Method for reducing damage of waste-paper fibers in high-concentration pulping process

A waste paper fiber, high-concentration shredding technology, used in fiber raw materials, fiber raw material processing, papermaking, etc., can solve the problems of short secondary fibers, uncomfortable reuse, easy to destroy fibers, etc., to reduce damage and improve the effect. , the effect of good liquidity

Active Publication Date: 2018-11-16
DONGGUAN TAICHANG PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing pulping technology, waste paper is pulped by crushing, grinding, cutting and other mechanical methods. This method is easy to break the fibers in the waste paper, and the fibers are too short, which is not conducive to the reuse of subsequent papermaking.
Or use chemical methods to decompose and degrade waste paper by using acid-base chemical agents, but acid-base chemical agents are easy to destroy the fibers in waste paper, making the decomposed secondary fibers shorter, Also not suitable for subsequent reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for reducing waste paper fiber damage during high-consistency pulping, comprising the following steps:

[0026] (1) The step of adding waste paper slurry, adding the waste paper slurry into the high-pressure chamber, and controlling the slurry concentration of the waste paper slurry; the slurry concentration of the waste paper slurry is controlled to be 10wt%-16wt%.

[0027] (2) In the first high-pressure puffing step, close the high-pressure chamber, control the water pressure in the chamber at 10-30MPa, stabilize the pressure for 8-12 minutes, and release the pressure instantly, so that the tissue of the plant fiber will be puffed due to the huge pressure change , the fibers are torn and fluffy, so that the fibrous tissue of the plant is destroyed, and the first puffed pulp is obtained;

[0028] (3) In the step of swelling the first expanded slurry, the first expanded slurry is transported to the stirring and mixing equipment through the delivery pipeline, th...

Embodiment 2

[0035] The main structure, principle and effect of this embodiment are the same as those of Embodiment 1, and will not be repeated here. The difference is that:

[0036](1) The step of adding waste paper slurry, adding the waste paper slurry into the high-pressure chamber, and controlling the slurry concentration of the waste paper slurry, and controlling the slurry concentration of the waste paper slurry to 10wt%-16wt%;

[0037] (2) In the first high-pressure puffing step, the steam pressure in the chamber is controlled at 10-30 MPa, the pressure is stabilized for 8-12 minutes, and the pressure is released instantly to obtain the first puffed slurry;

[0038] (3) In the step of swelling the first expanded slurry, the first expanded slurry is transported to the stirring and mixing equipment through the delivery pipeline, the internal temperature of the stirring and mixing equipment is controlled at 40°C to 50°C, and the ZnCl 2 The aqueous solution is added to the stirring and ...

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PUM

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Abstract

The invention discloses a method for reducing damage of waste-paper fibers in the high-concentration pulping process. According to the method disclosed by the invention, through a waste-paper slurry adding step, a first high-pressure puffing step, a first puffing slurry swelling step, a second high-pressure puffing step and a pulping step, a fiber structure in waste-paper slurry is swelled and separated more completely from the pulping process; and the method is more suitable for reutilization of secondary fibers in the waste paper slurry, and at the same time, the method improves efficiency of the pulping process and quality of the secondary fibers obtained after pulping is performed.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking using recycled paper, in particular to a method for reducing waste paper fiber damage during high-concentration pulping. Background technique [0002] In the prior art, the raw materials for papermaking are mainly plant fibers, and besides the three main components of cellulose, hemicellulose, and lignin, there are other components with less content, such as resin and ash. In addition to plant fibers in paper, different fillers need to be added according to different paper materials. Now that the voice of environmental protection is getting higher and higher, paper mills have launched papers with different percentages of recycled paper content, including 100% recycled paper, and paper with only 50% recycled paper content, which suits the needs of different customers. [0003] The quality of waste paper fiber is declining day by day, mainly because the recycled fiber is compared wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/32D21B1/36D21B1/34D21C1/00D21C1/02
CPCD21B1/32D21B1/345D21B1/36D21C1/00D21C1/02Y02W30/64
Inventor 杜汉民杜汉杰余行宝黄奇志熊国平吴如双刘凯郑铭华郭政
Owner DONGGUAN TAICHANG PAPER CO LTD
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