Desizing refers to treating the fabric with an acid, a base, an enzyme, etc. to remove the processing of the slurry applied to the warp yarn during weaving. The purpose is to facilitate subsequent processing such as refining. During the weaving process, the warp yarns are subjected to large tension and friction and are prone to breakage. In order to reduce the warp and improve the weaving efficiency and the quality of the fabric, the warp yarn needs to be sizing before weaving (the warp is padded in the slurry and then dried), so that the fibers in the yarn adhere and cohesively form on the surface of the yarn. A strong film of the film makes the yarn tight and smooth, which improves the breaking strength and wear resistance of the yarn and facilitates weaving. The slurry affects the wettability of the fabric during the dyeing process and hinders the chemical from contacting the fibers. Therefore, the fabric is generally desizing first. This process removes most of the slurry from the original fabric to facilitate scouring and bleaching while also removing some of the natural impurities.

 

Evaluation of desizing effect:

The desizing effect is expressed as the desizing rate, which is calculated as follows。

Desizing rate (%) = (grain slurry rate – fabric slurry rate after desizing) / gray cloth slurry rate

In the production, the desizing rate is required to be above 80%, or the residual pulp is less than 1% of the fabric.

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