涤纶单丝的张力热定型工艺研究

Study on Tensile Heat Setting Process of Polyester Monofilament

涤纶单丝广泛应用于经编间隔织物,作为承力单元单丝的力学性能很大程度上决定了织物的抗压缩性能。研究了单丝的热定型工艺对其力学性能和微观结构的影响,通过对涤纶单丝进行不同温度和时间的张力热定型处理,测试定型前后单丝的单向拉伸性能和结晶度,分析了热定型时间和温度与单丝初始模量和结晶度的关系。结果表明,随着热定型时间的增加,涤纶单丝的初始模量先增大后减小;热定型温度为180℃时,涤纶间隔单丝的初始模量大于200℃时的初始模量;张力热定型提高了涤纶单丝的结晶度。最佳热定型工艺是180℃,时间20 s。

Polyester monofilaments were widely used in warp-knitted spacer fabrics. As the main load carrier,the mechanical properties of monofilament largely determined the compression resistance properties of the resultant spacer fabrics. The effect of heat setting on the mechanical properties and microstructure of polyester monofilament was studied. The polyester monofilament was subjected to heat setting under tension at different temperatures and times. The uniaxial tensile properties and crystallinity of the monofilament before and after heat setting were tested. The relationships between heat setting time and temperature and the initial modulus and crystallinity of the monofilament were analyzed.The results showed that with the increase of heat setting time,the initial modulus of polyester monofilament increased first and then decreased.When the heat setting temperature was 180 ℃,the initial modulus of polyester monofilament was greater than that at 200 ℃. Heat setting under tension increased the crystallinities of polyester monofilaments. The optimal heat setting condition was found to be 180 ℃ for 20 s.