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Method for improving pop strength of paper sheet and paper sheet manufactured through method

A technology of bursting strength and paper, applied in the field of paper to improve the bursting strength of paper, can solve the problems of increasing dosage, increased input cost, inability to achieve high bursting strength, increased input cost, and improved bursting strength.

Active Publication Date: 2014-04-23
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of refining capacity, the maximum addition amount of long fiber cannot be increased more (under normal conditions, the maximum feeding capacity of long fiber refining line can only account for 30% of the total pulp)
The most direct way to increase the refining capacity of the pulp line is to increase the number of disc refiners, which will inevitably lead to an increase in input costs (the average cost of a disc refiner is about 1.2-1.5 million RMB)
In addition, the increase in the amount of pulp used will also lead to a decrease in the beating effect due to the limit of the refining power
Therefore, the existing process is more difficult to produce paper with higher bursting strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the long-fiber refining line and the short-fiber refining line, long-fiber pulp accounts for 56% of the total pulp, and the rest is short-fiber pulp; among them, the long-fiber pulp added to the short-fiber refining line accounts for 56% of the total pulp. 25% of. The pulping line is equipped with two refiners connected in series, and the power ratio of the two refiners along the flow of the pulp is 45:55. After refining treatment, the freeness of long fiber pulp in the long fiber refining line reaches 461ml, and the freeness of the mixed pulp of long fiber and short fiber in the short fiber refining line reaches 403ml. Under the premise of controlling the slurry network speed ratio to be greater than 1, reduce the rotation speed of the slurry supply pump.

[0029] The paper prepared in Example 1 has a grammage of 80g and a bursting strength of 346kPa, which is much higher than the national standard (exceeding the target bursting strength of 320kPa).

[0030] Note:...

Embodiment 2

[0032] In the long-fiber refining line and the short-fiber refining line, the long-fiber pulp accounts for 58% of the total pulp, and the rest is short-fiber pulp; among them, the long-fiber pulp added to the short-fiber refining line accounts for 58% of the total pulp. 28% of the total. The pulping line is equipped with two refiners connected in series, and the power ratio of the two refiners along the flow of the pulp is 45:55. After refining, the freeness of long fiber pulp in the long fiber refining line reaches 447ml, and the freeness of the mixed pulp of long fiber and short fiber in the short fiber refining line reaches 419ml. Under the premise of controlling the slurry network speed ratio to be greater than 1, reduce the rotation speed of the slurry supply pump.

[0033] The paper prepared in Example 2 has a grammage of 120g and a bursting strength of 407kPa, which is much higher than the national standard (exceeding the target bursting strength of 380kPa).

Embodiment 3

[0035] In the long-fiber refining line and the short-fiber refining line, the long-fiber pulp accounts for 59% of the total pulp, and the rest is short-fiber pulp; among them, the long-fiber pulp added to the short-fiber refining line accounts for 59% of the total pulp. 29%. When the pulp line is provided with three refiners connected in series, the power ratio along the flow of the pulp to the three refiners is 25:35:40. After refining, the freeness of long fiber pulp in the long fiber refining line reaches 461ml, and the freeness of the mixed pulp of long fiber and short fiber in the short fiber refining line reaches 434ml. Under the premise of controlling the slurry network speed ratio to be greater than 1, reduce the rotation speed of the slurry supply pump.

[0036] The paper prepared in Example 3 has a grammage of 100 g and a bursting strength of 352 kPa, which is much higher than the national standard (exceeding the target bursting strength of 350 kPa).

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Abstract

The invention provides a method for improving the pop strength of a paper sheet. The method includes the following steps that long fibers and short fibers are selected for use; a long fiber pulping line and a short fiber pulping line are adopted, the short fibers and long fibers are added in the short fiber pulping line, and only the long fibers are added in the long fiber pulping line; the added long fibber pulp accounts for the total amount of pulp by 55-60% in the long fiber pulping line and the short fiber pulping line, the balance is the short fiber pulp, and the long fiber pulp added in the short fiber pulping line accounts for the total amount of pulp by 25-30%; at least two pulping machines are arranged in series in each pulping line, and in the flowing direction of the pulp, power distribution proportions of all the pulping machines are set from low to high; on the premise that the ratio of net touch speed of the pulp to moving speed of a formation net is controlled to be larger than one, rotation speed of a pulp supplying pump is reduced. The invention further provides the paper sheet manufactured through the method. The method can achieve the purpose of improving the pop strength without increasing investment cost.

Description

technical field [0001] The invention relates to a method for increasing the bursting strength of paper and the paper prepared by the method. Background technique [0002] Bursting strength is an important index to measure the strength of paper. Paper with high bursting strength is widely used in the production of paper bags, envelopes, record sleeves, files and sandpaper. The improvement of bursting strength depends to a large extent on the strength of raw pulp, beating process and fiber distribution. [0003] The burst index of softwood pulp (long fiber) is much higher than that of hardwood pulp (short fiber). The burst index of long fiber is 6-8kgf / cm, and that of short fiber is 2.5-4kgf / cm. Therefore, using a large amount of long fibers can effectively improve the bursting strength of paper sheets. However, according to the production capacity of the paper machine, the relevant refining lines designed for each large-scale cultural paper machine are divided into long-fi...

Claims

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Application Information

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IPC IPC(8): D21D1/20D21H15/10
Inventor 翟凤卫李云胜刘龙坤朱成刚
Owner GOLD EAST PAPER JIANGSU
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