JPH1046495A - Coated paper for printing and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coated paper for printing, excellent in dimensional stability and blister resistance, comprising a specific wt.% based on the whole pulp amount of a pulp which is treated with an enzyme having xylan decomposing activity but not filter paper decomposing activity and then bleached by a multi- stage method. SOLUTION: A pulp comprising 60-100wt.% based on the absolute dry weight of the whole pulp of a bleached pulp which is obtained by treating a pulp with an enzyme having xylan decomposing activity but not filter paper decomposing activity and bleaching the treated pulp by a multi-stage method is made into a base paper by using a gap former paper machine. The base paper is coated with a coating solution consisting essentially of a pigment such as ground calcium carbonate or kaolin and an adhesive such as a styrene/butadiene copolymer latex by a blade coater, etc., to give the objective coated paper for printing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a coated paper for printing and a method for producing the same. More specifically, the present invention relates to a method for producing a coated printing paper having high dimensional stability and excellent blister resistance at high speed.

[0002]

2. Description of the Related Art In recent years, the importance of printed matter as a medium for publishing, advertising, advertising, and the like has been re-recognized, and the demand for coated printing paper as a base material has been increasing. On the other hand, quality requirements for coated paper for printing for visualization and colorization of printed matter are increasing year by year. In order to cope with such a situation, it is necessary to realize both high-speed papermaking and high quality printing coated paper, but these two requirements are met in papermaking of printing coated paper. Compatibility has been considered difficult.

[0003] As the papermaking speed is increased, the dewatering ability of the papermaking machine is enhanced. When the basepaper is manufactured by such a papermaking machine, the fine fibers in the base paper are unevenly distributed on the surface layer, and the interlayer strength of the base paper is reduced. It tends to be weak. When printing coated paper is manufactured using this as a base paper, "blister"
, The coating layer is liable to cause a printing failure in which the coating layer swells, which may be a serious defective product. Generally, in order to solve this kind of problem, a method of improving or improving the interlayer strength of a base paper by adding or adding a paper strength enhancer, particularly a cationized starch, in a papermaking process of the base paper is used. However, when the addition amount of such a paper strength enhancer is added internally, although the interlayer strength of the base paper is improved,
There is a problem that blisters are liable to occur in some cases due to a decrease in air permeability.

[0004] Further, when the paper strength enhancer is externally added, since the fine fibers are localized in the surface layer of the base paper as described above, the paper strength enhancer does not penetrate into the base paper. It was not an effective measure to prevent blisters. On the other hand, when the interlaminar strength of the base paper is improved by increasing the degree of pulp beating to increase the fiber-to-fiber bonding strength, the blister resistance is improved, but the dimensional stability of the base paper is deteriorated. There was a problem that the operability deteriorated due to the decrease in pulp freeness.

In recent years, many techniques have been proposed for modifying enzymes by acting on lignocellulosic materials and fibers obtained by processing lignocellulose. For example, Japanese Patent Publication No. 2-20756, JP-A-1-9249.
No. 0, Japanese Patent Publication No. 3-4672, Japanese Patent Laid-Open No. 6-16
6978, JP-A-6-316899, JP-A-7-279078, JP-A-7-331588 and the like for the purpose of improving beating properties and modifying pulp fibers. A method of adding cellulase to pulp fibers before beating, JP-A-2-6681, JP-A-2-229291, JP-A-3-1244891.
In order to improve the drainage on a wire as disclosed in Japanese Patent Application Laid-Open Publication No. H10-163, there is a method in which an enzyme such as cellulase or hemicellulase is added to the stock after beating and adding a chemical. In addition, Japanese Patent Application Laid-Open Nos.
293486, JP-A-6-101185,
As disclosed in JP-A-6-207390 and the like, a method of improving bleachability by treating pulp fibers with an enzyme such as cellulase or hemicellulase before bleaching is also known. JP-A-8-49187 discloses that the pulp is treated with an enzyme to improve the blister resistance and the break resistance of the coated paper for offset printing.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have conducted various studies on pulp enzymatic treatment for a method for producing a printing coated paper excellent in blister resistance and dimensional stability at high speed. However, it has been found that there is a problem that the dimensional stability of the coated paper for offset printing is deteriorated depending on the type of the enzyme used for the pulp treatment. Therefore, the present inventors examined the enzyme treatment of pulp in more detail.By treating the pulp with an enzyme having no filter paper decomposing activity, the blister resistance was improved without adversely affecting the dimensional stability of the base paper. I found that it can be improved. Further, if the pulp before multi-stage bleaching is treated with an enzyme having xylan-decomposing activity without filter paper-decomposing activity and then multi-stage bleaching, the bleaching chemicals required for bleaching to the desired whiteness can be reduced. It has been found that the damage of the pulp fiber can be suppressed to a minimum, and as a result, the dimensional stability of the base paper is improved, leading to the present invention. It is an object of the present invention to provide blister resistance and dimensional stability by using a bleached pulp that has no filter paper decomposing activity and is treated with an enzyme having xylan decomposing activity and then multi-bleached for base paper. To produce coated printing paper at high speed.

