Polyester Yarn Process

Basic process and 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, the physical properties of various raw materials are different, and the product quality requirements are different. 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 together, making the actual observation less work that was originally necessary)

(1) Process flow of pure cotton yarn

1. Carded yarn: blowing → carding → first and second → roving → spinning → post-processing

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

(2) The technological process of polyester-cotton blended 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, less 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, 40s single yarn, the twist of woven yarn is 99 twists/10cm, while the knitted yarn is about 88-89 twists.