Pulping method of wet strength waste paper

A technology of waste paper and wet strength, which is applied in waste paper processing, paper making, paper recycling, etc. It can solve the problems of low fiber recovery rate, long disintegration time, and high energy consumption of pulp, so as to reduce dissociation time and increase penetration , improve the pulping efficiency and the effect

Active Publication Date: 2016-08-31
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on this, it is necessary to provide a wet-strength waste paper pulping method for the existing problems of serious environmental pollution, large amount of slag discharge, long disintegration time, low fiber recovery rate, and high pulping energy consumption.

Method used

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  • Pulping method of wet strength waste paper
  • Pulping method of wet strength waste paper
  • Pulping method of wet strength waste paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Effect of different enzymes on the complete shredding time of wet strength waste paper

[0048] (1) Test materials

[0049] Waste paper: Broken paper from a household paper mill in Jiangmen, Guangdong, containing 1-5% polyamide epichlorohydrin resin (PAE) wet strength agent;

[0050] Enzyme:

[0051] 1. Amidase and nitrilase: purchased from SigmaAldrich, USA (St.Louis, MO), derived from Pseudomonas aeruginosa, expressed in E.Coli after recombination;

[0052] 2. Serine protease: produced by Guangzhou Ruichen Shengda Biotechnology Co., Ltd.; TM The test product WS-8001, which is derived from Bacillus (Bacillus), has an activity of 3U / g protein;

[0053] 3. Amidase: Produced by Guangzhou Ruichen Shengda Biotechnology Co., Ltd.; TM The test product WS-8002 is a variety of biological enzymes derived from Lactobacillus (Lactobacillus), mainly polyamidase (polyamidase); its polyamidase activity is determined according to the literature (Heumann et al., Biotechno...

Embodiment 2

[0071] Embodiment 2 Contrastive analysis of adding different amounts of amidase, the amount of leaching waste, the recovery rate of effective fibers and the yield of fine fibers

[0072] (1) Test materials

[0073] Waste paper: coated food packaging paper with high wet strength;

[0074] Amidase: Produced by Guangzhou Ruichen Shengda Biotechnology Co., Ltd.; TM The test product WS-8002 is a variety of biological enzymes derived from Lactobacillus (Lactobacillus), mainly polyamidase (polyamidase). Said method was determined to be 1.1U / g.

[0075] (2) The concrete steps of pulping method are as follows:

[0076] (1) Cut the waste paper into squares with a width of about 3×3 cm, put it into water at a temperature of 40° C., stir and mix to obtain a waste paper slurry; wherein, the concentration of the waste paper is 20%;

[0077] (2) The temperature of the waste paper slurry in the adjustment step (1) is 40° C., and the pH is 7-8. Add amidase (see Table 2) according to the we...

Embodiment 3

[0084] Example 3 Comparative analysis of the effects of adding caustic soda (control group) and biological enzyme (test group) on disintegration time and paper

[0085] In order to improve the strength, especially the stiffness, of paper towels during production, a large amount of wet strength agent needs to be added. Due to the presence of high wet strength agents, it is extremely difficult to pulp broken paper / broken paper. Even if the pulping time is prolonged, it still contains a large number of pulp lumps, which requires high temperature pulping (75°C) and the addition of a large amount of caustic soda and sodium hypochlorite (per A ton of waste paper needs to be added 20-100 kg).

[0086] (1) Test materials

[0087] Waste paper: paper towels;

[0088] Amidase: Produced by Guangzhou Ruichen Shengda Biotechnology Co., Ltd.; TM The test product WS-8002 is a variety of biological enzymes derived from Lactobacillus (Lactobacillus), mainly polyamidase (polyamidase). Said m...

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Abstract

The invention discloses a wet-strength waste paper pulping method. The pulping method comprises the following steps: putting wet-strength waste paper in water and evenly mixing to obtain waste paper pulp; adjusting the pH value of the waste paper pulp to 3-10 and adding a biological enzyme for enzymolysis to obtain enzymatically degraded pulp, wherein the addition amount of the biological enzyme is 0.05-20kg per ton of wet-strength waste paper, the temperature of enzymolysis is 20-80 DEG C and the time of enzymolysis is 2-600 minutes; and pulping the enzymatically degraded pulp in a pulper to obtain paper pulp. According to the method, a wet-strength agent is selectively degraded by the biological enzyme, so that the combination between the wet-strength agent and fibers is destroyed, the moistening of the fibers is accelerated, and the pulping efficiency and the yield of fibers are enhanced; the pulping method is environmental friendly and safe since only biological enzyme needs to be added; all waste water during production can be recycled, and is not discharged to external, so that no environment pollution is caused; with the paper pulp produced by the method, the paper quality and the papermaking efficiency can be remarkably enhanced.

Description

technical field [0001] The invention relates to a pulping method of waste paper, in particular to a pulping method of wet strength waste paper. Background technique [0002] With the continuous consumption of global forest resources, the wood pulp produced from trees is becoming more and more scarce, and the recycling of waste paper has become a common practice in the world. In order to increase the strength of paper products, especially in a humid environment, some wet strength agents and dry strength agents are usually added during the papermaking process. [0003] At present, the wet strength agents used in papermaking include urea-formaldehyde resin (UF) and its modified products, melamine-formaldehyde resin (MF) and its modified products, and polyamide epichlorohydrin (PAE) and its modified products. Since the current papermaking is mainly carried out under medium-alkaline conditions, melamine-formaldehyde resin (MF) and urea-formaldehyde resin (UF) can only be used un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 王祥槐谢焱
Owner RISINGSTAR BIOTECH GUANGZHOU
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