High shrinkage fiber properties and applications
High shrinkage fiber properties and applications
Shrink fiber is a new type of synthetic fiber. Fibers with a shrinkage rate of about 20% in boiling water are called general shrinkage fibers, while fibers with a shrinkage rate of 35% to 45% in boiling water are called high-shrinkage fibers.
At present, there are two common types of high shrinkage polyacrylonitrile fiber (acrylic fiber) and polyester fiber (polyester).
Compared with crystalline polymer fibers, polyacrylonitrile fibers have a unique structure. There are no strictly crystalline and amorphous regions, but only quasi-crystalline high-order regions and amorphous mid-order or low-order regions. district. This unique structure gives it unique thermoelasticity and can be made into high-shrinkage acrylic fiber for the production of acrylic bulked yarn.
High shrinkage polyester fiber is generally obtained by modifying crystalline polyester.
There are two main ways to produce high shrinkage polyester:
1. Adopt special spinning and drawing processes, such as using commercially available POY yarn through low-temperature stretching, low-temperature setting and other processes to produce high-shrinkage polyester with boiling water shrinkage of 15-50%;
2. Adopt chemical denaturation methods, such as using neopentyl glycol to prepare copolyester and spin it. Use this fiber to make combed top or spin it into yarn for dyeing. After making the fabric, it is heated at a temperature of about 180°C. , causing it to shrink, with a shrinkage rate of up to 40%.
High-shrinkage fiber is widely used in textile products. It can be blended with conventional products to form yarn, and then boiled or steamed in a tension-free state. The high-shrinkage fiber will curl, while conventional fiber will curl due to the constraints of high-shrinkage fiber. In a circle. dWKRiGN
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