JP2009097098A - Method for producing coated paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing coated paper by which the coated paper having good glossiness can be obtained even when a calendering treatment is carried out. <P>SOLUTION: The method for producing the coated paper includes: a coating step of coating uncoated base paper having ≤4 wt.% of moisture content with a coating liquid containing at least a pigment in a prescribed coating amount to obtain coated paper before calendering; and a calendering step of applying the calendering treatment to the coated paper before the calendering. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing coated paper.

  In recent years, the visualization and colorization of printed matter has progressed rapidly, and the demand for coated paper having a smooth coating layer on the paper surface as an ink-receiving layer is increasing year by year compared to non-coated printing paper. In addition, with the recent trend toward cost reduction, there is an increasing demand for weight reduction while maintaining the conventional paper thickness and print quality. The smoothness of the coating layer is important for the printing quality of the coated paper, and the surface is generally smoothed with a super calender or soft nip calender. However, this process pressurizes the paper to increase the smoothness of the surface, and at the same time the density increases and the paper thickness decreases. For this reason, if the paper thickness is maintained, the weight of the paper increases.

Therefore, lightweight pigment coated paper having glossiness and smoothness has been developed. For example, a technique of smoothing with a calender device composed of an elastic roll and a metal roll in a state where the moisture content of the support is 2 to 8% and providing a pigment coating layer of 1.5 to 10 g / m ² per side (Patent Document) 1) In a method for producing a coated paper having a coating layer of 1.5 to 10 g / m ² per side, from a specific roll at a moisture content of 2 to 8% by weight of the base paper in front of the coating device A technique (Patent Document 2) and the like for performing a smoothing process with a configured calendar device is disclosed.
Japanese Patent Laid-Open No. 5-44192 JP-A-6-146197

In coated paper, it is desired that the glossiness is excellent even when the coating liquid is applied in large amounts. However, the techniques of Patent Documents 1 and 2 provide a lightweight coating with a pigment coating layer of 10 g / m ² or less. This is a technique for improving the glossiness of paper, and such a case where the amount of coating is large has not been studied.

In the present invention, when the coating amount is large, for example, when the coating amount is 10.5 g / m ² or more in terms of solid content, a coated paper having good glossiness of the coated paper even when subjected to calendar treatment is obtained. It aims at providing the manufacturing method of the coated paper obtained.

The present inventors examined the relationship between the coating amount of the coating liquid containing the pigment and the moisture content of the uncoated base paper, and the coating amount exceeds 10 g / m ² when the moisture content of the uncoated base paper is small. As a result, the present invention was completed.

The present invention comprises a coating step of applying a coating solution containing at least a pigment to uncoated base paper to obtain a pre-calendar coated paper, and a calendar step of calendering the pre-calendar coated paper A method for producing paper,
The coating step is a step of applying a coating liquid to an uncoated base paper having a water content of 4% by weight or less, and the coating amount of the coating liquid (in terms of solid content) is about one side of the uncoated base paper 10.5 g / m ² or more,
The present invention relates to a method for producing coated paper.

  According to the present invention, it is possible to provide a method for producing a coated paper that can obtain a coated paper having a good glossiness even when subjected to a calendar process.

  The coated paper is produced, for example, through a press process, a drying process, a sizing process, a drying process, a coating process, a drying process, and a calendar process after a thin layer of pulp raw material is formed on a wire mesh to form a paper layer. . The present invention is characterized by the coating process among these processes. Here, in the present invention, the paper before the coating process is called uncoated base paper, and the paper after the coating process and before the calendar process is called pre-calendar coated paper. Further, the paper after the calendar process may be referred to as post-calendar coated paper.

[Coating process]
The coating process according to the present invention is a process for obtaining a pre-calendar coated paper by applying a coating solution to an uncoated base paper having a water content of 4% by weight or less. The application of the coating liquid may be on one side or both sides of the uncoated base paper. When the coating liquid is applied to both sides of the uncoated base paper, that is, when the coating is performed twice or more, the water content of the base paper is set to 4% by weight or less at least once. Preferably, all are carried out at 4% by weight or less, more preferably 3% by weight or less, and further preferably 2% by weight or less.

