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The elastic weft yarn produced by the company is a two-component coating structure. The inner core is PA66UDY. The outer layer is covered with long-staple cotton and then twisted. It has high initial tensile strength and high elongation after dipping. Goodness and other advantages. During the fabric dipping heat treatment process, the fiber has small loss of strength and extendability, maintains the stability of the fabric, and has excellent thermal stability and mechanical deformation resistance.