Abstract:

 In order to improve elastic recovery of conventional elastic core-spun yarn, 13 kinds of elastic core-spun yarn were designed taking Lycra and bi-component filament (CM800) as the core-spun yarn and cotton fiber as the outer wrapping fiber. The relationship between the pre-drafting ratio of Lycra, the linear density of core-spun yarn, repeat extension times and elastic recovery percentage of elastic core-spun yarn 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 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 elongation 5% and yarn constant load 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 CM800/cotton core-spun yarn is the greatest and the elastic recovery percentage of spandex/cotton core-spun yarn is the smallest.

Key words: apsndex, bi-component filament, elastic core-spun yarn of cotton/double filament, tensile recovery percentage