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Waste paper pulping method

A technology of waste paper and pulping, which is applied in the direction of processing waste paper, pulping with inorganic alkali, and pulping of cellulose raw materials, which can solve the problems of resource waste and achieve the effect of eliminating pollution

Active Publication Date: 2012-05-30
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials for the production of various wet-strength waste paper are usually precious bast fiber and high-quality wood fiber, and the incineration or landfill of these fiber raw materials will be a great waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw material used in this embodiment is a toilet paper towel. The raw material is first subjected to oxidation treatment, the condition is that the dosage of potassium persulfate is 7%, the concentration is 4%, the time is 60min, the temperature is 90°C, and the pH is 2.5. After the oxidation treatment, the raw material is concentrated to a concentration of 20% by a concentrator, and then subjected to alkali extraction treatment with alkali under the conditions of pH 13, temperature 90° C., and time 40 minutes. After the alkali treatment, the raw materials are directly dispersed by a fruit juice machine for 3 minutes, then concentrated, and fully washed with clean water, and then screened. The width of the sieve is 0.3mm. Finally, the fiber of the good pulp obtained is uniform and the yield of the good pulp is high.

Embodiment 2

[0021] The raw material used in this embodiment is a wet-strength kitchen wipe. The raw material is oxidized with potassium persulfate and hydrogen peroxide, the conditions are: potassium persulfate 5%, hydrogen peroxide 2%, waste paper content 3%, time 50min, temperature 85°C, pH 2. After the oxidation treatment, the raw material is concentrated to a concentration of 26% by a concentrator, and then subjected to alkali extraction treatment with alkali under the conditions of pH 13, temperature 85° C., and time 50 minutes. After the alkali treatment, the raw materials are directly dispersed by a fruit juice machine for 5 minutes, then concentrated, washed fully with clean water, and then screened with a 0.3mm slotted sieve. Finally, the fine pulp obtained has uniform fibers, high yield of good pulp, and less pulp residue.

Embodiment 3

[0023] The raw material used in this embodiment is a wet-strength toilet paper towel. The raw material is treated with hypochlorite for oxygen destruction, the condition is 6% hypochlorite, 5% waste paper content, time 60min, temperature 40°C, pH2. After the oxidation treatment, the raw material is concentrated to a concentration of 22% by a concentrator, and then subjected to alkali extraction treatment with alkali under the conditions of pH 13, temperature 85° C., and time 50 minutes. After the alkali treatment, the raw materials are directly dispersed by a fruit juice machine for 5 minutes, then concentrated, fully washed with clean water, and then screened. Finally, the fiber of the good pulp obtained is uniform and the yield of the good pulp is high.

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PUM

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Abstract

The invention discloses a waste paper pulping method. Waste paper with wet strength is used as a raw material (such as kitchen wiping paper, paper towel, waste bank paper and the like) in the method. The waste paper with wet strength is treated and pulped by adopting the flows of oxidation treatment, concentration treatment, alkali extraction, scatting of a high-speed scatter, concentration treatment and washing, or oxidation treatment, concentration treatment, alkali extraction, concentration treatment, secondary oxidation treatment, concentration treatment, secondary alkali extraction, scatting of a high-speed scatter, concentration treatment and washing. The method has the advantages of compact and simple pulping flow, saved investment, low energy consumption, low production cost, low pollution, high production efficiency and strong environment friendliness; and the obtained pulp has high quality, can be used as an optional raw material of various high-grade papers, and has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a waste paper pulping method in the field of pulping and papermaking. Background technique [0002] At present, the pulping technology of ordinary waste paper without wet strength (such as waste newspapers, waste office paper, waste corrugated cardboard, etc.) is relatively mature; however, for waste paper with wet strength (referred to as wet strength waste paper), especially It is the pulping and papermaking utilization of waste paper with high wet strength, and the pulping and papermaking industry is still helpless so far. For example, there are still technical difficulties in the pulping of waste paper towels, waste kitchen wipes, and waste banknote paper. Therefore, the conventional treatment method of wet-strength waste paper is to be incinerated or landfilled as garbage. Since wet-strength waste paper contains a large amount of wet-strength agents or various heavy metal printing inks, if wet-strength waste paper is dir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/02D21C3/22D21C9/02D21C1/00D21D5/02D21C5/02
CPCY02W30/64
Inventor 陈彬
Owner CHINA NAT PULP & PAPER RES INST CO LTD