[0007]

SUMMARY OF THE INVENTION The first aspect of the present invention is to provide a coated paper for printing in which a base paper is provided with a coating layer containing a pigment and an adhesive as a main component. A coated paper for printing, characterized by using at least one kind of bleached pulp which has not been subjected to a treatment with an enzyme having xylan-decomposing activity and then is multi-bleached.

A second aspect of the present invention is the printing method according to claim 1, wherein the bleached pulp is contained in the pulp constituting the base paper in an amount of 60 to 100% by weight based on the absolute dry weight of all the pulp constituting the base paper. Coated paper and a method for producing the same. A third aspect of the present invention is a coated paper for printing according to claims 1 and 2, wherein the base paper is made using a gap former paper machine, and a method for producing the same.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The raw material of the pulp used in the present invention can be selected from hardwood, softwood, and non-wood, but a good formation is desired for the base paper of the coated paper for printing. Therefore, hardwoods that can obtain pulp having a short fiber length and a small fiber width are preferably used.

As the pulp cooking method used in the present invention, known cooking methods such as kraft cooking, sulfite cooking, polysulfide cooking, and soda cooking can be used, but pulp quality, energy efficiency and the like are taken into consideration. If so, kraft cooking and polysulfide cooking are preferably used. The degree of sulfidation of the cooking liquor is 5 to 75%, preferably 5 to 50%, and the effective alkali addition rate is in the range of 5 to 30% by weight, preferably 10 to 25% by weight, based on the weight of the dried wood.

In the cooking, a known cyclic keto compound such as benzoquinone,
Naphthoquinone, anthraquinone, anthrone, phenanthroquinone and alkyl-substituted products such as alkyl and amino of the quinone-based compound, or hydroquinone-based compounds such as anthrahydroquinone which is a reduced form of the quinone-based compound, and further anthraquinone by the Diels-Alder method A stable compound obtained as an intermediate in the synthesis method,
One or more selected from 10-diketohydroanthracene compounds and the like can be added. In this case, the addition rate is 0.001-1.
0% by weight.

The unbleached pulp obtained by the known digestion method is subjected to washing, roughing and fine-selection steps, and before being subjected to multi-stage bleaching, treated with an enzyme having no filter paper-decomposing activity and having xylan-decomposing activity. . However, in consideration of the optimum pH and the optimum temperature of the enzyme, it is preferable to carry out the enzyme treatment after the unbleached pulp is subjected to oxygen delignification. The enzyme used in the present invention is an enzyme having poor filter paper decomposition activity and having xylan decomposition activity. As long as the enzyme does not have the filter paper decomposing activity and has the xylan decomposing activity, there is no particular problem even if it has the decomposing activity of mannan, pectinan and the like. However, if the filter paper has a filter paper decomposing activity, the dimensional stability of the base paper may be deteriorated, which is not suitable.