  In the present invention, the gloss of the coated paper obtained can be increased. The reason for this is that when the water content in the uncoated base paper used in the coating process is adjusted to a low level, the water in the coating solution rapidly permeates into the base paper, so that it can be applied on the base paper surface. The solid content of the liquid increases rapidly. As a result, the coating pigment stays on the base paper surface without penetrating into the base paper, so that the thickness of the coating layer on the base paper surface is maintained, the surface of the coating layer is further flattened by calendering, and the calendar process is performed. It is estimated that the gloss of the coated paper that has passed is improved.

  Examples of the method for adjusting the moisture content of the uncoated base paper include a method for adjusting the conditions of the drying step before the coating step. The drying method in the drying step is not particularly limited, and for example, steam drying, gas heater drying, electric heater drying, infrared heater drying and the like can be used. Also, a method of adjusting the moisture content of the uncoated base paper by increasing the moisture content from a more dry state, for example, a method of increasing the moisture content to a desired moisture content after setting the moisture content to 0% by weight Can also be used.

  The moisture content of the uncoated base paper is known, for example, by measurement using a BM meter (Basis weight / Moisture (basis weight / moisture) meter) or by measuring the weight loss by completely drying the uncoated base paper. be able to.

  As the uncoated base paper, a normal coated base paper can be used. As a paper making method for obtaining an uncoated base paper, a general paper machine such as a long net type, a circular net type, a short net type, a twin wire type, and an inclined wire type paper machine can be used. In particular, the twin wire type is preferable from the viewpoint of reducing the difference between the front and the back of the paper.

  As the pulp used for the base paper, any pulp made from wood or grass fibers, which are vegetable fibers, can be used. That is, bleached chemical pulp (NBKP, LBKP, etc.), mechanical pulp (TMP, CTMP, GP, RGP, etc. and bleached pulp), high yield pulp (SCP, CGP, etc. and bleached pulp) and In addition, recovered pulp such as waste paper pulp and deinked waste paper pulp (DIP) and bleached pulp (BDIP) can be used. From the point of gloss of the coated paper, it is preferable to contain 50% by weight or more of chemical pulp in the pulp to be used.

  When making paper, a sizing agent, a filler, a yield improver, a drainage improver, a paper strength improver and the like that are generally used may be added as necessary. Examples of sizing agents include alkyl ketene dimer sizing agents, alkenyl succinic anhydride sizing agents, and neutral rosin sizing agents. Examples of the filler include calcium carbonate.

  Further, from the viewpoint of reducing the density, the uncoated base paper may be obtained by making a paper after adding a fiber binding inhibitor to the pulp slurry.

  The fiber binding inhibitor is a compound having an action of inhibiting binding between pulp fibers. Examples of the fiber binding inhibitor include compounds used as a surfactant having a hydrophobic group and a hydrophilic group. For example, a bulking agent for paper can be used. In the bulking agent for paper, it is presumed that hydrophilic groups are adsorbed on the pulp surface, and binding between pulp fibers is inhibited by hydrophobic groups. And since the space | gap in uncoated base paper is kept large rather than the case where the bulking agent for paper is not added, it is thought that it becomes a low density. The fiber binding inhibitor can be regarded as a so-called internal additive for papermaking, and the addition to the pulp slurry can be emulsified or dispersed in water. Examples of the compound include fatty acid polyhydric alcohol ester which is an ester of polyhydric alcohol and fatty acid, polyoxyalkylene adduct of fatty acid polyhydric alcohol ester, polyoxyalkylene adduct of higher fatty acid ester, ester of polyhydric fatty acid and alcohol. Polyhydric fatty acid alcohol ester, polyoxyalkylene adduct of polyhydric fatty acid alcohol ester, polyoxyalkylene adduct of polyamine and fatty acid ester compound, anion to the hydroxyl group of ester compound of polyhydric alcohol and fatty acid or hydroxyl carboxylic acid Ester compounds such as compounds having a group introduced therein, ester compounds of fatty acid amine polyoxyalkylene adducts and fatty acids, higher alcohol polyoxyalkylene adducts and fatty acid ester compounds, and the like Conductor: Fatty acid monoamide, polyoxyalkylene adduct of fatty acid amide amine, fatty acid polyamide amine, fatty acid diamide amine, polyalkylene polyamine / fatty acid / epichlorohydrin condensate, polyalkylene polyamine / fatty acid / urea condensate, polyvalent fatty acid and polyamine Amide compounds such as amide compounds, polyamides of polyhydric fatty acids and linear amines, and derivatives thereof; polyoxyalkylene adducts of fatty acid amide amines and ester compounds of fatty acids, etc. Compounds having higher alcohols; polyoxyalkylene adducts of higher alcohols or higher fatty acids, polyhydric alcohol-type nonionic surfactants, sugar alcohol-based nonionic surfactants, sugar-based nonionic surfactants, oil-based nonionic surfactants , Etc. other than the above Alkylene adducts and derivatives thereof; as other compounds, higher alcohols, sulfosuccinic acid derivatives, heavy units having structural units containing a surface active moiety and structural units derived from one or more of anionic monomers and cationic monomers. Coalescence, etc. can be used. Among these, from the viewpoint of reducing the density of the coated paper, it is preferable to use ester compounds and derivatives thereof, amide compounds and derivatives thereof, polyoxyalkylene adducts other than those described above, and derivatives thereof. More preferably, alcohol esters, fatty acid monoamides, polyalkylene polyamine / fatty acid / epichlorohydrin condensates, polyalkylene polyamine / fatty acid / urea condensates, polyoxyalkylene adducts of higher alcohols, and the like are used.

