Abstract
In this report the influence of the impurities (trash, dirt, etc. eventually accumulated in the turbines of the open-end machine) on the properties of yarns spun from cotton, blends, and man-made fibers is studied. It has been observed that, apart from an increase in end-breakage, parameters such as abrasion resistance, tensile strength, and resistance to repeated extensions decrease, and that yarn irregularity and yarn hairiness increase. It is also worth mentioning that the yarn presents periodic irregularities of varying wavelength, depending on the zone of the turbine where impu rities accumulate.
Either continuous cleaning of the turbine in machines with a device intended to do so, or periodic cleaning by the operator, tends to avoid inconveniences from accumulation of impurities, which can in turn cause yarn deterioration . and fabric faults.
Generally, the phenomenon is dependent on the degree of fiber cleanliness, and it is more frequent in cotton spinning than in spinning of man-made fibers and their blends.
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