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Re-pulping method for high wet strength waste paper containing PAE resin

A waste paper and high-humidity technology, which is applied in the processing of waste paper, paper making, paper recycling, etc., can solve the problems such as the decline of recycled paper quality and performance, high energy consumption, and the decline in the utilization value of recycled paper pulp, and achieves low cost and pulping effect. Good and easy-to-operate effect

Inactive Publication Date: 2012-09-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of methods either cause the quality and performance of recycled paper to decline due to the degradation of waste paper fibers by caustic soda, or the recycled pulp still contains more waste paper fragments, resulting in a decline in the utilization value of recycled pulp; at the same time, waste High energy consumption for mechanical deflaking of paper after chemical pretreatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Soaking treatment section: First, soak the high wet strength waste paper containing PAE resin in an oxidant aqueous solution at 40°C for 30 minutes to obtain a slurry system. The oxidant is sodium hypochlorite. 0.5% of the mass, and the slurry concentration of the slurry system is 10%; 2) Mechanical crushing / threshing section: move the slurry system into the fiber pulper for mechanical pulping, and add tap water during the mechanical pulping process Adjust the pulp concentration to 5.0% by using the method; 3) Dehydration and concentration section: dehydrate and concentrate the mechanically pulped pulp to realize the separation of waste liquid and pulp fibers, and the pulp fibers are used as raw materials for recycling new paper. The dehydration and concentration adopts the method of combining extrusion and dilution diffusion filtration. The waste liquid separated in the dehydration and concentration process is filtered and precipitated to remove fibers and sediment, ...

Embodiment 2

[0018] 1) Soaking treatment section: First, soak the high wet strength waste paper containing PAE resin in an oxidant aqueous solution at 40°C for 30 minutes to obtain a slurry system. The oxidant is sodium hypochlorite. 1.0% of the mass, and the slurry concentration of the slurry system is 10%; 2) Mechanical crushing / threshing section: move the slurry system into the fiber pulper for mechanical pulping, and add tap water during the mechanical pulping process Adjust the pulp concentration to 5.0% by using the method; 3) Dehydration and concentration section: dehydrate and concentrate the mechanically pulped pulp to realize the separation of waste liquid and pulp fibers, and the pulp fibers are used as raw materials for recycling new paper. The dehydration and concentration adopts the method of combining extrusion and dilution diffusion filtration. The waste liquid separated in the dehydration and concentration process is filtered and precipitated to remove fibers and sediment, ...

Embodiment 3

[0020] 1) Soaking treatment section: First, soak high wet strength waste paper containing PAE resin in oxidant aqueous solution at 35°C for 45 minutes to obtain a slurry system. The oxidant is sodium hypochlorite. 1.5% of the mass, and the slurry concentration of the slurry system is 10%; 2) Mechanical disintegration / threshing section: move the slurry system into the fiber pulper for mechanical pulping, and add tap water during the mechanical pulping process Adjust the pulp concentration to 4.5%; 3) Dehydration and concentration section: dehydrate and concentrate the pulp after mechanical pulping to realize the separation of waste liquid and pulp fibers, and the pulp fibers are used as raw materials for recycling new paper. The dehydration and concentration adopts the method of combining extrusion and dilution diffusion filtration. The waste liquid separated in the dehydration and concentration process is filtered and precipitated to remove fibers and sediment, and then an oxid...

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PUM

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Abstract

The invention provides a re-pulping method for high wet strength waste paper containing PAE resin. The method is based on the action principle of damaging the wet strength of paper by an oxidation process, and an oxidizing agent having an obvious action on the wet strength of PAE resin-contained high wet strength paper is used for chemical damage and mechanical defibering treatment of paper in a system with a certain water phase concentration under the conditions of a proper dosage of reagent and temperature; the PAE resin-contained high wet strength waste paper is soaked in chemical solution containing the oxidizing agent for a while and then subjected to crushing and defibering treatment by a fiber pulping defibering machine, so the paper scraps are subjected to defibering to form fiber pulp which can be used for paper making or other purposes. The method has the advantages of low cost, good pulp-forming effect and the like, and is easy to operate.

Description

technical field [0001] The invention relates to a recycling method for special waste paper, in particular to a repulping method for high wet strength waste paper containing PAE resin. Background technique [0002] PAE is the abbreviation of polyamide polyamine epichlorohydrin resin, which belongs to a kind of water-soluble thermosetting resin with cationic characteristics. The use of PAE in the paper production process can not only significantly improve the moisture resistance of paper, but also has non-toxic environmental protection, Due to its application characteristics such as a wide range of pH values, it has become a widely used wet strength additive in the production process of some high wet strength paper types such as fruit bagging paper and bond paper. High wet strength waste paper containing PAE resin is generally made of better quality fiber raw materials, but due to its high wet strength, the recycling of dry broken paper and the repulping of waste paper in the ...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21B1/34
CPCY02W30/64
Inventor 韩卿丁彬
Owner SHAANXI UNIV OF SCI & TECH
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