When pulp is treated with an enzyme having no xylan-decomposing activity without filter paper-decomposing activity, xylan ubiquitously present on the pulp surface or in pulp fibers is selectively decomposed, and the pulp retains a cellulose skeleton. Since it becomes porous as it is, when such pulp is used for base paper,
It is thought that the blister resistance is improved because the permeability of the paper strength enhancer is improved and the interlayer strength of the base paper is improved, and the air permeability of the base paper is also improved. On the other hand, cellulose, which is the main skeleton of pulp, is hardly affected by the enzyme treatment, and thus the dimensional stability of the base paper is maintained.

The enzyme used in the present invention is collected by culturing microorganisms, cells, bacteria, and the like that produce the enzyme. Furthermore, these mutants or strains produced by genetic engineering to increase the production of enzymes, ie, recombinant strains, may be collected. Further, the enzyme may be as produced in a culture solution, or may be a concentrated mixture thereof, or a product prepared from a dried preparation thereof. The enzyme has a xylan-decomposing activity of 0.1 to 10 U / g of absolutely dried pulp, preferably 0.1 to 10 U / g.
It is added to the pulp in the range of 5 to 5 U / g of absolutely dry pulp. Here, 1 U means the amount of enzyme that produces 1 μmol xylose per minute when the enzyme is allowed to act on xylan. When the amount of the enzyme added is less than 0.1 U / g of absolutely dried pulp as xylan-decomposing activity, the effect is insufficient due to insufficient elution of xylan from the pulp.
If the absolute pulp exceeds g, the yield of the pulp in the enzyme treatment step is reduced, and the cost is increased, which is not economical.

The enzyme treatment is carried out at a pulp concentration of 1 to 20% by weight, preferably 2 to 15% by weight. If the pulp concentration is less than 1% by weight, the treatment requires a large-capacity facility and is not suitable. When the pulp concentration exceeds 20% by weight,
Since it is difficult to mix the pulp and the enzyme uniformly, the effect of the enzyme treatment cannot be sufficiently obtained. The uniform mixing of the enzyme and the pulp in the water-containing state is appropriately selected and performed depending on the pulp concentration during the middle treatment such as a low-concentration mixer, a medium-concentration mixer, a static mixer, or a high-concentration mixer.

The temperature at which the pulp is treated with the enzyme is 30 to
80 ° C, preferably in the range of 40-60 ° C. If the temperature is lower than 30 ° C., the xylan decomposition activity of the enzyme is reduced and the treatment effect is insufficient, and such a low temperature is obtained by cooling the high temperature pulp after digestion or after oxygen delignification. It must be heated to the temperature of the first bleaching stage of the subsequent multi-stage bleaching, which wastes energy and is not a viable option. On the other hand, if the temperature is higher than 80 ° C., it is not suitable for a normal enzyme because the enzyme itself is denatured and becomes inactive.

The pH of the pulp solution or the solution contained in the pulp during the treatment is in the range of 3 to 10, preferably 5 to 9. When the pH needs to be adjusted, the pH is adjusted by adding an arbitrary acidic solution or alkaline solution. It goes without saying that the solution used for adjusting the pH can use wastewater containing no active chlorine generated in the multi-stage bleaching step. The pH can also be adjusted by blowing exhaust gas such as carbon dioxide into the pulp slurry. The processing time is 10 minutes or more, preferably 30 to 180 minutes.
The time is not particularly limited. As described above, the enzyme treatment is performed after cooking or after washing after the oxygen delignification step. However, this enzymatic treatment may be repeated a plurality of times during the subsequent multi-stage bleaching or at the final stage of the multi-stage bleaching without impairing the object of the present invention.

The multi-stage bleaching step used in the present invention comprises chlorine (C), caustic soda (E), hypochlorite (H), chlorine dioxide (D), oxygen (O), hydrogen peroxide (P), A known bleaching sequence using a known bleaching chemical such as ozone (Z), organic peracid, etc., for example, CEHD, C / D-Eo-
HD, D-Eop-D, DED, etc. are used in appropriate combination, but the effects of the present invention are not particularly affected by the combination of bleaching chemicals in the multi-stage bleaching step.
There is no particular limitation.

