摘要
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。
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 c N.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 CM800/cotton core-spun yarn is the greatest and the elastic recovery percentage of spandex/cotton core-spun yarn is the smallest.
引文
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