JP4847376B2 - Method for producing coated paper for offset printing and coated paper - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for producing a coated coated paper, and more particularly to a method for producing a coated paper for offset printing using a base paper produced by a paper machine that combines a gap former and a shoe press, and the coating thereof. The present invention relates to a paper, and relates to a technique for producing a coated paper excellent in appearance without occurrence of a wavy phenomenon such as a wrinkle on a white paper or printed matter.

  In recent years, coupled with the labor-saving trend, demands for higher speed and larger paper machines are increasing. And in the latest paper machine, operation with a paper making speed of 1000 m / min or more is common. An on-machine manufacturing facility in which a papermaking part, a coating part, and a finishing part are integrated is also common.

  By the way, in making a shift to such high speed and large size, the change of the paper making method, particularly the wire part and press part of the paper machine, greatly contributes.

  That is, as a paper machine equipped with a wire part, a so-called long-mesh paper machine that is mainly used in the past and performs dewatering through a long mesh (paper-making wire) only in the upper part and freely in the lower part, and then a long-mesh machine. A top wire that forms a loop is placed above the second half of the long net, and the so-called on-top former type or hybrid former type paper machine using twin wire, in which dewatering is performed at the top and bottom, It has been put into practical use. In particular, the development of this twin wire is one factor that has made it possible to increase the speed of paper machines.

  However, even in the case of a hybrid former type paper machine, if the speed is further increased, the first half of the top wire, the part corresponding to the so-called conventional long net part, the initial dewatering part having a relatively low pulp concentration. As a result, there was a problem that the resulting paper was extremely inferior and the product value was lowered.

  Therefore, the dewatering zone consisting of the top wire in the hybrid former type paper machine was devised to be the same size as the bottom wire portion in the lower part, that is, the dewatering mechanism from the lower side was almost the same as the conventional long net type. It is a so-called gap-forth structure in which the stock discharged from the inlet flows between two wires (upper and lower) from the beginning, and dehydration is promoted to both sides (outside) of the wires. It is a paper machine that uses a twin wire dewatering mechanism, called a mer type paper machine.

  In this gap former type paper machine, by supplying the paper material discharged from the inlet to the gap (wedge-shaped opening) formed by the top wire and the bottom wire, 2 A dehydrated paper layer is formed in the state of being sandwiched between sheets (upper and lower) of wire, so a uniform paper layer can be formed without inducing material disturbance as in the case of the hybrid former type paper machine. It is highly appreciated that it can.

  Also, in the press part, a shoe press is introduced as a measure for speeding up. The shoe press is used to dehydrate the wet paper and is usually used in two units, but the first unit is often used as a felt-felt combination and the second unit is used as a felt-belt combination. This contributes to improved dewatering efficiency at high speed, running stability at high speed, and excellent moisture profile of the final product.

  However, paper is made with a paper machine that combines this gap former and shoe press, and then a coating liquid (aqueous coating composition) is applied using a base paper coated with an adhesive by a film metering size press. In the case of being dried and finished in a coated paper for offset printing (hereinafter referred to as “off-wheel”), there is a problem that blisters are likely to occur during off-wheel printing.

  At the same time, the base paper produced by the gap former type paper machine is discharged from the inlet and then dehydrated and a paper layer is formed by the two top wires and the bottom wire, so that the aspect ratio of the paper is large. Then, in the production of coated paper, when an aqueous liquid is applied by a film metering size press apparatus or a coating liquid (aqueous coating composition) is applied by a blade coating machine, Stretching in the width direction of the paper is significantly caused by pulling of the paper such as absorption, drying, and drawing, and there is also a problem that a wavy phenomenon such as wrinkles is likely to occur on the paper surface of the white paper or the off-ring printed matter. The wavy phenomenon such as wrinkles is more prominent as the base paper basis weight is smaller.

  Here, the blister is when the moisture in the coated paper is vaporized by rapid heating in the process of printing and heat drying on a double-sided coated paper on an off-wheel printer, This is a delamination phenomenon that occurs by causing cracks or the like inside the paper layer by the water vapor pressure. And blisters significantly reduce product value. In addition, wrinkles refer to wrinkles that occur along the paper flow direction when high-density images are printed on both sides by off-ring printing.

