Due to its increasing importance, the circular economy concept has encouraged spinners to produce sustainable products. We investigated the proper use of recycled fiber, from spinning waste, as a low cost and sustainable raw material to spin blended yarn. The increasing ratio of recycled fiber is known to affect the final yarn quality. Compromise between cost and quality of yarn prepared from recycled fibers was approached using the analytic hierarchy process (AHP). Results show that AHP was a suitable approach to convert a subjective assessment (expert opinion) for an objective decision maker. A mixture of 80% recycled fibers and 20% virgin cotton (Malian) was selected as an optimal raw material to spin blended yarn with, obtaining a better compromise between quality and manufacturing cost.
Improving raw material exploitation has become the most important challenge facing scientific and industrial community. In this paper, we have studied the effect of percentage of fibres recovered from cotton wastes and different spinning parameters on the hairiness, the uniformity and the level of irregularity of the rotor yarn. Results indicate that yarn count, rotor parameters (diameter and form) and rotor speed have an effect as significant as waste proportion. With a good choice of spinning parameters, an introduction of 25% on waste in the first passage in the drawing frame does not alter the uniformity and the appearance of rotor yarn.
In this study the normality of the cotton fiber length number distribution and weight distribution are tested by using the Chi-2 statistic test. Good correlations between the cotton fiber length distribution by weight and the normal distribution with the same mean and standard deviation are obtained. This test further shows that length distribution by numbers cannot be characterized by normal law. Then, the staple diagram and the fibrogram by weight are mathematically generated from a normal fiber length distribution. After that, mathematical models relating the most common length parameters to the mean length and the coefficient of variation are established by solving the staple diagram and the fibrogram equations. Finally, the length parameters of binary blends are studied and their variations in terms of the components of the blend are shown. These variations are nonlinear for most of the blend length parameters in contrast to other studies and models usually used by the spinners that suppose that the blend characteristics and particularly length parameters are linear to the components ratios.
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