JP2013249550A - Coated fancy paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a matte-toned coated fancy paper for printing having a feeling of uncoated paper, hardly causing a scratch and a rubbing stain, having good ink drying properties and good printing quality.SOLUTION: The matte-toned coated fancy paper has a pigment coating layer, which is formed by a coating apparatus based on a non-contact measuring system and comprises a pigment and a binder as main components, on at least one side of base paper. The pigment coating layer contains 5 pts.mass or more and less than 40 pts.mass of talc having an average particle diameter of 2.0 to 4.0 μm on the basis of 100 pts.mass total pigment, contains 30 pts.mass or more of precipitated calcium carbonate and/or ground calcium carbonate, and has a coated amount after drying is 3 to 15 g/mper one side. The coated fancy paper has a white paper glossiness of the coated surface of 3 or more and less than 20 measured according to ISO 8254-1 (1999) at an incidence and light receiving angle of 75 degree.

Description

  The present invention relates to a matte-coated coated fancy paper having a texture of non-coated paper, and more particularly to a coated fancy paper having good print quality.

  In recent years, there has been an increasing demand for quality required for printed materials, and it is required that printing paper has good quality and expressability during printing as well as good post-processing suitability after printing. .

  Printing paper consists of non-coated printing paper (hereinafter referred to as non-coated paper) that is not coated with pigment on the base paper mainly composed of cellulose fibers, and a pigment-coated layer mainly composed of pigment and adhesive. Can be classified into coated printing paper (hereinafter referred to as coated paper).

  Non-coated paper can recognize the cellulose fiber that is the main component of the base paper on its surface, has a low gloss and a matte surface, and is rich in surface irregularities. One of the features is that it has a unique texture.

  However, non-coated paper has problems such as poor printability and poor ink drying due to the effects of surface irregularities and low surface ink acceptability. .

  On the other hand, coated paper is characterized by high surface smoothness compared to non-coated paper due to the presence of a pigment coating layer mainly composed of a pigment and an adhesive coated on the surface of the base paper. In particular, glossy coated paper with high white paper gloss, which is the gloss of the paper surface after the pigment coating layer has been applied, has very high surface smoothness, so it has good expressibility during printing. It is. In addition, since the pores formed between the pigment particles in the pigment coating layer have a smaller pore diameter than the base paper pores formed between the cellulose fibers, the separation effect of the vehicle component in the ink is high. Coated paper is characterized by having better ink drying properties than non-coated paper.

  However, the coated paper covers the unevenness of the base paper surface and provides a pigment coating layer, so it has a different appearance from the non-coated paper, and the smoothness is different, so the touch is also different from the non-coated paper. Yes.

  In the high-grade printing field, there are cases where special demands are also made on printing paper in order to differentiate and enhance the quality of printed matter. Among them, there is a so-called fancy paper, which is a highly decorative printing paper with a color, pattern, pattern, etc., or a mixture of hair dye fibers in the base paper, and has a pigment coating layer There is also a coated fancy paper.

Coated fancy paper is sometimes classified into glossy, which has a relatively high printing gloss, which is the gloss of the printed part when it is printed, and matte, which has a low printing gloss, both of which are uncoated paper It is finished to have a texture of non-coated paper, imitating the surface unevenness and feel of the material, and the low gloss appearance. The coated fancy paper is characterized in that the printing quality is better than the non-coated paper because it has a pigment coating layer on the base paper. In other words, it is a paper that has the texture of non-coated paper and at the same time has the print quality of the coated paper.
As described above, coated fancy paper has both the good aspects of non-coated paper and coated paper, but there have been some drawbacks when printing on conventional coated fancy paper. .

  The coated fancy paper is finished to have a low gloss in order to maintain the uncoated paper texture. For this reason, it does not pass through the smoothing process in the calendering process after the coating / drying of the pigment coating layer, which is applied to the general printing coated paper, or only a slight smoothing is performed. Therefore, when the pigment coating layer is rubbed due to contact between papers or contact with the machine part in the printing / binding process, a change in the orientation of the pigment on the convex part in the rubbed part is induced. There is a problem that smoothing is promoted, the gloss of the white paper is locally increased, and a difference in gloss from the non-rubbed portion becomes obvious, so that a so-called scratch is generated.

