4) Dye Purple dye (manufactured by Mikuni Pigment Co., Ltd.)
Blue dye (manufactured by Okuni Pigment Co., Ltd.)
Black dye (Mokoku Shigyo Co., Ltd.)
Fluorescent dye: canwhite (manufactured by Canadian Japan)
以下を用いた。
(1)重質炭酸カルシウム
株式会社ファイマテック製、商品名:FMT97、D50=0.88μm
株式会社ファイマテック製、商品名:FMT75、D50=1.65μm
株式会社ファイマテック製、商品名:カービタル90、D50=1.22μm
株式会社ファイマテック製、商品名:FMT100YF、D50=0.59μm
株式会社ファイマテック製、商品名:FMT100、D50=0.65μm
株式会社イメリスミネラルズ・ジャパン製、商品名:カービタル97、D50=0.88μm
(2)クレー
Kamin社製、ハイドラグロス D50=0.22μm
イメリスミネラルズ・ジャパン製、プレミア、D50=2.055μm
(3)接着剤
スチレン・ブタジエン系共重合ラテックス
澱粉:
ダイナコート68NB(ジー・エス・エルジャパン株式会社製)
バイオラテックス(Ecosynthetix社製)
(4)染料
紫染料(御国色素株式会社製)
青染料(御国色素株式会社製)
黒染料(御国色素株式会社製)
蛍光染料:canwhite(カナジアジャパン社製) <Material>
The following was used.
(1) Heavy calcium carbonate, manufactured by FIMATECH, trade name: FMT97, D50 = 0.88 μm
Product name: FMT75, D50 = 1.65 μm
Product name: Carbital 90, D50 = 1.22 μm
Product name: FMT100YF, D50 = 0.59 μm
Product name: FMT100, D50 = 0.65 μm
Product name: Carbital 97, D50 = 0.88 μm, manufactured by Imeris Minerals Japan Co., Ltd.
(2) Clay, manufactured by Kamin Co., Ltd., Hydra Gloss D50 = 0.22 μm
Made by Imeris Minerals Japan, Premier, D50 = 2.055 μm
(3) Adhesive Styrene / butadiene copolymer latex Starch:
Dynacote 68NB (GSL Japan Co., Ltd.)
Biolatex (Ecosynthetics)
(4) Dye Purple dye (manufactured by Mikuni Pigment Co., Ltd.)
Blue dye (manufactured by Okuni Pigment Co., Ltd.)
Black dye (Mokoku Shigyo Co., Ltd.)
Fluorescent dye: canwhite (manufactured by Canadian Japan)
<シリーズ3>
[実施例1]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有する坪量75g/m2の原紙を準備した。 <Series 3>
[Example 1]
A base paper having a basis weight of 75 g / m 2 containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp.
[実施例1]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有する坪量75g/m2の原紙を準備した。 <Series 3>
[Example 1]
A base paper having a basis weight of 75 g / m 2 containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp.
顔料として重質炭酸カルシウム(株式会社ファイマテック製、商品名:FMT97、D50=0.88μm)100重量部を用い、これに接着剤としてスチレン・ブタジエン系共重合ラテックスを3重量部、酸化澱粉を6重量部配合して、さらに水を加えて固形分濃度65重量%の下塗り顔料塗工液を得た。
As a pigment, 100 parts by weight of heavy calcium carbonate (trade name: FMT97, D50 = 0.88 μm, manufactured by Fimatec Corporation), 3 parts by weight of a styrene / butadiene copolymer latex as an adhesive, and starch oxide were used. 6 parts by weight were added, and water was further added to obtain an undercoat pigment coating liquid having a solid content of 65% by weight.
第1の炭酸カルシウムである微粒重質炭酸カルシウム(株式会社ファイマテック製、商品名:100YF、D50=0.59μm)100重量部を用い、これに接着剤としてスチレン・ブタジエン系共重合ラテックスを7.7重量部、澱粉系バインダー「バイオラテックス」を1.3部(表中BLxと表記)、表1に示すとおりに各染料を配合して、さらに水を加えて固形分濃度66重量%の上塗り顔料塗工液を得た。
100 parts by weight of fine heavy calcium carbonate (product name: 100YF, D50 = 0.59 μm, manufactured by Fimatec Co., Ltd.) as the first calcium carbonate was used, and a styrene / butadiene copolymer latex was used as an adhesive. 0.7 parts by weight, 1.3 parts (expressed as BLx in the table) of a starch-based binder "biolatex", each dye was blended as shown in Table 1, and water was further added to give a solid content of 66% by weight. An overcoat pigment coating solution was obtained.
