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Textile Process--Sizing Part 1

Sizing is an important step in the textile process. Its main purpose is to improve the strength, smoothness and wear resistance of the yarn during the weaving process, thereby ensuring the smooth progress of weaving and improving the quality of the cloth.


The sizing process can be roughly divided into the following steps:

1. Slurry preparation: First, the slurry needs to be prepared. Commonly used slurries include starch (such as corn starch, wheat starch), polyvinyl alcohol (PVA), carboxymethylcellulose (CMC), etc. These slurries are mixed with water in a certain proportion and heated to an appropriate temperature to fully dissolve and form a slurry with a certain viscosity.


2. Sizing: Dip the pre-wetted yarn evenly into the slurry so that the slurry can fully penetrate into the yarn and increase the volume and weight of the yarn. In this process, the sizing effect can be adjusted by controlling factors such as the sizing speed, slurry tank length, and slurry concentration.


3. Sizing: After the yarn comes out of the slurry, it will go through a squeezing device to remove excess slurry to avoid excessive thickness of the sizing film from affecting subsequent weaving. Subsequently, drying or hot air treatment may be performed to accelerate the curing of the slurry and form a tough and smooth surface.





4. Finishing: The sized yarn also needs to be warped, that is, multiple sized yarns are arranged neatly and wound onto the warp beam to prepare for weaving. During the warping process, it is necessary to ensure that the yarn tension is consistent to avoid breakage or weaving defects during weaving. The selection and parameter setting of the sizing process directly affects the quality and production efficiency of the fabric. Different types of fabrics and weaving methods have different requirements for sizing. For example, fine fabrics and high-speed looms often require more uniform and thinner sizing films to ensure smooth weaving.

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