  In addition, since the surface of the pigment coating layer of the coated fancy paper product is not subjected to a smoothing process or only a light smoothing process, minute unevenness at the size level of the pigment used remains. doing. Further, when a base paper having a large unevenness is used as the base paper, the surface of the pigment coating layer has unevenness even at a level corresponding to the unevenness of the base paper. The uneven portion of the pigment coated surface due to these minute unevenness and the unevenness of the base paper does not inhibit the ink transfer to the coated surface smoothed by the printing pressure when printing, and has a good reproducibility range. It has been adjusted.

  However, when the non-printing part comes into contact with the surface of the printing part after completion of printing on the paper due to the unevenness of the surface of the pigment coating layer, the ink is transferred to the non-printing part and the paper is smeared. So-called cosmetic stains sometimes became a problem.

  Several methods have been proposed for pigment-coated paper having a non-coated paper texture. For example, a coated printing paper in which a coating layer containing a specific amount of organic filler is formed on a substrate having a specific smoothness, and the surface roughness of the coated surface is adjusted to a specific range (see Patent Document 1), Matte coated paper for printing, which is provided with a coating layer containing a binder and a matting agent (see Patent Document 2), a printing coating in which a coating layer mainly composed of a pigment and an adhesive is provided on a base paper In the paper, a method in which the outermost layer is provided as a specific coating amount, and then the outermost layer is subjected to uneven processing so as to have specific unevenness (see Patent Document 3), kaolin and an organic synthetic pigment are contained on the base paper. Furthermore, high-grade printing paper (Patent Document 4) provided with a coating layer containing a specific amount of a styrene-butadiene copolymer latex and a specific starch as a binder, and a pigment such as kaolin having a specific average particle size or more in the pigment coating layer More than a specific amount, and light on the pigment coating layer surface Matte coated paper (Patent Document 5) with adjusted surface properties such as degree, smoothness, surface roughness, static friction coefficient, etc., and printing coated paper provided with at least two pigment coating layers on the base paper. In addition, after providing an undercoat layer containing specific particles, a coated paper for printing (Patent Document 6) provided with an overcoat layer whose pigment is composed of only specific particles, a specific polyethylene wax or the like is specified for the coating layer An amount-containing pigment-coated paper (Patent Document 7) has been proposed.

  However, it is not in a state that can sufficiently meet the demand for high-quality coated fancy paper having matte-like coated fancy paper having a non-coated paper texture and extremely good print quality.

JP-A-7-166492 JP 2012-52255 A JP 2011-184820 A JP-A-8-144193 JP-A-9-31892 JP 2011-47082 A Japanese Patent Laid-Open No. 10-280295

  The present invention is a matte-coated coated fancy paper having a non-coated paper texture, which is less likely to cause scratches and stains, has good ink drying properties, and has a very good printing quality. Is intended to provide.

The present invention includes the following inventions of coated fancy paper.
(1) Matte-coated fancy paper having a pigment coating layer mainly composed of a pigment and an adhesive formed on a non-contact metering type coating device on at least one side of a base paper, the pigment coating The work layer contains 5 parts by mass or more and less than 40 parts by mass of talc having an average particle size of 2.0 to 4.0 μm in 100 parts by mass of all pigments, and 30 light calcium carbonates and / or heavy calcium carbonates. Incidence / reception angle 75, which is a pigment coating layer containing 3 parts by mass or more and having a coating amount after drying of 3 to 15 g / m ² per surface and measured according to ISO 8254-1 (1999) of the coated surface. Coated fancy paper, characterized in that the glossiness of the white paper is 3 or more and less than 20.

(2) The pigment coating layer further includes a delaminated kaolin having an average particle size of 0.4 to 1.0 μm in an amount of 30 parts by mass or less in 100 parts by mass of the total pigment. The coated fancy paper according to item (1).

(3) Heavy calcium carbonate in the pigment coating layer has an average particle diameter of 0.5 to 1.0 μm and a ratio of particles having a particle diameter of 0.2 μm or less is less than 15% by mass. Coated fancy paper according to item (1) or (2), which is a quality calcium carbonate.
(4) In any one of the items (1) to (3), the pigment coating layer is a pigment coating layer containing 10 to 30 parts of cubic light calcium carbonate in 100 parts by mass of all pigments. Coated fancy paper as described.
(5) The coating apparatus according to the non-contact metering type is a coating apparatus selected from an air knife coater, a curtain coater, a slot die coater, and a spray coater. Coated fancy paper as described (6) The surface of the base paper on which the coating layer is formed and the coating surface after the pigment coating layer is provided are surfaces that are not subjected to calendar treatment (1) to ( 5. The coated fancy paper according to any one of items 5).

