What is false twisted stretch yarn? What types does it have?

False-twisted elastic yarn is made of polyester, nylon and other synthetic fibers with thermoplastic characteristics. Sometimes it is also called DTY yarn(draw texturing yarn).When the fiber is twisted, crimped and deformed by heating, the twisted and crimped state is fixed to obtain fluffy, elastic, and twist-free elastic yarn. Because the yarn has a slight torque and no twist, it has better elasticity, so it is called false twisted elastic yarn.

(1) General false twisted yarn: that is, the fiber is twisted to a certain shape and then untwisted. The yarn maintains the bulkiness of the twisted state, but has no twist. The traditional processing method adopts the above three-step method, and is currently completed in one step on a false twist stretch yarn machine. Its fibers have good torsion and elasticity, so crepe fabrics and elastic fabrics with good crepe effect can be developed.

(2) Real twisted false twisted yarn: In order to make the product comfortable due to the fluffy false twisted elastic yarn, it also has a better bunching property, so that the fabric can obtain a good weaving effect. A certain twist is added to the silk machine to form a real twist false twisted elastic yarn. At present, the real twisted false twisted elastic yarn can be completed on a false twisted one twisted texturing machine.

(3) Slub yarn: False twisted elastic yarn is mixed with other monofilaments and twisted. Because the gap is over fed, the surface of the blended fiber has regular bamboo segments, and this bamboo segment is completely covered by the skin. Instead of the bamboo segment, the skin silk and the core silk are twisted side by side. This is the bamboo silk developed in the market . At present, there are more than 10 kinds of varieties, such as white polyester FDY (full-stretched yarn) as leather yarn and white polyester FDY as core yarn, which mainly reflects the ridge effect of bamboo joints. Common specifications are 240dtex / 60f.

Cationic polyester filament FDY is a leather yarn and white polyester FDY is a core yarn. Polyester mainly reflects the cationic color absorption effect of bamboo. The common specifications are 222dtex / 54f and 226dtex / 60f. White polyester FDY is leather yarn and white nylon FDY is core yarn, which mainly reflects the white effect of the bamboo section of the Jin Lisi, common specifications 222dtex / 56f (200 denier / 56f), 222dtex / 60f (200 denier / 60f). The length of slubs is 1 ~ 15cm, and the number of slubs per meter can be adjusted within 3 ~ 10. The tightness of slubs can be prevented from slipping due to tight clasping, or it can be caused by looser clasping. Slip.

(4) Non-uniform false twisted yarn: Made of MOY (medium-speed spinning) polyester or POY (pre-oriented yarn, high-speed spinning) polyester as raw materials, and made by drawing and false twisting on a one-step machine. In the drafting section, the coarse details of the yarn are produced due to the difference in stretching. The deformation of the yarn in the false twisting section achieves both the thickness and appearance of fluff. The production of the textured yarn with coarse details is said to be uneven. False twisted silk.

Due to the innovation of the false twist texturing machine, it is allowed to feed two raw materials simultaneously through the double yarn path, thereby increasing the product variety, such as the use of uneven polyester yarns with long thick sections and short details, and FDY (full stretch) (Silk) Polyester is the core, and the raw materials formed through the network can have 1 to 3 places per meter, and nowhere is 2 to 6 cm thick.

The raw material is formed by using uneven polyester yarns with short thick sections and long details as the skin and FDY polyester as the core through the network. The raw materials formed by the cationic polyester with short thick sections and long details as the skin and the FDY polyester as the core are formed by the network, and the raw materials formed by the network are composed of the cationic polyester with short thick sections and the general polyester with short thick sections.

(5) Twisted false twisted yarn: In the sliver processing, there are two kinds of twists, positive and negative, in the twisting zone and untwisting zone. Therefore, the positive and reverse twists are canceled and “untwisted”. Part of the strip has positive and negative twists, thus forming a mixed twist false twist textured yarn, which has two types: single-strand and mixed-fiber.

The single-strand type is a monofilament mixed twisted false twisted yarn. The twisted section of the sliver shows a thin knuckle due to the tight binding of the fiber, while the untwisted section has a fluffy and thick knot, and the knuckle and thick knot. The length can be adjusted. The mixed fiber type is to combine two kinds of monofilament mixed false twisted yarns to form a two-color effect, a different shrinkage effect, and form three kinds of combinations of random polyester yarns, cationic polyester yarns, and colored yarns.