Mitsubishi Paper Mills Limited

Masanori Nagoshi

Koji Idei

Toru Kaneko

Jun Urasaki

Tetsuya Nishi

Kazutoshi Iida

Hiroshi Matsuda

Hiroshi Ikeda

Hideki Takada

Makoto Kato

Koji Igarashi

Hiroo Kaji

Hidetsugu Oda

Masayuki Takishiro

Yuri Watanabe

Terufumi Yamaguchi

A printing paper having a base paper and an outermost coating layer is provided, and satisfies at least one of the following characteristics (I), (II) and (III): (I) when an aqueous solution having a surface tension of 20 mN/m is dropped on the side having the outermost coating layer of the printing paper, a contact angle between the droplet and the outermost coating layer is 40&#xb0; or more and 65&#xb0; or less; (II) for the side having the outermost coating layer of the printing paper, a transfer amount of an aqueous solution having a surface tension of 20 mN/m at a contact time of 1 second as determined by the Bristow method is 5.0 ml/mor more and 12.0 ml/mor less; and (III) on the surface of the outermost coating layer of the printing paper, a maximum peak value of specular reflection light quantity of a point image is 2,000 or more and 30,000 or less.

Printing paper

A coated paper for industrial inkjet printing presses that achieves excellent uniformity in color densities and ink absorbability, has the capability of suppressing strike-through of inks, and achieves excellent paper feeding characteristics is provided. The paper comprises: a base paper, and a coating layer containing at least one selected from the group consisting of a cationic resin and a water-soluble polyvalent cationic salt, and a pigment containing kaolin, on the base paper. The coated paper surface on the side where the coating layer is located has an arithmetic mean roughness (Ra) of is 4.5 &#x3bc;m to 7.5 &#x3bc;m, and has 1 to 350 protruding parts per 1.0 square centimeter, wherein a protruding part has a maximum width of 10 &#x3bc;m to 100 &#x3bc;m measured using a photographed image of the coated paper surface taken by magnifying 50 times using an electron microscope.

Coated paper for industrial inkjet printing presses and method of producing the same

The present invention relates to a coated printing paper for an industrial inkjet printing press having a base paper, and at least two layers of coating layers arranged on at least one surface of the base paper; a first coating layer that is located at a farthest position from the base paper among the at least two layers of coating layers containing a pigment and a binder as main components, a peak existing in the range of 0.010 &#x3bc;m to 0.030 &#x3bc;m in a pore size distribution curve thereof, at least one type of the pigment thereof being ground calcium carbonate, and the content thereof being 60 parts by mass or more per 100 parts by mass total of all pigment(s) contained in the first coating layer; and a second coating layer that is in contact with the first coating layer among the at least two layers of coating layers containing a pigment and a binder as main components, and a peak existing in the range of 0.080 &#x3bc;m to 0.300 &#x3bc;m in a pore size distribution curve thereof.

Coated printing paper for industrial inkjet printing press and method of producing printed material

The present invention provides a lightweight coated printing paper for an industrial inkjet printing press, having a base paper, and one or more coating layers being disposed on at least one surface of the base paper and containing a pigment and a binder, wherein

Lightweight coated printing paper for industrial inkjet printing press

Provided is a printing coated paper which is advantageous not only in that the coated paper has offset printability and causes no mottling in the printed area even in ink jet printing, but also in that the coated paper exhibits excellent rubbing resistance with respect to the printed area and excellent print density of a dye ink. The task of the present invention is achieved by a printing coated paper having a coating layer comprised mainly of a pigment and a binder formed on at least one side of a base paper, wherein the base paper is a treated base paper which has been subjected to size press using a treatment solution containing at least one member selected from a cationic resin and a water-soluble multivalent cation salt, wherein the total applied amount per each side of the at least one member selected from a cationic resin and a water-soluble multivalent cation salt, in terms of the solids content, is in the range of from 0.1 to 5.0 g/m, and wherein the at least one pigment in the coating layer is ground calcium carbonate having an average particle diameter of 0.1 to 0.28 &#x3bc;m, wherein the amount of the ground calcium carbonate having an average particle diameter of 0.1 to 0.28 &#x3bc;m contained in the coating layer is in the range of 60 parts by mass or more, relative to 100 parts by mass of the total of the pigment(s) in the coating layer.