In order to activate the object of the present invention, it is necessary that the pulp treated as described above accounts for at least 60% by weight or more of the total pulp constituting the coated paper. If the amount is less than 60% by weight, the pulp fiber will not have sufficient modifying effect, and will not have sufficient effect. Other pulp constituting the base paper includes bleached kraft pulp, mechanical pulp, deinked pulp, etc., which have not been subjected to the treatment described in the present invention, and are used in an appropriate combination as long as the effects of the present invention are not impaired. You.

The enzyme-treated pulp is used alone or mixed with other pulp and beaten by a beater such as a single disc refiner, a double disc refiner, or a beater. In consideration of the quality, strength, or operability of the coated paper for printing, the enzyme treatment was performed by beating so that the value indicated by the Canadian standard freeness was in the range of 550 to 300 ml. It is preferred to use pulp.

The pulp treated with the enzyme and beaten is subjected to papermaking by a known papermaking machine, but the papermaking conditions are not particularly limited. However, in consideration of high speed papermaking, a paper machine having a gap former is preferably used. In addition to fillers such as talc, kaolin, heavy calcium carbonate, and light calcium carbonate, various commonly used anionic, nonionic, cationic or amphoteric retention improvers, drainage improvers, and paper strength enhancement An internal additive for papermaking, such as an agent or an internal sizing agent, is used as needed. Further, a dye, a fluorescent whitening agent, a pH adjuster, an antifoaming agent, a pitch control agent, a slime control agent and the like are added as required.

The base paper thus obtained is applied to a natural adhesive such as starch or PVA by various size presses or roll coaters.
It is of course possible to perform sizing using a synthetic adhesive such as, but in consideration of speeding up the production speed, use a film metaling type size press to increase the solid concentration of the glue. A method of performing a size press process is preferably used. In addition, it is of course possible to perform preliminary coating with a roll coater, a blade coater, or the like.

Examples of the pigment which is one of the main components of the coating composition used in the present invention include clay, kaolin, aluminum hydroxide, calcium carbonate, titanium dioxide, barium sulfate, zinc oxide, satin white, and sulfuric acid. One or more of common general-purpose pigments such as calcium, talc and plastic pigment can be arbitrarily selected and blended.

As the adhesive, for example, styrene-
Conjugated diene copolymer latex such as butadiene copolymer, methyl methacrylate-butadiene copolymer, acrylic polymer latex such as acrylate and / or methacrylate polymer or copolymer, ethylene-acetic acid Vinyl-based polymer latex such as vinyl copolymer, or these various polymer latexes,
An alkali partially soluble or alkali insoluble polymer latex modified with a functional group-containing monomer such as a carboxyl group can be used.

Examples of the water-soluble adhesive used in combination with the synthetic adhesive include starch such as cationized starch, oxidized starch, enzyme-modified starch, thermochemically-modified starch, etherified starch, esterified starch, and cold-water-soluble starch. , Carboxymethylcellulose, celluloses such as hydroxymethylcellulose,
Water-soluble synthetic adhesives such as polyvinyl alcohol and olefin-maleic anhydride resin can be arbitrarily selected and used. These pigments and adhesives include dispersants,
Various additives such as a waterproofing agent, a fluidity modifying agent, a coloring agent, and a fluorescent whitening agent can be added as needed.

The coating of the coating layer is performed by using a coating apparatus used in the production of general coated paper, for example, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a bar coater, a curtain coater, a die slot coater, One- or two-sided coating is performed on one or both sides of the base paper by an on-machine or off-machine coater provided with a coating device such as a gravure coater, a Chambers coater, or a size press coater. The solid concentration of the coating composition at that time is generally about 40 to 75% by weight, but preferably 45 to 70% by weight in consideration of operability. In addition, the calendering method may be any of a variety of calenders such as a super calender, a gloss calender, a soft compact calender, or a metal or a drum and an elastic roll. .

