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High-gram-weight double-sided coated paper capable of reducing pressure loss and preparation method thereof

A coated paper and double-sided technology, which is applied in the field of high-weight double-sided coated paper and its preparation, can solve the problems of affecting sales, natural gas waste, and poor paper feeding, so as to improve vehicle speed efficiency and time efficiency, and reduce pulp The effect of reducing the amount of material used and reducing the thickness

Active Publication Date: 2020-02-14
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of full-press mode requires a high thickness of coated paper, which causes the basis weight of the paper machine to exceed the standard seriously, resulting in the risk of customer complaints. In addition, most paper types are full-pressed with high gloss and high smoothness. The physical properties of the paper after pressing exceed the standard and the paper slips , resulting in sticking of printing paper and poor paper feeding, unable to meet customers' high-speed printing needs, seriously affecting sales
Comparing the full-pressure mode with the single-pressure mode, the 6 rubber rollers in the full-pressure calendering machine are wasted due to wear and tear, and the power and natural gas of the main drive are wasted.

Method used

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  • High-gram-weight double-sided coated paper capable of reducing pressure loss and preparation method thereof
  • High-gram-weight double-sided coated paper capable of reducing pressure loss and preparation method thereof
  • High-gram-weight double-sided coated paper capable of reducing pressure loss and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing high-grammage double-sided coated paper with reduced pressure loss, comprising the following steps:

[0031] S1: Take kraft softwood pulp, bleached kraft hardwood pulp and bleached chemical thermomechanical pulp, the weight ratio is 10:60:30, the freeness of kraft softwood pulp after beating is 440ml, and the bulk thickness is 1.3cm 3 / g; bleached kraft hardwood pulp has a freeness of 405ml and a bulk of 1.3cm after beating 3 / g; bleached chemical thermomechanical pulp after beating has a freeness of 350ml and a bulk of 2.8cm 3 / g; mixed to form a slurry mixture;

[0032] S2: Add ground calcium carbonate and positive starch to the slurry mixture in step S1, mix thoroughly, control the ash content to 12-14%, and obtain raw paper pulp, which includes 90% of the slurry mixture by weight percentage , ground calcium carbonate 8.5% and positive starch 1.5%;

[0033] S3: Use the base paper pulp obtained in step S2 to produce base paper, and the base p...

Embodiment 2

[0040] A method for preparing high-grammage double-sided coated paper with reduced pressure loss, comprising the following steps:

[0041] S1: Take kraft softwood pulp, bleached kraft hardwood pulp and bleached chemical thermomechanical pulp, and mix them at a weight ratio of 3:50:20 to form a slurry mixture;

[0042] In step S1, after beating, the kraft softwood pulp has a freeness of 380ml and a bulk of 1.25cm 3 / g; bleached kraft hardwood pulp has a freeness of 350ml and a bulk of 1.25cm after beating 3 / g; bleached chemical thermomechanical pulp after beating has a freeness of 260ml and a bulk of 2.4cm 3 / g;

[0043] S2: Add ground calcium carbonate and positive starch to the slurry mixture in step S1, mix thoroughly, control the ash content to 12-14%, and obtain raw paper pulp, which includes 90% of the slurry mixture by weight percentage , ground calcium carbonate 8.5% and positive starch 1.5%;

[0044] S3: Use the base paper pulp obtained in step S2 to produce base ...

Embodiment 3

[0051] A method for preparing high-grammage double-sided coated paper with reduced pressure loss, comprising the following steps:

[0052] S1: Take kraft softwood pulp, bleached kraft hardwood pulp and bleached chemical thermomechanical pulp, and mix them at a weight ratio of 10:70:40 to form a slurry mixture;

[0053] In step S1, after beating, the kraft softwood pulp has a freeness of 450ml and a bulk of 1.35cm 3 / g; bleached kraft hardwood pulp has a freeness of 420ml and a bulk of 1.35cm after beating 3 / g; bleached chemical thermomechanical pulp after beating has a freeness of 360ml and a bulk of 3.2cm 3 / g;

[0054] S2: Add ground calcium carbonate and positive starch to the slurry mixture in step S1, mix thoroughly, control the ash content to 12-14%, and obtain raw paper pulp, which includes 91% of the slurry mixture by weight percentage , ground calcium carbonate 7% and positive starch 2%;

[0055] S3: Use the base paper pulp obtained in step S2 to produce base pap...

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Abstract

The invention provides high-gram-weight double-sided coated paper capable of reducing pressure loss and a preparation method thereof. Sulfate softwood pulp, bleached sulfate hardwood pulp, bleached chemithermomechanical pulp, ground calcium carbonate and positive starch are used, the reasonable ratio and the forming and surface structure of raw paper and other properties are controlled, and a basis is established for the production of high-quality double-sided coated paper; a base coat, a middle coat and a surface coat adopt different raw material ratios, and the sizing process is reasonably controlled, so that the paper surface keeps reasonable microcosmic roughness, and reasonable gloss contrast is achieved. According to the prepared double-sided coated paper, the defects of high pressure loss, high thickness required for coated paper, high pulp consumption and the like due to adoption of an eight-pressure-zone mode for calendering for paper with 170 gsm or above at present are overcome, the operation of a paper machine is improved, and the quality of the paper is improved.

Description

technical field [0001] The invention relates to the technical field of coated paper, in particular to a high-weight double-sided coated paper with reduced pressure loss and a preparation method thereof. Background technique [0002] The desk calendar printing on the market mainly uses cardboard, offset paper, and coated paper. Because coated paper has the characteristics of smoother paper surface, high smoothness, and good gloss, it is more popular among customers than other paper products. of favor. Especially in recent years, the demand for high stiffness and high bulk coated paper in the desk calendar paper market is also growing. If the same high-quality coated paper is provided instead of white cardboard, the market share will increase. [0003] Because the coated paper produced by the paper machine needs to go through super calendering to improve the gloss, roughness and smoothness, the full pressure (8NIP) mode is selected, the pressure loss is large, and the copper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H11/04D21G1/00D21H23/72D21H23/34
CPCD21G1/00D21H11/04D21H23/34D21H23/72D21H27/00
Inventor 蔡亮
Owner HAINAN JINHAI PULP & PAPER