JP6204202B2 - Uncoated paper type printing paper for industrial inkjet printers - Google Patents

Description

  The present invention relates to a non-coated paper type printing paper for an industrial inkjet printer used in an industrial inkjet printer for commercial printing.

  2. Description of the Related Art Industrial inkjet printers that use an inkjet recording method are well known as industrial or commercial printers for producing a large number of commercial prints because of rapid advances in inkjet recording technology (for example, patents) References 1 and 2, Non-Patent References 1 and 2). Industrial inkjet printers are sold under the names such as Truepress Jet from Dainippon Screen Manufacturing, MJP series from Miyakoshi, Prosper and VERSAMAR from Kodak, and JetPress from FUJIFILM.

  Such an industrial inkjet printing machine, although depending on printing conditions, has a color printing speed of 10 to several tens of times faster than that of general-use and SOHO inkjet printers and large-format inkjet printers, and a printing speed of 15 m. / Min., More than 60 m / min at higher speeds. For this reason, industrial inkjet printers are distinguished from general household and SOHO inkjet printers and large format inkjet printers.

  Industrial inkjet printers can adapt to on-demand printing because they can handle variable information. Printers print fixed information on conventional printing machines such as gravure, offset, letterpress, flexographic, thermal transfer or toner printers, and variable information on industrial inkjet printers. In many cases, such a form is adopted. In particular, offset printers are often used from the viewpoint of printing image quality and manufacturing cost.

  Therefore, it is necessary to have printability for both printing by a conventional printing machine such as an offset printing machine and printing by an industrial inkjet printing machine. Without these printing aptitudes, it is impossible to produce a printed matter having a sufficient image quality as a product by these printing machines.

Excellent ink absorbability for industrial inkjet printers that use water-based dye inks and water-based pigment inks while maintaining offset printing suitability, dye ink image water resistance and pigment ink image scratch resistance, and printing unevenness As a plain paper type printing paper with good quality, a support mainly composed of cellulose pulp and calcium carbonate as a filler, and a cationic resin and a polyvalent cation salt in a sum of both are 1.0 g / m ² or more. will be deposited at 5.0 g / m ² or less in the range, the ratio of the cationic resin and a polyvalent cation salt is 0: 100 to 90: printing paper 10 in a plain paper type are known (e.g., Japanese Patent Reference 3).

JP 2011-251231 A JP 2005-088525 A JP 2012-071518 A

Tokasu Michiko, “B2 size printing ink jet printer” (“Printing magazine”, published by the Japan Society of Printing Press, August 2010 (Vol.93), pp. 21-24) Yasutoshi Miyagi “Inkjet Printing Machine with Offset Quality” (“Printing Magazine”, published by the Printing Society Press, August 2010 (Vol.93), pp. 25-29)

  Ink used in industrial inkjet printers roughly includes water-based dye ink and water-based pigment ink.

  Water-based dye inks and water-based pigment inks have different drawbacks. In the case of water-based dye ink, if the ink absorption of the printing paper becomes insufficient as the printing speed increases, bleeding may occur at the color boundary in the printed portion. Therefore, a printing paper with good ink absorbability is desired. In aqueous pigment inks, when the printing speed increases, if the ink absorbability of the printing paper varies partially, the color density of the printed portion may become non-uniform. This is due to the principle of inkjet, which ejects ink droplets from fine nozzles, and the ink used in industrial inkjet printers has a lower colorant content concentration than the ink of conventional printers such as offset printers. Because. Therefore, a printing paper having excellent color density uniformity is desired.

  In the non-coated paper type printing paper, ink cannot be absorbed or fixed by using the coating layer, and therefore, the ink see-through phenomenon is likely to occur. In particular, the ink used in industrial ink jet printers has a low colorant content concentration and a large amount of ink solvent, so that the ink see-through phenomenon is more likely to occur. Further, in the case of the non-coated paper type, if the ink absorptivity is increased, the ink see-through phenomenon is likely to occur. Therefore, it is necessary to optimize the balance between the two. “Ink breakthrough” is a phenomenon in which ink reaches the deep part of the paper without stopping on the printing side, and the printed image is visually recognized from the opposite side. In commercial printing, duplex printing is often performed, and the phenomenon of ink breakthrough impairs the value as a product.

  Although the printing paper as described in Patent Document 3 is excellent in ink absorbability and print unevenness suppression with respect to industrial inkjet printing machines while maintaining offset printing suitability, further improvement in ink back-through is achieved. is necessary.

An object of the present invention is to provide a non-coated paper type printing paper for an industrial inkjet printer having the following performance.
1. Have printability for an offset printer (offset printability).
2. Good ink absorbency for industrial inkjet printers that use water-based dye inks.
3. Excellent anti-through-through control of ink for industrial inkjet printers that use water-based dye inks.
4). Excellent color density uniformity in the printed area for industrial inkjet printers that use water-based pigment inks.
5. Excellent anti-through-through control of ink for industrial inkjet printers that use water-based pigment ink.

