Method of producing bleached chemi-mechanical pulp from Eucalyptus sheets

A technology of eucalyptus chips and mechanical pulp, applied in pulp beating/refining methods, pulp bleaching, pulp dehydration, etc., can solve problems such as high moisture content, relatively high requirements, and impact, and achieve good results and simplify the process flow Effect

Active Publication Date: 2015-08-19
NANNING SUGAR INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses eucalyptus wood chips instead of eucalyptus wood chips in the preparation, which has relatively high requirements on raw materials, and the material is extruded and concentrated before refining, and a double-screw extruder with variable diameter and pitch is used to extrude and tear the material. After cracking and dehydration, the moisture content of the material is not more than 45%wt, which is relatively high compared to the eucalyptus pulp, which will affect the subsequent treatment

Method used

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  • Method of producing bleached chemi-mechanical pulp from Eucalyptus sheets

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Experimental program
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Effect test

Embodiment 1

[0020] The first step, the preparation of raw materials: the eucalyptus wood chip raw material is firstly washed with hot water, the temperature of the hot water is 75°C, and the preheating storage period of the hot water washing of the eucalyptus wood chip is 35 minutes.

[0021] The second step is extrusion tearing and dehydration: the single-screw extruder with a variable-diameter conical structure in which the diameter of the spiral cone shaft decreases first and then becomes larger, and a variable-pitch structure in which the pitch of the spiral blades gradually increases. The material is subjected to extrusion, tearing and dehydration treatment. During extrusion, tearing and dehydration, the volume compression ratio of the raw material and the compressed material is 3.5:1. After extrusion, tearing and dehydration, the material becomes a multi-gap loose filament sponge, with a moisture content of 25%. wt.

[0022] The third step, one-time dipping and bleaching: put the mu...

Embodiment 2

[0028] The first step, the preparation of raw materials: first wash the eucalyptus wood chips raw material with hot water, the temperature of the hot water is 80°C, and the preheating storage period of the hot water washing of the eucalyptus wood chips in the preparation of raw materials is 40 minutes;

[0029]The second step is extrusion tearing and dehydration: the single-screw extruder with a variable-diameter conical structure in which the diameter of the spiral cone shaft decreases first and then becomes larger, and a variable-pitch structure in which the pitch of the spiral blades gradually increases. The material is subjected to extrusion, tearing and dehydration treatment. During extrusion, tearing and dehydration, the volume compression ratio of the raw material and the compressed material is 3.6:1. After extrusion, tearing and dehydration, the material becomes a multi-gap loose filament sponge, with a moisture content of 21%. wt.

[0030] The third step, one-time dip...

Embodiment 3

[0036] The first step, the preparation of raw materials: the eucalyptus wood chip raw material is firstly washed with hot water, the temperature of the hot water is 90° C., and the preheating preservation stage time of the hot water washing of the eucalyptus wood chip is 45 minutes.

[0037] The second step is extrusion tearing and dehydration: the single-screw extruder with a variable-diameter conical structure in which the diameter of the spiral cone shaft decreases first and then becomes larger, and a variable-pitch structure in which the pitch of the spiral blades gradually increases. The material is subjected to extrusion, tearing and dehydration treatment. During the extrusion, tearing and dehydration, the volume compression ratio of the raw material and the compressed material is 3.8:1. After the extrusion, tearing and dehydration, the material becomes a multi-gap loose filament sponge, with a moisture content of 18%. wt.

[0038] The third step, one-time dipping and bl...

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Abstract

The invention discloses a method of producing bleached chemi-mechanical pulp from Eucalyptus sheets. The method includes the steps of preparing raw material, extruding the raw material for dewatering, namely using a single-screw extruder to extrude and dewater the Eucalyptus sheets so as to obtain multi-gap loose thread-like sponge capable of absorbing chemicals, and performing in order impregnate-bleaching, high-concentration pressurized grinding, post-grinding full mixing and bleaching of fiber bundles and liquid medicine, secondary high-concentration pressurized grinding and impurity removal so as to obtain high-whiteness high-bulkiness pulp. The method is simpler, good in producing effect and energy saving and environment friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical mechanical pulping, in particular to a method for preparing bleached mechanical pulp by using eucalyptus chips. Background technique [0002] my country is a big country in the production and consumption of paper and cardboard, and the production and consumption of paper and cardboard both rank first in the world. The paper industry is one of the basic industries of the national economy, which is closely related to social and economic development and people's lives. It is an internationally recognized "never-failing" evergreen industry. With the rapid development of my country's economy, the demand for paper and paper products is increasing rapidly. According to the statistics of the Food and Agriculture Organization of the United Nations (FAO), the per capita consumption of paper and paper products in my country was only 16.8kg in 1980, increased to 32.8kg in 2000, and reached about 73kg in 201...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/30D21C9/10D21C9/18D21D1/20
CPCD21B1/30D21C9/101D21C9/163D21C9/18D21D1/20
Inventor 傅其军肖凌陆琪岑跃吴明刚庞玉辉覃云斋李品端李有忠王玉军
Owner NANNING SUGAR INDUSTRY CO LTD
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