Method for preparing non-woven fabric through multi-effect composite dewatering and bleaching

Abstract

The invention discloses a method for preparing a non-woven fabric through multi-effect composite dewatering and bleaching, and belongs to the technical field of bleaching. The method comprises the following steps of (1) performing opening, carding and web forming: performing opening, carding and web forming on cotton fibers to obtain a cotton web; (2) performing dewatering and bleaching before spunlacing: enabling the cotton web treated in the step (1) to be subjected to cold batch treatment in supercritical carbon dioxide fluid, wherein the supercritical carbon dioxide fluid contains a composite bio-enzyme agent, and the composite bio-enzyme agent comprises cellulase, pectinase, proteinase and lipase; (3) performing spunlacing: performing spunlacing on the cotton web treated in the step (2); (4) performing dewatering and bleaching after spunlacing: performing normal-temperature cold-batch treatment on the cotton web treated in the step (1) in a chemical cold-batch agent dissolved with ozone for 20-45 minutes, wherein chemical cold-batch liquid comprises hydrogen peroxide and sodium hydroxide, and the concentration of the ozone in the water is 1-8 mg / L; and (5) performing water washing and drying: performing water washing and drying on the cotton web treated in the step (4) to obtain the product.

Description

technical field [0001] The invention belongs to the technical field of bleaching, in particular to a method for preparing non-woven fabrics through multi-effect composite bleaching. Background technique [0002] At present, the combination of cold pile technology and spunlace can not only degrease and bleach cotton to achieve the purpose of energy saving and emission reduction, but also further reduce the energy consumption of the entire cotton spunlace production line. Therefore, the cold pile technology is very suitable for the spunlace process. For example, the patent application number CN201710618198.3 discloses a spunlace non-woven fabric production process for cold stack degreasing of raw cotton, which adopts bleaching first and then stabbing, high alkali oxygen concentration, and long cold stacking time (16-22 hours). For example, the patent application number CN201710046631.0 discloses a production process of pure cotton spunlace non-woven fabrics by cold stacking m...

AI Technical Summary

Problems solved by technology

However, supercritical carbon dioxide fluid is mainly used in the desizing or dyeing process of textiles, and has not been reported in the debleaching process.