The weft insertion of Air jet loom textile machine relies on air beam and belongs to free weft insertion. It has the highest weft insertion rate in the new loom, especially the maturity of special-shaped reed and relay nozzle technology. It reduces the loss of air beam and makes weft insertion more efficient. As the speed of weft insertion speeds up, the air drag on the yarn increases, which requires higher weft strength and lower coefficient of variation of single strength, and more stringent requirements for weft bobbins.
At the same time, due to the bigger beating-up force and tension of Air jet loom textile machine
, the bigger density of reed, heddle, warp stop and warp yarn arrangement, Warp yarns are subjected to physical and mechanical conditions such as large tension, small opening, strong beating-up and opening frequency as well as the greater friction and extrusion during weaving. It is required that warp yarn should have higher strength, better wear resistance, evenness, hairiness and less knot, which also puts forward higher requirements for winding, warping and sizing processes.
In the past, the purpose of warp sizing was attributed to strengthening, stretching and wear resistance. However, many actual production conditions in cotton textile industry indicate that the understanding of sizing purpose in the past is incomplete. The main purpose of warp sizing should be wear resistance and flattening hairiness, and keep the original elasticity of warp yarn as far as possible. The yarn sizing requirement of Air jet loom textile machine is higher and stricter than shuttle loom. Clear opening is more important for smooth weft insertion of Air jet loom textile machine, which is determined by the special weft insertion mode of Air jet loom textile machine and the characteristics of high speed, large tension, small opening and large width. In order to improve sizing technology, it is very important to determine sizing material, sizing technology and sizing method according to the special conditions of Air jet loom textile machine.