Printing coated paper and method for producing a printed material using the same

Printing paper for an industrial rotary inkjet printing press is provided that has superior printability with respect to an offset printing press, and has superior color density uniformity, inhibition of ink strike-through and dot reproducibility with respect to an industrial rotary inkjet printing press using water-based pigment ink. The printing paper for an industrial rotary inkjet printing press comprises a base paper and at least one coating layer containing pigment, binder and water-soluble polyvalent cation salt on at least one side of the base paper, wherein at least one of the pigment is kaolin having an average particle diameter of 0.20 &#x3bc;m to 1.50 &#x3bc;m, and the content of the kaolin in the coating layer is 50 parts by weight or more based on 100 parts by weight of the pigment in the coating layer, the content of the water-soluble polyvalent cation salt in the coating layer is 1.0 parts by weight to 6.0 parts by weight based on 100 parts by weight of the pigment in the coating layer, and the surface resistivity on the coating layer side of the printing paper in an environment at 23&#xb0; C. and 50% RH as determined basically in compliance with JIS K 6911:2006 is 2.0&#xd7;10&#x3a9; to 5.0&#xd7;10&#x3a9;.

Printing paper for industrial rotary inkjet printing press and method for producing printed material

The present invention provides coated printing paper for industrial inkjet printing presses comprising base paper and, formed on at least one surface of the base paper, a coating layer containing a pigment and a binder as major components, wherein the base paper contains precipitated calcium carbonate which is aggregates of spindle-like precipitated calcium carbonate having an average minor-axis length of 0.3 &#x3bc;m to 0.4 &#x3bc;m and a ratio of average major-axis length/average minor-axis length of 2.0 to 7.0 and which has an average secondary particle diameter of 3.0 &#x3bc;m to 5.5 &#x3bc;m, and further contains at least one material selected from the group consisting of a cationic resin and a water-soluble salt of a polyvalent cation, and the coating layer contains ground calcium carbonate having an average particle diameter of 0.1 &#x3bc;m to 0.28 &#x3bc;m in an amount of 60 parts by mass or greater based on 100 parts by mass of the total pigment contained in the coating layer.

Coated printing paper for industrial inkjet printing press

A task of the present invention is to provide a coated printing paper for an industrial inkjet printing press, which has printability for a conventional printing press for use in, e.g., offset printing, and which has printability that can cope with the printing speed of an industrial inkjet printing press. An embodiment of the present invention is a coated printing paper for an industrial inkjet printing press, having a support; and, on at least one surface of the support, a coating layer containing at least a binder, a cationic compound, and ground calcium carbonate which, in a particle size distribution curve thereof, has at least one peak and has a half band width of 0.25 &#x3bc;m or less with respect to the maximum peak, and which has an average particle diameter of 0.10 to 0.28 &#x3bc;m.

The present invention provides a coated printing paper which is for use in an industrial inkjet printing machine and which has printability that can accommodate the printing speed of an industrial inkjet printing machine while having printability for a conventional printing machine such as an offset press. The present invention provides a coated printing paper for an industrial inkjet printing machine, which comprises: a base paper at least containing a boric acid compound or a borate compound; and on the base paper, a coating layer at least containing polyvinyl alcohol and ground calcium carbonate having a mean particle diameter of 0.1 &#x3bc;m to 0.28 &#x3bc;m.

