WO2020171198A1 - Coated printing paper - Google Patents
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- WO2020171198A1 WO2020171198A1 PCT/JP2020/006996 JP2020006996W WO2020171198A1 WO 2020171198 A1 WO2020171198 A1 WO 2020171198A1 JP 2020006996 W JP2020006996 W JP 2020006996W WO 2020171198 A1 WO2020171198 A1 WO 2020171198A1
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- calcium carbonate
- printing
- paper
- weight
- coating layer
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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
Definitions
- the present invention relates to an A3 grade equivalent printing coated paper, and more particularly to an A3 grade equivalent printing coated paper having good printing surface feeling and printing surface strength.
- coated paper for printing is classified into A1 to A3 grades or the like according to the coating amount.
- coated paper for printing which is classified as A3 grade, has 100% bleached chemical pulp as the base paper and a coating amount of about 5 to 15 g/m 2 on one side. Therefore, it is used for applications such as catalogs, pamphlets, leaflets, posters, etc., which are required to have beauty.
- the coating amount is lower than that of the A2 grade printing coated paper having a larger coating amount, there is a problem that it is difficult to obtain a printing surface feeling of the A2 grade level.
- Japanese Patent Application Laid-Open No. 2004-242242 discloses that titanium dioxide is used as a pigment for improving the surface feeling of coated paper for printing.
- a printing coated paper having a pigment coating layer containing irregular-shaped fine calcium carbonate having a specific particle size solves the above problems. That is, the said subject is solved by the following this invention.
- a coated paper for printing which has good print surface feeling and print surface strength and is equivalent to A3 grade.
- Coated paper for printing is a paper for printing having a pigment coating layer provided on a base paper.
- the pigment coating layer is a layer containing a white pigment as a main component.
- the outermost pigment coating layer of the coated printing paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 ⁇ m or less.
- the coated paper for printing of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser system, inkjet system, electrophotographic system, etc.) on the surface of the paper. Further, examples of its use include, but are not limited to, books, magazines, posters, envelopes, calendars, and the like.
- Outermost Pigment Coating Layer 1 Pigment The outermost pigment coating layer of the present invention has an average particle diameter (D50) of 0.80 ⁇ m or less, and has an amorphous calcium carbonate (hereinafter, also referred to as “first calcium carbonate”). )including.
- Amorphous calcium carbonate is a calcium carbonate whose shape is not uniform, for example, heavy calcium carbonate produced by physically crushing and classifying limestone, and light calcium carbonate produced in the causticizing step of the pulp manufacturing process. (See, for example, causticized light calcium carbonate, see Japanese Patent No. 5274077).
- the outermost pigment coating layer on at least one side may include the first calcium carbonate.
- Calcium carbonate has excellent binding properties with an adhesive (binder) having an acidic group such as latex to be described later and improves whiteness, so that good printing surface strength, printing surface feeling and whiteness can be achieved.
- the average particle diameter (D50) is a volume 50% average particle diameter.
- the average particle diameter (D50) is measured by a laser diffraction method and can be measured by Mastersizer 3000 manufactured by Malvern.
- the upper limit of the average particle diameter (D50) of the first calcium carbonate is preferably 0.75 ⁇ m or less, and more preferably 0.70 ⁇ m or less.
- the lower limit of the average particle diameter (D50) is preferably 0.50 ⁇ m or more, and more preferably 0.55 ⁇ m or more.
- the coating layer becomes dense, so that glossiness is likely to be exhibited even when the coating amount is low, and high glossiness is achieved when calendered. it can. If the average particle diameter (D50) is less than 0.50 ⁇ m, the required amount of the adhesive (binder) increases, and the printing surface strength may decrease.
- the lower limit of the blending amount of the first calcium carbonate in the outermost pigment coating layer is preferably 10 parts by weight or more, and 20 parts by weight or more, in 100 parts by weight of the pigment in the outermost pigment coating layer. Is more preferable.
- the entire amount may be the first calcium carbonate, but when the first calcium carbonate having a small average particle diameter (D50) is used, the specific surface area of the pigment increases and the amount of adhesive (binder) required increases. Strength tends to be difficult to develop. On the other hand, when the content of the first calcium carbonate is increased, the expression of print gloss and the whiteness tend to be improved.
- the upper limit of the amount of the first calcium carbonate compounded is preferably 80 parts by weight or less, more preferably 50 parts by weight or less, further preferably 40 parts by weight or less, and most preferably 30 parts by weight or less.
- the first calcium carbonate is preferably ground calcium carbonate or the above-mentioned causticized light calcium carbonate.
- the "mixing amount of the first calcium carbonate" means the total amount thereof.
- the “blending amount of the first calcium carbonate” is 100. Parts by weight.
- the white pigment other than the first calcium carbonate a pigment usually used in the relevant field can be used.
- examples are 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 thereof include inorganic pigments such as white, organic pigments such as solid, hollow, and core-shell types. A plurality of these pigments may be used in combination, but the whiteness of the pigment may decrease, so that it is preferable that the content of yellow pigment such as kaolin or clay is low.
- the white pigment other than the first calcium carbonate it is preferable to use heavy calcium carbonate or light calcium carbonate having an average particle size (D50) of more than 0.80 ⁇ m (hereinafter, also referred to as “second calcium carbonate”).
- the shape of the second calcium carbonate is arbitrary, and may be amorphous or uniform.
- the total amount of the first and second calcium carbonate is preferably 90 parts by weight or more, and more preferably 100 parts by weight (total amount) in 100 parts by weight of the pigment in the outermost pigment coating layer.
- the second calcium carbonate is preferably ground calcium carbonate or causticized light calcium carbonate.
- the blending amount of the first calcium carbonate in this aspect is preferably as described above.
- the outermost pigment coating layer of the present invention contains an adhesive (binder) as a matrix.
- the adhesive is not limited, and known adhesives can be used. Examples thereof include styrene/butadiene type copolymers, styrene/acrylic type copolymers, ethylene/vinyl acetate type copolymers, butadiene/methyl methacrylate type copolymers, vinyl acetate/butyl acrylate type copolymers, anhydrous Latex of maleic acid copolymer, acrylic acid/methyl methacrylate copolymer, etc.; polyvinyl alcohol such as fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as proteins and synthetic proteins; etherified starch such as oxidized starch, positive starch, urea phosphate esterified starch, hydroxyethyl alcohol
- the blending amount of the adhesive in the outermost pigment coating layer is 5 to 30 parts by weight based on 100 parts by weight of the pigment in the outermost pigment coating layer from the viewpoints of printability and coating suitability. It is more preferably 8 to 25 parts by weight.
- the blending amount of the adhesive exceeds 30 parts by weight, the viscosity of the pigment coating solution becomes high and operating troubles are likely to occur during coating. Further, there is a tendency that the drying property of the ink is lowered during printing.
- the amount of the adhesive compounded is less than 5 parts by weight, it becomes difficult to obtain sufficient printing surface strength.
- the coated paper of the present invention preferably contains 10 to 80% by weight of latex in the total adhesive in the outermost pigment coating layer, and more preferably 15 to 70% by weight.
- Latex is an adhesive in the form of an emulsion.
- a styrene/butadiene copolymer latex is preferable.
- Calcium carbonate has a better affinity with adhesives having an acidic group such as latex as compared with kaolin or clay. Therefore, by using latex in the printing coated paper of the present invention, a printing coated paper having high printing surface strength, whiteness and printed surface feeling can be obtained.
- the outermost pigment coating layer of the present invention may be subjected to ordinary printing using a dispersant, a thickener, a water retention agent, a defoaming agent, a water resistance agent, a dye, a coloring pigment, etc., if necessary. It may contain various auxiliaries blended in the coated paper for use.
- a pigment coating layer other than the outermost pigment coating layer (hereinafter, referred to as “other pigment coating layer”).
- the amount of the first calcium carbonate compounded in the "layer” and the total amount of the first and second calcium carbonates are not limited, but are preferably in the above-mentioned range.
- the amount of the adhesive compounded in the other pigment coating layers and the contents of the latex and the starches are not limited, but the ranges described above are preferable. Further, the other pigment coating layers may contain the above-mentioned various auxiliaries.
- the total coating amount of the outermost pigment coating layer and other pigment coating layers is 5 to 5 solids per side. It is 15 g/m 2 , preferably 9 to 15 g/m 2 . If the total coating amount of the outermost pigment coating layer and other pigment coating layers is less than 5 g/m 2 , it is not possible to sufficiently cover the irregularities on the surface of the base paper, so that sufficient white paper glossiness can be obtained. May not be. Further, the acceptability of the printing ink may be significantly reduced, and the printing quality required for A3 grade paper may not be obtained.
- Base paper 1 Pulp As the base paper, known pulp can be used. Known pulps include chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemigrand pulp (CGP), semi-chemical pulp (SCP). , Waste paper pulp and the like.
- GP groundwood pulp
- RGP refiner groundwood pulp
- TMP thermomechanical pulp
- CGP chemothermomechanical pulp
- SCP semi-chemical pulp
- Waste paper pulp and the like.
- the present invention it is preferable to use chemical pulp.
- chemical pulp There are two types of chemical pulp, one produced by the kraft pulp method and the other produced by the sulfite pulp method. In the present invention, both of them can be used. It is preferable from the aspect. From the viewpoint of whiteness and the like, 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, particularly preferably 95% by weight or more, in the total pulp. 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, derami kaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water.
- Inorganic fillers such as aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, and amorphous silica produced by neutralization of sodium silicate with mineral acid, urea-formalin resin, melamine Examples include organic fillers such as system resins, polystyrene resins, and phenol resins.
- heavy calcium carbonate and light calcium carbonate which are typical fillers in neutral papermaking and alkaline papermaking, are preferably used in the present invention for improving opacity.
- Calcium carbonate used as a filler is optional, and may be the above-mentioned first calcium carbonate or second calcium carbonate, but light calcium carbonate is preferable.
- the filler ratio in the base paper is not particularly limited, but is preferably 1 to 40% by weight, and more preferably 10 to 35% by weight. Considering the strength of the base paper, etc., it is more preferably 10 to 20% by weight.
- base paper additives can be used for the base paper.
- a sulfuric acid band various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers and internal aids for papermaking such as internal sizing agents are added as necessary.
- the dry paper strength improver include polyacrylamide and cationized starch
- examples of the wet paper strength improver include polyamide epichlorohydrin, polyamine epichlorohydrin and polyamide polyamine epichlorohydrin. These chemicals are added within a range that does not affect formation and operability.
- Examples of the internally added sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent. Furthermore, dyes, pigments, optical brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be added as required.
- Basic weight of base paper The basic weight of the base paper of the printing coated paper of the present invention is preferably 20 to 200 g/m 2 , more preferably 20 to 150 g/m 2 , and more preferably 25 to 72 g/m 2. More preferably, it is 2 .