  The coated fancy paper of the present invention is a mat-like coated paper having a texture of non-coated paper, which is less likely to cause scratches and stains on the coated surface, and has excellent printing quality such as excellent ink drying properties. It is a coated fancy paper with good quality.

The present invention is described in detail below.
The coated fancy paper of the present invention is used for differentiating and improving the quality of printed matter in the high-grade printing field. Color, pattern, pattern, etc. are added to the paper, and hair dye fibers are mixed in the base paper. This is a highly decorative printing paper that is generally fancy paper (fancy paper) or fine paper. Among the printing papers that are non-coated paper, the surface unevenness and touch and low gloss This is a coated fancy paper having a pigment coating layer that is finished so as to have an uncoated paper texture to simulate the appearance.

  As the cellulose fiber that is the main material of the base paper used in the matte coated fancy paper having the texture of the non-coated paper of the present invention, typically, pulp made from wood is used. Non-wood pulp such as bagasse, bamboo and cotton can also be used. The raw material for wood pulp may be either hardwood or softwood. As a method for obtaining pulp from raw materials, known cooking methods such as kraft cooking, polysulfide cooking, soda cooking, alkali sulfite cooking, etc. can be used.

The unbleached pulp obtained by cooking is preferably delignified by a known alkaline oxygen bleaching method after washing, rough selection and selection steps. As the alkaline oxygen bleaching method that can be used in the present invention, a known medium concentration method or high concentration method can be applied as it is, but a medium concentration method that is currently used at a pulp concentration of 8 to 15% is preferred. . In the present invention, in the alkaline oxygen bleaching step, it is a preferred embodiment that the alkali oxygen bleaching is continuously performed a plurality of times and delignification proceeds as much as possible.
The pulp that has been subjected to alkaline oxygen bleaching is then sent to a washing step. After washing, the pulp is sent to a multistage bleaching process.

  In the multi-stage bleaching step for obtaining the bleached pulp used as the pulp for the base paper in the present invention, a known bleaching step can be used as appropriate. From the viewpoint of efforts for environmental problems in recent years, it is preferable to use the ozone bleaching step. . If necessary, chlorine dioxide and other bleaching chemicals can be used in combination. As the bleaching stage that can be used in the multi-stage bleaching step of the present invention, a known bleaching stage can be used in addition to the ozone bleaching stage that is preferably used. The pulp after multistage bleaching is sent to a beating process or a papermaking process.

  For the above pulp, mechanical pulp such as ground pulp, pressurized ground pulp, refiner ground wood pulp, thermomechanical pulp, etc., deinked waste paper pulp, waste paper, etc. are used as appropriate as long as they do not interfere with the desired effect of the present invention can do. Furthermore, pulp obtained by making pulp slurry with a paper machine and making it into a sheet in a wet state or a dry state can be disaggregated again to obtain pulp slurry.

  The pulp constituting the base paper is subjected to a beating process, and then sent to a paper machine as a paper stock which is a slurry-like pulp aqueous dispersion. For this paper material, fillers, internally added sizing agents, anionic, nonionic, cationic or amphoteric retention improvers, drainage improvers, paper strength enhancers, etc. It can be added as necessary. As for the papermaking conditions of the base paper, any system such as acidic papermaking, neutral papermaking, and weak alkali papermaking may be used.

  In the present invention, the filler added to the stock and used to form the base paper includes, for example, heavy calcium carbonate, light calcium carbonate, calcium sulfite, gypsum, talc, clay, calcined kaolin, white carbon, amorphous Inorganic pigments such as silica, delaminated kaolin, diatomaceous earth, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, organic pigments such as urea / formalin resin fine particles, micro hollow particles, etc. The filler contained in waste paper, waste paper, etc. can also be reused. Two or more fillers can be used in combination. The filler is generally added so that the paper (base paper) ash content is in the range of 3 to 30% by mass, and preferably 5 to 25% by mass in order to improve the interlayer strength and opacity. Is done.

Specific examples of the internal sizing agent added to the stock in the present invention and used to form the base paper include, for example, alkyl ketene dimer type, alkenyl succinic anhydride type, styrene-acrylic type, higher fatty acid type, petroleum resin And sizing agents such as rosin and rosin.
Specific examples of yield improvers, drainage improvers, and paper strength enhancers include, for example, polyvalent metal compounds such as aluminum (specifically, sulfate bands, aluminum chloride, sodium aluminate, basic aluminum compounds). Etc.), various starches, polyacrylamide, urea resin, polyamide polyamine resin, polyethyleneimine, polyamine, polyvinyl alcohol, polyethylene oxide and the like.