As a result of intensive studies conducted by the inventor in view of the above, the object of the present invention is to contain at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt, and have a basis weight of 50 g / m ² or more and 90 g. / M ² or less, the opacity according to JIS P 8149 is 89.0% or more, the steecht sizing degree according to JIS P 8122 is 5 seconds or more and 25 seconds or less, and the 10-second Cobb sizing degree according to JIS P 8140 is 10 seconds. It is achieved by a non-coated paper type printing paper for industrial ink jet printers having a ratio of 10 g / m ^{2 to} 100 g / m ² and 10 sec Cobb sizing to 1 to 15 sizing .

Preferably, the size press is a method in which at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt is contained in a non-coated paper type printing paper for an industrial ink jet printing machine. The dry solid content conversion total content of the compound selected from the cationic resin and the water-soluble polyvalent cation salt in the non-coated paper type printing paper for inkjet printers is 0.2 g / m ² or more and 8.0 g / m. ² or less.

  Preferably, the cationic resin is a dimethylamine-epichlorohydrin polycondensate. Preferably, the water-soluble polyvalent cation salt is a calcium salt capable of dissolving 1% by mass or more in 20 ° C. water.

  INDUSTRIAL APPLICABILITY According to the present invention, the present invention has printability for an offset printing machine, ink absorbability and ink back-through suppression for an industrial inkjet printer using a water-based dye ink, and an industrial inkjet printer using an aqueous pigment ink. It is possible to provide a non-coated paper type printing paper for an industrial inkjet printing machine, which is excellent in uniformity of color density and suppression of ink back-through.

  Hereinafter, the non-coated paper type printing paper (hereinafter, simply referred to as “printing paper”) for the industrial inkjet printer of the present invention will be described in detail. As used herein, “inkjet printing” refers to printing using an industrial inkjet printer. The “non-coated paper type” refers to a printing paper that does not have a clear coating layer when the cross section of the printing paper is enlarged and observed with an electron microscope.

  There are two types of industrial inkjet printers, continuous paper type and cut paper type, depending on the paper conveyance. Ink types to be mounted include an aqueous dye ink whose color material is a dye and an aqueous pigment ink whose color material is a pigment. In the present invention, any paper conveyance or ink type of the industrial inkjet printing machine may be used.

  In the present invention, the printing speed of the industrial inkjet printer is 60 m / min or more. Inkjet printing is possible even at a printing speed lower than this, but the printing speed at which the effect of the present invention is remarkably recognized is 60 m / min or more. Further, productivity is emphasized from the viewpoint of industrial use, and a productivity of 60 m / min or more is desired. In the case of the cut paper type, the printing speed is calculated from the paper size to be printed per minute.

  If variable information and fixed information exist in the image to be printed, a part or all of the fixed information can be transferred from conventional methods such as gravure printers, offset printers, letterpress printers, flexographic printers, thermal transfer printers or toner printers. It is preferable to print using a printing machine. In particular, an offset printer is preferable in terms of print image quality and manufacturing cost. Conventional printers may be before or after printing using an industrial inkjet printer.

  In the present invention, a conventional printing machine is, for example, a gravure printing machine, an offset printing machine, a letterpress printing machine, a flexographic printing machine, a thermal transfer printing machine, or a toner printing machine. The gravure printing machine is a type of printing machine that transfers ink to a printing medium through a roll-shaped plate cylinder in which an image is engraved. The offset printing machine is an indirect printing type printing machine in which ink is once transferred to a blanket and then transferred again to a printing medium. The letterpress printing machine is a letterpress type printing machine that performs printing by applying pressure so that the ink applied to the letterpress is pressed against the printing medium. A flexographic printing machine is a letterpress type printing machine that uses a flexible and elastic resin plate. The thermal transfer printer is a printer that uses ink ribbons of various colors, and is a printer that transfers a color material from an ink ribbon to a printing medium by heat. The toner printing machine is an electrophotographic printing machine that transfers toner to a printing material using static electricity from toner adhering to a charging drum.

  The printing paper of the present invention can be obtained by incorporating at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt into the base paper. Base paper is chemical pulp such as LBKP (Leaf Bleached Kraft Pulp), NBKP (Needle Bleached Kraft Pulp), GP (Groundwood Pulp), PGW (Pressure Ground Wood pulp), RMP (Refiner Mechanical Pulp), TMP (ThermoMechanical Pulp), CTMP (ChemiThermoMechanical Pulp), CMP (ChemiMechanical Pulp), mechanical pulp such as CGP (ChemiGroundwood Pulp), and at least one cellulose pulp selected from waste paper pulp such as DIP (DeInked Pulp), filler, and if necessary Paper made by paper, containing various additives such as a sizing agent, a fixing agent, a retention agent, and a cationizing agent, by a conventionally known method of acidity, neutrality, and alkalinity.