- the printing coated paper of the present invention may have a clear (transparent) coating layer on one side or both sides of the above-mentioned base paper.
- the clear coating layer is, for example, starch, oxidized starch, various modified materials, using a coater (coating machine) such as a 2-roll pond size press, a gate roll coater, a pre-metering size press, a curtain coater and a spray coater.
- a clear coating liquid (surface treatment liquid) whose main component is starch such as starch (self-modified, cation-modified, etc.), water-soluble polymer such as polyacrylamide, polyvinyl alcohol, etc.
- the obtained coating layer In the present invention, it is preferable to apply starch.
- the clear coating liquid may contain a sizing agent or the like.
- the coating amount of the clear coating layer is preferably 0.1 to 3.0 g/m 2 in solid content per one surface, more preferably 0.2 to 2.0 g/m 2 , and more preferably 0. It is more preferably 5 to 2.0 g/m 2 .
- the coated paper for printing of the present invention can be produced by a known method.
- (1) Manufacture of base paper The raw materials used for the base paper used in the present invention are as described above.
- the base paper is manufactured by a known papermaking method. For example, use a Fourdrinier paper machine including top wire, on-top former, gap former, round net paper machine, paperboard paper machine combining both fourdrinier paper machine and round net paper machine, Yankee dryer machine, etc. You can The pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline.
- the papermaking speed is also 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 layer coating liquid can be prepared by dispersing or dissolving the above-described pigment, adhesive, and other additives in water.
- the solid content concentration and viscosity of the coating liquid for the pigment coating layer may be appropriately adjusted according to the coating method described later.
- the solid content concentration of the blade coater is preferably 40 to 70% by weight, It is preferably 60 to 70% by weight, and the viscosity is preferably in the range of 500 to 5000 mPa ⁇ s as measured by B-type viscosity at room temperature and 60 rpm.
- the solid content concentration is preferably 30 to 60% by weight, more preferably 40 to 60% by weight.
- 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 also 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 one layer or two or more layers, but since the surface smoothness can be improved, the method for coating the outermost pigment coating layer is It is preferably a blade coater.
- the method for drying the wet pigment 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 manufactured coated paper for printing may be calendered.
- the coated paper for printing In order to obtain high glossiness, it is preferable to subject the coated paper for printing to calendering, but on the other hand, the pigment coating layer is compressed to increase the density and the scattering coefficient increases, resulting in a decrease in whiteness. There is a tendency to do. Therefore, as will be described later, the calendering condition needs to be appropriately selected according to the required quality.
- 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 calender roll, linear pressure, nip number, roll speed, paper moisture before calendering, etc.
- the calendering conditions are preferably a linear pressure of 140 to 300 kN/m, a temperature of 70 to 300° C., and a nip number of 5 or more.
- the calendering speed is about 200 to 800 m/min.
- the basis weight of the printing coated paper of the present invention is not particularly limited as long as it is the same as the basis weight of paper used in a normal printing machine.
- the basis weight of the coated paper for printing of the present invention is preferably 30 to 250 g/m 2 , and more preferably 50 to 220 g/m 2 from the viewpoint of transportability in a printing machine and paper rigidity.
- the white paper glossiness is an index showing the glossiness of a white paper, and in the present invention, it is a specular glossiness at an angle of 75° with respect to the normal line of the paper surface, measured according to JIS-P8142. ..
- the printing coated paper of the present invention is a printing coated paper having high white paper glossiness, since it can be suitably used for high-grade catalog and pamphlet applications.
- the coated paper for printing of the present invention has a white paper gloss of more than 40% and less than 60%.
- the outermost pigment coating layer of the printing coated paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 ⁇ m or less. , Has excellent print surface feeling and print surface strength. Even if the average particle diameter (D50) is in the above range, when calcium carbonate having a uniform shape (columnar calcium carbonate, etc.) is used, the printing surface feeling can be improved, but the specific surface area of the pigment is excessively high. Since the required amount of adhesive (binder) becomes excessive, the printing surface strength decreases.
- D50 average particle diameter
- the amorphous calcium carbonate whose specific surface area is not excessively high is used, the required amount of the adhesive (binder) is not excessive and the reduction of the printing surface strength can be suppressed, and the excellent printing surface feeling and excellent Both of the printed surface strength can be achieved.
- Parts by weight and% by weight are values in terms of solid content.
- Example 1 A base paper having a basis weight of 45 g/m 2 containing 100% by weight of chemical pulp and containing 13.5% by weight of light calcium carbonate as a filler was prepared.
- Both sides of the base paper are coated with a coating liquid for a pigment coating layer by a blade coater so that the solid content on one side is 10 g/m 2 , then dried by a conventional method, and calendered with a resin roll and a metal roll. Then, a coated paper for printing was obtained.
- the coated paper for printing was evaluated by the method described above.
- fine-grained heavy calcium carbonate which is the second calcium carbonate
- fine-grained heavy calcium carbonate that is the second calcium carbonate
- [Comparative Example 2] A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the calendering was not performed.
- Examples 5 to 7 A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the compounding ratio of the first calcium carbonate and the second calcium carbonate was changed as shown in Table 1.
- Comparative Example 5 A coated paper for printing was manufactured and evaluated in the same manner as in Comparative Example 4 except that the compounding amounts of the styrene/butadiene copolymer latex and the oxidized starch were changed as shown in Table 1.
- the printing coated paper of the present invention is excellent in printing surface feeling and printing surface strength.
- the printing coated papers of Examples 3, 5, 6, and 7 are extremely excellent in print surface feeling and print surface strength.
- the printed coated paper of Comparative Example does not have a sufficient print surface feeling and print surface strength.
- the printing coated paper of Comparative Example 4 which uses calcium carbonate having a uniform shape as the pigment of the outermost pigment coating layer, has a low printing surface strength because the required amount of the adhesive (binder) is large. In the coated printing paper of Comparative Example 5 in which the amount of the adhesive (binder) was increased to compensate for this, the printing surface strength was improved, but the printed surface feeling was reduced.
Abstract
Provided is a coated printing paper that has a white paper gloss (75°) of more than 40% but less than 60%. The coated printing paper comprises a base paper that has 5–15 g/m2 of a pigment coating layer on at least one side thereof. An outermost pigment coating layer includes amorphous calcium carbonate that has an average particle diameter (D50) of no more than 0.80 μm.
Description
本発明はＡ３グレード相当の印刷用塗工紙に関し、より詳しくは良好な印刷面感と印刷表面強度を備えるＡ３グレード相当の印刷用塗工紙に関する。
The present invention relates to an A3 grade equivalent printing coated paper, and more particularly to an A3 grade equivalent printing coated paper having good printing surface feeling and printing surface strength.
印刷用塗工紙は、塗工量に応じてＡ１～Ａ３グレード等に分類される。一般にＡ３グレードに分類される印刷用塗工紙は、原紙に晒化学パルプを１００％使用しかつ塗工量が片面で５～１５ｇ／ｍ２程度であることから、印刷面感が良好かつ軽量であり、美粧性を求められるカタログ、パンフレット、チラシ、ポスター等の用途に用いられる。しかし、より塗工量の多いＡ２グレードの印刷用塗工紙と比較して塗工量が低いことから、Ａ２グレードレベルの印刷面感を得ることが難しいという課題があった。印刷用塗工紙の面感を向上させることに関し、特許文献１は顔料として二酸化チタンを用いることが開示されている。
The coated paper for printing is classified into A1 to A3 grades or the like according to the coating amount. Generally, coated paper for printing, which is classified as A3 grade, has 100% bleached chemical pulp as the base paper and a coating amount of about 5 to 15 g/m 2 on one side. Therefore, it is used for applications such as catalogs, pamphlets, leaflets, posters, etc., which are required to have beauty. However, since the coating amount is lower than that of the A2 grade printing coated paper having a larger coating amount, there is a problem that it is difficult to obtain a printing surface feeling of the A2 grade level. Japanese Patent Application Laid-Open No. 2004-242242 discloses that titanium dioxide is used as a pigment for improving the surface feeling of coated paper for printing.
特許文献１で使用される二酸化チタンを用いずに、当該分野で通常使用される炭酸カルシウムを用いて良好な印刷面感を達成したいという要求がある。また、発明者らは予備的検討を行った結果、印刷面感を向上させようとすると印刷表面強度が低下する傾向にあることを見出した。かかる事情を鑑み、本発明は、良好な印刷面感と印刷表面強度を備えるＡ３グレード相当の印刷用塗工紙を提供することを課題とする。
There is a demand to achieve a good printed surface feeling by using calcium carbonate normally used in the relevant field, without using the titanium dioxide used in Patent Document 1. In addition, as a result of preliminary studies, the inventors have found that the print surface strength tends to decrease when trying to improve the print surface feeling. In view of such circumstances, it is an object of the present invention to provide an A3 grade-corresponding printing coated paper having a good printing surface feeling and printing surface strength.
発明者らは特定の粒子径を有する不定形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）白紙光沢度（７５°）が４０％超６０％未満の印刷用塗工紙であって、
原紙の少なくとも片面に片面塗工量５～１５ｇ／ｍ２の顔料塗工層を備え、
最外顔料塗工層が０．８０μｍ以下の平均粒子径（Ｄ５０）を有する不定形炭酸カルシウムを含む、印刷用塗工紙。
（２）前記不定形炭酸カルシウムの平均粒子径（Ｄ５０）が０．５０μｍ以上である、（１）に記載の印刷用塗工紙。
（３）前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを１０重量部以上含む、（１）または（２）に記載の印刷用塗工紙。
（４）前記不定形炭酸カルシウムの平均粒子径（Ｄ５０）が０．５５～０．７５μｍ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、前記不定形炭酸カルシウムを５０重量部以下含む、（１）～（４）のいずれかに記載の印刷用塗工紙。
（６）前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを３０重量部以下含む、（１）～（５）のいずれかに記載の印刷用塗工紙。 The inventors have found that a printing coated paper having a pigment coating layer containing irregular-shaped fine calcium carbonate having a specific particle size solves the above problems. That is, the said subject is solved by the following this invention.
(1) A coated paper for printing having a white paper glossiness (75°) of more than 40% and less than 60%,
At least one side of the base paper is provided with a pigment coating layer having a coating amount of 5 to 15 g/m 2 on one side,
A coated paper for printing, wherein the outermost pigment coating layer contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less.
(2) The printing coated paper according to (1), wherein the amorphous calcium carbonate has an average particle diameter (D50) of 0.50 μm or more.
(3) The coated printing paper according to (1) or (2), wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 10 parts by weight or more of the amorphous calcium carbonate.