  It is also possible to use a bulking agent and a softening agent having a function of inhibiting the binding between pulp fibers as long as the effects of the present invention are not hindered. Specific examples of bulking agents and softeners include, for example, ester compounds of polyhydric alcohols and fatty acids, polyoxyalkylene compounds of polyhydric alcohols and fatty acid ester compounds, fatty acid polyamidoamines, polyhydric alcohol surfactants, An ionic surfactant etc. can be illustrated. The amount of the bulking agent and the softening agent is generally about 0.05 to 2.0% by mass relative to the pulp in terms of dry weight.

  There are no particular restrictions on the form of the base paper used to form the base paper from the stock containing the filler and chemicals necessary for the slurry-like pulp water dispersion. An on-top former, a gap former, etc. can be illustrated. The gap former type paper machine includes a blade forming type, a roll forming type, and a composite type of these, and any of them can be used. In order to control the surface property of the base paper in order to give the coated paper a non-coated paper texture, it is preferable to use a round net / long net former.

The basis weight of the base paper to be made is not particularly limited, but is usually set in the range of 30 to 400 g / m ² . From the viewpoint of imparting a non-coated paper texture to the coated paper, it is not preferable if the surface smoothness of the base paper before coating is excessively high, and therefore the basis weight lower limit of the base paper to be made is preferably 50 g / m ² or more. . The base paper that has passed through the press part is dried by a drier to obtain a desired amount of water, and then sent to a size press process as necessary or to a coating process for forming a pigment coating layer.

In the size press process, in order to efficiently improve the surface strength of the resulting coated paper and to effectively exhibit the effect of providing a pigment coating layer, starch or polyvinyl is used for the purpose of suppressing coating liquid penetration into the base paper. An aqueous solution or an emulsion type polymer containing a natural or synthetic water-soluble polymer such as alcohol or polyacrylamide is applied to the base paper. In the size press process, the amount of coating when performing a so-called clear size that does not contain a pigment, considering the manifestation of the effect of the size press and the avoidance of operability deterioration due to an increase in the drying load, preferably 0.1 to 3.0 g / ^{m 2} as coated amount, 0.2 to 2.0 g / ^{m 2} is more preferable. A so-called pigment size press in which a coating liquid containing a pigment is applied in the size press step can also be performed.

  As a coating device in the size press process, regardless of whether the coating liquid in the size press process is a clear size press containing no pigment or a pigment size press containing a pigment, a two-roll coater, a gate roll coater, etc. Any known size press coater can be used. In order to avoid a decrease in production efficiency due to troubles such as paper breakage and to ensure coating uniformity, a film transfer type roll coating apparatus is preferable. A film transfer type roll coating device uses a blade or a rod as a measuring device to measure the desired amount of coating liquid on the surface of the roll before contacting the base paper, and apply this coating liquid to the base paper. A size press, that is, coating is carried out by contacting and transferring. In consideration of the durability of the device, the metering device is more preferably a rod metering size press using a rod.

  After passing through the size press process, the size press coating layer is dried with a dryer and sent to the pigment coating layer coating process, but the pigment coating is performed before the size pressing process or after drying after the size pressing process is completed. Before the layer coating process, as long as the desired effect of the present invention is not impaired, a machine calendar by a combination of a metal roll / metal roll, or a combination of a metal roll / elastic roll, if necessary, and a metal roll It is also possible to perform a smoothing finishing process using a smoother or the like which is a combination of a soft calender, a metal roll / elastic roll, and does not heat the metal roll. In order to maintain the uncoated paper texture of the resulting coated paper, it is preferable not to perform a smoothing treatment between the size press step and the pigment coating layer coating step.

  As a coating apparatus for forming the pigment coating layer, it is necessary to use a non-contact metering type coating apparatus. By using a non-contact metering type coating device, the effect of making the coating layer thickness of the pigment coating layer more uniform than when using a contact metering type coating device is obtained. It can be avoided that the surface unevenness is excessively covered and the texture of the non-coated paper is impaired. Here, the non-contact coating type coating device means that after the coating liquid is supplied onto the base paper in the coating process, the measuring section is on the base paper, such as scraping with a blade or measuring at the roll nip. It is not a contact-measuring type coating device that physically contacts the paint, but a coating device that can measure without physical contact with the paint on the base paper. This means a coating apparatus that performs measurement by airflow even if it is a coating apparatus or a post-measuring type coating apparatus. Specific examples of the non-contact metering type coating apparatus include an air knife coater, a curtain coater, a slot die coater, and a spray coater.