Coated printing paper for industrial inkjet printer and method for manufacturing printed products using the same

A coated paper having a base paper and at least two coating layers, a first coating layer and a second coating layer, provided on at least one surface of the base paper. The first coating layer is provided on the base paper and contains an organic pigment, a cationic compound, a binder, and a dogtooth-shaped precipitated calcium carbonate having a minor axis of 0.1-0.5 &#x3bc;m and a major axis of 0.5-2.5 &#x3bc;m. The second coating layer is provided on the first coating layer and contains at least an inorganic ultrafine particle that is selected from hydrated alumina, gas phase process silica, pulverized wet-process silica, and colloidal silica, and that has a mean particle size of 330 nm or less. The paper has a surface pH of from 5.0 to 7.5, and the coated surface coated with the second coating layer has a 75-degree gloss value of 45% or more.

Coated paper for printing by industrial ink jet printing machine

The present invention provides a method for manufacturing printed products using an industrial inkjet printer and the method does not generate soiling of the images and printing unevenness. The present invention provides a method for manufacturing a printed product using an industrial inkjet printer, comprising: a step for printing on coated printing paper using an industrial inkjet printer, wherein the printing speed of the industrial inkjet printer is 60 m/min or more, the coated printing paper contains a support and a coating layer, and the coating layer contains ground calcium carbonate, having a cumulative frequency of a particle diameter of 1.0 &#x3bc;m or less in a volume-based particle size distribution of 95% by volume or more and a mean particle diameter of 0.1 &#x3bc;m to 0.28 &#x3bc;m, at 60% by mass or more of the total amount of pigment in the coating layer.

Method for manufacturing printed products using industrial inkjet printer

The invention provides coated printing paper having base paper and on at least one surface of the base paper, a coating layer containing a pigment and a binder as main components, wherein the base paper contains calcium carbonate, the coating layer contains ground calcium carbonate as a pigment in an amount of 50 parts by mass or more relative to 100 parts by mass of the total of the pigment(s) in the coating layer, the base paper and/or the coating layer contains a calcium compound other than calcium carbonate, and the content of calcium derived from the calcium compound is 3 mmol to 60 mmol, both inclusive, in terms of calcium ions per 1 mof the base paper and/or the coating layer.

Coated printing paper and method for forming printed images

The invention provides lightweight coated paper having good offset printability. The invention provides lightweight coated paper having good printability in commercial printing utilizing the ink jet recording system. The lightweight coated paper of the invention includes base paper, and one or more coating layers disposed on at least one side of the base paper. The coating layer includes a pigment and a binder. The total coating weight of the coating layer(s) is not more than 7.5 g/mper side of the base paper. The coating layer contains a polycondensate of an aliphatic monoamine or an aliphatic polyamine and an epihalohydrin compound, and a water-soluble polyvalent cation salt. The content of the water-soluble polyvalent cation salt in the coating layer is 0.3 g/mto 1.0 g/mper side of the base paper. The content of the polycondensate of an aliphatic monoamine or an aliphatic polyamine and an epihalohydrin compound in the coating layer is 15 mass % to less than 100 mass % relative to the content of the water-soluble polyvalent cation salt.

Lightweight coated paper and print production method using the same

The present invention provides plain printing paper comprising

Printing paper and method for forming printed images

The object of the present invention is to provide a coated printing paper used for ink jet printing machines, which has an ink fixing property and ink absorption property corresponding to ink jet printing, which inhibits poor dot diffusion, and which is excellent in abrasion resistance property of printed portions. According to the present invention, provided is a coated printing paper comprising a base paper, an undercoating layer which is applied on at least one surface of the base paper and contains a pigment and a binder, and one or more coating layers on the undercoating layer, wherein the base paper contains at least one selected from a cationic resin and a multivalent cation salt; the uppermost coating layer contains at least a colloidal silica; and the 75&#xb0; gloss according to JIS Z8741 of the surface of the uppermost coating layer is 40% or more.

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Tokyo, Japan

Masanori Nagoshi