  The fiber binding inhibitor is preferably used in a proportion of 0.01 to 10 parts by weight, and further 0.1 to 5 parts by weight with respect to 100 parts by weight of the pulp. In addition, when using a fiber bond inhibitor, it is preferable to use together the fixing accelerator which accelerates | stimulates the fixing to the pulp of fiber bond inhibitors, such as a polyacrylamide polymer, a cationized starch, and a sulfuric acid band.

  In the present invention, the uncoated base paper can be calendered from the viewpoint of improving the gloss of the coated paper. As the calendar processing, a calendar device such as a machine calendar, a super calendar, a soft calendar, or a gloss calendar can be used, and these may be used in combination.

  Furthermore, as the uncoated base paper used in the coating process, a coated paper with a water-soluble polymer aqueous solution can be used from the viewpoint of improving the gloss of the coated paper. Here, “water-soluble polymer” means that when 1 part by weight of the target polymer is added to 99 parts by weight of water at 25 ° C., 90% by weight or more dissolves. The solubility is calculated from the solid content in the filtrate by filtering the aqueous solution with a filter paper (No. 2). In the present invention, a water-soluble polymer having a dissolution amount of 95% by weight or more is preferably used. The water-soluble polymer aqueous solution can be regarded as a so-called external additive for papermaking, and is different from the fiber binding inhibitor in this respect. The uncoated base paper may be obtained by applying a water-soluble polymer aqueous solution on either one side or both sides. When uncoated base paper with a water-soluble polymer aqueous solution applied on the surface is used, penetration of the pigment into the base paper is suppressed when the coating liquid is applied, and the thickness of the coating layer is maintained, and calendar treatment is performed. It is estimated that the gloss of the resulting coated paper is improved because the surface of the coated layer is flattened. Examples of water-soluble polymers include cellulose compounds such as sodium carboxymethyl cellulose, methyl cellulose, ethyl cellulose, and hydroxyalkyl cellulose; starches such as starch, oxidized starch, carboxymethyl starch, dialdehyde starch, phosphate ester-modified starch, and hydroxyalkyl-modified starch. Sugars such as sucrose and lactose; natural polymers other than the above such as glue, gelatin, casein, agar, etc .; polyvinyl alcohols such as polyvinyl alcohol and modified polyvinyl alcohol; poly (meth) acrylic acid alkali salts, (meth) (Meth) acrylic polymers such as alkali salts of acrylic acid / (meth) acrylic acid ester copolymers, alkali salts of acrylic acid / maleic acid copolymers; polyacrylamide polymers, modified polyacrylamides, styrene / maleic acid system Synthetic polymers other than the above, such as coalescence, water-soluble polyester, polyethylene oxide and polyvinylpyrrolidone; (meth) acrylic acid ester or (meth) acrylamide having a dialkylamino group, styrene having a dialkylamino group, vinylpyridine, N -A vinyl heterocyclic compound, an acid neutralized product of a monomer having an amino group, or a cationic group-containing vinyl monomer such as a quaternary ammonium salt or diallyl-type quaternary ammonium salt; and N-alkyl (meth) acrylamide, A vinyl copolymer obtained by polymerizing a monomer containing at least one selected from hydrophilic nonionic group-containing vinyl monomers such as N, N-dialkyl (carbon number 1 to 3) -substituted (meth) acrylamide. A polymer is mentioned. The vinyl monomers can be used alone or in admixture of two or more. The vinyl copolymer is preferably a cationic group-containing vinyl copolymer obtained by polymerizing a monomer containing a cationic group-containing vinyl monomer and a hydrophilic nonionic group-containing vinyl monomer, A cationic group-containing vinyl copolymer obtained by polymerizing a monomer mainly composed of a cationic group-containing vinyl monomer and a hydrophilic nonionic group-containing vinyl monomer is more preferable. Moreover, the vinyl copolymer which contains the crosslinkable vinyl monomer which has at least 2 vinyl group etc. in a molecule | numerator as a structural component in the said vinyl copolymer is also mentioned. In the constituent monomer, the cationic group-containing copolymer preferably has a total of 80 to 100 mol% of the hydrophilic nonionic group-containing vinyl monomer and the cationic group-containing vinyl monomer. More preferably, it is 90-99.9 mol%. Among these, starch, cellulose compounds, polyvinyl alcohols, and cationic group-containing compounds obtained by polymerizing monomers mainly composed of cationic group-containing vinyl monomers and hydrophilic nonionic group-containing vinyl monomers One or more compounds selected from vinyl copolymers are preferred. The concentration of the water-soluble polymer in the water-soluble polymer aqueous solution is preferably 0.1 to 15% by weight, and more preferably 0.5 to 5% by weight. The water-soluble polymer aqueous solution is preferably different from the coating solution from the viewpoint of weight reduction of the coated paper.

