Sizing is a process in which a slurry is applied to a warp yarn to improve its woven properties. After sizing, a part of the slurry adheres to the surface of the warp yarn, forming a slurry film around the thread to resist the friction of various equipment; another part of the slurry penetrates between the fibers, and the fibers are adhered to improve the thread. Bundling and strength, so as to ensure the smooth completion of the tasks of the subsequent process. The sizing with the slurry adhered to the surface of the warp yarn is called sizing sizing, and the sizing with the slurry penetrating into the fibers is called soaking sizing. The sizing is at the heart of the previous process, making weaving possible by protecting the weaving.

Sizing method:

There are six main methods of sizing of warp yarns.

(1)Warp beam sizing

A plurality of warp yarns on the warp beam are simultaneously taken out, immersed in the slurry, the remaining liquid is pressed, dried, and separated, and finally wound into a weaving shaft according to a predetermined length. This is the most widely used sizing method.

(2)Woven shaft sizing

The woven shaft made of the slit warping machine is pulverized and then wound into a woven shaft. This method is mostly used for multi-variety and small-volume production of silk weaving and yarn-dyed.

(3)Pulp joint

The sizing and drying equipment is installed between the creel and the winding mechanism of the warping machine, and the sizing and sizing are combined into one process, and are mostly used for sizing of chemical fiber filaments.

(4)Dyeing combined

Dyeing and drying equipment is installed in front of the sizing machine, so that the sizing yarn is dyed, dried, and then sizing, dyeing and sizing as a process, and is used for warp sizing which needs dyeing, such as the color of woven labor cloth.

(5)Single yarn sizing

The single yarn is withdrawn from the bobbin, sizing it through a single yarn sizing machine and then winding it into a sizing bobbin. The single yarn sizing machine is made by adding a sump and drying mechanism to the low speed winder. Although this method has low yield and high labor consumption, the quality of the serosa is good, and it is sometimes used in silk weaving and ramie weaving.

(6)Skein sizing

There are two ways of manual and mechanical, which are to soak the skein in the slurry, wring it, shake it, and then dry it. This method is suitable for small batch production such as yarn dyeing and webbing.

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