  In the present invention, a conventionally known white pigment can be used as a filler. Examples of white pigments include light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, alumina, lithopone, Mention may be made of white inorganic pigments such as zeolite, magnesium carbonate and magnesium hydroxide. Further examples include white organic pigments such as styrene plastic pigments, acrylic plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins. Moreover, multiple types can be used together from these.

  In the present invention, the ash content of the printing paper is preferably 15% by mass or more and 30% by mass or less. The reason for this is that when the ash content is in the above range, the relationship between the ink back-through inhibiting property and the physical strength of the printing paper can be satisfactorily achieved. When the ash content of the printing paper is less than 15% by mass, the ability to prevent ink from falling through may decrease. When the ash content of the printing paper exceeds 30% by mass, troubles such as paper smearing and powder falling may occur during printing by an offset printing machine, for example.

  The ash content of the present invention is a ratio (mass%) to the mass of incombustible material after subjecting the base paper to a combustion treatment at 500 ° C. for 1 hour and the absolutely dry mass of the printing paper before the combustion treatment. The amount of ash can be controlled by a conventionally known method such as adjusting the filler content in the base paper.

  In the present invention, the base paper includes, as other additives, a pigment dispersant, a thickener, a fluidity improver, an antifoaming agent, an antifoaming agent, a release agent, a foaming agent, a penetrating agent, a coloring dye, a coloring pigment, A fluorescent whitening agent, an ultraviolet absorber, an antioxidant, an antiseptic, a baitproofing agent, a water-proofing agent, a paper strength enhancing agent, and the like can be appropriately contained as long as the desired effects of the present invention are not impaired.

  In the present invention, the Steecht sizing degree of a printing paper is a value measured in accordance with JIS P8122. The degree of sizing of the printing paper of the present invention is 5 seconds or more and 25 seconds or less. When the print paper has a Steecht sizing degree of less than 5 seconds, the ink show-through suppression and offset printing suitability for an industrial inkjet printer using aqueous dye ink are poor. When the Steiff human sizing degree exceeds 25 seconds, the ink absorbability with respect to an industrial ink jet printer using an aqueous dye ink is poor.

In the present invention, the cobb sizing degree of printing paper is a value measured according to JIS P 8140. The contact time between the printing paper and the measurement solvent is 10 seconds, and the 10-second Cobb sizing degree of the present invention is 20 g / m ² or more and 100 g / m ² or less. When the 10 second cobb sizing degree of the printing paper is less than 20 g / m ^{2, the} color density uniformity is inferior to that of an industrial inkjet printer that uses aqueous pigment ink. When the 10-second Cobb sizing degree of the printing paper exceeds 100 g / m ² , the ink show-through suppression and the offset printing suitability for an industrial inkjet printer are inferior.

In the present invention, representative indexes generally indicating the size of the printing paper include a Steecht sizing degree and a Cobb sizing degree having different measurement principles. There are various Steecht sizing values and Cobb sizing values for paper used in conventional printers. However, it is not possible to sufficiently optimize the printability for ink jet printing only by individually examining these indices. The ratio of the 10 second Cobb sizing degree to that of the printing paper , that is, the ratio of the 10 second Cobb sizing degree / Stick human sizing degree is obtained, and the ratio is within a specific range, so that the marked optimization is achieved. . As a result, the printing paper has offset printing suitability, ink absorbency for industrial ink jet printers using aqueous dye ink, color density uniformity and industrial use for industrial ink jet printers using aqueous pigment ink It is possible to obtain the ink see-through suppression property for the ink jet printer. In the present invention, the ratio of the 10 second Cobb sizing degree / Stecht sizing degree of the printing paper is 1 or more and 15 or less. When the ratio of 10 second Cobb sizing / Sticht sizing of the printing paper of the present invention is less than 1, the ink absorbability for an industrial ink jet printer using aqueous dye ink and the industrial ink jet using aqueous pigment ink The uniformity of color density on the printing press is poor. When the ratio of the 10-second Cobb sizing degree / Stechtite sizing degree of the printing paper exceeds 15, the ink see-through suppressing property for an industrial inkjet printer or the printability by an offset printer is inferior.

