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Method for optimizing paper structure to improve performance of finished paper

A technology for structure improvement and paper making, applied in pulp beating method, pulp beating/refining method, paper making, etc., to improve paper performance and product quality

Active Publication Date: 2014-10-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, most of the current patents and literature reports focus on the use of various chemical additives or equipment improvement to improve paper performance, and there are few reports on improving paper performance by optimizing filler distribution.

Method used

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  • Method for optimizing paper structure to improve performance of finished paper
  • Method for optimizing paper structure to improve performance of finished paper

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Experimental program
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Effect test

Embodiment 1

[0031] The paper-forming filler content of present embodiment is 25%, comprises the following steps:

[0032] 1) Disintegration of pulp: fully disintegrate and dehydrate the chemical hardwood pulp to make a slurry with a final concentration of 10%;

[0033] 2) Refining: refining the prepared slurry, the refining concentration is 9%, and the final beating degree of the slurry after refining is 30°SR;

[0034] 3) Preparation of filler suspension: prepare calcium silicate filler suspension with a concentration of 10%, and fully stir and disperse;

[0035] 4) Papermaking of paper sheets: divide the slurry prepared in step 2) into three parts (upper, middle and lower layers), and dilute each part of the slurry to a concentration of 0.1%; The absolute dry mass ratio of the total amount of fibers in the slurry with a beating degree of 30°SR is 30:70, and the final paper-forming filler content meets the target paper-forming filler content of 25% by adding retention aids.

[0036] Ac...

Embodiment 2

[0041] The paper-forming filler content of present embodiment is 25%, comprises the following steps:

[0042] 1) Disintegration of pulp: fully disintegrate and dehydrate the chemical mechanical pulp to make a slurry with a final concentration of 12%;

[0043] 2) Refining: refining the prepared slurry, the refining concentration is 12%, and the final beating degree of the slurry after refining is 50°SR;

[0044] 3) Preparation of filler suspension: prepare a calcium carbonate filler suspension with a concentration of 15%, and fully stir and disperse;

[0045] 4) Papermaking of paper sheets: the prepared slurry in step 2) is divided into three parts (upper, middle and lower layers), and each part of the slurry is diluted to a concentration of 0.3%; The absolute dry mass ratio of the total amount of fibers in the slurry with a beating degree of 50°SR is 10:90, and the final paper-forming filler content meets the target paper-forming filler content of 25% by adding retention aid ...

Embodiment 3

[0048] The paper-forming filler content of present embodiment is 25%, comprises the following steps:

[0049] 1) Disintegration of pulp: fully disintegrate and dehydrate the chemical softwood pulp to make a slurry with a final concentration of 9%;

[0050] 2) Refining: refining the prepared slurry, the refining concentration is 9%, and the final beating degree of the slurry after refining is 28°SR;

[0051]3) Preparation of filler suspension: prepare calcium carbonate filler suspension with a concentration of 20%, and fully stir and disperse;

[0052] 4) Papermaking of paper sheets: the prepared slurry in step 2) is divided into three parts (upper, middle and lower layers), and each part of the slurry is diluted to a concentration of 0.3%; The absolute dry mass ratio of the total amount of fibers in the slurry with a beating degree of 50°SR is 40:60, and the final paper-forming filler content meets the target paper-forming filler content of 25% by adding retention aids.

[0...

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Abstract

The invention discloses a method for optimizing a paper structure to improve the performance of finished paper. The method comprises the steps of size degradation of paper pulp, defibrination, preparation of filler suspension liquid and manufacturing of paper with the pulp, wherein when the paper is manufactured with the pulp, three paper layers are combined for manufacturing, and the concentration factor Fc of filler in the paper is regulated to achieve improvement on bulk, air permeability, physical strength and optical performance of the filled paper when the content of the filler is fixed. The distribution factor of the filler is optimized to improve the performance of the finished paper, distribution of the filler in the paper structure is adjusted to play the advantages of the filler to the maximum extent, and the purpose of improving the performance of the finished paper is achieved. The method is simple and easy to operate, the performance of the target finished paper is adjusted according to needs, the performance of the finished paper is improved in a modern paper making machine by optimizing the concentration factor and adjusting the distribution of the filler, and therefore the quality of the finished paper is improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for optimizing paper structure and improving paper-making performance. Background technique [0002] Adding fillers in the papermaking process can effectively improve the optical properties and printability of paper. On the other hand, since the cost of fillers is lower than that of fibers, the use of fillers is also beneficial to reduce production costs. For most paper mills, optimizing various properties of paper is mainly achieved by adding various chemical additives, such as strengthening agents, whitening agents, etc., to achieve the purpose of improving paper performance. Relevant studies have shown that changes in additive types, paper machine types, headbox and dehydration conditions have a greater impact on the distribution of fillers in paper sheets. This shows that the distribution of fillers in the paper can be regulated by various methods, s...

Claims

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Application Information

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IPC IPC(8): D21D1/02D21D1/20D21H17/67D21H21/10
Inventor 宋顺喜张美云王建吴养育郝宁李琳
Owner SHAANXI UNIV OF SCI & TECH
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