(4) The coated paper for printing according to any of (1) to (3), wherein the amorphous calcium carbonate has an average particle diameter (D50) of 0.55 to 0.75 μm.
(5) The coated paper for printing according to any one of (1) to (4), wherein 50 parts by weight or less of the amorphous calcium carbonate is contained in 100 parts by weight of the pigment in the outermost pigment coating layer.
(6) The coated printing paper according to any one of (1) to (5), wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 30 parts by weight or less of the amorphous calcium carbonate.
（１）白紙光沢度（７５°）が４０％超６０％未満の印刷用塗工紙であって、
原紙の少なくとも片面に片面塗工量５～１５ｇ／ｍ２の顔料塗工層を備え、
最外顔料塗工層が０．８０μｍ以下の平均粒子径（Ｄ５０）を有する不定形炭酸カルシウムを含む、印刷用塗工紙。
（２）前記不定形炭酸カルシウムの平均粒子径（Ｄ５０）が０．５０μｍ以上である、（１）に記載の印刷用塗工紙。
（３）前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを１０重量部以上含む、（１）または（２）に記載の印刷用塗工紙。
（４）前記不定形炭酸カルシウムの平均粒子径（Ｄ５０）が０．５５～０．７５μｍ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、前記不定形炭酸カルシウムを５０重量部以下含む、（１）～（４）のいずれかに記載の印刷用塗工紙。
（６）前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを３０重量部以下含む、（１）～（５）のいずれかに記載の印刷用塗工紙。 The inventors have found that a printing coated paper having a pigment coating layer containing irregular-shaped fine calcium carbonate having a specific particle size solves the above problems. That is, the said subject is solved by the following this invention.
(1) A coated paper for printing having a white paper glossiness (75°) of more than 40% and less than 60%,
At least one side of the base paper is provided with a pigment coating layer having a coating amount of 5 to 15 g/m 2 on one side,
A coated paper for printing, wherein the outermost pigment coating layer contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less.
(2) The printing coated paper according to (1), wherein the amorphous calcium carbonate has an average particle diameter (D50) of 0.50 μm or more.
(3) The coated printing paper according to (1) or (2), wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 10 parts by weight or more of the amorphous calcium carbonate.
(4) The coated paper for printing according to any of (1) to (3), wherein the amorphous calcium carbonate has an average particle diameter (D50) of 0.55 to 0.75 μm.
(5) The coated paper for printing according to any one of (1) to (4), wherein 50 parts by weight or less of the amorphous calcium carbonate is contained in 100 parts by weight of the pigment in the outermost pigment coating layer.
(6) The coated printing paper according to any one of (1) to (5), wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 30 parts by weight or less of the amorphous calcium carbonate.
本発明により、良好な印刷面感と印刷表面強度を有するＡ３グレード相当の印刷用塗工紙を提供できる。
According to the present invention, it is possible to provide a coated paper for printing, which has good print surface feeling and print surface strength and is equivalent to A3 grade.
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。
The present invention will be described in detail below. In the present invention, “to” includes the endpoints thereof. That is, “X to Y” includes X and Y values.
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の最外顔料塗工層は、０．８０μｍ以下の平均粒子径（Ｄ５０）を有する不定形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、電子写真方式等）等の商業印刷を施すことができる。また、その用途としては書籍、雑誌、ポスター、封筒、カレンダー等が挙げられるが、これらに限定されない。 1. Coated paper for printing Coated paper for printing is a paper for printing having a pigment coating layer provided on a base paper. The pigment coating layer is a layer containing a white pigment as a main component. The outermost pigment coating layer of the coated printing paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less. The coated paper for printing of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser system, inkjet system, electrophotographic system, etc.) on the surface of the paper. Further, examples of its use include, but are not limited to, books, 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の最外顔料塗工層は、０．８０μｍ以下の平均粒子径（Ｄ５０）を有する不定形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、電子写真方式等）等の商業印刷を施すことができる。また、その用途としては書籍、雑誌、ポスター、封筒、カレンダー等が挙げられるが、これらに限定されない。 1. Coated paper for printing Coated paper for printing is a paper for printing having a pigment coating layer provided on a base paper. The pigment coating layer is a layer containing a white pigment as a main component. The outermost pigment coating layer of the coated printing paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less. The coated paper for printing of the present invention can be subjected to commercial printing such as offset printing, gravure printing, on-demand printing (laser system, inkjet system, electrophotographic system, etc.) on the surface of the paper. Further, examples of its use include, but are not limited to, books, magazines, posters, envelopes, calendars, and the like.
（１）最外顔料塗工層
１）顔料
本発明の最外顔料塗工層は平均粒子径（Ｄ５０）が０．８０μｍ以下の不定形炭酸カルシウム（以下、「第１の炭酸カルシウム」ともいう）を含む。不定形炭酸カルシウムとは形状が均一でない炭酸カルシウムであり、例えば、石灰石を物理的に粉砕、分級して製造される重質炭酸カルシウムや、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）等が挙げられる。 (1) Outermost Pigment Coating Layer 1) Pigment The outermost pigment coating layer of the present invention has an average particle diameter (D50) of 0.80 μm or less, and has an amorphous calcium carbonate (hereinafter, also referred to as “first calcium carbonate”). )including. Amorphous calcium carbonate is a calcium carbonate whose shape is not uniform, for example, heavy calcium carbonate produced by physically crushing and classifying limestone, and light calcium carbonate produced in the causticizing step of the pulp manufacturing process. (See, for example, causticized light calcium carbonate, see Japanese Patent No. 5274077).
１）顔料
本発明の最外顔料塗工層は平均粒子径（Ｄ５０）が０．８０μｍ以下の不定形炭酸カルシウム（以下、「第１の炭酸カルシウム」ともいう）を含む。不定形炭酸カルシウムとは形状が均一でない炭酸カルシウムであり、例えば、石灰石を物理的に粉砕、分級して製造される重質炭酸カルシウムや、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）等が挙げられる。 (1) Outermost Pigment Coating Layer 1) Pigment The outermost pigment coating layer of the present invention has an average particle diameter (D50) of 0.80 μm or less, and has an amorphous calcium carbonate (hereinafter, also referred to as “first calcium carbonate”). )including. Amorphous calcium carbonate is a calcium carbonate whose shape is not uniform, for example, heavy calcium carbonate produced by physically crushing and classifying limestone, and light calcium carbonate produced in the causticizing step of the pulp manufacturing process. (See, for example, causticized light calcium carbonate, see Japanese Patent No. 5274077).
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。炭酸カルシウムは後述するラテックス等の酸性基を有する接着剤（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、良好な印刷表面強度と印刷面感と白色度を達成できる。
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 include the first calcium carbonate. Calcium carbonate has excellent binding properties with an adhesive (binder) having an acidic group such as latex to be described later and improves whiteness, so that good printing surface strength, printing surface feeling and whiteness can be achieved.
本発明において、平均粒子径（Ｄ５０）は体積５０％平均粒子径である。本発明において平均粒子径（Ｄ５０）はレーザー回折法によって測定され、Ｍａｌｖｅｒｎ社製、マスターサイザー３０００等により測定できる。第１の炭酸カルシウムの平均粒子径（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前記平均粒子径（Ｄ５０）の下限は０．５０μｍ以上であることが好ましく、０．５５μｍ以上であることがより好ましい。平均粒子径（Ｄ５０）が０．８０μｍ以下であると塗工層が緻密になるため、塗工量が低くても光沢性が発現しやすく、さらにカレンダー処理をした場合には高い光沢度を達成できる。また、平均粒子径（Ｄ５０）が０．５０μｍ未満であると、接着剤（バインダー）要求量が多くなるため印刷表面強度が低下することがある。
In the present invention, the average particle diameter (D50) is a volume 50% average particle diameter. In the present invention, the average particle diameter (D50) is measured by a laser diffraction method and can be measured by Mastersizer 3000 manufactured by Malvern. The upper limit of the average particle diameter (D50) of the first 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 binder, the lower limit of the average particle diameter (D50) is preferably 0.50 μm or more, and more preferably 0.55 μm or more. When the average particle diameter (D50) is 0.80 μm or less, the coating layer becomes dense, so that glossiness is likely to be exhibited even when the coating amount is low, and high glossiness is achieved when calendered. it can. If the average particle diameter (D50) is less than 0.50 μm, the required amount of the adhesive (binder) increases, and the printing surface strength may decrease.
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、当該最外顔料塗工層中の顔料１００重量部中、１０重量部以上であることが好ましく、２０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が、平均粒子径（Ｄ５０）が小さい第１の炭酸カルシウムを使用すると顔料の比表面積が増加して接着剤（バインダー）要求量が多くなるため、印刷表面強度が発現しにくくなる傾向がある。一方で、第１の炭酸カルシウムの含有量を多くすると印刷光沢の発現性や白色度が向上する傾向がある。以上の観点から第１の炭酸カルシウムの配合量の上限は好ましくは８０重量部以下、より好ましくは５０重量部以下、さらに好ましくは４０重量部以下、最も好ましくは３０重量部以下である。第１の炭酸カルシウムは、重質炭酸カルシウムまたは前述の苛性化軽質炭酸カルシウムであることが好ましい。第１の炭酸カルシウムとして、Ｄ５０が異なる二種以上のものを用いる場合、前記「第１の炭酸カルシウムの配合量」はこれらの合計量を意味する。例えばＤ５０が０．８μｍである第１の炭酸カルシウムを７０重量部、Ｄ５０が０．５μｍである第１の炭酸カルシウムを３０重量部用いる場合、前記「第１の炭酸カルシウムの配合量」は１００重量部である。
The lower limit of the blending amount of the first calcium carbonate in the outermost pigment coating layer is preferably 10 parts by weight or more, and 20 parts by weight or more, in 100 parts by weight of the pigment in the outermost pigment coating layer. Is more preferable. The entire amount may be the first calcium carbonate, but when the first calcium carbonate having a small average particle diameter (D50) is used, the specific surface area of the pigment increases and the amount of adhesive (binder) required increases. Strength tends to be difficult to develop. On the other hand, when the content of the first calcium carbonate is increased, the expression of print gloss and the whiteness tend to be improved. From the above viewpoints, the upper limit of the amount of the first calcium carbonate compounded is preferably 80 parts by weight or less, more preferably 50 parts by weight or less, further preferably 40 parts by weight or less, and most preferably 30 parts by weight or less. The first calcium carbonate is preferably ground calcium carbonate or the above-mentioned causticized light calcium carbonate. When two or more kinds of D50 having different D50 are used as the first calcium carbonate, the "mixing amount of the first calcium carbonate" means the total amount thereof. For example, when 70 parts by weight of the first calcium carbonate having a D50 of 0.8 μm and 30 parts by weight of the first calcium carbonate having a D50 of 0.5 μm are used, the “blending amount of the first calcium carbonate” is 100. Parts by weight.
