JP4987221B2 - Coated paper for printing - Google Patents

Description

  The present invention relates to a coated paper for printing, and relates to a coated paper for printing that is bulky (low density) and excellent in flexibility.

  In recent years, with the progress of visualization and colorization of printed matter, there is an increasing demand for higher quality printing paper. On the other hand, there is a high demand for weight reduction of printed materials in order to reduce transportation and mail costs. Conventionally, these two demands are contradictory, and high-quality printed coated paper has a large base weight and coating amount, and has a higher density than the same basis weight due to smoothing by surface treatment, etc. It was a thing. It is possible to select a low basis weight paper for weight reduction of the printed matter, but if the density is equal, the paper thickness decreases with weight reduction, which is not preferable because the volume of the booklet is impaired. For this reason, a high-quality coated paper that is bulky, that is, has a high paper thickness compared to the same basis weight or a low basis weight compared to the same paper thickness, and satisfies the requirements of coated paper for high-grade printing applications. It has been demanded.

  In recent years, information magazines called “mooks” and “pocket guides”, which have small plates and are convenient to carry, tend to be preferred. Flexibility is important as a characteristic required for these sheets. When rigid paper is used, the smaller the template of the booklet, the easier it is for the page to stand when turning the page, and it is very inconvenient to open and read the booklet with one hand, for example, on the go. Clark stiffness is used as an index of paper flexibility, but stiffness increases in proportion to the cube of the paper thickness, so if the paper thickness increases with the same basis weight due to the increase in bulk, the stiffness increases accordingly. For this reason, it has been considered extremely difficult to achieve both the flexibility and bulkiness of the paper.

  To increase the bulk, the use of bulky pulp and bulky filler increases the bulk of the base paper for coated paper, reduces the coating amount of the coating liquid composition, and reduces the surface treatment of the resulting coated paper. Etc. are considered.

  Pulp for papermaking includes chemical pulp extracted from lignin in fibers with chemicals, and mechanical pulp such as ground mechanical pulp that has been crushed with a grinder without using chemicals, and thermomechanical pulp that has been defibrated with refiners It is divided roughly into. In general, mechanical pulp is more rigid and more effective in reducing density than chemical pulp. However, these mechanical pulps have a problem in terms of standardization when used in high-quality paper, and even in medium-quality paper, there is a limit to the amount of mixing because printing defects such as paper scumming due to bundling fibers are likely to occur. In addition, waste paper pulp is often blended due to the recent increase in environmental protection and the need for resource protection. However, waste paper pulp is generally mixed with fine paper, newsprint, magazines, coated paper, etc., so it is often pulped. Compared with virgin (unused paper) mechanical pulp. High density. As described above, it is difficult to achieve sufficient paper bulkiness only by the pulp surface when considering protection of wood resources and quality design of paper. Moreover, since the bulkiness and the rigidity are increased only by blending the above-described pulp, it is impossible to impart sufficient flexibility to the paper.

  Moreover, use of a bulky filler can be considered as an increase in bulk of the base paper for coated paper. For example, Patent Document 1 discloses a technique for reducing the density by blending a hollow synthetic organic capsule. However, since such synthetic organic materials reduce paper strength, there are problems such as paper scumming and paper breakage during printing, and in order to obtain a sufficient bulky effect, it is necessary to add a high amount, which increases the manufacturing cost. There were also problems such as. Patent Document 2 proposes a method using a shirasu balloon. However, this has a problem in that the miscibility with the pulp for papermaking is poor, and the paper blended with it also has uneven printing. Further, even if the above method is used, it is impossible to impart flexibility to the paper.

  The coated layer of the coated paper is generally higher in density than the base paper. For this reason, compared with the printing paper which does not provide a coating layer, the density of a coated paper is high. Increasing the bulk of the coated paper can also be achieved by reducing the coating amount of the coating composition. This is because the ratio of the coating layer to the entire coated paper is small. However, reducing the coating layer at the same time lowers the coverage of the base paper by the coating layer, thus reducing the printing quality such as blank paper glossiness, smoothness, and printing glossiness, so the target quality is maintained. However, there was a limit to reducing the coating amount.

