Download e-book for iPad: A Practical Guide to Fibre Science by N. S. Kaplan

By N. S. Kaplan

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Since the variations are innumerable, it is a must to optimise the process parameters to produce a good quality yarn at a lower manufacturing cost. Some information and guidelines for fixing parameters is given in the following pages. Theory without Practice is sterile, and Practice without Theory is futile. Yarn occupies the intermediate position in the manufacture of fabric from raw material. Yarn tests are therefore essential, both for estimating the quality of the raw material and for controlling the fabric produced.

Drawframe contributes less than 5% to production cost of yam. The quality improvements are obtained at the cost of additional expenditure on machines, floor and personnel, together with a loss of rawmaterial. Cambing process The greatest loss is the loss of self-confidence: Processing of Textile Fibres 25 Roving bobbin is the ideal package form for supply of material to the ring spinning frame. Eventhough drawframe produces a sliver that already exhibits all the characteristics required for making the yam, the roving frame is forced upon a spinner as a necessary evil for two reasons.

5% span length) x 100 uniformity index == (mean length / upper half mean length) x 100 Short Fibers The negative effects of the presence of a high proportion Processing of Textile Fibres 35 of short fibres is well known. A high percentage of short fibres is usually associated with: Increased yam irregularity and ends ddown which reduce quality and increase processing costs Increased number of neps and slubs whiich is detrimental to the yam appearance Higher fly liberation and machine conttamination in spinning, weaving and knitting operations.

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