Printing paper and method for producing printed material

Patent metadata

Field	Value
Publication number	US-9731497-B2
Application number	US-201615045498-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Mar 18, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Printing paper is provided that is able to inhibit the occurrence of cockling and wrinkling during printing and inhibit the occurrence of curling after printing when cut into sheets in the case where inkjet printing is carried out in a rotary inkjet printing press while tension is applied from the time the printing paper is rolled out until it is taken up. The printing paper comprises a base paper and a coating layer containing a pigment and a binder on at least one side of the base paper, wherein an ash content of the base paper is 20% by weight to 30% by weight, and specific tensile strength of the printing paper in the CD direction is 9.0 N·m/g or less, and the ratio of (specific tensile strength in the MD direction)/(specific tensile strength in the CD direction) is 1.9 to 2.3, wherein the specific tensile strength is as determined basically in compliance with JIS P 8113:2006.

First claim

What is claimed is:

1. Printing paper comprising:
a base paper and
a coating layer containing a pigment and a binder on at least one side of the base paper; wherein,
an ash content of the base paper is 20% by weight to 30% by weight, and
specific tensile strength of the printing paper in the CD direction is 9.0 N·m/g or less, and the ratio of (specific tensile strength in the MD direction)/(specific tensile strength in the CD direction) is 1.9 to 2.3, wherein the specific tensile strength is as determined basically in compliance with JIS P 8113:2006.

2. The printing paper according to claim 1 , wherein the base paper contains at least leaf bleached kraft pulp (LBKP) and needle bleached kraft pulp (NBKP) as pulp, and the relationship of the freeness of the LBKP and NBKP as determined basically in compliance with the “Canada Standard Freeness Method” of JIS P 8121-2:2012 is such that (LBKP freeness)<(NBKP freeness).

3. The printing paper according to claim 1 , wherein the coating layer contains a water-soluble polyvalent cation salt.

4. The printing paper according to claim 2 ; wherein the coating layer contains a water-soluble polyvalent cation salt.

5. A method for producing a printed material, comprising the steps of:
obtaining the printing paper according to claim 1 , and
obtaining a printed material by printing on the printing paper with an industrial rotary inkjet printing press.

6. A method for producing a printed material, comprising the steps of:
obtaining the printing paper according to claim 2 , and
obtaining a printed material by printing on the printing paper with an industrial rotary inkjet printing press.

7. A method for producing a printed material, comprising the steps of:
obtaining the printing paper according to claim 3 , and
obtaining a printed material by printing on the printing paper with an industrial rotary inkjet printing press.

8. A method for producing a printed material, comprising the steps of:
obtaining the printing paper according to claim 4 , and
obtaining a printed material by printing on the printing paper with an industrial rotary inkjet printing press.

Assignees

• Mitsubishi Paper Mills Ltd

Inventors

• Nishi Tetsuya

Classifications

• B41M5/508 Primary

  Supports · CPC title

• B41M5/5254

  characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title

• B41M5/52

  Macromolecular coatings · CPC title

• D21C9/10

  Bleaching {; Apparatus therefor} · CPC title

• B41M5/5245

  characterised by the use of polymers containing cationic or anionic groups, e.g. mordants · CPC title