氨纶与双组分复合长丝/棉包芯纱的拉伸弹性

为改善传统弹力包芯纱弹性回复性能,以氨纶、双组分复合长丝(CM800)为芯纱,棉纤维为外包纤维,设计了13种弹力包芯纱。探讨氨纶预牵伸倍数、芯纱线密度和弹力包芯纱反复拉伸次数与弹性回复率之间的关系。采用纱线强伸仪测试氨纶/棉、CM800/棉和棉双丝弹力包芯纱的拉伸弹性。结果表明:氨纶的牵伸倍数越大,弹力包芯纱的弹性回复率越小;随着氨纶线密度的增加,包芯纱的弹性回复率先增加后减少;CM800线密度越小,包芯纱的弹性回复率越小;氨纶/棉、CM800/棉和棉双丝弹力包芯纱的定伸长5%和定负荷200 c N反复拉伸次数与纱线弹性回复率的关系均符合幂函数关系,且弹力包芯纱的弹性回复率随着纱线反复拉伸次数的增加而降低;CM800/棉包芯纱的弹性回复率最大,氨纶/棉包芯纱的弹性回复率最小。

Tensile elasticity of spandex and bi-component filament/cotton core-spun yarn

In order to improve elastic recovery of conventional elastic core-spun yarn,13 kinds of elastic core-spun yarns were designed taking Lycra and bi-component filament(CM800) as the core-spun yarn and cotton fiber as the outer wrapping fiber.The relationships between the pre-drafting ratio of Lycra,the linear density of core-spun yarn,repeated extension times and elastic recovery percentage of elastic core-spun yarns were studied.This study utilized yarn tensile tester to test the tensile elasticity of spandex/cotton,CM800/cotton and elastic core-spun yarn of cotton/double filament.The result shows that the greater the pre-drafting ratio of spandex,the smaller the elastic recovery percentage of elastic core-spun yarn;and with the increase of the linear density of spandex,elastic recovery percentage of core-spun yarn firstly increases and then decreases.The elastic recovery percentage of core-spun yarn has positive linear correlation with the linear density of CM800.The elastic recovery percentage of elastic core-spun yarn was power-function associated with the repeated extension time of yarn at elongation of 5％ and yarn constant load of 200 cN.With the increase of yarn extension time,the tensile recovery percentage of elastic core-spun yarn decreases.For all the yarns,the elastic recovery percentage of CM8OO/cotton core-spun yarn is the greatest and the elastic recovery percentage of spandex/cotton core-spun yarn is the smallest.