  In the present invention, the sizing degree of the printing paper is determined by applying the type and content of the sizing agent internally added to the base paper, the type and content of the filler, the type and content of additives such as a paper strength enhancer, and the base paper. It can be adjusted according to the type and coating amount of the surface sizing agent and the type and content of the cationic resin or water-soluble polyvalent cation salt of the base paper. The sizing agent internally added to the base paper is, for example, rosin sizing agent for acidic paper, alkenyl succinic anhydride, alkyl ketene dimer, neutral rosin sizing agent or cationic styrene-acrylic for neutral paper. Such as sizing agents. The surface sizing agent is, for example, a styrene-acrylic sizing agent, an olefinic sizing agent, or a styrene-maleic sizing agent.

  In the present invention, the printing paper contains at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt in the base paper, whereby at least selected from a cationic resin and a water-soluble polyvalent cation salt. Contains one compound.

  The method of adding at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt to a printing paper is as follows: (1) A method of adding paper to paper and making paper; (2) Size press There are a method of adding to the liquid and applying using a size press, and (3) a method of adding to the surface treatment liquid and applying using a coating means such as a curtain coater or an air knife coater other than the size press. In the present invention, the method of (2) above is preferable as the method of incorporating at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt into the base paper. This is because in the method (2), at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt can be most uniformly contained in the vicinity of the surface of the base paper.

  In the present invention, the cationic resin is a cationic polymer or a cationic oligomer, and conventionally known ones can be used. Preferred cationic resins are polymers or oligomers containing primary to tertiary amines or quaternary ammonium salts that readily coordinate with protons and dissociate when dissolved in water to exhibit cationic properties. Specific examples of the cationic resin include polyethyleneimine, polyvinyl pyridine, polyamine sulfone, polydialkylaminoethyl methacrylate, polydialkylaminoethyl acrylate, polydialkylaminoethyl methacrylamide, polydialkylaminoethyl acrylamide, polyepoxyamine, polyamidoamine, Compounds such as dicyandiamide-formalin condensate, polyvinylamine, polyallylamine and their hydrochlorides, and further polydiallyldimethylammonium chloride and copolymers of diallyldimethylammonium chloride and acrylamide, polydiallylmethylamine hydrochloride, dimethylamine- Aliphatic monoamines such as epichlorohydrin polycondensate and diethylenetriamine-epichlorohydrin polycondensate Or there may be mentioned polycondensation products of aliphatic polyamines and epihalohydrins compounds, but are not limited to. From the viewpoint of commercial availability, dimethylamine-epichlorohydrin polycondensate is preferred. In the present invention, the average molecular weight of the cationic resin is not particularly limited, but is preferably in the range of 500 or more and 20,000 or less.

  In the present invention, the water-soluble polyvalent cation salt is a water-soluble salt containing a metal polyvalent cation. A preferred polyvalent cation salt is a salt that contains a polyvalent metal cation and can be dissolved in water at 20 ° C. in an amount of 1% by mass or more. Examples of polyvalent cations of metals include divalent cations such as magnesium, calcium, strontium, barium, nickel, zinc, copper, iron, cobalt, tin and manganese; trivalent cations such as aluminum, iron and chromium Or tetravalent cations such as titanium and zirconium; and complex ions thereof. The anion that forms a salt with the metal polyvalent cation may be either an inorganic acid or an organic acid, and is not particularly limited. Examples of inorganic acids include hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, boric acid, hydrofluoric acid, and the like. Examples of the organic acid include formic acid, acetic acid, lactic acid, citric acid, oxalic acid, succinic acid, and organic sulfonic acid. However, the sulfuric acid band conventionally used as a sizing agent is excluded.

  In the present invention, the water-soluble polyvalent cation salt is preferably a calcium salt such as calcium chloride, calcium formate, calcium nitrate, or calcium acetate. This is because the color density uniformity is better for industrial inkjet printers using aqueous pigment ink while having offset printability. From the viewpoint of chemical cost, calcium chloride or calcium nitrate is preferable.

  In the present invention, “(2) A method of adding to a size press solution and applying it using a size press” is a method for containing at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt in a base paper. In this case, a conventionally known surface sizing agent can be added to the size press solution in addition to at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt.

  In the present invention, the size press is a conventionally known method. Examples of size presses include an incline size press, a horizontal size press, a rod metalling size press, a roll metalling size press, and a blade metalling size press as a film transfer system. A gate roll coater can be mentioned as a speed sizer, a film press, and a roll metering size press. In addition, a bill blade coater, a twin blade coater, a bellbapa coater, a tab size press, a calendar size press, and the like can be given. Preferred are an incline size press, a horizontal size press, a gate roll coater, a shim sizer, and a film press.

