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Stretch Yarns can be made in these different ways
2022-05-23
Stretch Yarns can be made in these different ways:
1. Elastomeric Yarns: These are made of rubber or elastane. A center core of the elastomeric yarn is wrapped with another fiber.
2. Bi-Component Yarns: These are made from two different types of man-made fibers, e.g. polyamide 6.6 with polyamide 12, being extruded through the spinneret at the same time. Their setting and shrinkage rates are different, which causes one of the yarns to pull more than the other, causing the yarn to distort into a crimp or spiral.
3. Bi-Constituent Yarns: These use two different types of polymer, e.g. Lycra with polyamide, being extruded through the spinneret at the same time.
4. Chemically Treated Natural Fiber Yarns: Cotton fibers are treated with resins or chemicals with thermoplastic properties and then treated in a similar manner to that of heat setting. However, due to the nature of cotton, the spring-like action is slow, and it may only return to 75% of its original shape until it has been washed. Slack mercerization of the cotton fabrics allows the fabric to stretch with 80% retention of the original size at first and full retention after washing.
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