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Pulping process with good deslagging effect

A pulping and process technology, applied in the field of corrugated paper, can solve the problems of poor slag removal effect and large fiber loss, and achieve the effects of good refining effect, small fiber loss and strong slag removal.

Active Publication Date: 2021-10-08
东莞顺裕纸业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the slag removal effect in pulping is poor, and the fiber loss is relatively large in the pulping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A pulping process with good slag removal effect, comprising the following steps:

[0019] (1) The recovered waste paper is broken into blocks, the block waste paper and clear water are dropped into the first reaction kettle according to the weight ratio of 1:300, and then 0.13wt% pectinase and 0.4wt% of calcium oxide, the weight ratio of clean water to bulk waste paper is 300:1, and the temperature is raised to 50°C to perform low-temperature softening treatment on the bulk waste paper for 1 hour, and then sent to a pulper for pulping to obtain primary Pulp, and the primary pulp is pre-removed; because the waste paper is softened before pulping, during the pulping process, the fiber loss is smaller and the useful fibers obtained are less.

[0020] (2) Separating the primary pulp after deslagging by a classifier successively to obtain short-fiber pulp, medium-fiber pulp and long-fiber pulp respectively;

[0021] (3) The short fiber slurry is deslagged sequentially throu...

Embodiment 2

[0026] A pulping process with good slag removal effect, comprising the following steps:

[0027] (1) The recovered waste paper is broken into blocks, the block waste paper and clear water are put into the first reaction kettle according to the weight ratio of 1:300, then add 0.23wt% pectinase and 0.4wt%-calcium oxide, the weight ratio of clean water and bulk waste paper is 300:1, and the temperature is raised to 50°C to carry out low-temperature softening treatment on the bulk waste paper for 2 hours, and then send it into a pulper for pulping, to obtain Preliminary pulp, and the primary pulp is pre-removed; because the waste paper is softened before pulping, the fiber loss is smaller during the pulping process, and less useful fibers are obtained.

[0028] (2) Separating the primary pulp after deslagging by a classifier successively to obtain short-fiber pulp, medium-fiber pulp and long-fiber pulp respectively;

[0029] (3) The short fiber slurry is deslagged sequentially th...

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Abstract

The invention relates to the technical field of corrugated paper, in particular to a pulping process with a good residue removal effect, which comprises the following steps: softening waste paper, and conducting pulping to obtain primary pulp; conducting separating to obtain short fiber pulp, medium fiber pulp and long fiber pulp; and respectively deslagging the short fiber pulp, the medium fiber pulp and the long fiber pulp, and respectively grinding the medium fiber pulp and the long fiber pulp after deslagging. Before repulping, waste paper is softened, in the repulping process, the fiber loss is smaller, the obtained useful fibers are fewer, the primary pulp is divided into the crude fiber pulp, the medium fiber pulp and the long fiber pulp, and corresponding slag removers are used for performing slag removal operation on the three kinds of pulp, so that the slag removal pertinence is higher; each kind of slurry is provided with at least three slag removers for sequentially removing slag, so that the slag removal effect is better; and different pulping modes are adopted according to the properties of the medium-fiber pulp and the long-fiber pulp, so that the pulping effect is better.

Description

technical field [0001] The invention relates to the technical field of corrugated paper, in particular to a pulping process with good slag removal effect. Background technique [0002] China is the world's largest producer of pulp and paper, but at the same time my country's forest resources are relatively scarce, and there is a serious shortage of fiber resources used in pulp and paper. In order to solve the problem of fiber resource shortage in my country, in addition to using a large number of non-wood fibers such as wheat straw In addition to pulping and papermaking with bagasse, etc., we also vigorously develop waste paper recycling technology to effectively recycle waste paper, which not only avoids a large amount of waste paper from polluting the environment, but also helps save valuable forest resources and reduce environmental damage. . However, in the prior art, the slag removal effect in the pulping process is poor, and the fiber loss is relatively large in the pul...

Claims

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Application Information

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IPC IPC(8): D21D1/20D21D5/02D21B1/10D21B1/32D21B1/34D21C5/00
CPCD21D1/20D21D5/02D21B1/10D21B1/32D21B1/345D21C5/005Y02W30/64
Inventor 刘伟锋刘志锋郝旭东
Owner 东莞顺裕纸业有限公司
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