  In order to improve the print quality of the coated paper, particularly the ink density and the glossiness of the image area (hereinafter referred to as the print glossiness), it is effective to improve the smoothness of the coated paper. One. For this reason, surface smoothing such as super calenders and soft nip calenders is generally applied to glossy paper or coated paper having a glossiness between white and glossy paper called dull tone. It is. However, since these treatments pressurize the paper to increase the smoothness of the surface, the paper thickness of the paper decreases at the same time, and there is a case where sufficient bulkiness cannot be achieved to obtain the target print quality. It was.

  As described above, it has been impossible to obtain a coated paper for printing that is bulky (low density) and excellent in flexibility with only the conventional technique alone or in combination.

JP-A-5-339898 JP-A-52-74001

  In view of such a situation, an object of the present invention is to provide a coated paper for printing that is bulky and excellent in flexibility, is less likely to cause paper breakage in a printing press, and has good workability. is there.

As a result of intensive studies in the difficult situation as described above, the present inventors have found that on a base paper, a printing paper having a coating layer containing a pigment and an adhesive, the basis weight of paper, density, The product of Young's modulus in the paper making direction and the tear length in the paper making direction is 1.0 × 10 ²¹ g ² · N / m ⁶ or more and 4.0 × 10 ²¹ g ² · N / m ⁶ or less, and the pigment By containing 5 to 50 parts by weight of the adhesive with respect to 100 parts by weight, the coating for printing is bulky and excellent in flexibility, is less likely to cause paper breakage in a printing press, and has good workability. We found that paper was obtained. It is preferable that the product of the four members is specified to be 2.0 × 10 ²¹ g ² · N / m ⁶ or more and 3.5 × 10 ²¹ g ² · N / m ⁶ or less. In the present invention, particularly when the coating amount of the coating layer is at least 9 to 25 g / m ² per side, it is bulky, flexible, and has a good printing quality. It is

  The inventors paid attention to the ease of turning a booklet when examining the flexibility of paper. Generally, paper stiffness is quantitatively evaluated by Clark stiffness, pure bending stiffness, and the like. As a result of investigating the correlation between ease of page turning by subjects and pure bending stiffness in the paper making direction and width direction for various booklets, low stiffness paper tended to be flexible. There were different papers for the sensory evaluation of page turnability. That is, it has been found that the flexibility of the paper cannot be evaluated only by bending stiffness.

  When the page is turned, bending stress is applied to the paper, and tensile stress is applied to the convex surface and compressive stress is applied to the concave surface. Therefore, the correlation between the Young's modulus in the width direction and the papermaking direction and the ease of turning was determined. As a result, it was confirmed that even if the pure bending stiffness in the width direction is the same, the lower the Young's modulus in the width direction and the paper making direction, the easier the page is turned. In many of the papers tested, the Young's modulus in the width direction and the papermaking direction had a positive correlation, but when the Young's modulus in the papermaking direction was low, in addition to being easy to turn pages and being flexible, an offset rotary printing press. When printing with, it was found that the fluctuation in tension in the paper feed unit, the cooling roll unit, etc. is small, so that the running stability of the web is increased and the paper breakage hardly occurs.

  The inventors also investigated the relationship between paper strength and flexibility. As a result, it was found that the paper with a shorter tear length tends to be more flexible when compared with paper having the same paper thickness. For example, in the case of paper with a high breaking length, the amount of hydrogen bonds formed between the pulp fibers in the paper is large, and the paper strength tends to be relatively strong. It is considered that the bending stress or tensile stress necessary for obtaining the bending strain or tensile strain of the sheet becomes relatively large, which makes it difficult to turn the page.

From the above, by simultaneously reducing the Young's modulus and tear length of the paper in a well-balanced manner, the flexibility of the paper is improved, which is bulky, that is, a paper having a high paper thickness compared with an equivalent basis weight. It was found that this technique can also be applied. As a result of further intensive studies, the range of Young's modulus and tear length that provides the desired flexibility depends on the density and basis weight, and the higher the basis weight of the paper, the lower the Young's modulus or tear length must be. Good flexibility was not obtained. That is, it has been found that the flexibility of the paper shows a good correlation with the values of the four products of the basis weight, density, Young's modulus in the paper making direction, and tear length in the paper making direction. The product of the four members is 1.0 × 10 ²¹ g ² · N / m ⁶ or more and 4.0 × 10 ²¹ g ² · N / m ⁶ or less, preferably 2.0 × 10 ²¹ g ² · N / m ⁶ or more If it is in the range of 3.5 × 10 ²¹ g ² · N / m ⁶ or less, it is easy to turn the page when the printed material is bound into a booklet. It has been found that the coated paper for printing has good workability with little occurrence of paper breakage. Flexibility that cannot be obtained by increasing the bulk of paper using conventional technology alone or in combination is achieved by reducing the Young's modulus and tear length in a well-balanced manner, and paper with good workability on a printing press can be obtained. It was.