[0027]

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to these examples. % In the following Examples and Comparative Examples indicates% by weight unless otherwise specified. Example 1 (Manufacture of pulp) A mixed hardwood chip composed of 70% of domestic hardwood chips and 30% of eucalyptus wood was used as a raw material to obtain a kappa number of 20.1 and a pulp viscosity of 41.
An unbleached pulp of 0 cps was obtained. Next, oxygen delignification was performed to obtain a kappa number of 9.6 and a pulp viscosity of 25.1 cp.
s of oxygen delignified pulp was obtained. The pulp after the oxygen delignification treatment is washed with one stage of a diffusion washer and one stage of a drum washer, the pulp concentration after the washing is adjusted to 10%, and the pH is adjusted to 8.0 by adding dilute sulfuric acid. After adding 2 U / g of absolutely dry pulp having no xylan-decomposing activity (trade name: Pulpzyme HC, manufactured by Novo Nordisk), the mixture was treated at 60 ° C. for 90 minutes. Further, the pulp after the enzyme treatment is C-
In the EHD bleaching sequence, multi-stage bleaching was performed under the conditions shown in Table 1, washed, and hardwood bleached kraft pulp having a Hunter brightness of 85.2% was produced and stored in a high concentration storage tank.

[0028]

[Table 1]

(Production of base paper for coating) A pulp slurry having a concentration of 4% composed of 100% bleached hardwood kraft pulp was beaten using a double disc refiner to a Canadian standard freeness of 500 ml. Talc was added as a filler to the beaten pulp slurry so that the paper ash content was 9%, and a rosin sizing agent (trade name: Size Vine E, manufactured by Arakawa Chemical Co.) was added as an internal sizing agent. A paper stock was prepared by adding 2% of aluminum sulfate to the weight of the absolutely dried pulp, and the stock was used to prepare a paper stock at a speed of 110 mm.
The paper was made at 0 m / min, and 2 g / m ² of a 5% -concentrated oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) was applied and dried using a two-roll size press, and dried. and producing printed coated paper base paper for the m ^2.

(Preparation of coating liquid) 25% of heavy calcium carbonate (trade name: FMT-90 / manufactured by FIMATECH) and kaolin (trade name: Amazon 88 / manufactured by CADAM) 75
% Of the pigment was dispersed using a CORES disperser to obtain a pigment slurry having a solid content of 72%. A styrene-butadiene copolymer latex (trade name: SN)
307, manufactured by Sumitomo Dow) in solid content per pigment weight of 10
%, Oxidized starch (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) at a solid content of 4%, and other auxiliaries were added and dispersed to prepare a coating solution having a solid content concentration of 58%.

(Manufacture of Coated Paper) Both sides of the base paper for printing coated paper were coated with the above coating liquid using a blade coater so as to have a surface of 18 g / m ² . A nip pressure of 200 kg / c was applied to an off-machine super calender comprising six coated metal sheets and six cotton rolls.
m, the Oken-type smoothness is 1100 seconds in the front and 1120 seconds in the back
A second coated paper for offset printing was produced.

In order to evaluate the quality, the following test method was used to measure and evaluate the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance. . Table 4 shows the results.

(1) Measurement of Single Fiber Strength In accordance with TAPPI standard T231cm-85, the zero-subban breaking length of pulp fibers was measured and used as an index of single fiber strength. (2) Measurement of moisture expansion / contraction ratio A coated paper sample having a width of 30 mm was gripped under the condition of a relative humidity of 65%, fixed at an interval of 100 mm, and the relative humidity was changed from 65% to 20% to 80% under a load of 5 g. 65%, this was repeated three times, the dimensional change and the change in water content at that time were measured, the dimensional change rate and the water change rate were calculated from the measured values, and the moisture expansion / contraction rate was calculated from the following equation (1). I asked. The dimensional change is measured by a differential transformer displacement meter (trade name: MDE-
2, manufactured by Shinko Electronics Co., Ltd.) with an accuracy of 0.01 mm, and the change in moisture was measured with an electronic balance with an accuracy of 0.001 g. Moisture expansion / contraction rate = dimensional change rate (%) / moisture change rate (%) (1)

(3) Blister Resistance Measurement 1 ml of the ink for rotary offset printing is developed with an RI printing machine (manufactured by Meiji Seisakusho) and printed on both sides of a coated paper sample.
Soak the printed sample in heated silicone oil,
The appearance of the generated blisters was visually observed and evaluated according to the following evaluation criteria. Evaluation criteria ・ ・ ・: Almost no blistering was observed. 〇: Extremely mild blistering is observed,
Not a problem in practice. Δ: Blisters are observed and cannot be used practically. X: Severe blister generation was observed, and it could not be used practically.