前記原紙上に、下塗り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9.5g/m2となるように両面塗工し乾燥した。さらに、その上に上塗り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8.5g/m2となるように両面塗工し、樹脂ロールと金属ロールにてニップされ、温度とニップ線圧は表1に示す条件でカレンダー処理を行い、印刷用塗工紙を得た。当該印刷用塗工紙について、前述の方法にて評価した。
An undercoat pigment coating solution was coated on both sides of the base paper using a blade coater so that the dry coating amount per one side was 9.5 g / m 2, and dried. Further, a top coat pigment coating solution was coated on both sides with a blade coater so that the dry coating amount per one side was 8.5 g / m 2, and was nipped with a resin roll and a metal roll. The linear pressure was calendered under the conditions shown in Table 1 to obtain a coated paper for printing. The coated paper for printing was evaluated by the method described above.
[実施例2]
下塗り塗工液のラテックス量を変更した以外は実施例1と同様にして印刷用塗工紙を製造して評価した。 [Example 2]
Coating paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the amount of latex of the undercoat coating liquid was changed.
下塗り塗工液のラテックス量を変更した以外は実施例1と同様にして印刷用塗工紙を製造して評価した。 [Example 2]
Coating paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the amount of latex of the undercoat coating liquid was changed.
[比較例1、2]
表1に示した塗工液を用いた以外は、実施例1と同様にして印刷用塗工紙を製造して評価した。 [Comparative Examples 1 and 2]
Coating paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the coating liquids shown in Table 1 were used.
表1に示した塗工液を用いた以外は、実施例1と同様にして印刷用塗工紙を製造して評価した。 [Comparative Examples 1 and 2]
Coating paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the coating liquids shown in Table 1 were used.
<シリーズ1>
[実施例3、4]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有する坪量69g/m2の原紙を準備した。
表1に示す顔料、接着剤を用いて固形分濃度65重量%の下塗り顔料塗工液を得た。表1に示す顔料、接着剤を用いて固形分濃度65重量%の上塗り顔料塗工液を得た。
これらを用いて、実施例1と同様に印刷用塗工紙を製造して評価した。 <Series 1>
[Examples 3 and 4]
A base paper having a basis weight of 69 g / m 2 and containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp.
Using the pigments and adhesives shown in Table 1, an undercoat pigment coating liquid having a solid content of 65% by weight was obtained. Using the pigments and adhesives shown in Table 1, a topcoat pigment coating liquid having a solid content of 65% by weight was obtained.
Using these, a coated paper for printing was manufactured and evaluated in the same manner as in Example 1.
[実施例3、4]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有する坪量69g/m2の原紙を準備した。
表1に示す顔料、接着剤を用いて固形分濃度65重量%の下塗り顔料塗工液を得た。表1に示す顔料、接着剤を用いて固形分濃度65重量%の上塗り顔料塗工液を得た。
これらを用いて、実施例1と同様に印刷用塗工紙を製造して評価した。 <Series 1>
[Examples 3 and 4]
A base paper having a basis weight of 69 g / m 2 and containing 13.5% by weight of light calcium carbonate as a filler was prepared using 100% by weight of chemical pulp.
Using the pigments and adhesives shown in Table 1, an undercoat pigment coating liquid having a solid content of 65% by weight was obtained. Using the pigments and adhesives shown in Table 1, a topcoat pigment coating liquid having a solid content of 65% by weight was obtained.
Using these, a coated paper for printing was manufactured and evaluated in the same manner as in Example 1.
[比較例3、4]
表1に示すとおりに上塗り塗工液を変更した以外は、実施例3と同様に印刷用塗工紙を製造して評価した。 [Comparative Examples 3 and 4]
Coating paper for printing was produced and evaluated in the same manner as in Example 3, except that the top coating liquid was changed as shown in Table 1.
表1に示すとおりに上塗り塗工液を変更した以外は、実施例3と同様に印刷用塗工紙を製造して評価した。 [Comparative Examples 3 and 4]
Coating paper for printing was produced and evaluated in the same manner as in Example 3, except that the top coating liquid was changed as shown in Table 1.
