Production technology of extra low viscose refined cotton

A production process and technology for refining cotton, applied in textiles and papermaking, washing/replacement of pulp treatment liquid, pulp bleaching, etc., can solve the problems of large amount of NaOH, long cooking time, low production efficiency, etc., to reduce the difficulty and cost of governance , Small fluctuation range, the effect of reducing the amount of waste water

Active Publication Date: 2006-01-11
HUBEI JINHANJIANG REFINED COTTON
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AI Technical Summary

Problems solved by technology

Its shortcomings are: cooking and bleaching are completed at one time, the cooking time is too long, the production efficiency is low, the amount of NaOH is large, the purity of the product α-fiber is low, and the degree of polymerization of the finished product has a large range of fluctuations and is unstable.
Wastewater treatment is difficult and energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] 1. Material selection

[0015] When selecting materials, choose cotton linters with maturity ≥ 80%, no impurities in appearance, no foreign fibers, and fiber length between 8-10mm as raw materials.

[0016] 2. Cooking

[0017] a. Pre-cooking: put the raw materials into the steaming ball, add NaOH and Na 2 SO 3 The aqueous solution, pH value 8-10, dissolving ratio 1: 3-5, containing NaOH and Na by weight 2 SO 3 In the aqueous solution, the concentration of NaOH is 3.6-4.0%, Na 2 SO 3 The concentration is 1.0-1.1%, at a temperature of 10-30°C, turn the steaming ball and cook for 15-30 minutes;

[0018] b. The first stage of cooking: Then control the temperature in the steaming ball at 130-150°C, control the pressure at 0.3-0.6MPa, and turn the steaming ball to cook for 30-50 minutes in the first stage;

[0019] c. Final steaming: Control the temperature inside the steaming ball between 166-177°C, control the pressure at MPa 0.6-0.8, and rotate the steaming ball for...

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Abstract

The production process of extra low-viscosity refined cotton includes the following steps: (1) selecting material; (2) cooking; (3) washing pulp; (4) pretreatment for bleaching; (5) bleaching; and (6) rolling, dewatering and drying to obtain finished product. It uses cotton linters whose maturity is greater than or equal to 80%, appearance does not impurity or other fibre and fibre longth is 8-10mm as raw material, its cooking step adopts sectional cooking, and the bleaching step adopts sectional bleaching.

Description

technical field [0001] The invention relates to a production process of refined cotton, more specifically to a production process of ultra-low viscosity refined cotton with a viscosity of less than 10 mPa·s. Background technique [0002] Ultra-low viscosity refined cotton refers to refined cotton with a viscosity below 10mPa·s, which is an important raw material for CMC for papermaking. At present, there is no ultra-low-viscosity refined cotton manufacturer in China, and there is no data report on the production process of ultra-low-viscosity refined cotton. The traditional ordinary refined cotton production process generally adopts the following production processes: 1), material selection; 2) cooking: put the cotton linters into the steaming ball, add alkali, and cook; 3) pulp washing: wash the cooked pulp 4) Pretreatment before bleaching; 5) Bleaching; 6) Rolling dehydration and drying to make finished products. Such as: CN1470688A (application number: 02128307.9) discl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/16D21C9/02
Inventor 周家贵
Owner HUBEI JINHANJIANG REFINED COTTON
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