  In the present invention, it is essential that the pigment used in the pigment coating layer contains talc having an average particle size of 2.0 to 4.0 μm in an amount of 5 parts by mass or more and less than 40 parts by mass in 100 parts by mass of the pigment. is there.

  Here, the average particle diameter of the pigment referred to in the present invention is a sodium pyrophosphate (trade name: Nankaline S-1, manufactured by Rin Kagaku Kogyo Co., Ltd.). In the 0.1% solution, the pigment concentration was adjusted to 5%, further subjected to dispersion treatment with ultrasonic waves for 5 minutes, and measured by the sedimentation method using Sedigraph 5100 (manufactured by Micromeritics). The mass average particle diameter at the point where the cumulative mass from the coarse particle component side corresponds to 50%.

  When the content of talc in the pigment coating layer is less than 5 parts by mass or when the average particle size is less than 2.0 μm, the effect of improving the scratches and stains is poor, while the content of talc is 40 parts by mass. If it becomes above, the texture of the non-coated paper on the coated paper surface will be impaired. On the other hand, when the average particle diameter exceeds 4.0 μm, problems such as poor stains and reduced ink drying properties occur when coating with a non-contact metering type coating apparatus.

As a pigment to be used for the pigment coating layer, further including a delaminated kaolin having an average particle diameter of 0.5 to 1.0 μm in an amount of 30 parts by mass or less in 100 parts by mass of the pigment, the cosmetic stain is further improved. This is preferable because it can be performed.
When the average particle size of the delaminated kaolin is less than 0.5 μm, the effect of improving the smear due to the blend of the delaminated kaolin is hardly expressed. On the other hand, when the average particle size exceeds 1.0 μm, the ink drying property is lowered. In some cases, it may be difficult to achieve the effect of improving the cosmetic stain. Moreover, when the compounding quantity of a delaminated kaolin exceeds 30 mass parts, the texture of the non-coated paper on the coated paper surface may be impaired.

  The heavy calcium carbonate used for the pigment coating layer has an average particle diameter of 0.5 to 1.0 μm and a ratio of particles having a particle diameter of 0.2 μm or less of less than 15%. More preferably, it is calcium. The inclusion of the heavy calcium carbonate is a preferred embodiment because the printing gloss can be improved while the ink drying property is improved as compared with the case where it is not.

  In addition, since the pigment coating layer contains 10 to 30 parts of cubic light calcium carbonate having an average particle diameter of 0.2 to 0.6 μm in 100 parts by mass of the pigment, the printing gloss can be further improved. More preferred.

  In the coated fancy paper of the present invention, the use of a pigment other than the pigment specified in the present invention used in the pigment coating layer is particularly limited as long as the effect of the coated fancy paper of the present invention is not hindered. For example, ordinary kaolin, calcined kaolin, structured kaolin, engineered kaolin, various kaolins such as delaminated kaolin, purified natural mineral pigments such as heavy calcium carbonate (ground calcium carbonate), light calcium carbonate (Synthetic calcium carbonate), composite synthetic pigment of calcium carbonate and other hydrophilic organic compounds, satin white, barium sulfate, zinc sulfate, titanium dioxide, silica, alumina, aluminum hydroxide, zinc oxide, magnesium carbonate, hollow or dense Real organic pigment plastic pigment, adhesive pigment, plastic Tic beads, mixed appropriately within a range not impairing the effects of the present invention and microcapsules may also be used.

  Adhesives used in the coating layer include starch purified from natural plants, hydroxyethylated starch, oxidized starch, etherified starch, phosphate esterified starch, enzyme-modified starch, and cold water soluble obtained by flash drying them Various starches such as starch, starch derivatives such as carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, natural polysaccharides such as dextrin, mannan, chitosan, arabinogalactan, glycogen, inulin, pectin, hyaluronic acid and oligomers thereof Examples include modified products. Furthermore, natural polymers such as casein, gelatin, soybean protein, and collagen, and modified products thereof, and synthetic polymers and oligomers such as polylactic acid and peptides can be mentioned. In addition, copolymer latex such as styrene butadiene, acrylic, polyvinyl acetate, ethylene vinyl acetate, polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, modified polyvinyl pyrrolidone, sodium polyacrylate, polyethylene oxide, polyacrylamide, Examples include water-soluble synthetic compounds such as urea or melamine / formalin resin, polyethyleneimine, polyamidepolyamine / epichlorohydrin. One or more of these can be used. In addition, the use of a known natural or synthetic organic compound is not particularly limited.