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、サチンホワイト等の無機顔料、密実型、中空型、コアーシェル型等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が、白色度が低下する恐れがあるため、カオリン、クレー等の黄色味のある顔料の含有量は少ないことが好ましい。
As the white pigment other than the first calcium carbonate, a pigment usually used in the relevant field can be used. Examples are 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 thereof include inorganic pigments such as white, organic pigments such as solid, hollow, and core-shell types. A plurality of these pigments may be used in combination, but the whiteness of the pigment may decrease, so that it is preferable that the content of yellow pigment such as kaolin or clay is low.
第１の炭酸カルシウム以外の白色顔料として、平均粒子径（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。第２の炭酸カルシウムの形状は任意であり、不定形または均一形状であってもよい。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（全量）がより好ましい。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。この態様における第１の炭酸カルシウムの配合量は、前述のとおりであることが好ましい。
As the white pigment other than the first calcium carbonate, it is preferable to use heavy calcium carbonate or light calcium carbonate having an average particle size (D50) of more than 0.80 μm (hereinafter, also referred to as “second calcium carbonate”). The shape of the second calcium carbonate is arbitrary, and may be amorphous or uniform. The total amount of the first and second calcium carbonate is preferably 90 parts by weight or more, and more preferably 100 parts by weight (total amount) in 100 parts by weight of the pigment in the outermost pigment coating layer. The second calcium carbonate is preferably ground calcium carbonate or causticized light calcium carbonate. The blending amount of the first calcium carbonate in this aspect is preferably as described above.
２）接着剤
本発明の最外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等のエーテル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等が挙げられる。これらは複数種を組合せて使用できる。 2) Adhesive The outermost pigment coating layer of the present invention contains an adhesive (binder) as a matrix. The adhesive is not limited, and known adhesives can be used. Examples thereof include styrene/butadiene type copolymers, styrene/acrylic type copolymers, ethylene/vinyl acetate type copolymers, butadiene/methyl methacrylate type copolymers, vinyl acetate/butyl acrylate type copolymers, anhydrous Latex of maleic acid copolymer, acrylic acid/methyl methacrylate copolymer, etc.; polyvinyl alcohol such as fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as proteins and synthetic proteins; etherified starch such as oxidized starch, positive starch, urea phosphate esterified starch, hydroxyethyl etherified starch, etc.; starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, etc. Etc. These can be used in combination of plural kinds.
本発明の最外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等のエーテル化澱粉、デキストリン等の澱粉類；カルボキシメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体等が挙げられる。これらは複数種を組合せて使用できる。 2) Adhesive The outermost pigment coating layer of the present invention contains an adhesive (binder) as a matrix. The adhesive is not limited, and known adhesives can be used. Examples thereof include styrene/butadiene type copolymers, styrene/acrylic type copolymers, ethylene/vinyl acetate type copolymers, butadiene/methyl methacrylate type copolymers, vinyl acetate/butyl acrylate type copolymers, anhydrous Latex of maleic acid copolymer, acrylic acid/methyl methacrylate copolymer, etc.; polyvinyl alcohol such as fully saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol; casein, soybean Proteins such as proteins and synthetic proteins; etherified starch such as oxidized starch, positive starch, urea phosphate esterified starch, hydroxyethyl etherified starch, etc.; starches such as dextrin; cellulose derivatives such as carboxymethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, etc. Etc. These can be used in combination of plural kinds.
最外顔料塗工層中の接着剤の配合量は、印刷適性、塗工適性の点から、当該最外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。接着剤の配合量が３０重量部を超える場合、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、印刷時にインキの乾燥性が低下する傾向が見られる。一方、接着剤の配合量が５重量部未満であると、十分な印刷表面強度を得にくくなる。
The blending amount of the adhesive in the outermost pigment coating layer is 5 to 30 parts by weight based on 100 parts by weight of the pigment in the outermost pigment coating layer from the viewpoints of printability and coating suitability. It is more preferably 8 to 25 parts by weight. When the blending amount of the adhesive exceeds 30 parts by weight, the viscosity of the pigment coating solution becomes high and operating troubles are likely to occur during coating. Further, there is a tendency that the drying property of the ink is lowered during printing. On the other hand, if the amount of the adhesive compounded is less than 5 parts by weight, it becomes difficult to obtain sufficient printing surface strength.
本発明の印刷用塗工紙は、最外顔料塗工層中の全接着剤中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・ブタジエン系共重合ラテックスが好ましい。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、高い印刷表面強度、白色度および印刷面感を有する印刷用塗工紙を得ることができる。また、他の接着剤として澱粉類を併用することが好ましい。
The coated paper of the present invention preferably contains 10 to 80% by weight of latex in the total adhesive in the outermost pigment coating layer, and more preferably 15 to 70% by weight. Latex is an adhesive in the form of an emulsion. As the latex, a styrene/butadiene copolymer latex is preferable. Calcium carbonate has a better affinity with adhesives having an acidic group such as latex as compared with kaolin or clay. Therefore, by using latex in the printing coated paper of the present invention, a printing coated paper having high printing surface strength, whiteness and printed surface feeling can be obtained. In addition, it is preferable to use starches in combination as another adhesive.
３）他の添加剤
本発明の最外顔料塗工層は、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、通常の印刷用塗工紙に配合される各種助剤を含んでいてもよい。 3) Other Additives The outermost pigment coating layer of the present invention may be subjected to ordinary printing using a dispersant, a thickener, a water retention agent, a defoaming agent, a water resistance agent, a dye, a coloring pigment, etc., if necessary. It may contain various auxiliaries blended in the coated paper for use.
本発明の最外顔料塗工層は、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、通常の印刷用塗工紙に配合される各種助剤を含んでいてもよい。 3) Other Additives The outermost pigment coating layer of the present invention may be subjected to ordinary printing using a dispersant, a thickener, a water retention agent, a defoaming agent, a water resistance agent, a dye, a coloring pigment, etc., if necessary. It may contain various auxiliaries blended in the coated paper for use.
（２）その他の顔料塗工層
本発明の印刷用塗工紙が２層以上の顔料塗工層を有する場合、最外顔料塗工層以外の顔料塗工層（以下、「その他の顔料塗工層」ともいう）中の第１の炭酸カルシウムの配合量、ならびに第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、前述した範囲であることが好ましい。また、その他の顔料塗工層中の接着剤の配合量、およびラテックスと澱粉類の含有率は限定されないが、前述した範囲であることが好ましい。また、その他の顔料塗工層は、前述した各種助剤を含んでいてもよい。 (2) Other pigment coating layer When the printing coated paper of the present invention has two or more pigment coating layers, a pigment coating layer other than the outermost pigment coating layer (hereinafter, referred to as "other pigment coating layer"). The amount of the first calcium carbonate compounded in the "layer" and the total amount of the first and second calcium carbonates are not limited, but are preferably in the above-mentioned range. The amount of the adhesive compounded in the other pigment coating layers and the contents of the latex and the starches are not limited, but the ranges described above are preferable. Further, the other pigment coating layers may contain the above-mentioned various auxiliaries.
本発明の印刷用塗工紙が２層以上の顔料塗工層を有する場合、最外顔料塗工層以外の顔料塗工層（以下、「その他の顔料塗工層」ともいう）中の第１の炭酸カルシウムの配合量、ならびに第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、前述した範囲であることが好ましい。また、その他の顔料塗工層中の接着剤の配合量、およびラテックスと澱粉類の含有率は限定されないが、前述した範囲であることが好ましい。また、その他の顔料塗工層は、前述した各種助剤を含んでいてもよい。 (2) Other pigment coating layer When the printing coated paper of the present invention has two or more pigment coating layers, a pigment coating layer other than the outermost pigment coating layer (hereinafter, referred to as "other pigment coating layer"). The amount of the first calcium carbonate compounded in the "layer" and the total amount of the first and second calcium carbonates are not limited, but are preferably in the above-mentioned range. The amount of the adhesive compounded in the other pigment coating layers and the contents of the latex and the starches are not limited, but the ranges described above are preferable. Further, the other pigment coating layers may contain the above-mentioned various auxiliaries.
（３）塗工量
本発明の印刷用塗工紙はＡ３グレード相当であるため、最外顔料塗工層およびその他の顔料塗工層を合計した塗工量は、片面あたり固形分で５～１５ｇ／ｍ２であり、９～１５ｇ／ｍ２であることが好ましい。最外顔料塗工層およびその他の顔料塗工層を合計した塗工量が５ｇ／ｍ２未満であると、原紙表面の凹凸を十分に覆うことができないため、十分な白紙光沢度が得られない場合がある。さらに、印刷インキの受理性が著しく低下し、Ａ３グレードの紙に求められる印刷品質が得られない恐れがある。 (3) Coating amount Since the printing coated paper of the present invention is equivalent to A3 grade, the total coating amount of the outermost pigment coating layer and other pigment coating layers is 5 to 5 solids per side. It is 15 g/m 2 , preferably 9 to 15 g/m 2 . If the total coating amount of the outermost pigment coating layer and other pigment coating layers is less than 5 g/m 2 , it is not possible to sufficiently cover the irregularities on the surface of the base paper, so that sufficient white paper glossiness can be obtained. May not be. Further, the acceptability of the printing ink may be significantly reduced, and the printing quality required for A3 grade paper may not be obtained.
本発明の印刷用塗工紙はＡ３グレード相当であるため、最外顔料塗工層およびその他の顔料塗工層を合計した塗工量は、片面あたり固形分で５～１５ｇ／ｍ２であり、９～１５ｇ／ｍ２であることが好ましい。最外顔料塗工層およびその他の顔料塗工層を合計した塗工量が５ｇ／ｍ２未満であると、原紙表面の凹凸を十分に覆うことができないため、十分な白紙光沢度が得られない場合がある。さらに、印刷インキの受理性が著しく低下し、Ａ３グレードの紙に求められる印刷品質が得られない恐れがある。 (3) Coating amount Since the printing coated paper of the present invention is equivalent to A3 grade, the total coating amount of the outermost pigment coating layer and other pigment coating layers is 5 to 5 solids per side. It is 15 g/m 2 , preferably 9 to 15 g/m 2 . If the total coating amount of the outermost pigment coating layer and other pigment coating layers is less than 5 g/m 2 , it is not possible to sufficiently cover the irregularities on the surface of the base paper, so that sufficient white paper glossiness can be obtained. May not be. Further, the acceptability of the printing ink may be significantly reduced, and the printing quality required for A3 grade paper may not be obtained.
（４）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）、古紙パルプ等が挙げられる。 (4) Base paper 1) Pulp As the base paper, known pulp can be used. Known pulps include chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemigrand pulp (CGP), semi-chemical pulp (SCP). , Waste paper pulp and the like.
