Production technology of extra low viscose refined cotton

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...

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