False-twisted elastic yarn takes advantage of the thermoplastic properties of polyester, nylon and other synthetic fibers. When the fiber is twisted and curled, it is heated and set to fix its twisted and curled state to obtain fluffy, good elasticity without twist. The stretch yarn is called false-twisted stretch yarn because the yarn has a slight torque but no twist and has good elasticity.
There are five main types of false twisted elastic yarn
(1)
General false twisted silk
That is, the fiber is twisted into shape and untwisted. The silk thread maintains the bulkiness of the twisted state, but has no twist. The traditional processing method uses the above three-step method, but currently it is completed in one step on the false twist elastic yarn machine. Its fibers have good torsion and elasticity, so crepe fabrics and elastic fabrics with better crepe effect can be developed.
(2)
Really twisted and falsely twisted silk
In order to make the product obtain a comfortable effect due to the fluffiness of the false-twisted elastic yarn, and at the same time have ideal bundling properties so that the fabric can obtain a good texture effect, people add certain features to the false-twisted elastic yarn machine. The degree of twist creates real-twisted and false-twisted elastic yarn. At present, real twist and false twist elastic yarn can be completed on the false twist and real twist one-step texturing machine.
(3)
Slub silk
The false-twisted elastic yarn is mixed with other single filaments and twisted. Due to the overfeeding of the gap, the surface of the mixed fiber has regular bamboo segments. This bamboo segment is completely covered by the leather silk, instead of The bamboo segment is made of skin yarn and core yarn twisted side by side. This is the bamboo yarn developed on the market (Figure 9). There are more than 10 varieties currently developed, such as white polyester FDY (fully drawn yarn) as leather yarn, white polyester FDY as core yarn, knotty yarn that mainly embodies the embossed effect of the bamboo section. Common specifications are 240dtex/60f.
Cationic polyester FDY is leather filament and white polyester FDY is core filament. It mainly embodies the cationic color-absorbing effect of bamboo sections. Common specifications are 222dtex/54f and 226dtex/60f. White polyester FDY is Leather yarn and white nylon FDY are used as core yarns, mainly reflecting the white effect of bamboo segments. Common specifications are 222dtex/56f. (200 denier/56f), 222dtex/60f (200 denier/60f). The slub length of slub yarn ranges from 1 to 15cm. The number of slubs per meter can be adjusted from 3 to 10, and the tightness of the slubs can be adjusted. It can be tightly held without slipping, or it can slip due to loose holding.
(4)
Uneven false twist silk
Using MOY (medium-speed spinning) polyester or POY (pre-oriented yarn, high-speed spinning) polyester as raw material, it is made by drafting and false twisting on a one-step machine. In the drafting section due to the stretching The thick details of the yarn are different, and the false-twisted yarn is deformed to achieve both a thick appearance and fluffy performance. The textured yarn produced with thick details is called uneven false-twisted yarn.
Since the innovation and improvement of the false twist texturing machine allows two raw materials to be fed and processed simultaneously through dual wire channels, product varieties have been increased, such as uneven polyester with long slugs and short details. The silk is the skin, and the raw material formed by the network with FDY (fully drawn yarn) polyester as the core, can have 1 to 3 thick spots per meter, and no place has 2 to 6 cm of thick spots
It is a raw material formed by a network of uneven polyester yarn with short slugs and long details as the sheath and FDY polyester as the core. It uses cationic polyester with short stubs and long details as the sheath and FDY polyester as the core. The raw material formed by the network has short stub cationic polyester and short stub general polyester, and the raw material formed by the network, etc.
(5)
Mixed twist and false twist silk
In the process of yarn processing, there are two kinds of twist, positive and negative, in the twisting area and untwisting area. Therefore, generally speaking, the positive and negative twists offset each other and there is “no twist”, but in some parts of the yarn, there is Positive and negative twist, thus forming mixed twist and false twist textured yarn (Figure 10), which has single-strand andThere are two types of mixed fiber types.
The single-strand type is a single-filament mixed-twisted false-twisted yarn. The twisted section of the yarn shows a finer twist due to the tight wrapping of the fiber. In the untwisted section, the silk body is fluffy and has thick sections, and the lengths of twisted sections and thick sections can be adjusted. The mixed fiber type combines two types of single-filament mixed-twisted and false-twisted yarns to form a two-color effect, a different shrinkage effect, and three combinations of random polyester, cationic polyester and colored yarns of the two fibers.
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