  As a styrene butadiene copolymer latex (hereinafter referred to as SBR latex) that can be used as an adhesive, when the average particle diameter of the latex particles is 50 to 120 nm, the amount of adhesive used can be reduced, and the ink drying property can be reduced. It is preferable because it can contribute to improvement. From the viewpoint of the balance between the amount of SBR latex used and the ink drying property, the SBR latex average particle size is more preferably 60 to 90 nm. The average particle size of the latex is obtained by treating the latex with osmic acid, photographing it with a transmission electron microscope at a magnification of 50,000 times, and measuring the particle size of about 200 polymer latex particles in the resulting micrograph. It can also be obtained by a number average, or as a simpler method, it can also be obtained by measurement using a submicron particle analyzer model N4 (manufactured by Beckman Coulter).

  In addition, as a thickener used in the coating liquid as necessary, cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxymethyl cellulose, gums such as sodium alginate, xanthan gum, guar gum, water solubles such as casein, sodium polyacrylate, etc. Synthetic polymers such as water-soluble polymers, polyacrylates and styrene-maleic anhydride copolymers, and inorganic polymers such as silicates.

  In addition, if necessary, various commonly used assistants such as dispersants, wetting agents, fluidity modifiers, antifoaming agents, water resistance agents, printability improvers, preservatives, slime control agents, and coloring agents. Agents and those obtained by cationizing these various auxiliary agents are preferably used.

  When a fluorescent dye is used to adjust the whiteness of the coated paper, the polyvinyl alcohol acts as a carrier of the fluorescent dye by using polyvinyl alcohol as an adhesive, and excessive movement of the fluorescent dye to the base paper is prevented. It is preferable for suppressing and showing a good fluorescent whitening effect.

  There is no particular limitation on the solid content concentration of the aqueous coating liquid for forming the pigment coating layer, but there is no particular limitation, but in order to obtain a desired coating amount, the solid content concentration of the paint is 20 to 55 mass. %, And more preferably 25 to 45% by mass.

The coating amount of the pigment coating layer is 3 to 15 g / side, considering the blank paper quality, print quality, suitability for coating and processing, etc. while maintaining the texture of the non-coated paper with the obtained coated paper. It is adjusted to a range of m ^2. The coating amount per side is preferably adjusted to 4 to 12 g / m ² . When the coating amount is less than 3 g / m ² , the improvement in printability due to the provision of the pigment coating layer cannot be expected. On the other hand, when the coating amount exceeds 15 g / m ² , the uncoated paper texture is impaired. It is.

  The number of pigment coating layers provided on the base paper needs to be one or more per one side of the base paper, but the surface unevenness of the base paper is not excessively smoothed and the texture of the non-coated paper is not impaired. Therefore, it is preferable that the number of the pigment coating layers per one side of the base paper is one.

  After providing the pigment coating layer, a smoothing process using a super calender device can be performed as in the case of production of general coated paper. Examples of the calendar device that can be used include a calendar device that performs gloss finishing such as a hard nip calendar, a super calendar, a soft calendar, and a gloss calendar. From the viewpoint of maintaining the texture of the non-coated paper, it is preferable to use a calendering process with a linear pressure of 100 kN / m or less and 2 nips or less, more preferably a linear pressure of 50 kN / m or less, and a smoothing process is performed. Most preferably not.

  Moreover, the embossing process which provides an uneven | corrugated pattern on the surface using an embossing roll can also be performed with respect to the obtained coated paper. From the viewpoint of preventing the printing uniformity from changing due to the change in the coating layer thickness due to the embossing treatment, it is preferable not to perform the embossing treatment.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the scope of the examples. In the examples, “parts” and “%” indicate “parts by mass (solid component)” and “mass%” unless otherwise specified.

(Preparation of paper substrate)
After adding 10 parts of light calcium carbonate (trade name: Tama Pearl TP-121, manufactured by Okutama Kogyo Co., Ltd.) as a filler to 100 parts of LBKP, 1.5% aluminum sulfate, cationic starch (commodity) with respect to the total solid content of the pulp slurry Name: Ace K100, manufactured by Oji Cornstarch Co., Ltd.) 0.5%, alkyl ketene dimer sizing agent (trade name: Size Pine K-287, manufactured by Arakawa Chemical Co., Ltd.) 0.4%, polyacrylamide (trade name: Polystron 851, Arakawa Chemical Co., Ltd.) 1.5% was sequentially added to prepare a paper stock. This stock was made with a long web former to obtain a base paper having a basis weight of 107.9 g / m ² .