In the present invention, the total content in terms of dry solid content in the printing paper of a compound selected from a cationic resin and a water-soluble polyvalent cation salt is preferably 0.2 g / m ² or more and 8.0 g / m ² or less. In the case of “(2) Method of adding to size press solution and applying using size press”, the total content in terms of dry solid content per side is preferably 0.1 g / m ² or more and 4.0 g / m ² or less. . The total content means the content in terms of dry solid content in the printing paper in which all compounds selected from a cationic resin and a water-soluble polyvalent cation salt are totaled. In the case of “(2) Method of adding to size press liquid and applying using size press”, it can be determined from the coating amount in terms of dry solid content by size press. When the total solid content in terms of dry solid content in the printing paper of the compound selected from the cationic resin and the water-soluble polyvalent cation salt is within the above range, at least one of the effects according to the present invention for an industrial inkjet printer is Become better.

  In the present invention, the printing paper can be used after calendaring.

  However, if an excessive calendar process is performed, the gaps in the printing paper are crushed, and as a result, the printability of the printing paper for ink-jet printing is lowered.

In the present invention, the basis weight of the printing paper is 50 g / m ² or more and 90 g / m ² or less, and the opacity according to JIS P 8149 is 89.0% or more. The reason for this is that if the basis weight is 50 g / m ² or more and 90 g / m ² or less, the ink see-through inhibiting property of the present invention is remarkably exhibited. In addition to invoices and transaction statements, the basis weight of printing paper is 50 g / m ² or more and 90 g / m ² or less because of commercial printing applications such as insert advertisements, direct mail, or so-called transpromo that combines them. It is because it is preferable. Further, when the opacity is less than 89.0%, the ink see-through inhibiting property of the present invention is inferior.

  The printing paper of the present invention is used in an industrial inkjet printer. A preferred industrial inkjet printer is a rotary industrial inkjet printer having a printing speed of more than 120 m / min. In addition to industrial inkjet printers, it can also be used in commercially available inkjet printers for SOHO.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded. In addition, “parts” and “%” shown in the examples indicate dry solids equivalents or parts by mass and mass% of the substantial components, unless otherwise specified. Moreover, the coating amount indicates a dry solid content conversion amount.

(Preparation of printing paper)
Example 1
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene dimeric sizing agent was added (AS-263, Seiko PMC Corporation) 0.1 parts by papermaking with a Fourdrinier paper machine, size press one side per phosphorylated starch in apparatus 1.5 g ^{/ m} 2, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Example 1 having a basis weight of 81 g / m ² .

(Example 2)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.07 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with a long net paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached, and machine calendering was performed to prepare a printing paper of Example 2 having a basis weight of 81 g / m ² .

(Example 3)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.15 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with a long net paper machine, 1.5 g / m ^{2 of} phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² and machine calendering was performed to prepare a printing paper of Example 3 having a basis weight of 81 g / m ² .

Example 4
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.13 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with a long net paper machine, 1.5 g / m ^{2 of} phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² and machine calendering was performed to prepare a printing paper of Example 4 having a basis weight of 81 g / m ² .

(Example 5)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.08 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5 g / m ^{2 of} phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Example 5 having a basis weight of 81 g / m ² .

(Example 6)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached to 2.0 g / m ² and machine calendering was performed to prepare a printing paper of Example 6 having a basis weight of 52 g / m ² .

(Example 7)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² and machine calendering was performed to prepare a printing paper of Example 7 having a basis weight of 90 g / m ² .

(Example 8)
Pulp slurry consisting of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of kaolin (New Clay, Engelhard) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfuric acid band, alkyl ketene dimer type sizing agent (AS -263, manufactured by Seiko PMC Co., Ltd.), made with a long paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press, polydimethylcondensate-epichlorohydrin polycondensation A product (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Example 8 having a basis weight of 81 g / m ² .

Example 9
Pulp slurry consisting of 100 parts of LBKP having a freeness of 380 ml csf, 20 parts of Taipei W-10 (titanium oxide, manufactured by Ishihara Sangyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfuric acid band, alkyl ketene dimer type size 0.1 parts of an agent (AS-263, manufactured by Seiko PMC Co., Ltd.) was added to make a paper with a long paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press machine, dimethylamine- An epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Example 9 having a basis weight of 81 g / m ² .

(Example 10)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. A printing paper of Example 10 having a basis weight of 81 g / m ² was prepared by depositing calcium chloride at 2.0 g / m ² and machine calendering.

(Example 11)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. A printing paper of Example 11 having a basis weight of 81 g / m ² was prepared by depositing calcium nitrate at 2.0 g / m ² and machine calendering.

Example 12
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. dimethylamine - epichlorohydrin polycondensate (jet fix 5052, Satoda Kako Co., Ltd.) 1.0 g / ^{m 2,} calcium nitrate 1.0 g / ^{m 2} adhered to, the basis weight of 81 g / ^{m 2} by a machine calendering treatment The printing paper of Example 12 was produced.