  Various proposals have been made in order to improve the defects inherent to the base paper obtained with such a gap former type paper machine. For example, an aqueous liquid having a solid content concentration of 2 to 12% by weight, mainly composed of an adhesive, is applied to a base paper produced by a gap former type paper machine and dried using a film metalling type size press. There is a proposal of a base paper (see, for example, Patent Document 1).

Japanese Patent No. 3744115

  According to this method described in Patent Document 1, blisters are eliminated to some extent. However, it has not been possible to solve the other problem, ie, a phenomenon in which a wavy phenomenon such as a wrinkle occurs on the surface of white paper or printed paper.

  Therefore, the object of the present invention is to suppress wavy phenomenon such as wrinkles after the drying process of the coated paper made by a paper machine combining a gap former and a shoe press, and to improve blister resistance during off-wheel printing. It is to provide a coated paper which also has.

In order to solve the above-mentioned problems, the present inventors can suppress the generation of blisters and wrinkles by applying and drying an aqueous liquid mainly composed of an adhesive having a solid content of 13 to 20% by mass on a base paper. The present invention was completed. That is, the method for producing a coated paper for offset printing according to the present invention is a method for producing a coated paper for offset printing in which an aqueous coating composition mainly composed of a pigment and an adhesive is coated on a base paper and dried. In the method, as the base paper, on a paper sheet made by a paper machine combining a gap former and a shoe press, using a film metalizing size press apparatus, starch as a main ingredient and adhesive solid content concentration Is an aqueous liquid having a viscosity of 13 to 20% by mass, a solid content concentration of 20% by mass, a temperature of 50 ° C., and a B-type viscosity of 60 rpm . Using a base paper that has been applied and dried at a dry coating amount of 0 g / m ² , and the base paper is smoothed by a calendar facility in a step before being coated and dried by a blade coating machine. It is characterized by that.

The viscosity of the aqueous liquid containing the adhesive as a main component is set in such a range as follows: 1. An aqueous liquid containing an adhesive as a main component and having a solid content concentration of 13 to 20% by mass is dry coated on both sides. It is because it is suitable to apply 0-3.0 g / m ² .

Wherein to a dry coating amount of the aqueous solution mainly composed of an adhesive in such a range is because it further suppress the occurrence of blisters.

Coated in blade coating machine, in front of the step to be dried, to smooth the sheet by calendering equipment, because it is possible to further suppress the occurrence of Hijiwa after offset printing.

  In the method for producing a coated paper for offset printing according to the present invention, the aqueous coating composition is a coating liquid having a solid content concentration of 65% by mass or more, and the base paper is coated with the aqueous coating composition. It is preferable to be dried. It can reduce the amount of water that is thought to promote hydrangea.

In the manufacturing method of the coated paper for offset printing which concerns on this invention, it is preferable that the basic weight of the said base paper is 35-70 g / m < ² >.

  In the method for producing a coated paper for offset printing according to the present invention, an on-machine production facility in which a base paper making process using paper making, a coating process of an aqueous coating composition on the base paper, and a finishing process are integrated. Preferably it is manufactured.

  The coated paper for offset printing according to the present invention is manufactured by the method for producing a coated paper for offset printing according to the present invention.

  According to the method for producing a coated paper for offset printing of the present invention, undulation phenomena such as wrinkles after the drying process of the coated paper produced by a paper machine combining a gap former and a shoe press are suppressed, and A coated paper having blister resistance at the time of off-wheel printing can be obtained.

  The method for producing a coated paper for offset printing according to the present embodiment is a method for producing a coated paper for offset printing in which an aqueous coating composition mainly composed of a pigment and an adhesive is coated on a base paper and dried. In this case, as the base paper, a sheet metal made by a paper machine combining a gap former and a shoe press is used, and a film metalling size press apparatus is used, and an adhesive is a main component and an adhesive solid content concentration is 13 to 13. A base paper formed by applying and drying a 20% by mass aqueous liquid is used.

[Action]
An aqueous liquid containing an adhesive as a main component and having an adhesive solid content concentration of 13 to 20% by mass is dry-dried at 1.0 to 3.0 g / m ² on both sides by a film metalizing size press on a paper web, preferably 1 Apply at 5 to 2.5 g / m ² , dry and finish as a base paper. This base paper may be smoothed by calendaring before blade coating. Occurrence of wrinkles after off-wheel printing can be further suppressed.

