Wet strength waste paper repulping process

A pulping and wet strength technology, applied in the field of wet strength waste paper repulping technology, can solve the problems of strength damage, fiber degradation, equipment corrosion, etc., and achieve the effects of reducing pollution, good fiber dispersion and mild treatment conditions

Inactive Publication Date: 2014-07-02
朱勇强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it is necessary to solve a series of problems such as environmental pollution, equipment corrosion, fiber degradation, and strength damage caused by the treatment of wet-strength waste paper with strong oxidants and strong acids.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] ①Surfactant penetrating hydration section: Put the waste paper to be shredded into the pulper at 5% of the absolute dry pulp concentration, soak it with water, and add 0.1% surfactant with strong penetrating effect (stock solution Calculated for absolute dry pulp), and then soaked at room temperature for 18 minutes; ②Acid pulping section: Add 1.0% aluminum sulfate (calculated as solid to absolute dry pulp) to the wet strength broken paper that has been pre-soaked above, And before adding, dissolve aluminum sulfate into a 10% aqueous solution. After adding, adjust the pH value to 4.5, heat up to 60°C, and then turn on the hydraulic pulper and pulp for 15 minutes; ③ Alkaline beating section: Adjust the PH value of the above slurry to PH 8 with NaoH, and then use a high-frequency deflaker to make pulp with a pulp concentration of about 5%, and then beat for 15 minutes to make a pulp with good fiber dispersion.

Embodiment 2

[0023] ①Surfactant penetrating hydration section: Put the waste paper to be shredded into the pulper at 5% of the absolute dry pulp concentration, soak it with water, and add 0.2% surfactant with strong penetrating effect (stock solution) Calculated for absolute dry pulp), and then soaked at room temperature for 15 minutes; ②Acidic pulping section: Add 1.5% aluminum sulfate (calculated as solid to absolute dry pulp) to the wet strength broken paper that has been pre-soaked above, And before adding, dissolve aluminum sulfate into a 10% aqueous solution. After adding, adjust the pH value to 5.0, heat up to 65°C, and then turn on the hydraulic pulper and pulp for 20 minutes; ③ Alkaline beating section: Adjust the pH value of the above slurry to 8.5 with NaoH, and then use a high-consistency hydraulic pulper to beat for another 20 minutes at a pulp concentration of 10% to produce a pulp with good fiber dispersion.

Embodiment 3

[0025] ①Surfactant penetrating hydration section: Put the waste paper to be shredded into the pulper at 7% of the dry pulp concentration, add water to soak it, and add 0.4% surfactant with strong penetrating effect (stock solution) Calculated for absolute dry pulp), and then soaked at room temperature for 20 minutes; ②Acidic pulping section: Add 1.5% aluminum sulfate (calculated as solid to absolute dry pulp) to the wet strength broken paper that has been pre-soaked above, And before adding, dissolve aluminum sulfate into a 10% aqueous solution. After adding, adjust the pH value to 5.5, heat up to 70°C, and then turn on the hydraulic pulper and pulp for 20 minutes; ③ Alkaline beating section: Adjust the PH value of the above slurry to PH 8.5 with NaoH, and then use a high-consistency refiner to beat for another 20 minutes at a pulp concentration of 15% to produce a pulp with good fiber dispersion.

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Abstract

The invention relates to a wet strength waste paper repulping process, and belongs to the technical field of papermaking. The repulping process is a novel three-stage composite process,which includes the steps of: 1, a surfactant osmotic hydration stage (adding 0.1-1% surfactant, and soaking for 15 to 30 min); 2, an acidic pulping stage (adding 1.0-3.5% of aluminum sulfate with pH value of 4.5-6.5, pulp concentration of 5-10%); and 3, an alkaline pulping stage (pH of 8-10,and pulp concentration of 5-30%). The process has the advantages of mild conditions, low energy consumption, low cost, good dispersion of fiber and good pulp quality, and is applicable to repulping of a variety of wet strength waste paper.

Description

technical field [0001] The invention relates to a wet-strength waste paper repulping process, which is a production technology of the waste paper repulping used in the wet-strength waste paper recycling repulping process. Background technique [0002] With the development of the paper industry, society's demand for paper grades has expanded, and papermaking raw materials are in short supply. Waste paper has increasingly become an important source of paper fiber raw materials, but not all waste paper is so easy to repulp. Various wet strength agents are widely used in the paper industry, which significantly improves and increases the wet strength performance of paper and expands the application range of paper types. However, due to the high strength of wet strength paper, it is difficult to break into pulp, giving wet strength The repulping and recycling of paper brings great difficulties. Therefore, finding an efficient wet-strength waste paper repulping process is of great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 朱勇强
Owner 朱勇强
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