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Chemical treatment and hot pulping process of wood pulp and dreg pulp with mechanical mill and stone mill

A technology for chemical treatment and slag pulp, applied in multi-stage pulping process, fiber raw material treatment, textile and papermaking, etc., can solve the problems of lower strength and tear index than chemical pulp, high yield, poor quality, etc., to improve product quality. The effect of quality grade, obvious comprehensive benefit and simple pulping process

Inactive Publication Date: 2003-01-01
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Mechanical grinding stone groundwood pulp belongs to the physical method of pulping. Its pulping is characterized by high yield, good optical properties of paper, and low cost, but the strength of pulp, such as fracture length and tear index, is not as good as that of chemical pulp.
In particular, the screened pulp is fed into the disc refiner without any effective treatment, the refining effect is poor, and the poor-quality pulp fibers are recycled in the production process, which restricts the improvement of the quality and output of mechanically ground wood pulp. Thereby affecting the paper quality of newsprint

Method used

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Examples

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Embodiment

[0012] 1000Kg of screened slurry with a concentration of 2.8% and a knock-down degree of 35°SR is added to the outlet of the screened slurry with a concentration of 5Kg of NaOII chemicals of 200g / 1. When the refining concentration is 2.7%, the refining temperature is 70-90°C. Under the process condition of refining pressure 0.1~1.0Mpa, after refining with Φ600mm disc refiner, the beating degree of pulp after refining is 45°SR. After the slurry is mixed with the system, it is screened, purified, concentrated, and bleached with hydrogen peroxide to obtain a whiteness of 57-60% (ISO), a degree of percussion of 78°SR, a breaking length of 2300m, and a tear index of 3.2mN. m 2 / g, wet weight 4.0g mechanical ground wood pulp for making high-grade newsprint.

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Abstract

The present invention features that after chemical treatment with alkali, the wood pulp is ground mechanically. Thus produced wood pulp has whiteness of 57-60 % (ISO), beating degree of 70-78 deg SR, breaking length greater than 2200 m, splitting index greater than 2.8 mN.sq.m square / g and wet weight of 4.0g. The present invention, as one optimized pulp grinding process, has simple process, low cost and high pulp grinidng effect.

Description

technical field [0001] The invention relates to a chemical treatment of mechanical grinding stone ground wood pulp slurry and its refining process Background technique [0002] In recent years, with the development of printing technology and the continuous improvement of people's living standards, the quality requirements for newsprint are getting higher and higher, and various paper companies are also trying their best to find ways to improve the quality of newsprint to adapt to the development of the "entry" paper industry needs. As the main pulp for blending newsprint [0003] How to improve and improve the pulping quality of mechanically stone-ground wood pulp will play an important role in stabilizing and improving the quality of newsprint. Mechanical groundwood pulp belongs to physical pulping. Its pulping is characterized by high yield, good optical properties of paper, and low cost. However, the strength of pulp such as fracture length and tear index is not as good...

Claims

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Application Information

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IPC IPC(8): D21B1/16D21C3/26
Inventor 施圣龙彭伏龙朱绪兵
Owner YUEYANG FOREST & PAPER CO LTD
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