Thereafter, in the coating step of forming a single coating layer on the base paper, 60 to 100 parts by mass of heavy calcium carbonate having an average particle size of 0.8 to 1.2 μm is used, and the solid content is 65% by mass or more, preferably Is 70 to 90% by weight aqueous coating composition, and when coated on both sides so that the coating amount on one side is 8 to 13 g / m ² , preferably 9 to 12 g / m ² , It is possible to provide a coated paper with excellent appearance that does not have a wavy phenomenon such as later wrinkles.

  When applying an aqueous liquid mainly composed of an adhesive to a paper sheet using a film metalizing size press, an aqueous liquid having an adhesive solid content concentration of 13 to 20% by mass, preferably 15 to 18% by mass was applied. It is important to coat the base paper with an aqueous coating composition having a solid content concentration of 65% by mass or more with a blade coating machine. If necessary, substances other than pigments and adhesive components can be blended in the aqueous liquid. At that time, the solid content concentration of the aqueous liquid increases, but the solid content concentration of the adhesive needs to be in the range of 13 to 20% by mass.

  In general, using a film metering size press machine, applying an aqueous liquid mainly composed of an adhesive, and improving the internal bond strength of the base paper may have an effect on the blister properties during off-wheel printing. Are known.

However, when a gap former is combined with a shoe press, a phenomenon called wrinkles that rippled on the white paper surface occurs when the adhesive is applied with a film metering size press device, which is inconspicuous on the white paper surface before printing. There is a phenomenon that becomes apparent when off-wheel printing is applied. In order to suppress the occurrence of blisters while suppressing the phenomenon of wrinkles, an aqueous liquid having a solid content concentration of 13 to 20% by mass containing an adhesive as a main component is 1.0 to 3. It is optimal to apply 0 g / m ² . When the solid content concentration of the aqueous liquid containing an adhesive as a main component exceeds 20% by mass, it becomes difficult to control the coating amount, leading to destabilization of paper separation. In particular, these phenomena become conspicuous when applied at a high speed, and there is a possibility of causing uneven coating. On the other hand, when using a film metering size press on a paper web and applying and drying an aqueous liquid having a solid content concentration of less than 13% by mass of an aqueous liquid mainly composed of an adhesive, a wavy phenomenon such as wrinkles may occur. There are problems, such as occurring. This is because when an aqueous liquid with a low solid content concentration is applied to a paper base made with a gap former with a large aspect ratio of the paper with a film metering size press device, the aqueous liquid penetrates and expands and contracts in the width direction of the paper. As a result, it is presumed that a wavy phenomenon such as a wrinkle occurs. Further, the waviness phenomenon such as wrinkles is more prominent as the base paper basis weight is smaller.

When the dry coating amount of an aqueous liquid having a solid content concentration of 13 to 20% by mass with an adhesive as the main component exceeds 3.0 g / m ² on both sides, the air permeability of the coated paper increases and blister resistance May lead to a decline in sex. On the other hand, when the dry coating amount of the aqueous liquid is less than 1.0 g / m ^{2 on} both sides, the internal bond strength is lowered, and the generation of blisters may not be suppressed.

In order to apply an aqueous liquid having a solid content concentration of 13 to 20% by mass based on an adhesive as a dry coating amount on both sides of 1.0 to 3.0 g / m ² , a solid content concentration of 20% by mass, temperature A starch having a measured value at 50 ° C. with a B-type viscometer of 60 rpm is 100 mPa · s or less, preferably 30 to 80 mPa · s is suitable.

  Furthermore, from the viewpoint of reducing the water content of the aqueous coating composition, which is considered to promote the generation of wrinkles, by setting the solid content concentration of the aqueous coating composition that is the coating liquid in the blade coating machine to 65% by mass or more. is important. It is desired to use a large amount of heavy calcium carbonate with good fluidity at high speed to increase the solid content concentration of the aqueous coating composition.

  Thus, it is a coated paper that has been made, coated, and finished by a paper machine that combines a gap former and a shoe press, has no wavy phenomenon such as wrinkles on the white paper surface, and has blister resistance during off-wheel printing, In addition, it is possible to obtain a coated paper free from the occurrence of waviness such as wrinkles.

