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Straw and/ or ryegrass raw material semi-chemical pulp preparation method

A semi-chemical pulp and wheat straw technology, applied in pulp beating/refining methods, raw material separation, fiber raw material treatment, etc., can solve the problems of low average length of pulping fibers, high refining energy consumption, poor paper strength performance, etc. Achieve the effect of improving strength performance index, reducing fiber damage and improving strength performance

Inactive Publication Date: 2008-09-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the fibers of straw and / or wheat straw semi-chemical pulp are relatively stiff, and the fibers are short and have a high content of miscellaneous cells, the use of this low-concentration refining treatment will cause severe cutting of the fibers and make the average length of the pulped fibers lower. Paper has poor strength properties
However, the use of high-concentration refining has disadvantages such as difficulty in slurry transportation, large equipment investment, and high energy consumption for refining.

Method used

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  • Straw and/ or ryegrass raw material semi-chemical pulp preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 according to figure 1 The represented device operates as follows:

[0021] (1) After chemical pre-impregnation or cooking, the rice straw raw material is sent to the hydropulper 1 for dilution and dispersion. Here, the raw material was diluted with water to a concentration of 3.5% (weight %), and dispersed into a uniform material, and the treatment time was 20 minutes.

[0022] (2) The diluted and dispersed material is transported by the pump 2 to the disintegrating machine 3 for discrete and disintegrating treatment. The rotating speed of the executive element of the deflaker is 1500 rpm. Under the action of the shearing force generated by the high-speed rotation of the actuator of the debonder, the straw raw material is dispersed and decomposed into fiber bundles.

[0023] (3) The slurry dispersed and decomposed by the dehydrator 3 is transported to the dehydration equipment 4 for dehydration, and concentrated to a concentration of 8.4% (weight %).

[00...

Embodiment 2

[0027] Example 2 according to figure 1 The represented device operates as follows:

[0028] (1) After chemical pre-impregnation or cooking, the wheat straw raw material is sent to the hydropulper 1 for dilution and dispersion. Here, the raw material was diluted with water to a concentration of 4.5% (weight %), and dispersed into a uniform material, and the treatment time was 30 minutes.

[0029] (2) The diluted and dispersed material is transported by the pump 2 to the disintegrating machine 3 for discrete and disintegrating treatment. The rotating speed of the executive element of the deflaker is 980 rpm. Under the action of the shearing force generated by the high-speed rotation of the actuator of the deflaker, the wheat straw raw material is dispersed and decomposed into fiber bundles.

[0030] (3) The slurry dispersed and decomposed by the dehydrator 3 is transported to the dehydration equipment 4 for dehydration, and concentrated to a concentration of 10% (weight %). ...

Embodiment 3

[0034] Example 3 according to figure 1 The represented device operates as follows:

[0035] (1) Rice straw and wheat straw each account for half of the weight. After chemical pre-impregnation or cooking, they are sent to the hydropulper 1 for dilution and dispersion. Here, the raw material was diluted with water to a concentration of 2.5% (weight %), and dispersed into a homogeneous material, and the processing time was 25 minutes.

[0036] (2) The diluted and dispersed material is transported by the pump 2 to the disintegrating machine 3 for discrete and disintegrating treatment. The rotating speed of the executive element of the deflaker is 1500 rpm. Under the action of the shear force generated by the high-speed rotation of the actuator of the deflaker, the material is dispersed and decomposed into fiber bundles.

[0037] (3) The slurry separated and decomposed by the dehydrator 3 is transported to the dehydration equipment 4 for dehydration, and concentrated to a concen...

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Abstract

The invention discloses a semi-chemical pulp preparation method of a straw and / or wheat straw hood raw material, comprising the following steps that: (1) after the straw and / or wheat straw hood raw material is processed by the chemical pre-dipping treatment or is boiled, the straw and / or wheat straw hood raw material is sent to a hydrabrusher to dilute and disperse, the concentration is added with water to adjusted within the range of 2.5 to 4.5 percent, and the straw and / or wheat straw hood raw material is dispersed into even materials; (2) the diluted and dispersed material is sent to a fluffer by a pump to process, the straw and / or wheat straw hood raw material is dispersed and disintegrated to become a fasciculus; (3) the dewatering and concentrating are performed: the paste after dispersed and disintegrated by the fluffer is transported to a dewatering device to dewater and is concentrated to a solution with a concentration ranging from 6 to 10 percent; (4) the pulping is performed: the dewaterd and concentrated pulp is pumped up to a disk grinder to perform the pulping in order to obtain the pulp for papermaking. The preparation method effectively keeps the fiber length, improves the intensity performance of the paper and has low energy consumption.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and relates to a pulp preparation method, in particular to a semi-chemical pulp preparation method of rice straw and / or wheat straw raw materials. Background technique [0002] The raw materials for papermaking are mainly plant fibers, including wood fibers and non-wood fibers. In countries rich in forest resources such as Europe and America, wood is the main raw material for papermaking, and more than 90% of paper is made from wood fiber raw materials. [0003] In my country and some other Asian countries, due to the shortage of wood resources, non-wood resources are important raw materials for pulp and paper. Straw and wheat straw are important non-wood papermaking fiber raw materials in my country. The traditional chemical pulping of rice straw and wheat straw has defects such as high concentration of waste liquid, high pollution, and high silicon content in waste liquid, which makes i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21B1/34D21C9/18D21D1/30
Inventor 雷利荣李友明
Owner SOUTH CHINA UNIV OF TECH
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