Compared with the same basis weight, the paper whose density is normal and the product of the four is less than 1.0 × 10 ²¹ g ² · N / m ⁶ has too low Young's modulus or tearing The length is low and the paper is not flexible because it is too flexible, or the paper is not easily turned due to the tension in the printing press, and the paper stretched beyond the elastic limit is destroyed. Therefore, the paper break is likely to occur. Compared with the same basis weight, the paper whose Young's modulus and tear length are normal and the product of the four is less than 1.0 × 10 ²¹ g ² · N / m ⁶ is excessively dense. However, it is necessary to extremely reduce the press and calendering pressure in the paper making process, so that it is difficult to print with extremely low smoothness.

On the other hand, compared with the same basis weight, the paper whose density is a normal value and the value of the product of the four members exceeds 4.0 × 10 ²¹ g ² · N / m ⁶ has an excessively high tear length. Or the Young's modulus is high, the paper becomes rigid and flexible paper cannot be obtained, and when the Young's modulus is high, the paper becomes stiff, and furthermore, it cannot absorb the fluctuation in tension during printing, and partially has high stress. Therefore, troubles such as paper breakage are likely to occur. Compared with the same basis weight, paper whose Young's modulus and tear length are normal values and the product of the four members exceeds 4.0 × 10 ²¹ g ² · N / m ⁶ has an extremely high density. That is, it is not a bulky and voluminous coated paper intended for the present invention.

  According to the present invention, it is possible to obtain a coated paper for printing that is bulky (low density), excellent in flexibility, hardly breaks in a printing press, and has good workability.

The product of the basis weight, density, Young's modulus in the paper making direction, and tear length in the paper making direction is 1.0 × 10 ²¹ g ² · N / m ⁶ or more and 4 × 10 ²¹ g ² · N / m ^In order to obtain a range of ⁶ or less, it is preferable to combine means for reducing the paper density, the Young's modulus in the papermaking direction, and the tearing length in the papermaking direction. Methods for reducing the density of the paper include a method of improving the blending ratio of low density pulp and low density filler, use of bulky chemicals, reduction of press pressure in the paper making process and processing linear pressure of the machine calendar, etc. Can be mentioned. Examples of a method for reducing the Young's modulus of the paper include the use of a softening agent. Examples of a method for reducing the breaking length of the paper in the paper making direction include a method of increasing the blending ratio of the filler.

  In the present invention, it is preferable to use a softening agent. The softening agent to be used has an action of inhibiting the binding between pulp fibers or softens the fibers themselves. For example, it is a compound having a hydrophobic group and a hydrophilic group, and is an oil-based nonionic surfactant, a sugar alcohol-based nonionic surfactant, a sugar-based nonionic surfactant, a polyhydric alcohol-type nonionic surfactant, a higher alcohol Polyesters of polyhydric alcohols and fatty acids, polyoxyalkylene compounds of higher alcohols or higher fatty acids, polyoxyalkylene adducts of ester compounds of polyhydric alcohols and fatty acids, fatty acid polyamidoamines, and the like can be used. Those capable of reducing the pure bending stiffness and density in addition to the decrease in Young's modulus are preferable, and it is preferable to use an ester compound of a polyhydric alcohol and a fatty acid.

  In the present invention, for example, hardwood bleached kraft pulp (hereinafter referred to as LBKP), softwood bleached kraft pulp (hereinafter referred to as NBKP), thermomechanical pulp, ground wood pulp, waste paper pulp, and the like are used as the type of pulp blended into the base paper. In order to improve roughening on the printing press, it is preferable to use chemical pulp of LBKP or NBKP. Moreover, since Young's modulus tends to decrease when a filler is contained in the paper, it is preferable to contain a filler. As the filler, heavy calcium carbonate, light calcium carbonate, kaolin, clay, talc, hydration Known fillers such as silicic acid, white carbon, titanium oxide, and synthetic resin fillers can be used. The amount of filler used is preferably 6% by weight, more preferably 10% by weight or more, based on the weight of the pulp. Further, if necessary, a sulfuric acid band, a sizing agent, a paper strength enhancer, a softening agent, a yield improver, a colorant, a dye, an antifoaming agent and the like may be contained.

