Technological process of spinning core spun yarn

Spinning process~

At present, there are two processes of spinning core spun yarn, taking the processing of polyester cotton core spun yarn as an example.

Roughing system:

Cotton: one end of the combed cotton - ROVING - spinning (core covering).

Combing system:

Cotton: one piece of pure cotton, one roll, one combed, one combed, two one combined, three one roving one spun yarn (core).

In the actual processing process, the selection of core spun yarn process depends on the yarn forming requirements the number of spun yarns. The general principle is that if coarse combing can be used, combing will be used. If combing system is to be used, the process can be shortened to reduce the production cost. If some manufacturers combed sliver thousands of unevenness, fiber straightness parallelism are good, after a draw can meet the coating requirements. Then, the process can adopt:

Cotton: a piece of cotton that is combed, combed spun (core spun).

Raw material selection:

Selection of core wires:

The size of the core fiber the number of single fibers in it should be selected according to the use of the fabric the number of spindles. For core fibers of the same size, the finer the monofilament is, the more pieces there are, the softer smoother the fabric will be; on the contrary, the less pieces there are, the better the rigidity straightness of the fabric will be. For coated products, the luster of core wire does need to be taken into account, the polished core wire can be used to reduce the production cost; for exposed products, the luster of core wire shall be taken into account, the polished wire shall be used as far as possible, so that the product will cause aurora affect the use effect.

For example, to produce 11.8tex (50s) polyester cotton core spun yarn, as skirt material shirt fabric, it is advisable to ordinary low strength high elongation 5.56tex (50D) / 24F semi gloss polyester filament as core yarn. When core spun yarn is used as sewing thread, the high strength low elongation bright polyester filament with more than 7.78tex (70D) / 36F monofilament is generally selected. When it is used for ragged coat material, it can be made of 7.56tex (68D) / 36F bright polyester filament. But for the core spun yarn of burnt out fabric, the size of the core yarn should be larger. Generally, 7.22-8.33tex (65-75d) / 36F matt semi gloss polyester filament is used to prevent the burnt out part being too thin causing aurora.

The core spun yarn used in elastic fabric can be selected according to the fabric use. Generally, polyester type 7.78tex (70D) spandex fiber is selected, its draft ratio is about 3.8 times. The medium (medium low count) spandex core spun yarn for meridional strong corduroy elastic labor cloth has a larger draft, about 3.8-4.0 times, which can ensure that when the elastic pants are taken, the buttocks knees have a relatively resilient force.

Selection of outsourcing fiber:

If cotton fiber is used as the outer fiber, theoretically, raw cotton with long length, high count good maturity should be selected as far as possible. But it depends on the purpose of the product. If it is used for high-speed sewing thread, but for shirt fabric skirt material, other ragged decorative cloth, it is necessary to good raw cotton, because they do need to undergo the test of strong friction high-temperature melting like high-speed sewing thread, will produce "peeling" phenomenon, so the raw cotton of 30mm length can meet the requirements. However, there are less neps impurities in the outer cotton of core spun yarn used for rotten fabrics. For example, it is better to use rayon as the outer fiber, with low strength, good dyeing performance less NEP impurities.