  The viscosity (25 ° C.) of the water-soluble polymer aqueous solution is preferably 1 to 5000 mPa · s, and more preferably 1 to 3000 mPa · s from the viewpoint of ease of application.

  The application of the water-soluble polymer aqueous solution can be performed using a normal paper coating apparatus, and is not particularly limited, but as the coating apparatus, a 2-roll size press coater, a gate roll coater, a blade metal Film transfer type roll coater such as ring size press coater, rod metal ring size press coater, shim sizer, curtain coater, die coater, gravure coater, kiss coater, rod (bar) coater, air knife coater, blade coater, roll coater, spray Etc.

The coating amount of the water-soluble polymer aqueous solution is not particularly limited, but from the viewpoint of weight reduction, an amount of 0.01 to 15 g / m ^{2 in} terms of solid content per side is preferable, and is 0.1 to 10 g / m ² . Is more preferred.

  In the present invention, the glossiness of the uncoated base paper (after coating when a water-soluble polymer aqueous solution is applied) according to JIS-P8119 is 5 to 100 seconds, and further 7 to 80 seconds. It is preferable from the viewpoint. When the smoothness is 5 seconds or more, the printability of the coated paper after coating is good. When the smoothness is 100 seconds or less, the nip pressure at the time of calendar processing for obtaining the smoothness is appropriate, and the density increases due to the crushing of the paper. Suppress.

  The coating liquid contains at least a pigment, and examples thereof include pigment paint (coating color). Examples of the pigment include kaolin, precipitated calcium carbonate, finely ground heavy calcium carbonate, wax stone clay, and titanium dioxide. Inorganic pigments such as satin white, barium sulfate and aluminum hydroxide, and organic pigments such as plastic pigments can be used. Among these, inorganic pigments are preferable from the viewpoint of economy.

  In addition, it is preferable to add an adhesive (binder) to the coating solution. As the adhesive, aqueous solutions of polymer such as casein, starch derivatives, and fiber derivatives, SBR (styrene butadiene rubber), MBR (methyl methacrylate butadiene). A synthetic latex emulsion such as rubber) is exemplified. The ratio of the pigment to the adhesive can be increased or decreased depending on the type and application of the pigment. In addition to pigments and adhesives, paint additives such as dyes, antifoaming agents, lubricants, dispersants, viscosity modifiers, and pH control agents can be used in combination with the coating liquid. The remainder of the coating liquid is usually water, and the solid content concentration is preferably 30% by weight or more, preferably about 40% by weight in the case of an air knife coater, and 50% by weight or more in the case of a blade coater.

In the present invention, from the viewpoint of obtaining a coated paper with high gloss, the coating amount (in terms of solid content) of the coating liquid is 10.5 g / m ² or more per side of the uncoated base paper, and 11 g / m ² or more. Is preferable, 11-25 g / m < ² > is still more preferable, and 12-20 g / m < ² > is more preferable.