<シリーズ2>
[実施例5~8]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有し、澱粉サイズプレスされた坪量75g/m2の原紙を準備した
表1に示す顔料、接着剤を用いて固形分濃度65重量%の顔料塗工液を得た。
これらを用いて、実施例1と同様にして1層の顔料塗工層を備える印刷用塗工紙を製造して評価した。 <Series 2>
[Examples 5 to 8]
100% by weight of chemical pulp, 13.5% by weight of light calcium carbonate as a filler, and starch size pressed base paper having a basis weight of 75 g / m 2 were prepared. A pigment coating liquid having a concentration of 65% by weight was obtained.
Using these, a coated paper for printing having one pigment coated layer was manufactured and evaluated in the same manner as in Example 1.
[実施例5~8]
化学パルプ100重量%を用い、填料として軽質炭酸カルシウムを13.5重量%含有し、澱粉サイズプレスされた坪量75g/m2の原紙を準備した
表1に示す顔料、接着剤を用いて固形分濃度65重量%の顔料塗工液を得た。
これらを用いて、実施例1と同様にして1層の顔料塗工層を備える印刷用塗工紙を製造して評価した。 <Series 2>
[Examples 5 to 8]
100% by weight of chemical pulp, 13.5% by weight of light calcium carbonate as a filler, and starch size pressed base paper having a basis weight of 75 g / m 2 were prepared. A pigment coating liquid having a concentration of 65% by weight was obtained.
Using these, a coated paper for printing having one pigment coated layer was manufactured and evaluated in the same manner as in Example 1.
[比較例5]
表1に示すとおりに塗工液を変更した以外は、実施例5と同様に印刷用塗工紙を製造して評価した。 [Comparative Example 5]
Except that the coating liquid was changed as shown in Table 1, a coated paper for printing was produced and evaluated in the same manner as in Example 5.
表1に示すとおりに塗工液を変更した以外は、実施例5と同様に印刷用塗工紙を製造して評価した。 [Comparative Example 5]
Except that the coating liquid was changed as shown in Table 1, a coated paper for printing was produced and evaluated in the same manner as in Example 5.
シリーズ1の実施例3、4では、D50が0.80μm以下の炭酸カルシウムを用いることでクレーが配合される比較例4よりも印刷表面強度が向上し、バインダーを減配できる可能性が示唆された。また、実施例3、4では平均粒子径が大きい炭酸カルシウムを使用した比較例3と同カレンダー条件においても高い光沢度が得られた。
In Examples 3 and 4 of the series 1, the use of calcium carbonate having a D50 of 0.80 μm or less improved the printing surface strength as compared with Comparative Example 4 in which the clay was blended, and suggested that the binder may be reduced. . In Examples 3 and 4, high glossiness was obtained under the same calender conditions as Comparative Example 3 using calcium carbonate having a large average particle diameter.
シリーズ2はシングル塗工を施した印刷用塗工紙に関する。D50が0.80μm以下の炭酸カルシウムを配合した実施例5~8では、シリーズ1(ダブル塗工)と同様に、平均粒子径が大きい炭酸カルシウムを使用した比較例5に比べて高い光沢度が得られた。また実施例8では、実施例5に比べてバインダーである澱粉を1重量部減配したが、印刷表面強度は印刷上問題無いレベルを保持し、両者に大差は見られなかった。
Series 2 relates to a single coated paper for printing. In Examples 5 to 8 in which calcium carbonate having a D50 of 0.80 μm or less was blended, the glossiness was higher than in Comparative Example 5 in which calcium carbonate having a large average particle diameter was used, as in Series 1 (double coating). Obtained. Further, in Example 8, although the starch serving as a binder was reduced by 1 part by weight as compared with Example 5, the printing surface strength was maintained at a level having no problem in printing, and there was no large difference between the two.
シリーズ3より、D50が0.80μm以下の炭酸カルシウムを使用することで、クレーまたはカオリンを使用した場合と比較して、同等の白紙光沢度でありながら、強度を向上でき、接着剤の量を減らしても同等強度の印刷用塗工紙を得ることができたことが明らかである。以上より、本発明の印刷用塗工紙は、白紙光沢度が高く、かつ強度に優れることが明らかである。
From series 3, by using calcium carbonate having a D50 of 0.80 μm or less, the strength can be improved while having the same white paper glossiness as compared with the case of using clay or kaolin, and the amount of adhesive can be reduced. It is apparent that even when the amount of reduction was reduced, a coated paper for printing having the same strength could be obtained. From the above, it is clear that the coated paper for printing of the present invention has a high degree of white paper gloss and excellent strength.
