Polyester Color Yarn Process

　　Tops→blending→needle→combing→roving→spinning→doubling→twisting→inspection→packing of finished products.

　　Spinning fibers into yarn generally go through the main processes of blowing, carding, drawing, roving, and spinning. Yarns and threads for high-end products also require additional combing operations.

　　Different processing procedures are required to produce cotton yarns with different requirements, such as spinning pure cotton yarns and polyester-cotton blended yarns. Due to the different raw materials used, different physical properties of various raw materials, and different product quality requirements, when processing Different production processes are required. (With the update of modern equipment, the process has also been adjusted to varying degrees, and the equipment can merge some of these processes, making the actual observation less work than was originally necessary)

　　(1) Process flow of pure cotton yarn

　　1. Carded yarn: blowing→carding→head merging→second merging→roving→spinning yarn→post-processing

　　2. Combed yarn: blowing→carding→pre-coupling→sliver roll→combing→head-coupling→two-coupling→triple-coupling→roving→spinning→post-processing

　　(2) The technological process of polyester color yarn

　　1. Carded yarn: raw cotton: blowing→carding→

　　→Heading→Secondary→Triple→Roving→Spinning→Post-processing

　　Polyester: Blowing → Carding →

　　2. Combed yarn:

　　Raw cotton: blowing → carding → pre-combing → sliver roll → combing →

　　→Heading→Secondary→Triple→Roving→Spinning→Post-processing

　　Polyester: blowing → carding → pre-merging →

　　The difference between weaving yarn and knitting yarn

　　Woven yarn requirements: high strength, fewer neps.

　　Knitting yarn is relatively stronger than woven yarn but requires high details, and the twist is not as high as that of woven yarn.

　　Generally, the twist coefficient of woven yarn is about 380, while knitting yarn only needs about 340.

　　For example, in 40s single yarn, the twist of woven yarn is 99 twists/10cm, while the knitted yarn is about 88-89 twists.