  Application of the coating liquid to uncoated base paper can be performed using a normal paper coating apparatus, and although not particularly limited, as a coating apparatus, a two-roll size press coater or a gate roll Film transfer type roll coater such as coater, blade metering size press coater, rod metering size press coater, shim sizer, curtain coater, die coater, gravure coater, kiss coater, rod (bar) coater, air knife coater, blade coater, Examples include roll coaters and sprays. The method for drying the pre-calendar coated paper is not particularly limited, and examples thereof include steam drying, gas heater drying, electric heater drying, and infrared heater drying.

[Calendar process]
The calendar process according to the present invention is a process of calendering the pre-calendar coated paper obtained in the coating process. The calendar process can be performed multiple times.

  In the calendar process, a calendar device such as a super calendar, a soft calendar, a machine calendar, or a gloss calendar can be used, and these may be used in combination. The surface temperature of the calendar is not particularly limited, but it is preferably performed at 25 ° C. or higher. From the viewpoint of obtaining coated paper with high gloss, it is preferable to use a super calender device.

  From the viewpoint of the gloss of the coated paper of the present invention, the calender pressure (pressure applied to the paper measured by the method described in Examples) is preferably 25 to 80 MPa, more preferably 25 to 50 MPa. In addition, the number of calendar processes is preferably 2 or more from the viewpoint of increasing gloss.

  In the manufacturing method of this invention, you may have a humidity control process which raises the moisture content of a coated paper after a calendar process further.

[Coated paper]
The coated paper of the present invention is obtained by the production method of the present invention as described above, and preferably has a density of 1.2 g / cm ³ or less, and 1.1 to 0.8 g / cm. ³ is preferable, and 1.0 to 0.8 g / cm ³ is more preferable.

  The coated paper of the present invention can be applied to various types of paper. For example, mention may be made of paper made of acid, neutral or alkaline paper, such as coated paper used for book paper or magazines, printing paper such as coated paper used in catalogs and posters, or ink jet paper or packaging paper. it can.

  More specifically, it is suitable for cast coated paper, A0 art paper, A1 art paper, A2 coated paper, A3 coated paper, lightweight coated paper, medium coated paper, and the like.

<Example 1>
(1) Manufacture of uncoated base paper Chemical pulp LBKP (hardwood bleached pulp) was used as a pulp raw material, and it was disaggregated and beaten with a beater at 25 ° C. to obtain an LBKP slurry having a pulp concentration of 2.2% by weight. The Canadian standard freeness (JIS P 8121) of this product was 450 ml. The LBKP slurry is weighed so that the basis weight of the sheet after paper making is about 80 g / m ² , and then diluted with water so that the pulp concentration becomes 0.5% by weight. The paper was made with 80 mesh wire and a wet sheet was obtained. The wet sheet after paper making was pressed with a press at 3.5 kg / cm ² for 5 minutes and dried at 105 ° C. for 2 minutes using a drum dryer to obtain a pulp sheet. The resulting pulp sheet was conditioned for 12 hours under conditions of 23 ° C. and 50% relative humidity, and then subjected to a calendar treatment of the pulp sheet under the following conditions, and an uncoated base paper having a smoothness of 15 seconds measured with a Beck smoothness meter. Got. The moisture content of the uncoated base paper after humidity control was 5% by weight.
<Calendar processing conditions for pulp sheet>
Calendering (linear pressure: 10 kg / cm, processing speed: 10 m / min, roll temperature: 80 ° C.) under the conditions of 23 ° C. and relative humidity of 50% using a lab calendar device (30FC-200E super calender manufactured by Kumagaya Riki Kogyo Co., Ltd.) 2 times of treatment).

(2) Manufacture of coated paper (coating process and calendar process)
The uncoated base paper is dried to a moisture content of 0% by weight. On the first surface of the base paper (pulp sheet), 50 parts of heavy calcium carbonate, 50 parts of fine kaolin, dispersant (poise 535M) : Made by Kao) 0.075 parts, 0.02 part of sodium hydroxide, 11 parts of latex, 3 parts of starch, water was added to adjust the coating liquid to a solid content concentration of 55% by weight. The coating was carried out so that the coating amount was 15.5 g / m ² (in terms of solid content) per side. After coating, it was dried at 105 ° C. for 2 minutes using a drum dryer. Next, the one-side coated paper is dried to a moisture content of 0% by weight, and the coating liquid is applied to the second surface that is not yet coated (the surface opposite to the first surface, the uncoated surface). Coating was carried out with a blade coater so that the coating amount was 15.5 g / m ² (solid content conversion) per side. After coating, it was dried at 105 ° C. for 2 minutes using a drum dryer to obtain double-sided coated paper (pre-calendar coated paper).