  Hereinafter, preferred embodiments of the method for producing offset-coated coated paper according to the present invention will be described in detail.

The coated base paper used in the present invention is made of chemical pulp such as hardwood bleached kraft pulp, softwood bleached kraft pulp, mechanical pulp such as GP and TMP, and pulp derived from waste paper as a raw material, and a known gap former and shoe press Using a paper machine with a combination of, the paper is made with a gap former having a mechanism of dehydrating action with two wires, and then dehydrated with one or two shoe presses. The coated base paper includes acid paper and neutral paper. It is preferable to make a base paper so that the basis weight is 35 to 70 g / m ² , preferably 40 to 65 g / m ² . If the basis weight of the base paper is less than 35 g / m ² , papermaking at high speed becomes difficult. On the other hand, if the basis weight of the base paper exceeds 70 g / m ² , generation of wrinkles may be lost. In coated base paper, paper strength enhancers such as cationic starch and polyacrylamide, sizing agents such as rosin size, alkenyl succinic anhydride, alkyl ketene dimer, synthetic sizing agent, talc, calcium carbonate, synthetic zeolite, titanium, etc. And a paper making aid such as a yield improver such as colloidal silica, polyacrylamide, and polyethylene oxide, and a filtering agent.

  The wet paper dehydrated in the press part is transferred to the pre-dryer part and dried. For the pre-dryer part, a single deck dryer without an open draw is usually used.

  After the pre-dryer, an aqueous liquid mainly composed of an adhesive such as starch is applied and dried with a film metalizing size press.

  Examples of the adhesive contained in the aqueous liquid used in the film metering size press include thermochemically modified starch, carbamic acid starch, oxidized starch, and esterified starch. If necessary, substances other than pigments and adhesive components can be blended.

  Examples of pigments for aqueous coating compositions for printing coated paper used in blade coating machines include kaolin, light calcium carbonate, heavy calcium carbonate, satin white, titanium oxide, aluminum hydroxide, talc, silica, and plastic pigment. Etc.

  The binder used in the present invention is not particularly limited, and a known binder can be used. For example, various copolymer latexes such as styrene / butadiene, styrene / acrylic, vinyl acetate / acrylic, butadiene / methylmethacrylic, or polyvinyl alcohol, oxidized starch, esterified starch, thermochemically modified starch, enzyme modified It can be selected from starch, cold water soluble starch obtained by flash drying them, casein, dextrin and the like alone or in combination of two or more.

  Examples of the copolymer latex include aromatic vinyl monomers such as styrene and α-methylstyrene, aliphatic conjugated diene monomers such as 1,3 butadiene and 2-methyl-1,3 butadiene, acrylic acid, Copolymerization of ethylenically unsaturated acid monomers such as methacrylic acid, acrylonitrile monomers, ethylenically unsaturated carboxylic acid alkyl esters, ethylenically unsaturated carboxylic acid amides, other organic carboxylic acids or their derivatives And a styrene / butadiene / methyl methacrylate / acrylonitrile copolymer.

  The coating method of the aqueous coating composition containing the pigment and latex described above is applied by a blade coating machine. Then, an on-machine coated printing paper having a coating layer provided on the coated base paper is obtained. The coated paper for printing thus coated is dried by a known dryer and then smoothed by a surface finishing facility such as a super calender or a soft calender.

  The method for producing a coated paper for offset printing according to the present invention can be applied to a paper machine operated at a paper making speed of 1000 m / min or more, and in particular, a base paper making process by paper making and a coating process of an aqueous coating composition on the base paper. When the coated paper for offset printing is obtained using an on-machine manufacturing facility in which the finishing process and the finishing process are integrated, generation of wrinkles can be suppressed while providing blister resistance.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto. In the following description,% means mass%. The formulation of the aqueous coating composition (coating solution) is shown in parts.

