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Method for biologically pretreating slurry before grinding

A pretreatment and pulping technology, applied in pulp beating/refining methods, cellulose pulp post-treatment, fiber raw material treatment, etc., to achieve the effects of reducing beating energy consumption, improving physical properties, and saving energy

Inactive Publication Date: 2017-01-04
GOLD HUASHENG PAPER SUZHOU IND PARK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the papermaking section, the application of white rot fungus is still blank in the aspect of pretreatment of pulp after loosening and before refining

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 300 / 78 eucalyptus wet pulp biological treatment:

[0023] After the 300 / 78 eucalyptus wet pulp is sterilized by ultrasonic waves, it is mixed with water at a volume ratio of 1:4 to make a fermentation substrate. 1.5%-2.0% dry weight ratio is inoculated into the substrate, stirred evenly, the temperature is controlled at 25°C-30°C, the humidity is controlled at 80%-90%, and the fermentation time is 7-12 days. After the fermentation is finished, the kappa number of the slurry drops from 82 to 39 after washing with water.

[0024] Use the pulp before and after treatment as raw materials, grind to the same freeness (425ml) to make handsheets, and when the ash content is set to 25%, the tensile strength of the handsheets increases from 9.89N·m / g to 13.15N ·m / g, cohesion increased from 0.62kg·cm to 0.84kg·cm.

Embodiment 2

[0026] 325 / 80 eucalyptus dry pulp biological treatment:

[0027] After the 325 / 80 eucalyptus dry pulp is sterilized at high temperature, the raw material pulp board is cut into small pieces of 0.5cm ~ 5cm or crushed into 1cm 2 About small pieces (passing through a 40-mesh sieve), add 0.01% to 1% of the dry weight of the pulp Mycelia mycelia liquid, and add water to a proportion of 50% to 80%, stir evenly, and put it at a temperature of 25 ° C. After fermenting at ~30°C for 7-12 days, wash with water. After treatment, the Kappa number of the slurry dropped from 163 to 75.

[0028] Use the pulp before and after treatment as raw materials, grind to the same freeness (425ml) to make handsheets, and when the ash content is set to 30%, the tensile strength of the handsheets increases from 11.80N·m / g to 13.77N ·m / g, cohesion increased from 0.65kg·cm to 0.81kg·cm.

[0029] The invention can effectively remove lignin, reduce the energy consumption of pulping, and improve the physica...

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PUM

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Abstract

The invention discloses a pretreating method for slurry before grinding. The pretreating method includes the following steps that 1, the type of white rot fungi is selected; 2, the slurry is sterilized; 3, the white rot fungi are added into the slurry for fermentation culture. Lignin can be effectively removed, grinding energy consumption can be reduced, and the physical property of finished paper can be improved. The physical property of the slurry treated through the method is improved, and the strength of the finished paper is improved.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a method for biologically pretreating pulp before pulp refining. Background technique [0002] Wood pulp made from wood fiber, especially high-yield mechanical pulp is used for papermaking. The residual lignin in the pulp has a great influence on the physical properties of the paper. If the lignin content is high, the strength and physical properties of the paper, such as tearing and resistance Tensile strength, cohesion, etc. will be affected and will be low, and at the same time, the energy consumption required for pulping will be correspondingly high, which will reduce the quality of paper and increase the cost. In order to remove the lignin in the pulp, the pulp can be pretreated before refining to remove the lignin. [0003] Chinese patent (CN101967771A) introduces a method for improving pulp properties: dry and concentrate the pulp, add ionic liquid (1-butyl-3-methyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/00D21D1/20
CPCD21C9/00D21D1/20
Inventor 刘仙阳
Owner GOLD HUASHENG PAPER SUZHOU IND PARK
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