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）、古紙パルプ等が挙げられる。 (4) Base paper 1) Pulp As the base paper, known pulp can be used. Known pulps include chemical pulp, groundwood pulp (GP), refiner groundwood pulp (RGP), thermomechanical pulp (TMP), chemothermomechanical pulp (CTMP), chemigrand pulp (CGP), semi-chemical pulp (SCP). , Waste paper pulp and the like.
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。
In the present invention, it is preferable to use chemical pulp. There are two types of chemical pulp, one produced by the kraft pulp method and the other produced by the sulfite pulp method. In the present invention, both of them can be used. It is preferable from the aspect. From the viewpoint of whiteness and the like, 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, particularly preferably 95% by weight or more, in the total pulp. 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、フェノール樹脂等の有機填料が挙げられる。 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, derami kaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water. Inorganic fillers such as aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, and amorphous silica produced by neutralization of sodium silicate with mineral acid, urea-formalin resin, melamine Examples include organic fillers such as system resins, polystyrene resins, and phenol resins.
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、フェノール樹脂等の有機填料が挙げられる。 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, derami kaolin, white carbon, talc, magnesium carbonate, barium carbonate, barium sulfate, water. Inorganic fillers such as aluminum oxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, zinc oxide, titanium oxide, and amorphous silica produced by neutralization of sodium silicate with mineral acid, urea-formalin resin, melamine Examples include organic fillers such as system resins, polystyrene resins, and phenol resins.
本発明においては、これらの中でも、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任意であり、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。原紙中の填料率は特に制限されないが、１～４０重量％であることが好ましく、１０～３５重量％であることがさらに好ましい。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。
Among these, heavy calcium carbonate and light calcium carbonate, which are typical fillers in neutral papermaking and alkaline papermaking, are preferably used in the present invention for improving opacity. Calcium carbonate used as a filler is optional, and may be the above-mentioned first calcium carbonate or second calcium carbonate, but light calcium carbonate is preferable. The filler ratio in the base paper is not particularly limited, but is preferably 1 to 40% by weight, and more preferably 10 to 35% by weight. Considering the strength of the base paper, etc., it is more preferably 10 to 20% by weight.
３）その他の添加剤
原紙には公知の製紙用添加剤も用いることができる。例えば、硫酸バンドや各種のアニオン性、カチオン性、ノニオン性あるいは、両性の歩留まり向上剤、濾水性向上剤、各種紙力増強剤や内添サイズ剤等の抄紙用内添助剤を必要に応じて使用することができる。乾燥紙力向上剤としてはポリアクリルアミド、カチオン化澱粉等が挙げられ、湿潤紙力向上剤としてはポリアミドエピクロロヒドリン、ポリアミンエピクロロヒドリン、ポリアミドポリアミンエピクロロヒドリン等が挙げられる。これらの薬品は地合や操業性等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、ロジンサイズ剤等が挙げられる。さらに、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 Additives Known base paper additives can be used for the base paper. For example, a sulfuric acid band, various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers and internal aids for papermaking such as internal sizing agents are added as necessary. Can be used. Examples of the dry paper strength improver include polyacrylamide and cationized starch, and examples of the wet paper strength improver include polyamide epichlorohydrin, polyamine epichlorohydrin and polyamide polyamine epichlorohydrin. These chemicals are added within a range that does not affect formation and operability. Examples of the internally added sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent. Furthermore, dyes, pigments, optical brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be added as required.
原紙には公知の製紙用添加剤も用いることができる。例えば、硫酸バンドや各種のアニオン性、カチオン性、ノニオン性あるいは、両性の歩留まり向上剤、濾水性向上剤、各種紙力増強剤や内添サイズ剤等の抄紙用内添助剤を必要に応じて使用することができる。乾燥紙力向上剤としてはポリアクリルアミド、カチオン化澱粉等が挙げられ、湿潤紙力向上剤としてはポリアミドエピクロロヒドリン、ポリアミンエピクロロヒドリン、ポリアミドポリアミンエピクロロヒドリン等が挙げられる。これらの薬品は地合や操業性等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、ロジンサイズ剤等が挙げられる。さらに、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 Additives Known base paper additives can be used for the base paper. For example, a sulfuric acid band, various anionic, cationic, nonionic or amphoteric retention improvers, drainage improvers, various paper strength enhancers and internal aids for papermaking such as internal sizing agents are added as necessary. Can be used. Examples of the dry paper strength improver include polyacrylamide and cationized starch, and examples of the wet paper strength improver include polyamide epichlorohydrin, polyamine epichlorohydrin and polyamide polyamine epichlorohydrin. These chemicals are added within a range that does not affect formation and operability. Examples of the internally added sizing agent include alkyl ketene dimer, alkenyl succinic anhydride, and rosin sizing agent. Furthermore, dyes, pigments, optical brighteners, pH adjusters, defoamers, pitch control agents, slime control agents and the like can be added as required.
４）原紙の坪量
本発明の印刷用塗工紙の原紙の坪量は２０～２００ｇ／ｍ２であることが好ましく、２０～１５０ｇ／ｍ２であることがより好ましく、２５～７２ｇ／ｍ２であることがさらに好ましい。 4) Basic weight of base paper The basic weight of the base paper of the printing coated paper of the present invention is preferably 20 to 200 g/m 2 , more preferably 20 to 150 g/m 2 , and more preferably 25 to 72 g/m 2. More preferably, it is 2 .
本発明の印刷用塗工紙の原紙の坪量は２０～２００ｇ／ｍ２であることが好ましく、２０～１５０ｇ／ｍ２であることがより好ましく、２５～７２ｇ／ｍ２であることがさらに好ましい。 4) Basic weight of base paper The basic weight of the base paper of the printing coated paper of the present invention is preferably 20 to 200 g/m 2 , more preferably 20 to 150 g/m 2 , and more preferably 25 to 72 g/m 2. More preferably, it is 2 .
５）クリア塗工層
本発明の印刷用塗工紙は、前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。クリア塗工層とは、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、スプレーコーター等のコータ（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）等の澱粉類、ポリアクリルアミド、ポリビニルアルコール等の水溶性高分子を主成分とするクリア塗工液（表面処理液）を、原紙上に塗工、乾燥して得られる塗工層をいう。本発明においては澱粉類を塗工することが好ましい。また、クリア塗工液にはサイズ剤等を含有させてもよい。 5) Clear coating layer The printing coated paper of the present invention may have a clear (transparent) coating layer on one side or both sides of the above-mentioned base paper. The clear coating layer is, for example, starch, oxidized starch, various modified materials, using a coater (coating machine) such as a 2-roll pond size press, a gate roll coater, a pre-metering size press, a curtain coater and a spray coater. A clear coating liquid (surface treatment liquid) whose main component is starch such as starch (self-modified, cation-modified, etc.), water-soluble polymer such as polyacrylamide, polyvinyl alcohol, etc. The obtained coating layer. In the present invention, it is preferable to apply starch. Further, the clear coating liquid may contain a sizing agent or the like.
本発明の印刷用塗工紙は、前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。クリア塗工層とは、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、スプレーコーター等のコータ（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）等の澱粉類、ポリアクリルアミド、ポリビニルアルコール等の水溶性高分子を主成分とするクリア塗工液（表面処理液）を、原紙上に塗工、乾燥して得られる塗工層をいう。本発明においては澱粉類を塗工することが好ましい。また、クリア塗工液にはサイズ剤等を含有させてもよい。 5) Clear coating layer The printing coated paper of the present invention may have a clear (transparent) coating layer on one side or both sides of the above-mentioned base paper. The clear coating layer is, for example, starch, oxidized starch, various modified materials, using a coater (coating machine) such as a 2-roll pond size press, a gate roll coater, a pre-metering size press, a curtain coater and a spray coater. A clear coating liquid (surface treatment liquid) whose main component is starch such as starch (self-modified, cation-modified, etc.), water-soluble polymer such as polyacrylamide, polyvinyl alcohol, etc. The obtained coating layer. In the present invention, it is preferable to apply starch. Further, the clear coating liquid may contain a sizing agent or the like.
原紙上にクリア塗工層を有すると、原紙の表面強度や平滑性が向上すると共に、顔料塗工層を設ける際の塗工適性が向上する。クリア塗工層の塗工量は、片面あたり固形分で０．１～３．０ｇ／ｍ２であることが好ましく、０．２～２．０ｇ／ｍ２であることがより好ましく、０．５～２．０ｇ／ｍ２であることがさらに好ましい。
When the clear coating layer is provided on the base paper, the surface strength and smoothness of the base paper are improved, and the coating suitability when the pigment coating layer is provided is improved. The coating amount of the clear coating layer is preferably 0.1 to 3.0 g/m 2 in solid content per one surface, more preferably 0.2 to 2.0 g/m 2 , and more preferably 0. It is more preferably 5 to 2.0 g/m 2 .
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。
（１）原紙の製造
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。 2. Production Method The coated paper for printing of the present invention can be produced by a known method.
(1) Manufacture of base paper The raw materials used for the base paper used in the present invention are as described above. The base paper is manufactured by a known papermaking method. For example, use a Fourdrinier paper machine including top wire, on-top former, gap former, round net paper machine, paperboard paper machine combining both fourdrinier paper machine and round net paper machine, Yankee dryer machine, etc. You can The pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline. The papermaking speed is also 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.
本発明の印刷用塗工紙は公知の方法で製造できる。
（１）原紙の製造
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。 2. Production Method The coated paper for printing of the present invention can be produced by a known method.
(1) Manufacture of base paper The raw materials used for the base paper used in the present invention are as described above. The base paper is manufactured by a known papermaking method. For example, use a Fourdrinier paper machine including top wire, on-top former, gap former, round net paper machine, paperboard paper machine combining both fourdrinier paper machine and round net paper machine, Yankee dryer machine, etc. You can The pH during papermaking may be acidic, neutral or alkaline, but is preferably neutral or alkaline. The papermaking speed is also 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）原紙のカレンダー処理
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カレンダー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。カレンダー処理条件としては、カレンダーロールの温度、線圧、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) Calendering of base paper It is preferable to calender the base paper with various calendering devices before coating the obtained base paper with the pigment coating liquid. 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 calender roll, the linear pressure, the nip number, the roll speed, the paper moisture before the calender, etc. are appropriately selected according to the required quality. By calendering the base paper, the smoothness of the base paper is improved, and the pigment coating suitability 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カレンダー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。カレンダー処理条件としては、カレンダーロールの温度、線圧、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) Calendering of base paper It is preferable to calender the base paper with various calendering devices before coating the obtained base paper with the pigment coating liquid. 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 calender roll, the linear pressure, the nip number, the roll speed, the paper moisture before the calender, etc. are appropriately selected according to the required quality. By calendering the base paper, the smoothness of the base paper is improved, and the pigment coating suitability is improved.
