Swlfate wood-pulp enzyme-method modifying process

A sulfate and wood pulp enzyme technology, applied in the direction of cellulose pulp post-treatment modification, chemical/chemical mechanical pulp, etc., can solve the problems of pulp strength damage, wet end system complexity, pulp strength decline, etc., to improve run-up , increase the effect of splitting and improving physical strength

Inactive Publication Date: 2006-08-09
QILU UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the effect of cellulase treatment on pulp strength, it is generally believed that as long as the appropriate reaction conditions are controlled, enzyme treatment will not cause a large change in physical strength, and excessive enzyme dosage and long reaction time will cause a significant increase in pulp strength. decline
[0006] Judging from the current research situation, although different biological enzymes treat the pulp, although the energy consumption of beating is reduced, most of them have a certain degree of damage to the strength of the pulp. In the papermaking process, it is necessary to add expensive chemicals to increase the paper strength Strength, the use of these chemicals has a limited effect on improving the strength of paper, and leads to the complexity of the wet end system. At the same time, it will have an adverse effect on the reuse of white water. Enzyme preparations that can improve pulp strength are of great significance to the beating of kraft pulp and the improvement of fiber properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Import Canadian "Golden Lion" brand coniferous kraft bleached pulp, 3-5% of the pulp in the hydropulper is crushed at a low concentration, cellulase Novozymes476 is added separately during the crushing process, and the amount of enzyme added is 100g / ton of pulp. Disintegrate for 10 minutes, then treat at 40-55°C, pH 6.0-7.5 for 30-2.0 hours, and then use a disc refiner to refine pulp at a pulp concentration of 3-4%. The beating degree of the pulp after refining is 70-75°SR. Compared with the pulp without enzyme treatment, after beating with enzyme treatment, the tensile strength is increased by 20% and the bursting strength is increased by 15% under the same beating degree. Tear strength was essentially the same while beating time was reduced by 15%.

Embodiment 2

[0020] Eucalyptus kraft hardwood bleached pulp, 3-5% of the pulp in the hydropulper is crushed under concentration, and a 1:1 weight ratio mixture of cellulase Novozymes476 and Nozymes51064 is added during the crushing process, and the enzyme addition is 150g / ton of pulp, crushed for 10 minutes, then treated at 30-55°C, pH 5.0-7.5 for 0.5-2.0h, and then refined with a disc refiner at a pulp concentration of 3.0-4.0%. The beating degree of pulp after refining is 50-55°SR. Compared with the pulp without enzyme treatment, after beating with enzyme treatment, under the same beating degree, the tensile strength is increased by 15%, and the bursting strength is increased by 10%, while Tear strength was essentially the same while beating time was reduced by 10%.

Embodiment 3

[0021] Embodiment 3: As in embodiment 1, the difference is that the enzyme-treated pulp is unbleached softwood kraft pulp

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Abstract

This invention relates to a modifying method with enzyme method to sulfate wood pulp, in which, enzyme is added into the sulfate wood pulp before beating, the proportion of enzyme and the pulp is 20-1000g/t, the density is 3-15%, temperature: 20-60deg.C, time: 0.5-4h, pH: 5.0-8.5.

Description

(1) Technical field [0001] The invention relates to a chemical wood pulp biological treatment technology, in particular to a method for enzymatic modification of kraft wood pulp, and belongs to the technical field of pulp and paper making. (2) Background technology [0002] Kraft pulping is the most common method for producing high-strength pulp. The high strength of kraft pulp is mainly due to kraft cooking, which preserves the fiber shape and structure intact, and the fiber becomes soft, thus better retaining the single pulp. Root fiber strength, and give fibers a larger contact area, increasing the bonding force between fibers. However, the complete fiber morphology also brings difficulties to subsequent beating. Moreover, kraft cooking also makes lignin uniformly distributed in the fiber cell wall according to the thickness, which hinders the beating. The high degree of polymerization of primary wall carbohydrates in the cell wall and the LCC on the fiber surface make k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/20D21H11/06
Inventor 秦梦华李宗全傅英娟徐清华
Owner QILU UNIV OF TECH
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