(Adjustment of coating solution)
0.4 parts of a dispersant (trade name: Aron T-50, manufactured by Toagosei Co., Ltd.) was added to talc to prepare a slurry having a concentration of 60%. Further, 0.1 part of a dispersant (trade name: Aron T-50, supra) was added to delaminated kaolin to prepare a slurry having a concentration of 70%. Light calcium carbonate supplied as a powder was prepared by adding 0.3 part of a dispersant (trade name: Aron T-50, supra) to prepare a slurry having a concentration of 55%.
After adding talc slurry, delaminated kaolin slurry, heavy calcium carbonate slurry and light calcium carbonate slurry in the formulation shown in Table 1 and stirring, 3 parts starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) Add 15 parts of latex (trade name: OJ-3000H, manufactured by JSR Corporation, average particle size 80 nm), add antifoaming agent and dye sequentially as an auxiliary agent, add water and add water for pigment coating layer. A liquid was obtained. The following pigments were used for the coated fancy papers of Examples and Comparative Examples described in Tables 1 to 4.

(Talc type)
T1: Trade name PD-680, manufactured by WMC Industrial Minerals, average particle size 2.8 μm
T2: Product name Microace P-3, manufactured by Nippon Talc Co., Ltd., average particle size 1.8 μm
T3: Product name Talc 80, manufactured by Katsumiyama Mining Co., Ltd., average particle size 5.0 μm

(Kaolin type)
D1: Delaminated kaolin, trade name Hydra scene, manufactured by KaMin, average particle size: 0.14 μm
D2: Delaminated kaolin, trade name Astra Plate, manufactured by Imerizu Minerals Japan, average particle size: 0.96 μm
D3: Delaminated kaolin, trade name Capim DG, manufactured by Imerys Minerals Japan, average particle size: 0.61 μm
D4: Delaminated kaolin, trade name: NuSurf, manufactured by BASF, average particle size: 2.1 μm

(Heavy calcium carbonate type)
G1: Product name Hydrocurve 90, manufactured by Phimatech Co., Ltd., average particle size: 0.64 μm, ratio of particles of 0.2 μm or less: 17%
G2: manufactured by Pfema Tech Co., Ltd., average particle size 0.64 μm, proportion of particles having a size of 0.2 μm or less: 9%
G3: Trade name Escaron 1500, manufactured by Sankyo Flour Milling Co., Ltd., average particle size: 2.2 μm, particle ratio of 0.2 μm or less: 2%

(Light calcium carbonate type)
P1: Product name TP-221GS, manufactured by Okutama Kogyo Co., Ltd., average particle size 0.45 μm, spindle shape P2: Product name Brilliant 15, manufactured by Shiroishi Calcium Industry Co., Ltd., average particle size 0.34 μm, cubic shape P3: Product name Tama Pearl TP-121, manufactured by Okutama Kogyo Co., Ltd., average particle size 1.4 μm, spindle shape

(Creating coated paper)
Apply a water-based coating solution to the base paper using the coating method shown in Table 1, and apply a pigment coating layer to both sides of the base paper so that the dry weight coating amount is the coating amount shown in Table 1 per side. Provided.
In Example 16, the latex “OJ-3000H” having an average particle diameter of 80 nm was changed to a different latex (trade name: T-2535D, manufactured by JSR Corporation, average particle diameter of 115 nm), and the number of latex blending parts was 15 From 20 parts to 20 parts.
In Example 18, two nips were processed under the condition of a linear pressure of 10 kN / m using a super calender composed of a metal roll and a resin roll. In Comparative Example 7, 4 nips were processed under the condition of a linear pressure of 150 kN / m using the same super calendar.
In Example 19, a grain embossing roll having an irregular concavo-convex pattern was used, and embossing was performed at a nip pressure of 90 kN / m after the coating / drying step.
In Comparative Example 13, talc was not used, and a hollow plastic pigment (trade name: AE852, manufactured by JSR Corporation, described as PP in the column of talc type in Table 1) was used.

  As the evaluation of the coated paper obtained in Examples and Comparative Examples, blank paper gloss, printing gloss, rust scratches, rust stains, ink drying properties and uncoated paper texture were evaluated according to the following, and the evaluation results are shown in Table 1. To Table 4.

<Blank gloss evaluation>
According to ISO 8254-1 (1999), the gloss value at an incident / light receiving angle of 75 degrees was measured using a gloss meter (model: GM-26D, manufactured by Murakami Color Research Laboratory Co., Ltd.).