（３）顔料塗工層用塗工液の調製
顔料塗工層用塗工液は、前述した顔料、接着剤、他の添加剤を水に分散または溶解することで調製できる。顔料塗工層用塗工液の固形分濃度および粘度は、後述する塗工方法に合わせて適宜調整すればよいが、一例として、ブレードコーターでは固形分濃度は好ましくは４０～７０重量％、より好ましくは６０～７０重量％であり、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、ロールコーターでは固形分濃度は好ましくは３０～６０重量％、より好ましくは４０～６０重量％である。固形分濃度が低すぎるとブレードコーターではバックフロー等が発生しやすくなる。また、固形分濃度が高すぎるとブレードコーターではブレードの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等、操業性に影響が出やすくなる。 (3) Preparation of Pigment Coating Layer Coating Liquid The pigment coating layer coating liquid can be prepared by dispersing or dissolving the above-described pigment, adhesive, and other additives in water. The solid content concentration and viscosity of the coating liquid for the pigment coating layer may be appropriately adjusted according to the coating method described later. As an example, the solid content concentration of the blade coater is preferably 40 to 70% by weight, It is preferably 60 to 70% by weight, and the viscosity is preferably in the range of 500 to 5000 mPa·s as measured by B-type viscosity at room temperature and 60 rpm. Further, in the roll coater, the solid content concentration is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content concentration is too low, backflow and the like will easily occur in the blade coater. On the other hand, if the solid content concentration is too high, the blade coater has a large load on the blade and wear of the blade progresses, and the roll coater is likely to cause boiling.
顔料塗工層用塗工液は、前述した顔料、接着剤、他の添加剤を水に分散または溶解することで調製できる。顔料塗工層用塗工液の固形分濃度および粘度は、後述する塗工方法に合わせて適宜調整すればよいが、一例として、ブレードコーターでは固形分濃度は好ましくは４０～７０重量％、より好ましくは６０～７０重量％であり、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、ロールコーターでは固形分濃度は好ましくは３０～６０重量％、より好ましくは４０～６０重量％である。固形分濃度が低すぎるとブレードコーターではバックフロー等が発生しやすくなる。また、固形分濃度が高すぎるとブレードコーターではブレードの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等、操業性に影響が出やすくなる。 (3) Preparation of Pigment Coating Layer Coating Liquid The pigment coating layer coating liquid can be prepared by dispersing or dissolving the above-described pigment, adhesive, and other additives in water. The solid content concentration and viscosity of the coating liquid for the pigment coating layer may be appropriately adjusted according to the coating method described later. As an example, the solid content concentration of the blade coater is preferably 40 to 70% by weight, It is preferably 60 to 70% by weight, and the viscosity is preferably in the range of 500 to 5000 mPa·s as measured by B-type viscosity at room temperature and 60 rpm. Further, in the roll coater, the solid content concentration is preferably 30 to 60% by weight, more preferably 40 to 60% by weight. If the solid content concentration is too low, backflow and the like will easily occur in the blade coater. On the other hand, if the solid content concentration is too high, the blade coater has a large load on the blade and wear of the blade progresses, and the roll coater is likely to cause boiling.
（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、顔料塗工層は１層であってもよく２層以上であってもよいが、表面の平滑性を向上させることができるため、最外顔料塗工層の塗工方法はブレードコーターであることが好ましい。 (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 also 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 one layer or two or more layers, but since the surface smoothness can be improved, the method for coating the outermost pigment coating layer is It is preferably a blade coater.
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、顔料塗工層は１層であってもよく２層以上であってもよいが、表面の平滑性を向上させることができるため、最外顔料塗工層の塗工方法はブレードコーターであることが好ましい。 (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 also 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 one layer or two or more layers, but since the surface smoothness can be improved, the method for coating the outermost pigment coating layer is It is preferably a blade coater.
（５）その他の工程
湿潤状態の顔料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 pigment 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.
湿潤状態の顔料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 pigment 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.
前述のとおり、製造した印刷用塗工紙をカレンダー処理してもよい。高い光沢度を得るためには印刷用塗工紙にカレンダー処理を行うことが好ましいが、その一方で、顔料塗工層が圧縮されて密度が大きくなり、散乱係数が高くなるため白色度は低下する傾向が見られる。そのため、後述するとおり、カレンダー処理条件は要求される品質に応じて適宜選択される必要がある。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。カレンダー処理条件としては、カレンダーロールの温度、線圧、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。当該カレンダー処理条件は、線圧１４０～３００ｋＮ／ｍ、温度７０～３００℃で、ニップ数は５ニップ以上が好ましい。カレンダー処理速度は２００～８００ｍ／分程度である。
As mentioned above, the manufactured coated paper for printing may be calendered. In order to obtain high glossiness, it is preferable to subject the coated paper for printing to calendering, but on the other hand, the pigment coating layer is compressed to increase the density and the scattering coefficient increases, resulting in a decrease in whiteness. There is a tendency to do. Therefore, as will be described later, the calendering condition needs to be appropriately selected according to the required quality. When carrying out the calendar treatment, 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 calender roll, linear pressure, nip number, roll speed, paper moisture before calendering, etc. are appropriately selected according to the required quality, but in the printing coated paper of the present invention Is more preferably subjected to hot soft nip calender treatment. The calendering conditions are preferably a linear pressure of 140 to 300 kN/m, a temperature of 70 to 300° C., and a nip number of 5 or more. The calendering speed is about 200 to 800 m/min.
３．白紙物性
（１）坪量
印刷用塗工紙の印刷品質に対しては、坪量よりも顔料塗工層の塗工量の方が大きな影響を与える。よって、本発明の印刷用塗工紙の坪量は、通常の印刷機で使用される紙と同程度の坪量であればよく特に限定されない。しかしながら、印刷機における搬送性や紙の剛度の観点から、本発明の印刷用塗工紙の坪量は好ましくは３０～２５０ｇ／ｍ２であり、より好ましくは５０～２２０ｇ／ｍ２である。 3. White paper physical properties (1) Basis weight The coating amount of the pigment coating layer has a greater effect than the basis weight on the print quality of the printing coated paper. Therefore, the basis weight of the printing coated paper of the present invention is not particularly limited as long as it is the same as the basis weight of paper used in a normal printing machine. However, the basis weight of the coated paper for printing of the present invention is preferably 30 to 250 g/m 2 , and more preferably 50 to 220 g/m 2 from the viewpoint of transportability in a printing machine and paper rigidity.
（１）坪量
印刷用塗工紙の印刷品質に対しては、坪量よりも顔料塗工層の塗工量の方が大きな影響を与える。よって、本発明の印刷用塗工紙の坪量は、通常の印刷機で使用される紙と同程度の坪量であればよく特に限定されない。しかしながら、印刷機における搬送性や紙の剛度の観点から、本発明の印刷用塗工紙の坪量は好ましくは３０～２５０ｇ／ｍ２であり、より好ましくは５０～２２０ｇ／ｍ２である。 3. White paper physical properties (1) Basis weight The coating amount of the pigment coating layer has a greater effect than the basis weight on the print quality of the printing coated paper. Therefore, the basis weight of the printing coated paper of the present invention is not particularly limited as long as it is the same as the basis weight of paper used in a normal printing machine. However, the basis weight of the coated paper for printing of the present invention is preferably 30 to 250 g/m 2 , and more preferably 50 to 220 g/m 2 from the viewpoint of transportability in a printing machine and paper rigidity.
（２）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、高級感のあるカタログやパンフレット用途に好適に使用することができるため、白紙光沢度の高い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４０％超６０％未満である。 (2) White paper glossiness The white paper glossiness is an index showing the glossiness of a white paper, and in the present invention, it is a specular glossiness at an angle of 75° with respect to the normal line of the paper surface, measured according to JIS-P8142. .. The printing coated paper of the present invention is a printing coated paper having high white paper glossiness, since it can be suitably used for high-grade catalog and pamphlet applications. The coated paper for printing of the present invention has a white paper gloss of more than 40% and less than 60%.
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、高級感のあるカタログやパンフレット用途に好適に使用することができるため、白紙光沢度の高い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４０％超６０％未満である。 (2) White paper glossiness The white paper glossiness is an index showing the glossiness of a white paper, and in the present invention, it is a specular glossiness at an angle of 75° with respect to the normal line of the paper surface, measured according to JIS-P8142. .. The printing coated paper of the present invention is a printing coated paper having high white paper glossiness, since it can be suitably used for high-grade catalog and pamphlet applications. The coated paper for printing of the present invention has a white paper gloss of more than 40% and less than 60%.
（３）印刷面感および印刷表面強度
前述のとおり、本発明の印刷用塗工紙は最外顔料塗工層に平均粒子径（Ｄ５０）が０．８０μｍ以下である不定形炭酸カルシウムを含むため、優れた印刷面感および印刷表面強度を有する。平均粒子径（Ｄ５０）が前記範囲であっても、均一形状を有する炭酸カルシウム（柱状炭酸カルシウム等）を用いた場合、印刷面感は向上しうるが、一方で顔料の比表面積が過度に高くなり接着剤（バインダー）要求量が過多となるため、印刷表面強度が低下する。その点、本発明では、比表面積が過度に高くない不定形炭酸カルシウムを用いるため、接着剤（バインダー）要求量が過多とならず印刷表面強度の低下を抑制でき、優れた印刷面感と優れた印刷表面強度の双方を達成できる。 (3) Printing Surface Feeling and Printing Surface Strength As described above, the outermost pigment coating layer of the printing coated paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less. , Has excellent print surface feeling and print surface strength. Even if the average particle diameter (D50) is in the above range, when calcium carbonate having a uniform shape (columnar calcium carbonate, etc.) is used, the printing surface feeling can be improved, but the specific surface area of the pigment is excessively high. Since the required amount of adhesive (binder) becomes excessive, the printing surface strength decreases. In that respect, in the present invention, since the amorphous calcium carbonate whose specific surface area is not excessively high is used, the required amount of the adhesive (binder) is not excessive and the reduction of the printing surface strength can be suppressed, and the excellent printing surface feeling and excellent Both of the printed surface strength can be achieved.
