Base paper for paper container and laminate sheet for paper container using same

A technology for laminating sheets and paper containers, which is applied in the field of paper boards, can solve problems such as strength reduction, and achieve the effects of inhibiting damage, excellent processing suitability, and high printing suitability

Inactive Publication Date: 2012-03-07
NIPPON PAPER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the paper made by multi-layer paper is used as the base paper for the paper container as mentioned above, the strength between the paper layers is lower than that of the single-layer paper, so the peeling between the paper layers becomes a problem during the forming process.

Method used

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  • Base paper for paper container and laminate sheet for paper container using same
  • Base paper for paper container and laminate sheet for paper container using same
  • Base paper for paper container and laminate sheet for paper container using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] (Paper material slurry A for the outer layer)

[0109]Coniferous bleached kraft pulp (NBKP) with a Canadian Standard Freeness (CSF) of 500ml and hardwood bleached kraft pulp (LBKP) with a CSF of 450ml were blended at a mass ratio of 40 / 60 as raw material pulp. In the raw material pulp slurry, 0.3 parts by mass of polyacrylamide with a molecular weight of 2.5 million as a dry paper strength enhancer is added relative to 100 parts by mass of the total raw material pulp (absolutely dry pulp mass), and alkane as a sizing agent in the pulp Add 0.5 parts by mass of base ketene dimer relative to 100 parts by mass of total raw material pulp (absolutely dry pulp mass), and add polyamide epichlorohydrin resin as a wet paper strength reinforcing agent relative to 100 parts by mass of total raw material pulp ( dry pulp mass) after adding 0.1 parts by mass, adjust the pH to 7.5 with sodium hydroxide, and use it as paper stock slurry A for the outer layer.

[0110] (Paper material s...

Embodiment 2

[0114] In addition to mixing NBKP and LBKP at a mass ratio of 50 / 50, the outer layer 1 and outer layer 2 use the outer layer paper slurry A1 made in the same way as the outer layer paper slurry A, with a grammage of 79g / m 2 Preparation, except that the inner layer 1 uses paper material slurry a for the inner layer, with a gram weight of 159g / m 2 Except preparation, same as embodiment 1, obtain grammage 320g / m 2 , Density 0.75g / cm 3 paper container base paper.

Embodiment 3

[0116] In addition to adding 0.3 parts by mass of the alkyl ketene dimer as the pulp internal sizing agent relative to 100 parts by mass of the total raw material pulp (absolute dry pulp mass), adding aluminum sulfate to 100 mass parts of the total raw material pulp (absolute dry pulp mass) mass) except adding 0.08 parts by mass, the outer layer 1 and the outer layer 2 use the outer layer paper slurry A2 made in the same way as the outer layer paper slurry A1, with a grammage of 79g / m 2 Preparation, in addition to adding 0.3 mass parts of the alkyl ketene dimer as the pulp internal sizing agent relative to the total raw material pulp 100 mass parts (absolute dry pulp quality), adding aluminum sulfate relative to the total raw material pulp 100 mass parts (absolute dry pulp quality) dry pulp mass) addition of 0.08 parts by mass, the inner layer 1 uses the same inner layer paper stock slurry a1 made as the inner layer paper stock slurry a, with a grammage of 159g / m 2 Preparation...

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Abstract

Disclosed is a base paper for a paper container, on which a thermoplastic resin is laminated, having good processing suitability, high cross-sectional penetration resistance and good printing suitability. Specifically disclosed is a multilayer base paper for a paper container comprising an external layer, which is a paper layer located outermost, and an inner layer, which is a paper layer other than the outer layer, wherein the outer layer contains, in the starting pulp material thereof, 40 mass% or more of a softwood craft pulp, and the inner layer contains, in the starting pulp material thereof, 30 mass% or less of a softwood craft pulp.

Description

technical field [0001] The present invention relates to paper boards for forming paper containers. In particular, it relates to a base paper for paper containers obtained by multilayer papermaking, and a laminated sheet for paper containers obtained by laminating a thermoplastic resin layer on the base paper for paper containers. Background technique [0002] A typical paper container is printed on the surface of the paper, punched into a desired shape, and then bent and formed. [0003] When the content is food containing liquids such as beverages, water, or oil, paper containers require water resistance, oil resistance, etc., so a laminated sheet with a thermoplastic resin such as polyethylene laminated on the front and back of the base paper is used. The forming method is a usual method. At this time, a thermoplastic resin is used as a sealing layer, and it heat-melts and bonds and completes it. [0004] Water resistance, oil resistance, etc. are imparted to the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00B32B27/10B65D65/40D21H11/04
CPCB32B27/10B32B29/005B32B2307/50B32B2307/75B32B2439/00D21H11/04D21H27/30D21H27/38
Inventor 近藤登福永正明兼行民治郎
Owner NIPPON PAPER IND CO LTD
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