<Print gloss evaluation>
In accordance with ISO 2813 (1994), the gloss value at an incident / light receiving angle of 60 degrees was measured using a gloss meter (model: GM-26D, manufactured by Murakami Color Research Laboratory Co., Ltd.).

<Scratch assessment>
Using a friction tester for dyeing fastness (manufactured by Toyo Seiki Seisakusho), two uncoated papers were made to face each other and subjected to a four-way reciprocation under the condition that a load of 500 g was applied to conduct a scratch test. After the test, the difference in glossiness between the rubbed portion of the coated paper and the non-rubbed portion was visually evaluated, and a scratch was evaluated. The higher the score, the better the scratches are not noticeable.

<Cosmetic dirt evaluation>
Using an RI printing tester, 0.6 g of black ink (trade name: Varius G black S type, manufactured by Dainippon Ink, Inc.) was weighed and developed, and printing was performed on each coated paper. After printing, let stand at room temperature for 24 hours to dry the ink, then use a friction tester for dyeing fastness (described above), with the printed surface and the non-printed surface facing each other, under a condition where a load of 500 g is applied. The cosmetic stain test was performed by reciprocating 4 times. After the test, the stain condition of the black ink on the non-printed surface was visually evaluated to evaluate the smudge. The higher the score is, the less the cosmetic stain is.

<Evaluation of ink drying properties>
Using an RI printing tester, 0.6 g of black ink (trade name: Varius G black S type, manufactured by Dainippon Ink, Inc.) is weighed and developed, printed on test paper, and immediately after printing. In the roll nip, the printed surface and the general PPC paper whose smoothness was improved by calendaring were opposed to each other and pressed to compare the ink transfer properties to the PPC paper. It was judged that the higher the ink transfer property to the PPC paper, the lower the ink drying property, and the ink transfer property was visually evaluated as the ink drying property to evaluate the ink drying property. The higher the score, the better the ink drying property.

<Uncoated paper texture>
The non-coated paper texture of the coated paper obtained in the examples and comparative examples is evaluated by visual evaluation of the surface properties, and the touch feeling is comprehensive, including whether the coated paper or non-coated paper is close to the touch. Evaluated. The higher the score, the better the uncoated paper texture.

  In the evaluation of the coated paper, when the evaluation score is 4 or less, the quality is inferior, and the coated paper is low in practicality.

  The coated fancy paper of the present invention is a mat-like coated paper having a texture of non-coated paper, which is less likely to cause scratches and stains on the coated surface, and has excellent printing quality such as excellent ink drying properties. Because it is a very good high-quality coated fancy paper, it is expected to contribute to the expansion of the fancy paper application field, and it is also a highly productive fancy paper. It can fully meet the increasing demand.

Claims (6)

Matte-coated fancy paper having a pigment coating layer mainly composed of a pigment and an adhesive formed on a non-contact metering type coating device on at least one side of a base paper, wherein the pigment coating layer is In addition, 100 parts by mass of the total pigment contains 5 parts by mass or more and less than 40 parts by mass of talc having an average particle size of 2.0 to 4.0 μm, and 30 parts by mass or more of light calcium carbonate and / or heavy calcium carbonate. A white paper containing a pigment coating layer having a coating amount after drying of 3 to 15 g / m ² per side and having an incident / light receiving angle of 75 degrees measured according to ISO 8254-1 (1999) on the coated surface. A coated fancy paper having a glossiness of 3 or more and less than 20.   The said pigment coating layer is a pigment coating layer which further contains the delaminated kaolin with an average particle diameter of 0.4-1.0 micrometer in the quantity of 30 mass parts or less in 100 mass parts of all the pigments. Coated fancy paper as described in.   The heavy calcium carbonate in the pigment coating layer has an average particle diameter of 0.5 to 1.0 μm, and the ratio of particles having a particle diameter of 0.2 μm or less is less than 15% by mass. The coated fancy paper according to claim 1 or 2.   The coated fancy paper according to any one of claims 1 to 3, wherein the pigment coating layer is a pigment coating layer containing 10 to 30 parts of cubic light calcium carbonate in 100 parts by mass of all pigments.   The coating fancy paper according to any one of claims 1 to 4, wherein the coating device using the non-contact metering type is a coating device selected from an air knife coater, a curtain coater, a slot die coater, and a spray coater.   The coating according to any one of claims 1 to 5, wherein neither the base paper surface on which the coating layer is formed nor the coating surface after the pigment coating layer is provided is a surface that is not subjected to calendar treatment. Fancy paper.