前述のとおり、本発明の印刷用塗工紙は最外顔料塗工層に平均粒子径（Ｄ５０）が０．８０μｍ以下である不定形炭酸カルシウムを含むため、優れた印刷面感および印刷表面強度を有する。平均粒子径（Ｄ５０）が前記範囲であっても、均一形状を有する炭酸カルシウム（柱状炭酸カルシウム等）を用いた場合、印刷面感は向上しうるが、一方で顔料の比表面積が過度に高くなり接着剤（バインダー）要求量が過多となるため、印刷表面強度が低下する。その点、本発明では、比表面積が過度に高くない不定形炭酸カルシウムを用いるため、接着剤（バインダー）要求量が過多とならず印刷表面強度の低下を抑制でき、優れた印刷面感と優れた印刷表面強度の双方を達成できる。 (3) Printing Surface Feeling and Printing Surface Strength As described above, the outermost pigment coating layer of the printing coated paper of the present invention contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less. , Has excellent print surface feeling and print surface strength. Even if the average particle diameter (D50) is in the above range, when calcium carbonate having a uniform shape (columnar calcium carbonate, etc.) is used, the printing surface feeling can be improved, but the specific surface area of the pigment is excessively high. Since the required amount of adhesive (binder) becomes excessive, the printing surface strength decreases. In that respect, in the present invention, since the amorphous calcium carbonate whose specific surface area is not excessively high is used, the required amount of the adhesive (binder) is not excessive and the reduction of the printing surface strength can be suppressed, and the excellent printing surface feeling and excellent Both of the printed surface strength can be achieved.
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。
The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Parts by weight and% by weight are values in terms of solid content.
＜評価方法＞
（１）坪量
ＪＩＳ Ｐ ８１２４に基づいて測定した。
（２）紙厚および密度
ＪＩＳ Ｐ ８１１８：２０１４に基づいて測定した。
（３）ＩＳＯ白色度
ＪＩＳ Ｐ ８１４８に基づいて、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。
（４）白紙光沢度
ＪＩＳ Ｐ ８１４２に基づいて測定した。
（５）不透明度
ＪＩＳ Ｐ ８１４９：２０００に基づいて測定した。 <Evaluation method>
(1) Basis Weight Measured based on JIS P 8124.
(2) Paper thickness and density It was measured based on JIS P 8118:2014.
(3) ISO Whiteness Based on JIS P 8148, it was measured with a color difference meter CMS-35SPX manufactured by Murakami Color Co., Ltd. under conditions including ultraviolet light.
(4) White paper glossiness It was measured based on JIS P 8142.
(5) Opacity It was measured based on JIS P 8149:2000.
（１）坪量
ＪＩＳ Ｐ ８１２４に基づいて測定した。
（２）紙厚および密度
ＪＩＳ Ｐ ８１１８：２０１４に基づいて測定した。
（３）ＩＳＯ白色度
ＪＩＳ Ｐ ８１４８に基づいて、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。
（４）白紙光沢度
ＪＩＳ Ｐ ８１４２に基づいて測定した。
（５）不透明度
ＪＩＳ Ｐ ８１４９：２０００に基づいて測定した。 <Evaluation method>
(1) Basis Weight Measured based on JIS P 8124.
(2) Paper thickness and density It was measured based on JIS P 8118:2014.
(3) ISO Whiteness Based on JIS P 8148, it was measured with a color difference meter CMS-35SPX manufactured by Murakami Color Co., Ltd. under conditions including ultraviolet light.
(4) White paper glossiness It was measured based on JIS P 8142.
(5) Opacity It was measured based on JIS P 8149:2000.
（６）印刷面感
ローランド平判印刷機（４色）にて、印刷用インキ（東洋インキ製ＮＥＸ－ＮＶ Ｍ）を用いて墨→藍→紅→黄の順に印刷速度８０００枚／時で印刷し、得られた印刷物の２色（藍、紅）印刷部および藍単色ベタ印刷部およびハーフトーン（５０％）印刷部の印刷面感（着肉ムラ、光沢度ムラ等）を目視で評価した。評価基準は以下の通りとした。
Ａ＝非常に良好、Ｂ＝良好、Ｃ＝やや劣る、Ｄ＝劣る (6) Printing surface impression Printing at a printing speed of 8000 sheets/hour in the order of ink, indigo, red, and yellow using a printing ink (Toyo Ink NEX-NVM) on a Roland plain printing machine (4 colors). Then, the printed surface feeling (unevenness unevenness, uneven glossiness, etc.) of the two-color (indigo, red) printed part, the indigo monochromatic solid printed part and the halftone (50%) printed part of the obtained printed matter was visually evaluated. .. The evaluation criteria are as follows.
A=very good, B=good, C=somewhat inferior, D=inferior
ローランド平判印刷機（４色）にて、印刷用インキ（東洋インキ製ＮＥＸ－ＮＶ Ｍ）を用いて墨→藍→紅→黄の順に印刷速度８０００枚／時で印刷し、得られた印刷物の２色（藍、紅）印刷部および藍単色ベタ印刷部およびハーフトーン（５０％）印刷部の印刷面感（着肉ムラ、光沢度ムラ等）を目視で評価した。評価基準は以下の通りとした。
Ａ＝非常に良好、Ｂ＝良好、Ｃ＝やや劣る、Ｄ＝劣る (6) Printing surface impression Printing at a printing speed of 8000 sheets/hour in the order of ink, indigo, red, and yellow using a printing ink (Toyo Ink NEX-NVM) on a Roland plain printing machine (4 colors). Then, the printed surface feeling (unevenness unevenness, uneven glossiness, etc.) of the two-color (indigo, red) printed part, the indigo monochromatic solid printed part and the halftone (50%) printed part of the obtained printed matter was visually evaluated. .. The evaluation criteria are as follows.
A=very good, B=good, C=somewhat inferior, D=inferior
（７）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、ゴムロールについた印刷跡を紙に転写してピッキングの発生の程度を目視で評価した。評価基準は以下の通りとした。
Ａ＝まったく発生しない、Ｂ＝ほとんど発生しない、Ｃ＝やや発生するが使用には問題ない、Ｄ＝使用できないほど多い (7) Printing surface strength After printing with a printing ink (NEX-Y made by Toyo Ink) using an RI-I type printer (manufactured by Akira Seisakusho), the print marks on the rubber roll are transferred to paper and picked. The degree of occurrence of was visually evaluated. The evaluation criteria are as follows.
A=not occur at all, B=almost never occur, C=somewhat occur but no problem in use, D=too many to use
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、ゴムロールについた印刷跡を紙に転写してピッキングの発生の程度を目視で評価した。評価基準は以下の通りとした。
Ａ＝まったく発生しない、Ｂ＝ほとんど発生しない、Ｃ＝やや発生するが使用には問題ない、Ｄ＝使用できないほど多い (7) Printing surface strength After printing with a printing ink (NEX-Y made by Toyo Ink) using an RI-I type printer (manufactured by Akira Seisakusho), the print marks on the rubber roll are transferred to paper and picked. The degree of occurrence of was visually evaluated. The evaluation criteria are as follows.
A=not occur at all, B=almost never occur, C=somewhat occur but no problem in use, D=too many to use
［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４５ｇ／ｍ２の原紙を準備した。
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、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５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％の顔料塗工層用塗工液を得た。 [Example 1]
A base paper having a basis weight of 45 g/m 2 containing 100% by weight of chemical pulp and containing 13.5% by weight of light calcium carbonate as a filler was prepared.
As the pigment, 100 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm), which is the first calcium carbonate, was used, and a styrene-butadiene copolymer latex was used as an adhesive. 5 parts by weight and 6 parts by weight of oxidized starch were mixed, and water was further added to obtain a coating liquid for a pigment coating layer having a solid content concentration of 65% by weight.
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４５ｇ／ｍ２の原紙を準備した。
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、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５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％の顔料塗工層用塗工液を得た。 [Example 1]
A base paper having a basis weight of 45 g/m 2 containing 100% by weight of chemical pulp and containing 13.5% by weight of light calcium carbonate as a filler was prepared.
As the pigment, 100 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm), which is the first calcium carbonate, was used, and a styrene-butadiene copolymer latex was used as an adhesive. 5 parts by weight and 6 parts by weight of oxidized starch were mixed, and water was further added to obtain a coating liquid for a pigment coating layer having a solid content concentration of 65% by weight.
前記原紙上に、顔料塗工層用塗工液を片面あたり固形分で１０ｇ／ｍ２となるようにブレードコーターで両面塗工し、定法によって乾燥し、樹脂ロールと金属ロールにて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。
Both sides of the base paper are coated with a coating liquid for a pigment coating layer by a blade coater so that the solid content on one side is 10 g/m 2 , then dried by a conventional method, and calendered with a resin roll and a metal roll. Then, a coated paper for printing was obtained. The coated paper for printing was evaluated by the method described above.
［実施例２］
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、Ｄ５０＝０．５９μｍ）５０重量部および第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）５０重量部を用いた以外は、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。 [Example 2]
As the pigment, 50 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm) which is the first calcium carbonate, and fine-grained heavy calcium carbonate which is the second calcium carbonate (Phimatech Manufacturing, trade name: FMT97, D50=0.86 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 50 parts by weight was used.
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、Ｄ５０＝０．５９μｍ）５０重量部および第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）５０重量部を用いた以外は、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。 [Example 2]
As the pigment, 50 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm) which is the first calcium carbonate, and fine-grained heavy calcium carbonate which is the second calcium carbonate (Phimatech Manufacturing, trade name: FMT97, D50=0.86 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 50 parts by weight was used.
［実施例３］
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、Ｄ５０＝０．５９μｍ）２０重量部および第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）８０重量部を用いた以外は、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。 [Example 3]
As a pigment, 20 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm) that is the first calcium carbonate, and fine-grained heavy calcium carbonate that is the second calcium carbonate (Phimatech Production, trade name: FMT97, D50=0.86 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 80 parts by weight was used.
顔料として第１の炭酸カルシウムである超微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ１００ＹＦ、Ｄ５０＝０．５９μｍ）２０重量部および第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）８０重量部を用いた以外は、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。 [Example 3]
As a pigment, 20 parts by weight of ultrafine-grained heavy calcium carbonate (Pharmatech, trade name: FMT100YF, D50=0.59 μm) that is the first calcium carbonate, and fine-grained heavy calcium carbonate that is the second calcium carbonate (Phimatech Production, trade name: FMT97, D50=0.86 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 80 parts by weight was used.
［比較例１］
顔料として第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）５０重量部および一級カオリン（イメリスミネラルズ・ジャパン製、商品名：プレミア、Ｄ５０＝２．６７μｍ）５０重量部を用いた以外は、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。
［比較例２］
カレンダー処理を行わなかった以外は、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。
［比較例３］
片面あたり固形分で４．５ｇ／ｍ２となるようにブレードコーターで両面塗工した以外は、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。 [Comparative Example 1]
50 parts by weight of finely divided heavy calcium carbonate (Pharmatech, trade name: FMT97, D50=0.86 μm), which is the second calcium carbonate as a pigment, and primary kaolin (made by Imerys Minerals Japan, trade name: Premier, D50) =2.67 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 50 parts by weight was used.
[Comparative Example 2]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the calendering was not performed.
