The basic technology and process of yarn

Top→Mixed sliver→Needle comb→Roving→Spinning→Bundling→Shaking→Inspection→Packing of finished products.
Spinning fibers into yarn generally goes through the main processes such as blowout, carding, drawing, roving, and spinning. Yarns and threads used in high-end products also require additional combing processes.
The production of cotton yarn with different requirements requires different processing procedures, such as spinning pure cotton yarn and polyester-cotton blended yarn. 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 renewal of modern equipment, there are also various degrees of adjustments in the process. The equipment can merge some of these processes together, so that some work that was originally necessary is missing in the actual observation)

(1) Pure cotton yarn process

1. Carded yarn: clear flower → carding → head doubling → double doubling → roving → spinning → post-processing
2. Combed yarn: clearing → carding → pre-combining → sliver → combing → head combining → double combining → triple combining → roving → spinning → post-processing

(2) Process flow of polyester-cotton blended yarn

1. Carded yarn: raw cotton: clear flower → carded cotton →
→ Head-in-line → Double-in-line → Triple-in-line → Roving → Spinning → Post-processing
Polyester: clear flower → carding →
2. Combed yarn:
Raw cotton: blow-out → carding → pre-combining → sliver → combing →
→ Head-in-line → Double-in-line → Triple-in-line → Roving → Spinning → Post-processing
Polyester: clearing → carding → pre-bonding →
The difference between weaving yarn and knitting yarn
Woven yarn requirements: high strength, less neps.
The knitting yarn is not as strong as the woven yarn, but the detail requirements are high, and the twist is not as high as the woven yarn.
Generally, the twist coefficient of woven yarn is about 380, while knitting yarn only needs about 340.
For example, 40s single yarn, woven yarn twist is 99 twists/10cm, while knitting yarn is about 88-89 twists.

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