The strength of polyester staple fiber is relatively high, but there are many hairiness. In the weaving process, the adhesion of hairiness causes the opening to be unclear and the warp yarn to break. Therefore, polyester staple fiber sizing is focused on hairiness, smooth yarn body, reducing the unclear opening in weaving, and at the same time, a complete and tough film should be formed to improve the abrasion resistance of the yarn in the weaving process and reduce the Head, improve weaving efficiency.

Because the water jet loom uses the frictional traction force generated by the water stream to the weft yarn to introduce the weft yarn fixed on the bobbin into the shed, when the polyester staple fiber is sizing, in addition to the above sizing requirements, the sizing-formed film must be continuous with water. It is complete, and the warp yarns do not change significantly in their mechanical properties and appearance.