(Example 13)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Polyethyleneimine (Epomin, manufactured by Nippon Shokubai Co., Ltd.) was attached to 2.0 g / m ² and machine calendering was performed to prepare a printing paper of Example 13 having a basis weight of 81 g / m ² .

(Example 14)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene dimeric sizing agent was added (AS-263, Seiko PMC Corporation) 0.1 parts by papermaking with a Fourdrinier paper machine, size press one side per phosphorylated starch in apparatus 1.5 g ^{/ m} 2, A printing paper of Example 14 having a basis weight of 81 g / m ² was prepared by depositing magnesium sulfate at 2.0 g / m ² and machine calendaring.

(Example 15)
A pulp slurry consisting of 100 parts of LBKP having a freeness of 380 ml csf, 13 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 parts of amphoteric starch, 0.8 parts of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, Satoda Chemical Co., Ltd.) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Example 15 having a basis weight of 81 g / m ² .

(Example 16)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 32 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene dimeric sizing agent was added (AS-263, Seiko PMC Corporation) 0.1 parts by papermaking with a Fourdrinier paper machine, size press one side per phosphorylated starch in apparatus 1.5 g ^{/ m} 2, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached, and machine calendaring was performed to produce a printing paper of Example 16 having a basis weight of 81 g / m ² .

(Example 17)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 0.08 g / m ² and machine calendering was performed to prepare a printing paper of Example 17 having a basis weight of 81 g / m ² .

(Example 18)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 0.12 g / m ² , and machine calendering was performed to produce a printing paper of Example 18 having a basis weight of 81 g / m ² .

(Example 19)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. dimethylamine - epichlorohydrin polycondensate (jet fix 5052, Satoda Kako Co., Ltd.) was a 3.8 g / ^{m 2} is deposited to produce a printing paper of example 19 having a basis weight of 81 g / ^{m 2} by a machine calendering treatment.

(Example 20)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene dimeric sizing agent was added (AS-263, Seiko PMC Corporation) 0.1 parts by papermaking with a Fourdrinier paper machine, size press one side per phosphorylated starch in apparatus 1.5 g ^{/ m} 2, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was adhered to 4.2 g / m ² , and machine calendering was performed to prepare a printing paper of Example 20 having a basis weight of 81 g / m ² .

(Example 21)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.1 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC), 6.5 parts dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) Papermaking was carried out, and 1.5 g / m ^{2 of} phosphate esterified starch was adhered to one side with a size press machine, and machine calendering was performed to prepare a printing paper of Example 21 having a basis weight of 81 g / m ² .

(Example 22)
<Preparation of base paper 1>
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.1 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using long paper machine, attach 1.5g / m ² phosphate esterified starch per side with size press. The base paper 1 was produced by machine calendar processing.
<Preparation of printing paper 22>
On the above base paper 1, dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) is coated on both sides using an air knife coater so that the coating amount is 2.0 g / m ² per side. Dry using a hot air dryer. After drying, calendering was performed using a soft calender to prepare a printing paper of Example 22 having a basis weight of 81 g / m ² .

(Comparative Example 1)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) 0.17 part was added, paper making was carried out with a long net paper machine, 1.5 g / m ^{2 of} phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached, and machine calendering was performed to prepare a printing paper of Comparative Example 1 having a basis weight of 81 g / m ² .

(Comparative Example 2)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.06 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with a long net paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached, and machine calendaring was performed to prepare a printing paper of Comparative Example 2 having a basis weight of 81 g / m ² .

(Comparative Example 3)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.04 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5g / m ² phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 0.03 g / m ² and machine calendering was performed to prepare a printing paper of Comparative Example 3 having a basis weight of 81 g / m ² .

(Comparative Example 4)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.03 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5g / m ^{2 of} phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached, and machine calendaring was performed to prepare a printing paper of Comparative Example 4 having a basis weight of 81 g / m ² .

(Comparative Example 5)
A pulp slurry consisting of 100 parts of LBKP having a freeness of 380 ml csf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.14 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 0.8 g / m ² and machine calendering was performed to prepare a printing paper of Comparative Example 5 having a basis weight of 81 g / m ² .

(Comparative Example 6)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) 0.18 part was added, paper making was carried out with a long net paper machine, 1.5 g / m ^{2 of} phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached, and machine calendering was performed to prepare a printing paper of Comparative Example 6 having a basis weight of 81 g / m ² .

(Comparative Example 7)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.04 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5g / m ² phosphate esterified starch per side with a size press machine, Dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached to 0.01 g / m ² , and machine calendering was performed to prepare a printing paper of Comparative Example 7 having a basis weight of 81 g / m ² .

(Comparative Example 8)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.02 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using a long net paper machine, 1.5 g / m ² phosphate esterified starch per side with a size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satoda Chemical Co., Ltd.) was attached, and machine calendering was performed to prepare a printing paper of Comparative Example 8 having a basis weight of 81 g / m ² .