Next, the obtained double-sided coated paper was calendered under the following conditions so that the first surface was in contact with the metal roll. Next, the double-sided coated paper is calendered on the double-sided coated paper under the following conditions so that the second side is in contact with the metal roll, and the humidity is adjusted for 12 hours under the conditions of 23 ° C. and 50% relative humidity. Thus, a coated paper having a water content of 5% by weight in the paper was obtained.
<Calendar processing conditions for double-sided coated paper>
Calendering (linear pressure 200 kg / cm, processing speed 10 m / min, roll temperature 80 ° C.) under the conditions of 23 ° C. and relative humidity 50% using a lab calender device (30FC-200E super calendar manufactured by Kumagaya Riki Kogyo Co., Ltd.) , The number of treatments was once). The temperature setting of the apparatus was used for the metal roll surface temperature of the calendar apparatus. As a precaution, we measured with a thermometer (DIGIITAL THERMOMETER MODEL 2455 (iuchi)) and confirmed that the temperature was correct.

<Examples 2-3 and Comparative Examples 1-5>
In Example 1, coated paper was obtained with the moisture content of the uncoated base paper and the coating amount of the coating liquid as values shown in Table 1, respectively. In all cases, the smoothness of the uncoated base paper measured with a Beck smoothness meter was in the range of 14 to 16 seconds.

  The moisture content of the uncoated base paper was measured as follows. Cut the uncoated base paper into a size of 12 cm x 12 cm, put it in a 200 ml media vial, dry at 105 ° C for 30 minutes, seal with a lid and cool to room temperature to obtain an uncoated base paper. The moisture content of the uncoated base paper was 0% by weight. Next, when the moisture content of the uncoated base paper having a weight of 0% by weight is adjusted at 23 ° C. and a relative humidity of 65%, and when the desired moisture content is obtained while checking the weight increase, Coating is performed, and the moisture content at this time is defined as the moisture content of the uncoated base paper. The moisture content represents the weight percent of water relative to the weight of the paper.

  Further, the relationship between the linear pressure of the lab calendar apparatus and the pressure applied to the paper was determined by the following method. The pressure-sensitive paper “Prescale” (manufactured by FUJIFILM Corporation) was passed through a lab calendar apparatus while changing the linear pressure under the above conditions, and the pressure was determined from the degree of color development of the thermal paper at that time. When the linear pressure is less than 100 kg / cm, medium pressure is used, and when the linear pressure is 100 kg / cm or more, high pressure is used. As a result, the pressure was 9 MPa at a linear pressure of 21 kg / cm, the pressure was 25 MPa at a linear pressure of 42 kg / cm, the pressure was 49 MPa at a linear pressure of 200 kg / cm, the pressure was 56 MPa at a linear pressure of 250 kg / cm, and the pressure was 80 MPa at a linear pressure of 500 kg / cm. .

<Evaluation>
About the coated paper obtained in Examples 1-3 and Comparative Examples 1-5, the white paper glossiness of both the front and back was measured according to JIS-P8142, and the average value was calculated | required. The results are shown in Table 1.

  From the comparison of the examples and comparative examples in Table 1, it is confirmed that the coated paper with higher glossiness is obtained by the method of the present invention in which the moisture content of the uncoated base paper and the coating thickness are in a predetermined range. Recognize.

Claims (3)

A method for producing a coated paper comprising: a coating step of applying a coating liquid containing at least a pigment to uncoated base paper to obtain a pre-calendar coated paper; and a calendar step of calendering the pre-calendar coated paper Because
The coating step is a step of applying a coating liquid to an uncoated base paper having a water content of 4% by weight or less, and the coating amount of the coating liquid (in terms of solid content) is about one side of the uncoated base paper 10.5 g / m ² or more,
Manufacturing method of coated paper.   The method for producing coated paper according to claim 1, wherein the coating liquid contains an inorganic pigment as a pigment and has a solid content concentration of 30% by weight or more.   The manufacturing method of the coated paper of Claim 1 or 2 whose Beck smoothness by JIS-P8119 of the said uncoated base paper is 5 to 100 second.