In the stretching process of recycled polyester staple fiber during production, the fiber molecules generate heat due to the stretching work, which increases the temperature of the fiber. In the production process of recycled polyester staple fiber, due to the higher yield strength of polyester, the stretching The stress is large, and the drawing of polyester staple fibers generates more heat than the drawing of most fibers, which has a significant impact on the production of the drawing process.
There are two types of stretching processes for post-treatment of recycled polyester staple fibers: primary stretching and secondary stretching. Primary stretching is adopted by a few production lines, and the stretching medium is water and steam. For example, the production of two-dimensional crimped hollow polyester staple fiber generally adopts primary stretching. Secondary stretching is used by most production lines, but the stretching process is different. There are four types of stretching at home and abroad: one water and one steam process, two water process, one water and one dry process, and one dry and one steam process.
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