(Comparative Example 9)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.2 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with long net paper machine, 1.5g / m ² phosphate esterified starch per side with size press machine, 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was attached, and machine calendering was performed to prepare a printing paper of Comparative Example 9 having a basis weight of 81 g / m ² .

(Comparative Example 10)
A pulp slurry consisting of 100 parts of LBKP having a freeness of 380 mlcsf, 8 parts of Tamapearl TP-121 (spindle-shaped light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. 2.0 g / m ^{2 of} dimethylamine-epichlorohydrin polycondensate (Jetfix 5052, manufactured by Satorita Chemical Co., Ltd.) was applied, and machine calendering was performed to prepare a printing paper of Comparative Example 10 having a basis weight of 81 g / m ² .

(Comparative Example 11)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.1 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper using long paper machine, attach 1.5g / m ² phosphate esterified starch per side with size press. Then, a machine calendar process was performed to prepare a printing paper of Comparative Example 11 having a basis weight of 81 g / m ² .

(Comparative Example 12)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. A printing paper of Comparative Example 12 having a basis weight of 81 g / m ² was prepared by depositing 2.0 g / m ^{2 of} sodium chloride and machine calendering.

(Comparative Example 13)
A pulp slurry composed of 100 parts of LBKP having a freeness of 380 mlcsf, 20 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as a filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.) (0.1 part) was added, and the paper was made with a long paper machine, and the phosphoric esterified starch was 1.5 g / m ² per side with a size press. An anionic acrylic resin (Boncoat AN-680, manufactured by DIC) was attached to 2.0 g / m ² , and machine calendering was performed to prepare a printing paper of Comparative Example 13 having a basis weight of 81 g / m ² .

(Comparative Example 14)
A pulp slurry composed of 100 parts of LBKP having a freeness of 400 mlcsf, 15 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.05 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with long net paper machine, 1.25 g / m ^{2 of} oxidized starch per side with size press machine, calcium chloride A printing paper of Comparative Example 14 having a basis weight of 84 g / m ² was prepared by applying 1.0 g / m ² and machine calendering.

(Comparative Example 15)
A pulp slurry composed of 100 parts of LBKP having a freeness of 400 mlcsf, 15 parts of Tamapearl TP-121 (spindle light calcium carbonate, manufactured by Okutama Kogyo Co., Ltd.) as filler, 0.8 part of amphoteric starch, 0.8 part of sulfate band, alkyl ketene Add 0.05 part of dimer type sizing agent (AS-263, manufactured by Seiko PMC Co., Ltd.), make paper with long net paper machine, 1.25 g / m ^{2 of} oxidized starch per side with size press machine, calcium chloride 0.5 g / ^{m 2,} dimethylamine - epichlorohydrin polycondensate (jet fix 5052, Satoda Kako Co., Ltd.) was a 0.5 g / ^{m 2} is deposited, Comparative example 15 having a basis weight of 84 g / ^{m 2} by a machine calendering treatment Printing paper was prepared.

<Measurement of opacity>
The opacity of the printing paper was measured in accordance with the opacity measurement method defined in JIS P 8149.

<Measurement of squeecht size>
In accordance with the method for measuring the degree of sizing of stipulated in JIS P 8122, the degree of sizing of the printing paper was measured.

<Measurement of 10-second Cobb size>
In accordance with the Cobb water absorption measurement method defined in JIS P 8140, the 10-second Cobb sizing degree of the printing paper was measured. The contact time between the measurement solvent and the printing paper was 10 seconds, and measurement was performed with pure water as the measurement solvent.

<Evaluation of suitability for offset printing>
With an offset form rotary press manufactured by Miyakoshi, printing speed: 150 m / min, ink used: T & K TOKA UV best cure ink and gold red, UV irradiation amount: 6000 m under the condition of 2 kW, and blanket piling occurs after printing The situation and the state of the printed sample were determined by visual evaluation. In the present invention, if the evaluation is 3 to 5, the printing paper has an offset printability.
5: Extremely good.
4: Good.
3: Range in which there is no practical problem.
2: Defect.
1: Extremely bad.

<Evaluation of ink absorbency (water-based dye ink) for industrial inkjet printers>
Using an industrial inkjet printer MJP20C manufactured by Miyakoshi Co., Ltd., an evaluation image was printed at 6000 m at 150 m / min with an aqueous dye ink. A solid color pattern of 7 colors (black, cyan, magenta, yellow) and double colors (red, green, blue) in 3 colors other than black, with 2cm x 2cm squares and no horizontal gaps Printing was done by recording side by side. It was determined by visual evaluation from the viewpoint of bleeding of each color solid print image portion and boundary print image portion. In this invention, if it is evaluation of 3-5, a printing paper shall be excellent in the ink absorptivity with respect to the industrial inkjet printer which uses a water-based dye ink.
5: There is no blur at the color boundary.
4: There is almost no bleeding at the boundary of the color.
3: Although the color boundary is blurred, the boundary can be clearly identified.
2: The boundary between the colors is not clear, and the adjacent colors have moved slightly beyond the boundary.
1: The boundary of each color is not known, and bleeding to adjacent colors is large.

