Development of CM800 bicomponent fiber elastic fabric
PTT is a popular textile material that has been studied at home and abroad in recent years. It has natural elasticity, dimensional stability, dyeability and stain resistance, and can be used in various fields such as clothing, carpets, and nonwovens. At present, based on the research on PTT raw materials, a bicomponent fiber material with special elasticity-CM800 bicomponent fiber has been developed using the parallel composite spinning method.
The development of PTT/PET bicomponent fiber
Currently there are various polyester yarns with improved processing properties on the market, which are claimed to have “high elasticity”, but In fact, its elasticity will gradually decrease with wearing time and the number of washings. The advent of spandex core-spun elastic fabric has opened up a new field for clothing fabrics. Spandex elastic fiber fabric has many advantages, but there are also some shortcomings. For example, the fabric is difficult to handle during weaving and printing and dyeing processes, and it is easy to cause fabric curling and wrinkles. At the same time, it is difficult for the fabric to have good elasticity. It also has good dimensional stability.
At present, a new type of polyester CM800 is produced by using two raw materials, PTT and PET, using a parallel composite spinning method. It overcomes the shortcomings of spandex core-spun elastic fabric and makes the fabric not only have good With elasticity and dimensional stability, the clothing is comfortable to wear, easy to care for, and easier to control during processing.
Production of CM800 bi-component fiber stretch suede
The raw materials are 105D/36F island silk + 50D/32FPTT composite yarn, and the fabric is made of double-layer composite tissue. , the inner layer is made of island silk ultra-fine fiber, and the outer layer is made of PTT composite yarn alternately. Use a 2/4 type double-sided machine with a speed of about 20 revolutions per minute to reasonably control the movement of the knitting needle during the weaving process to reduce the triangle angle and yarn tension. In the case of no missing needles, the tension in the knitting area is 2 to 3 grams. Reduce the wear of knitting needles and sinkers. The fabric uses 2 yarn lengths. The yarn feeding strips are divided as required. All the odd numbers of the upper plate triangle are knitted in circles. The needle depth is adjusted to 3 to 3.2. All the even numbers are not needle-pressed or needle-pressed. The needles are lowered and Even numbers and odd numbers of lower needle barrels are alternately formed into circles, and the needle concentration is 3.5~3.9mm. By controlling the above weaving process, the tension fluctuation of the yarn is reduced, the elasticity of the fiber is protected to the maximum extent, and the best horizontal and vertical elasticity requirements are achieved.
The alkali quantity process uses fixed cylinder overflow to achieve certain process degradation weight loss requirements. During the dyeing and finishing process of PTT composite fiber, the elastic morphological structure must not be damaged, otherwise the elasticity and elastic recovery of the product will be affected. Since the alkali resistance of PTT composite fiber is better than that of spandex, the elasticity and breaking strength of the fiber are maintained during the alkali loading process, and preparations are made for the subsequent process of sea-island silk fiber opening.
PTT composite fiber can be dyed with disperse dyes. When dyeing with disperse dyes, PTT dyes quickly, so it has a different color from polyester filaments. Special attention should be paid to the rationality of the dyeing prescription. Use high-temperature and high-pressure dyeing agents for dyeing. The dyeing temperature should be controlled below 125°C and should not be too high. When the temperature drops to 80°C, it must be washed with overflow water for 5 minutes to remove the dark color produced when the temperature rises and the color changes, prevent the fabric from wrinkles, and ensure the uniformity of PTT shrinkage. Pay special attention to the temperature when setting. On the premise of meeting the shrinkage rate, reduce the setting temperature as much as possible. The setting temperature should be between 160°C and 170°C.
The raising equipment adopts a domestic 24-roller frequency conversion device raising machine, and the sanding adopts a domestic vertical sanding machine. The CM800 bi-component fiber elastic suede fabric produced has a soft and plump feel, stable dimensions, and excellent wrinkle resistance. sex, recognized by the market.
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