[Comparative Example 3]
A coated paper for printing was produced and evaluated in the same manner as in Example 1 except that both sides were coated with a blade coater so that the solid content on one side was 4.5 g/m 2 .
顔料として第２の炭酸カルシウムである微粒重質炭酸カルシウム（ファイマテック製、商品名：ＦＭＴ９７、Ｄ５０＝０．８６μｍ）５０重量部および一級カオリン（イメリスミネラルズ・ジャパン製、商品名：プレミア、Ｄ５０＝２．６７μｍ）５０重量部を用いた以外は、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。
［比較例２］
カレンダー処理を行わなかった以外は、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。
［比較例３］
片面あたり固形分で４．５ｇ／ｍ２となるようにブレードコーターで両面塗工した以外は、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。 [Comparative Example 1]
50 parts by weight of finely divided heavy calcium carbonate (Pharmatech, trade name: FMT97, D50=0.86 μm), which is the second calcium carbonate as a pigment, and primary kaolin (made by Imerys Minerals Japan, trade name: Premier, D50) =2.67 μm) Coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that 50 parts by weight was used.
[Comparative Example 2]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the calendering was not performed.
[Comparative Example 3]
A coated paper for printing was produced and evaluated in the same manner as in Example 1 except that both sides were coated with a blade coater so that the solid content on one side was 4.5 g/m 2 .
［実施例４］
第１の炭酸カルシウムとして超微粒苛性化軽質炭酸カルシウム（日本製紙株式会社製、Ｄ５０＝０．６４μｍ）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。 [Example 4]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that ultrafine causticized light calcium carbonate (manufactured by Nippon Paper Industries Co., Ltd., D50=0.64 μm) was used as the first calcium carbonate. ..
第１の炭酸カルシウムとして超微粒苛性化軽質炭酸カルシウム（日本製紙株式会社製、Ｄ５０＝０．６４μｍ）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。 [Example 4]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that ultrafine causticized light calcium carbonate (manufactured by Nippon Paper Industries Co., Ltd., D50=0.64 μm) was used as the first calcium carbonate. ..
［実施例５～７］
第１の炭酸カルシウムと第２の炭酸カルシウムの配合比を表１に示すように変更した以外は、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。 [Examples 5 to 7]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the compounding ratio of the first calcium carbonate and the second calcium carbonate was changed as shown in Table 1.
第１の炭酸カルシウムと第２の炭酸カルシウムの配合比を表１に示すように変更した以外は、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。 [Examples 5 to 7]
A coated paper for printing was manufactured and evaluated in the same manner as in Example 1 except that the compounding ratio of the first calcium carbonate and the second calcium carbonate was changed as shown in Table 1.
［比較例４］
超微粒苛性化軽質炭酸カルシウム（日本製紙株式会社製、Ｄ５０＝０．６４μｍ）の代わりに柱状の軽質炭酸カルシウム（奥多摩工業株式会社製、商品名：ＴＰ１２３ＣＳ）の粉砕品（Ｄ５０＝０．３７μｍ）を用いた以外は、実施例４と同様にして印刷用塗工紙を製造して評価した。 [Comparative Example 4]
Instead of ultrafine causticized light calcium carbonate (manufactured by Nippon Paper Industries Co., Ltd., D50=0.64 μm), columnar light calcium carbonate (manufactured by Okutama Industry Co., Ltd., trade name: TP123CS) is crushed (D50=0.37 μm) A coated paper for printing was manufactured and evaluated in the same manner as in Example 4 except that was used.
超微粒苛性化軽質炭酸カルシウム（日本製紙株式会社製、Ｄ５０＝０．６４μｍ）の代わりに柱状の軽質炭酸カルシウム（奥多摩工業株式会社製、商品名：ＴＰ１２３ＣＳ）の粉砕品（Ｄ５０＝０．３７μｍ）を用いた以外は、実施例４と同様にして印刷用塗工紙を製造して評価した。 [Comparative Example 4]
Instead of ultrafine causticized light calcium carbonate (manufactured by Nippon Paper Industries Co., Ltd., D50=0.64 μm), columnar light calcium carbonate (manufactured by Okutama Industry Co., Ltd., trade name: TP123CS) is crushed (D50=0.37 μm) A coated paper for printing was manufactured and evaluated in the same manner as in Example 4 except that was used.
［比較例５］
スチレン・ブタジエン系共重合ラテックスおよび酸化澱粉の配合量を表１に示すように変更した以外は、比較例４と同様にして印刷用塗工紙を製造して評価した。 [Comparative Example 5]
A coated paper for printing was manufactured and evaluated in the same manner as in Comparative Example 4 except that the compounding amounts of the styrene/butadiene copolymer latex and the oxidized starch were changed as shown in Table 1.
スチレン・ブタジエン系共重合ラテックスおよび酸化澱粉の配合量を表１に示すように変更した以外は、比較例４と同様にして印刷用塗工紙を製造して評価した。 [Comparative Example 5]
A coated paper for printing was manufactured and evaluated in the same manner as in Comparative Example 4 except that the compounding amounts of the styrene/butadiene copolymer latex and the oxidized starch were changed as shown in Table 1.
本発明の印刷用塗工紙は印刷面感および印刷表面強度に優れることが明らかである。特に実施例３、５、６、７の印刷用塗工紙は印刷面感および印刷表面強度に極めて優れることが明らかである。一方、比較例の印刷用塗工紙は印刷面感および印刷表面強度が十分なレベルではない。特に、形状が均一の炭酸カルシウムを最外顔料塗工層の顔料として用いた比較例４の印刷用塗工紙は、接着剤（バインダー）要求量が多くなるため印刷表面強度が低い。このことを補うべく接着剤（バインダー）量を増やした比較例５の印刷用塗工紙では、印刷表面強度は向上したが、印刷面感が低下した。
It is clear that the printing coated paper of the present invention is excellent in printing surface feeling and printing surface strength. In particular, it is clear that the printing coated papers of Examples 3, 5, 6, and 7 are extremely excellent in print surface feeling and print surface strength. On the other hand, the printed coated paper of Comparative Example does not have a sufficient print surface feeling and print surface strength. In particular, the printing coated paper of Comparative Example 4, which uses calcium carbonate having a uniform shape as the pigment of the outermost pigment coating layer, has a low printing surface strength because the required amount of the adhesive (binder) is large. In the coated printing paper of Comparative Example 5 in which the amount of the adhesive (binder) was increased to compensate for this, the printing surface strength was improved, but the printed surface feeling was reduced.
Claims (6)
- 白紙光沢度（７５°）が４０％超６０％未満の印刷用塗工紙であって、
原紙の少なくとも片面に片面塗工量５～１５ｇ／ｍ２の顔料塗工層を備え、
最外顔料塗工層が０．８０μｍ以下の平均粒子径（Ｄ５０）を有する不定形炭酸カルシウムを含む、印刷用塗工紙。 A coated paper for printing having a white paper gloss (75°) of more than 40% and less than 60%,
At least one side of the base paper is provided with a pigment coating layer having a coating amount of 5 to 15 g/m 2 on one side,
A coated paper for printing, wherein the outermost pigment coating layer contains amorphous calcium carbonate having an average particle diameter (D50) of 0.80 μm or less. - 前記不定形炭酸カルシウムの平均粒子径（Ｄ５０）が０．５０μｍ以上である、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 average particle size (D50) of the amorphous calcium carbonate is 0.50 μm or more.
- 前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを１０重量部以上含む、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 or 2, wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 10 parts by weight or more of the amorphous calcium carbonate.
- 前記不定形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１～３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 3, wherein the amorphous calcium carbonate has an average particle diameter (D50) of 0.55 to 0.75 µm.
- 前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを５０重量部以下含む、請求項１～４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 4, wherein 50 parts by weight or less of the amorphous calcium carbonate is contained in 100 parts by weight of the pigment in the outermost pigment coating layer.
- 前記最外顔料塗工層における顔料１００重量部中に、前記不定形炭酸カルシウムを３０重量部以下含む、請求項１～５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 5, wherein 100 parts by weight of the pigment in the outermost pigment coating layer contains 30 parts by weight or less of the amorphous calcium carbonate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021502173A JPWO2020171198A1 (en) | 2019-02-22 | 2020-02-21 | Coated paper for printing |
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| JP2019030480 | 2019-02-22 | ||
| JP2019-030480 | 2019-02-22 |
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| WO2020171198A1 true WO2020171198A1 (en) | 2020-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2020/006996 WO2020171198A1 (en) | 2019-02-22 | 2020-02-21 | Coated printing paper |
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| JP (1) | JPWO2020171198A1 (en) |
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| WO (1) | WO2020171198A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006070374A (en) * | 2004-08-31 | 2006-03-16 | Nippon Paper Industries Co Ltd | Coated paper for printing |
| JP2006249607A (en) * | 2005-03-10 | 2006-09-21 | Oji Paper Co Ltd | Dull coated paper for printing use |
| JP2008025045A (en) * | 2006-06-23 | 2008-02-07 | Oji Paper Co Ltd | Coated paper for printing and method for producing the same |
| JP2008106406A (en) * | 2006-10-27 | 2008-05-08 | Oji Paper Co Ltd | Matte coated paper for printing |
| JP2009234894A (en) * | 2008-03-28 | 2009-10-15 | Nippon Paper Industries Co Ltd | Method for producing engineered calcium carbonate and coating material for paper making using the same |
| WO2017039015A1 (en) * | 2015-09-03 | 2017-03-09 | 日本製紙株式会社 | Coated paper, coated base material, and method of evaluating property of ink drying |
-
2020
- 2020-02-21 WO PCT/JP2020/006996 patent/WO2020171198A1/en active Application Filing
- 2020-02-21 TW TW109105698A patent/TW202104723A/en unknown
- 2020-02-21 JP JP2021502173A patent/JPWO2020171198A1/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006070374A (en) * | 2004-08-31 | 2006-03-16 | Nippon Paper Industries Co Ltd | Coated paper for printing |
| JP2006249607A (en) * | 2005-03-10 | 2006-09-21 | Oji Paper Co Ltd | Dull coated paper for printing use |
| JP2008025045A (en) * | 2006-06-23 | 2008-02-07 | Oji Paper Co Ltd | Coated paper for printing and method for producing the same |
| JP2008106406A (en) * | 2006-10-27 | 2008-05-08 | Oji Paper Co Ltd | Matte coated paper for printing |
| JP2009234894A (en) * | 2008-03-28 | 2009-10-15 | Nippon Paper Industries Co Ltd | Method for producing engineered calcium carbonate and coating material for paper making using the same |
| WO2017039015A1 (en) * | 2015-09-03 | 2017-03-09 | 日本製紙株式会社 | Coated paper, coated base material, and method of evaluating property of ink drying |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020171198A1 (en) | 2021-12-23 |
| TW202104723A (en) | 2021-02-01 |
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