  Furthermore, a surface treatment agent mainly composed of a water-soluble polymer may be applied to the base paper for the purpose of improving the surface strength and sizing properties within a range that does not affect the density, Young's modulus, and tearing length. As the water-soluble polymer, those usually used as surface treating agents such as oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch, polyacrylamide, polyvinyl alcohol, etc. can be used alone or a mixture thereof. . In addition to the water-soluble polymer, a paper strength enhancer for the purpose of water resistance and surface strength improvement and an external sizing agent for the purpose of imparting sizing can be added to the surface treatment agent. The surface treatment agent can be applied by a coating machine such as a two-roll size press coater, a gate roll coater, a blade metering size press coater, a rod metering size press coater, or a film transfer type roll coater such as a shim sizer. it can. The pH of the base paper for coated paper used in the present invention may be any of acidic, neutral and alkaline.

  In the present invention, a coating layer having a pigment and an adhesive is provided on the base paper within a range not affecting the density, Young's modulus, and tearing length.

  Kaolin, clay, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, barium sulfate, calcium sulfate, zinc oxide conventionally used for coated paper as a pigment used in the coating layer Inorganic pigments such as silicic acid, silicate, colloidal silica, and satin white, and organic pigments such as plastic pigments, and these pigments can be used by appropriately selecting one or more kinds as necessary.

  Adhesives used in the present invention are conventionally used for coated paper, such as styrene / butadiene, styrene / acrylic, ethylene / vinyl acetate, butadiene / methyl methacrylate, vinyl acetate / butyl acrylate, etc. And various synthetic copolymers such as polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer; proteins such as casein, soy protein, synthetic protein; oxidized starch, positive starch, urea Appropriate selection of one or more adhesives for ordinary coated paper such as phosphated starch, etherified starch such as hydroxyethyl etherified starch, starch such as dextrin; cellulose derivatives such as carboxymethylcellulose, hydroxyethylcellulose, hydroxymethylcellulose Used. These adhesives are required to be used in an amount of 5 to 50 parts by weight, preferably in the range of about 5 to 25 parts by weight with respect to 100 parts by weight of the pigment. Moreover, various auxiliary | assistant mix | blended with the pigment for normal coated papers, such as a dispersing agent, a thickener, a water retention agent, an antifoamer, a water-resistant agent, and a coloring agent, are used suitably as needed.

The coating layer provided on the base paper can be provided as a single layer or two or more layers on one side or both sides of the base paper as long as the density, Young's modulus, and tearing length are not affected. The coating amount of the coating layer is more preferably 10 to ²⁰ g / m ² per side.

  Film transfer type rolls such as a two-roll size press coater, a gate roll coater, a blade metalling size press coater, a rod metalling size press coater, and a shim sizer are used as methods for coating the coating composition on the base paper. In addition to coaters, flooded nip / blade coaters, jet fountains / blade coaters, short dwell time application type coaters, rod metering coaters that use grooved rods, plain rods, etc. instead of blades, curtain coaters, die coaters It can be coated with a known coater such as a coater.

In addition, the coated paper obtained by the above-described method can be surface-treated within a range that does not affect the density in order to improve paper smoothness and print quality. As the surface treatment method, a known surface treatment apparatus such as a super calender using a cotton roll as an elastic roll or a soft nip calender using a synthetic resin roll as an elastic roll can be used. The soft nip calender can be set at a higher heat resistance temperature on the surface of the synthetic resin roll than that of the cotton roll, so that it can be processed at a high temperature. When the same smoothness is targeted, the treatment linear pressure may be set lower than that of the super calender, which is preferable because a coated paper with lower density and higher smoothness can be obtained. The coated paper for printing of the present invention preferably has a density of 1.00 g / cm ³ or less, more preferably 0.90 g / cm ³ or less.