<Evaluation of color density uniformity (aqueous pigment ink) for industrial inkjet printers>
Using an industrial inkjet printer Prosper 5000XL Press manufactured by Kodak Co., Ltd., an evaluation image was printed at 6000 m at 75 m / min with an aqueous pigment ink. Black, cyan, magenta, yellow solid colors and other three-color inks other than black, a total of seven colors (red, green, blue) in a solid pattern of 3 colors x 3 cm square with no gaps in a horizontal row Printing was done by recording side by side. The uniformity of the color density of each solid color portion of the printed portion was determined by visual evaluation. In the present invention, if the evaluation is 3 to 5, the printing paper is excellent in color density uniformity with respect to an industrial inkjet printer using an aqueous pigment ink.
5: The color density is uniform.
4: The density is slightly non-uniform depending on the color.
3: The color density is slightly uneven.
2: The color density is partially uneven.
1: The color density is non-uniform throughout the printed portion.

<Evaluation of the ability of ink to reverse through industrial inkjet printers>
For water-based dye ink, use an industrial inkjet printer MJP20C manufactured by Miyakoshi Co., Ltd., and print an evaluation image of 6000 m at 150 m / min. For water-based pigment ink, use Kodak industrial inkjet printer Prosper 5000XL Press. The evaluation image was printed at 6000 m at 75 m / min. Printing was performed by a method of recording a black solid print pattern in 10 cm × 10 cm square. The whiteness is measured from the opposite side of the black solid printing portion using the whiteness measuring method defined in JIS P8148, and “whiteness of white portion without printing (optical%)” — “black solid printing portion The degree of whiteness (optical%) was evaluated for ink penetration of printing paper. The whiteness was measured by using a PF-10 made by Nippon Denshoku Co., Ltd. and placing a sample on a standard plate under the conditions of UV cut. In this invention, if it is evaluation of 3-5, a printing paper shall be excellent in the back-through prevention property of the ink with respect to an industrial inkjet printer.
5: Less than 10 optical%.
4: 10 optical% or more and less than 13 optical%.
3: 13 optical% or more and less than 16 optical%.
2: 16 optical% or more and less than 19 optical%.
1: 19% optical or more.

  In Table 1, the evaluation result of Examples 1-22 and Comparative Examples 1-15 is shown.

  From Table 1, the printing paper of each example corresponding to the present invention has offset printing suitability, and has ink absorbability and ink back-through suppression with respect to an industrial ink jet printer using a water-based dye ink. It can be seen that the color density uniformity and the ink back-through inhibiting property are excellent for an industrial inkjet printer using pigment ink.

  On the other hand, from Table 1, the effect of the present invention cannot be obtained in each comparative example that does not satisfy the conditions of the present invention.

Claims (3)

Contains at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt (excluding the sulfate band from the water-soluble polyvalent cation salt ), and the addition amount of the alkyl ketene dimer type sizing agent is pulp 100 and 0.15 parts by mass or more 0.07 parts by weight with respect to per mass unit, a basis weight of 50 g / ^{m 2} or more 90 g / ^{m 2} or less, opacity conforming to JIS P 8149 is 89.0% or more , Steffich sizing degree according to JIS P 8122 is 5 seconds or more and 25 seconds or less, 10 s Cobb sizing degree according to JIS P 8140 is 20 g / m ² or more and 100 g / m ² or less, and 10 s Cobb with respect to Steecht sizing degree. The ratio of sizing degree is 1 or more and 15 or less, and the cationic resin and the water-soluble polyvalent cation salt (however, the sulfate band is excluded from the water-soluble polyvalent cation salt ) Non-coated paper type printing paper for industrial ink jet printers, wherein the content of at least one compound selected from (2) is from 0.2 g / m ^{2 to} 8.0 g / m ² . The method of containing at least one compound selected from a cationic resin and a water-soluble polyvalent cation salt (provided that a sulfate band is excluded from the water-soluble polyvalent cation salt) is a size press. Non-coated paper type printing paper for industrial inkjet printers. The cationic resin is dimethylamine - a epichlorohydrin polycondensate, according to claim 1 or 2 is a calcium salt the water-soluble polyvalent cation salt may be dissolved 1 mass% or more to 20 ° C. Water Non-coated paper type printing paper for industrial inkjet printers.