Claims (7)
- 原紙の少なくとも片面に顔料塗工層を備え、
最外顔料塗層が0.50μmより大きく0.80μm以下の平均粒子径(D50)を有する炭酸カルシウムを含み、
白紙光沢度(75°)が60%以上である、印刷用塗工紙。 Provided with a pigment coating layer on at least one side of the base paper,
An outermost pigment coating layer containing calcium carbonate having an average particle diameter (D50) of greater than 0.50 μm and 0.80 μm or less;
A coated paper for printing having a blank glossiness (75 °) of 60% or more. - 前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを40重量部以上含む、請求項1に記載の印刷用塗工紙。 The coated paper for printing according to claim 1, wherein the calcium carbonate is contained in an amount of 40 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
- 前記炭酸カルシウムの平均粒子径(D50)が0.55~0.75μmである、請求項1または2に記載の印刷用塗工紙。 The coated paper for printing according to claim 1, wherein the average particle diameter (D50) of the calcium carbonate is 0.55 to 0.75 μm.
- 藍紅印刷部の印刷光沢度が70%以上である請求項1~3のいずれかに記載の印刷用塗工紙。 (4) The coated printing paper according to any one of (1) to (3), wherein the printing gloss of the indigo red printing section is 70% or more.
- 前記最外顔料塗工層における顔料100重量部中に、前記炭酸カルシウムを75重量部以上含む、請求項2に記載の印刷用塗工紙。 The coated paper for printing according to claim 2, wherein the calcium carbonate is contained in an amount of 75 parts by weight or more in 100 parts by weight of the pigment in the outermost pigment coated layer.
- 複数の顔料塗工層を備え、かつ前記最外顔料塗工層の塗工量が最内顔料塗工層の塗工量より多い、請求項1~5のいずれかに記載の印刷用塗工紙。 The printing coating according to any one of claims 1 to 5, comprising a plurality of pigment coating layers, wherein the coating amount of the outermost pigment coating layer is larger than the coating amount of the innermost pigment coating layer. paper.
- 最外塗工層の塗工量が、7g/m2以上である請求項1~6のいずれかに記載の印刷用塗工紙。 The coated paper for printing according to any one of claims 1 to 6, wherein the coating amount of the outermost coating layer is 7 g / m 2 or more.
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JP2020525791A JPWO2019244970A1 (en) | 2018-06-22 | 2019-06-20 | Coated paper for printing |
JP2023197461A JP2024026131A (en) | 2018-06-22 | 2023-11-21 | coated paper for printing |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006342433A (en) * | 2004-07-02 | 2006-12-21 | Oji Paper Co Ltd | Coated paper for printing |
JP2012214959A (en) * | 2011-03-30 | 2012-11-08 | Nippon Paper Industries Co Ltd | Coated white paperboard and manufacturing method of the same |
JP2012224535A (en) * | 2011-04-08 | 2012-11-15 | Oji Holdings Corp | Light calcium carbonate-containing slurry for coating, and coated paper using the same |
JP2013129920A (en) * | 2011-12-20 | 2013-07-04 | Oji Holdings Corp | Method for producing coated paper for printing |
JP2016017015A (en) * | 2014-07-09 | 2016-02-01 | 奥多摩工業株式会社 | Calcium carbonate slurry, and coating liquid and coated product using the same |
JP2017524557A (en) * | 2014-05-26 | 2017-08-31 | オムヤ インターナショナル アーゲー | Calcium carbonate for rotary gravure printing media |
-
2019
- 2019-06-20 WO PCT/JP2019/024451 patent/WO2019244970A1/en active Application Filing
- 2019-06-20 JP JP2020525791A patent/JPWO2019244970A1/en active Pending
- 2019-06-21 TW TW108121714A patent/TW202010901A/en unknown
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Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006342433A (en) * | 2004-07-02 | 2006-12-21 | Oji Paper Co Ltd | Coated paper for printing |
JP2012214959A (en) * | 2011-03-30 | 2012-11-08 | Nippon Paper Industries Co Ltd | Coated white paperboard and manufacturing method of the same |
JP2012224535A (en) * | 2011-04-08 | 2012-11-15 | Oji Holdings Corp | Light calcium carbonate-containing slurry for coating, and coated paper using the same |
JP2013129920A (en) * | 2011-12-20 | 2013-07-04 | Oji Holdings Corp | Method for producing coated paper for printing |
JP2017524557A (en) * | 2014-05-26 | 2017-08-31 | オムヤ インターナショナル アーゲー | Calcium carbonate for rotary gravure printing media |
JP2016017015A (en) * | 2014-07-09 | 2016-02-01 | 奥多摩工業株式会社 | Calcium carbonate slurry, and coating liquid and coated product using the same |
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