Example 2 The same operation as in Example 1 was carried out except that the amount of the enzyme added was changed so that the xylan-decomposing activity of 0.5 U per gram of pulp worked, and the bleaching conditions were changed as shown in Table 2. Was. Table 4 shows the results of measuring the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance.

[0036]

[Table 2]

Comparative Example 1 The same operation as in Example 1 was performed except that the enzyme treatment was not performed and the bleaching conditions were changed as shown in Table 3. Table 4 shows the results of measuring the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance.

[0038]

[Table 3]

Comparative Example 2 The same operation as in Example 1 was performed, except that the enzyme was replaced with an enzyme having a filter paper decomposing activity (trade name: Cellulizer, manufactured by Nagase Biochemical Co., Ltd.). Table 4 shows the results of measuring the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance.

Example 3 Speed 1300 m on a paper machine having a gap former
The same operation as in Example 1 was performed except that papermaking was performed at / min.
Table 4 shows the results of measuring the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance.

Comparative Example 3 Speed 1300 m on a paper machine having a gap former
The same operation as in Comparative Example 1 was performed except that papermaking was performed at / min.
Table 4 shows the results of measuring the single fiber strength of the obtained enzyme-treated hardwood bleached kraft pulp, the moisture expansion / contraction ratio of the coated paper for offset printing, and the blister resistance.

Example 4 A paper stock containing a mixture of 65% of the enzyme-treated bleached hardwood kraft pulp prepared in Example 1 and 35% of the enzyme-untreated hardwood bleached kraft pulp prepared in Comparative Example 1 was used as base paper. The same operation as in Example 1 was performed except that the product was used for the production of Table 4 shows the measurement results of the moisture expansion and contraction rate and the blister resistance of the obtained coated paper for offset printing.

COMPARATIVE EXAMPLE 4 A stock containing a mixture of 45% of the enzyme-treated bleached hardwood kraft pulp prepared in Example 1 and 55% of the enzyme-untreated hardwood bleached kraft pulp prepared in Comparative Example 1 was used as base paper. The same operation as in Example 1 was performed except that the product was used for the production of Table 4 shows the measurement results of the moisture expansion and contraction rate and the blister resistance of the obtained coated paper for offset printing.

[0044]

[Table 4]

[0045]

As is clear from Table 4, the pulp before bleaching is treated with an enzyme having xylan-decomposing activity without filter paper-decomposing activity and then using at least one bleached pulp obtained by multi-stage bleaching. It can be seen that coated printing paper having high dimensional stability and excellent blister resistance can be manufactured at high speed.

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[Procedure amendment]

[Submission date] August 23, 1996

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

In order to achieve the object of the present invention, it is necessary that the pulp treated as described above accounts for at least 60% by weight or more of the total pulp constituting the coated paper. If the amount is less than 60% by weight, the pulp fiber will not have sufficient modifying effect, and will not have sufficient effect. Other pulp constituting the base paper includes bleached kraft pulp, mechanical pulp, deinked pulp, etc., which have not been subjected to the treatment described in the present invention, and are used in an appropriate combination as long as the effects of the present invention are not impaired. You.

Claims (3)

[Claims] In a coated paper for printing having a base paper provided with a coating layer mainly composed of a pigment and an adhesive, the pulp constituting the base paper has no filter paper decomposing activity and has xylan decomposing activity. A coated paper for printing, characterized by using at least one bleached pulp which has been subjected to the following treatment and then multi-bleached. 2. The bleached pulp is used as the pulp constituting the base paper in an amount of 60% per the absolute dry weight of all the pulp constituting the base paper.
The coated paper for printing according to claim 1, wherein the content of the coated paper is from 100 to 100% by weight. 3. The method for producing a coated paper for printing according to claim 1, wherein the base paper is formed using a gap former paper machine.