EXAMPLES Hereinafter, although the Example and comparative example of this invention are given and demonstrated further in detail, this invention is not limited at all by these. In addition, unless otherwise indicated, the part and% in an example show a weight part and weight%, respectively. The obtained coated paper for printing was tested based on the following evaluation method.
<Evaluation method>
(Weight) According to JIS P 8124: 1998.
(Density) According to JIS P 8118: 1998.
(Young's modulus) The tensile elastic modulus was measured according to JIS P 8113: 1998, and this value was defined as Young's modulus.
(Tearing length) According to JIS P 8113: 1998 (Flexibility: Ease of turning pages) When cutting a blank sheet of 100 sheets into A5 size, creating a booklet model with clips, and turning the page The ease of turning was evaluated by a monitor of 10 people in four stages: ◎ very excellent, ◯ excellent, △ somewhat problematic, and 問題 problematic.
(Workability on the printing machine) Sample winding is printed on a rotary offset printing machine at a printing speed of 250 m / min, and a length of 6,000 m is printed. The tension fluctuation of the infeed part and cooling roll part during printing Were evaluated in three stages: small, large, slightly large, large or paper breakage occurred.
[Example 1]
Basis weight containing 100 parts of chemical pulp as paper pulp, 12 parts of light calcium carbonate as filler, 0.3 part of ester compound of polyhydric alcohol and fatty acid (KB-110, manufactured by Kao Corporation) as softening agent ^On a base paper of 64 g / m ² , 80 parts of heavy calcium carbonate as a pigment, 10 parts of secondary kaolin, 10 parts of fine kaolin, 0.05 part of sodium polyacrylate as a dispersant, carboxy-modified styrene butadiene as a binder Add 11 parts of latex and 4 parts of phosphate esterified starch, and then add water to adjust the solid content to 65% so that the coating amount is 14 g / m ² per side. Double-side coating was performed with a blade coater at a speed of 800 m / min to obtain a coated paper for printing.
[Example 2]
A coated paper for printing was obtained in the same manner as in Example 1, except that 80 parts of heavy calcium carbonate and 20 parts of fine kaolin were used as pigments contained in the coating solution.
[Example 3]
Basis weight containing 100 parts of chemical pulp as paper pulp, 12 parts of light calcium carbonate as filler, 0.5 part of ester compound of polyhydric alcohol and fatty acid (KB-110, manufactured by Kao Corporation) as softening agent A base paper of 76 g / m ² , 65 parts of heavy calcium carbonate as a pigment, 7 parts of secondary kaolin, 28 parts of fine kaolin, 0.05 part of sodium polyacrylate as a dispersant, carboxy-modified styrene butadiene as a binder 9 parts of latex and 2.5 parts of phosphate esterified starch were added, and water was further added to adjust the solid content concentration to 64%, so that the coating amount was 13 g / m ² per side. Double-sided coating was performed with a blade coater at a coating speed of 500 m / min to obtain a coated paper for printing.
[Practical example 4]
Basis weight containing 100 parts of chemical pulp as paper pulp, 12 parts of light calcium carbonate as filler, 0.3 part of ester compound of polyhydric alcohol and fatty acid (KB-115, manufactured by Kao Corporation) as softening agent ^On a base paper of 64 g / m ² , 80 parts of heavy calcium carbonate as a pigment, 10 parts of secondary kaolin, 10 parts of fine kaolin, 0.05 part of sodium polyacrylate as a dispersant, carboxy-modified styrene butadiene as a binder Add 11 parts of latex and 4 parts of phosphate esterified starch, and then add water to adjust the solid content to 65% so that the coating amount is 14 g / m ² per side. Double-side coating was performed with a blade coater at a speed of 800 m / min to obtain a coated paper for printing.
[Comparative Example 1]
A base paper with a basis weight of 76 g / m ² containing 100 parts of chemical pulp as paper pulp and 12 parts of light calcium carbonate as a filler, 80 parts of heavy calcium carbonate as a pigment, 10 parts of secondary kaolin, and fine kaolin 10 parts, 0.05 part of polyacrylic acid soda as a dispersant, 11 parts of carboxy-modified styrene butadiene latex as a binder, 4 parts of phosphate esterified starch, and water were added to adjust the solid content concentration to 65%. The coating liquid was coated on both sides with a blade coater at a coating speed of 800 m / min so that the coating amount was 14 g / m ² per side to obtain a coated paper for printing.
[Comparative Example 2]
100 parts of chemical pulp as paper pulp, 12 parts of light calcium carbonate as filler, base paper with a basis weight of 103 g / m ² , 65 parts of heavy calcium carbonate as pigment, 7 parts of secondary kaolin, fine kaolin 28 parts, 0.05 parts of sodium polyacrylate as a dispersant, 9 parts of carboxy-modified styrene butadiene latex as a binder, 2.5 parts of phosphate esterified starch, and water to add a solid content concentration of 64% The coating liquid prepared in the above manner was coated on both sides with a blade coater at a coating speed of 500 m / min so that the coating amount was 13 g / m ² per side to obtain a coated paper for printing.
[Comparative Example 3]
A base paper having a basis weight of 55 g / m ² containing 100 parts of chemical pulp as papermaking pulp and 12% of light calcium carbonate as a filler, 95 parts of heavy calcium carbonate as a pigment, 5 parts by weight of secondary kaolin, A coating solution prepared by adding 0.05 part of sodium polyacrylate as a dispersant, 4 parts of carboxy-modified styrene butadiene latex as a binder, 20 parts of phosphate esterified starch, and adjusting the concentration to 40% by adding water, Double-side coating is performed with a film transfer roll coater with a coating speed of 1000 m / min so that the coating amount is 3 g / m ² per side, and further 80 parts of heavy calcium carbonate and 20 parts of fine kaolin as a pigment. 0.05 parts of polyacrylic acid soda as a dispersant and carboxy-modified styrene butadiene latex as a binder 11 parts, 4 parts of phosphoric acid esterified starch, water was added, and the coating solution adjusted to a solid content concentration of 64% was applied at a coating speed of 11 g / m ² per side. Double-side coating was performed with a blade coater at 900 m / min to obtain a coated paper for printing.
[Comparative Example 4]
A coated paper for printing was obtained in the same manner as in Comparative Example 3 except that the basis weight of the base paper was 82 g / m ² .
[Comparative Example 5]
A coated paper for printing was obtained in the same manner as in Example 1 except that the basis weight of the base paper was 40 g / m ² and the coating amount was 12 g / m ² per side.