Example 1
Freeness 450ml csf (Canadian standard freeness) hardwood bleached kraft pulp 100% wood pulp raw material is added so that the content of light calcium carbonate (trademark TP121 Okutama Kogyo Co., Ltd.) is 10% per mass of dry pulp Furthermore, 0.2% of neutral rosin sizing agent (trademark CC167, manufactured by Seiko PMC Co., Ltd.) was added, the wire part part was a gap former made by Metso Paper, and the press part part was a tandem shoe press made by Metso Paper. After the dehydration with the first group felt-felt and the second group felt-belt, the sheet was dried with a single deck dryer having no open draw to produce a paper sheet having a basis weight of 45 g / m ² . Further, the paper sheet was measured by using a film metalizing size press apparatus opticizer manufactured by Metso Paper Co., Ltd., and an aqueous liquid having a solid content concentration of 14% by mass based on an adhesive as a dry coating amount of 1.4 g / After m ² double-sided coating and drying, a coated base paper obtained by flattening the base paper with a calendar was obtained. The base paper is coated with an aqueous coating composition on both sides at a coating speed of 1600 m / min using a blade coating machine so that the dry coating amount on one side is 10 g / m ^2, and then dried. The coated paper for printing of Example 1 was finished by supercalendering at a pressure of 240 kg / cm, a roll temperature of 85 ° C., and a processing speed of 700 m / min.

（ブレード塗工機の水性塗被組成物の配合）

In Example 1, the composition of the aqueous liquid used in the film metering size press and the composition of the aqueous coating composition used in the blade coating machine were as follows.
(Formation of aqueous liquid for film metering size press)

(Composition of aqueous coating composition of blade coating machine)

The physical properties of the obtained coated paper for printing were measured and evaluated by the following methods.
(1) Average particle diameter of pigment:
The measurement was performed using LA-920 (laser particle size distribution measurement) manufactured by HORIBA, Ltd., and the operation method was measured according to the manufacturer's handling work manual.
(2) Brookfield viscosity (B-type viscosity):
It was measured at a rotation of 60 rpm using a BM model of Brookfield viscometer manufactured by TOKIMEC. The operation method was measured according to the manufacturer's handling work manual. The aqueous liquid mainly composed of an adhesive applied by a film metering size press was measured under the condition of a temperature of 50 ° C. after the starch as an adhesive was gelatinized at a solid content concentration of 20% by mass.
(3) Coating amount controllability Good for controllable coating amount in film metering size press ○, difficult to control (workability is lower limit of practical level), difficult to control (workability is low) (Not practical level) was evaluated as x.
(4) Paper Separability Evaluation was made with ◯ indicating that the paper releasing property from the applicator roll in the film metering size press was good, and x indicating poor paper separation (workability was not practical). In particular, those with poor paper separation cause uneven coating on the paper surface.
(5) Evaluation of coated paper elbow:
The obtained coated paper surface for printing was visually evaluated. The evaluation was evaluated as ◯ for no wrinkles (good and practical), x for many (inferior and unusable for practical use), and △ for intermediate ones (slightly inferior and unusable for practical use).
(6) Blister resistance evaluation:
MHI offset web offset press lithopier (BT 2L-800NEO) Printing speed: 600 rpm
When the paper surface temperature was 140 ° C., the case where no blister occurred, and the case where it occurred (inferior and unbearable for practical use) were evaluated as x.
(7) Hijiwa evaluation after off-wheel printing:
MHI offset web offset press lithopier (BT 2L-800NEO) Printing speed: 600 rpm
A paper surface temperature of 130 ° C. was evaluated as “◯” when there was no wrinkle, and “×” when there was a lot, and Δ between them (evaluated as being slightly inferior but practical).

(Example 2)
Aside from applying a dry coating amount of an aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press device to 1.5 g / m ² on both sides and then drying, Finished the coated paper for printing of Example 2 in the same manner as in Example 1.

(Example 3)
The solid content concentration of the aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press apparatus was 16% by mass, and the dry coating amount was 1.7 g / m ² except for ^two sides. Finished the coated paper for printing of Example 3 in the same manner as in Example 1.

Example 4
The solid content concentration of the aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press apparatus was 18% by mass, and the dry coating amount was 2.4 g / m ^{2 on} both sides. Finished the coated paper for printing of Example 4 in the same manner as in Example 1.

(Example 5)
The solid content concentration of the aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metalizing size press apparatus was set to 20% by mass, and the dry coating amount was 2.8 g / m ^{2 on} both sides. Finished the coated paper for printing of Example 5 in the same manner as in Example 1.

