Abstract:

In order to reduce the loss of hemp fiber of cotton/ hemp blended yarns on cotton spinning systems, 3 experiments are designed: a pretreated cotton and hemp carding blend system, a pretreated cotton and pretreated hemp carding blend system and a pretreated cotton and hemp combing blend system, based on the equipment modification of cotton spinning systems. By comparing the loss and quality of the cotton/hemp blended yarns of 3 designed systems with original spinning systems, the optimal low-loss process derives from the pretreated cotton and hemp combing blend system, i. e. , yarns are spun by preterating the raw coton and mixing with hemp on modified opening, cleaning, carding and combing devices. The losses reduce by 16.7%, yarn evenness declines slightly but within an acceptable range and the tensile fracture properties of yarns have no significant difference. The pull rate increases from 65% to 87.1%, reducing the cost of hemp products.

Key words: hemp fiber, low-loss optimization, pull rate, variation coefficient, tensile strength