  The coated paper for printing produced under the above conditions was measured for basis weight, density, Young's modulus in the papermaking direction, and tear length in the papermaking direction, and the product of the four was calculated. Further, the evaluation of the ease of turning pages when the book was bound to a booklet and the workability on a printing press were performed, and the results are shown in Table 1.

表１から明らかなように、坪量、密度、抄紙方向のヤング率、および抄紙方向の裂断長の４者の積の値が１．０×１０²¹ｇ²・Ｎ／ｍ^６以上４．０×１０²¹ｇ²・Ｎ／ｍ^６以下の範囲にあれば、原紙、顔料塗被層の組成の違いの有無にかかわらず、柔軟性に優れるためページがめくりやすく、かつ嵩高で、印刷機での作業性も優れる印刷用塗被紙であることが明らかである。

As is clear from Table 1, the value of the four products of basis weight, density, Young's modulus in the paper making direction, and breaking length in the paper making direction is 1.0 × 10 ²¹ g ² · N / m ⁶ or more. If it is in the range of 0 × 10 ²¹ g ² · N / m ⁶ or less, regardless of the difference in the composition of the base paper and the pigment coating layer, it is excellent in flexibility and the page is easy to turn and bulky. It is clear that the coated paper for printing has excellent workability.

Claims (3)

Oil-based nonionic surfactant, sugar alcohol-based nonionic surfactant, sugar-based nonionic surfactant, polyhydric alcohol-type nonionic surfactant, higher alcohol, ester compound of polyhydric alcohol and fatty acid, higher alcohol or A pigment and an adhesive are contained on a base paper obtained by using at least one of a polyoxyalkylene compound of a higher fatty acid, a polyoxyalkylene adduct of a polyhydric alcohol and a fatty acid ester compound, and a fatty acid polyamidoamine. In a coated paper having a coating layer, the density is 1.00 g / cm ³ or less, the basis weight, the density, the Young's modulus in the paper making direction, and the breaking length in the paper making direction are 1.0 × 10 4 ²¹ g ² · N / m ⁶ or more and 4.0 × 10 ²¹ g ² · N / m ⁶ or less, and the coating layer contains 5 to 50 parts by weight of the adhesive with respect to 100 parts by weight of the pigment. The Characteristic coated paper for printing. The product of the basis weight, density, Young's modulus in the paper making direction, and tear length in the paper making direction is 2.0 × 10 ²¹ g ² · N / m ⁶ or more and 3.5 × 10 ²¹ g ² · N / m ⁶ The coated paper for printing according to claim 1, wherein: The coated paper for printing according to claim 1 or 2, wherein the coating amount of the coating layer is at least 9 to 25 g / m ² per side.