(Comparative Example 1)
A solid content concentration of an aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press apparatus was set to 12% by mass, and the dry coating amount was 1.7 g / m ^{2 on} both sides. In the same manner as in Example 1, the coated paper for printing of Comparative Example 1 was finished.

(Comparative Example 2)
Except that the dry coating amount of the aqueous liquid containing phosphoric acid esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press apparatus was 3.2 g / m ^{2 on} both sides, it was the same as in Example 1. The coated paper for printing of Comparative Example 2 was finished.

(Comparative Example 3)
The solid content concentration of the aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press apparatus was 22% by mass, and the dry coating amount was 3.5 g / m ^{2 on} both sides. In the same manner as in Example 1, the coated paper for printing of Comparative Example 3 was finished.

(Comparative Example 4)
An aqueous liquid containing Brookfield viscosity of 150 mPa · s at a temperature of 50 ° C. when gelatinized at a solid content concentration of 20% by mass of oxidized starch MS3800 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press. The coated paper for printing of Comparative Example 4 was finished in the same manner as in Example 1 except that the solid content concentration was 20% by mass and the dry coating amount was 3.4 g / m ^{2 on} both sides.

(Comparative Example 5)
Except that the dry coating amount of the aqueous liquid containing phosphate esterified starch MS4600 (manufactured by Nippon Food Processing Co., Ltd.) in a film metering size press device was 0.9 g / m ^{2 on} both sides, it was the same as in Example 1. The coated paper for printing of Comparative Example 5 was finished.

  The results are summarized in Table 3.

  As is apparent from Table 3, the coated paper produced in the paper machine having a combination of a gap former and a shoe press has a wavy phenomenon such as wrinkles. It is a coated paper that has been prevented, and has also been prevented from wavy phenomena such as wrinkles during off-ring printing.

In Comparative Example 1, since the solid content concentration of the aqueous liquid adhesive was as low as 12% by mass, coated paper wrinkles and wrinkles after off-wheel printing were observed. In Comparative Example 2, since the coating amount of the aqueous liquid was as large as 3.2 g / m ^{2 on} both sides, the coated paper crease and the crease after the off-ring printing were seen, and the blister resistance was not exhibited. In Comparative Example 3, since the solid content concentration was as high as 22% by mass, it was difficult to control the coating amount, paper separation was poor, coated paper wrinkles were observed, and there was no blister resistance. In Comparative Example 4, since the coating amount of the aqueous liquid was large at both sides of 3.4 g / m ² , it was difficult to control the coating amount, paper separation was poor, coated paper wrinkles were observed, and there was no blister resistance. . In Comparative Example 5, since the coating amount of the aqueous liquid was as small as 0.9 g / m ^{2 on} both sides, creases after off-wheel printing were observed, and there was no blister resistance.

Claims (5)

In a method for producing a coated paper for offset printing, a base paper is coated with an aqueous coating composition mainly composed of a pigment and an adhesive, and dried to finish.
As the base paper, a paper meter made with a paper machine combining a gap former and a shoe press, using a film metalizing size press device, starch as a main component and an adhesive solid content concentration of 13 to 13 An aqueous liquid having a viscosity of 20% by mass and a solid content concentration of 20% by mass, a temperature of 50 ° C. and a B-type viscosity of 60 rpm is 100 mPa · s or less is 1.0 to 3.0 g / m on both sides. ^A base paper that is coated and dried at a dry coating amount of ² is used , and the base paper is smoothed by a calendar facility in a step before being coated and dried by a blade coating machine. A manufacturing method of coated paper for offset printing. The offset according to claim 1 , wherein the aqueous coating composition is a coating liquid having a solid content concentration of 65% by mass or more, and the base paper is coated with the aqueous coating composition and dried. A method for producing a coated paper for printing. The basis weight of the base paper is 35 to 70 g / m ² , The method for producing a coated paper for offset printing according to claim 1 or 2 . Claim the method comprising coated process and finishing process of aqueous coated composition to the base paper sheet forming step by papermaking base paper is characterized in that it is produced by on-machine manufacturing facility that integrates 1, 2 or 3 A method for producing a coated paper for offset printing as described in 1. A coated paper for offset printing produced by the method for producing a coated paper for offset printing according to claim 1, 2, 3 or 4 .