Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

IMPACT OF STRIKING FORCE OF CARDING TAKER-IN CLOTHING ON FIBRE BREAKAGE IN SPINNING TECHNOLOGY (Pages : 5 - 8)

One of the ways to increase production rate and cleaning efficiency of the card in the manufacturing of cotton yarn is to increase rotational speed of different rollers of the machine. However, higher rotational speed of rollers with saw toothed metallic clothing is often considered to be a cause of fibre damage that ultimately lowers strength of yarn. Review of research works on cards shows that fibre damage or deterioration in the zone of the feed roller and the taker-in is influenced by various factors other than higher speed of the taker-in. But influence of the taker-in rpm alone and the nature of damage or deterioration of fibres in this zone are not enough clear. This paper has examined one of the very important aspects of fibre damage – breakage of fibre due to high rpm of the taker-in of the card - from a novel view point. According to this view fibre breakage may take place due to the cross-sectional deformation of the fibre caused by the striking force of clothing teeth. Here the dynamic impact of the striking force of metallic clothing of taker-in on cotton fibre was determined proceeding from the consideration that the revolving metallic tooth strikes on a fibre and creates cross-sectional displacement (deformation) of it at the point of striking that spreads along the length of the fibre like the propagation of longitudinal waves along a slender rod. The maximum and minimum striking force of taker-in tooth on fibre were calculated and found to be 0.834 cN and 0.124 cN respectively which are 5-34 times less than breaking strength of single cotton fibre (say 4.2 cN). Therefore it may be concluded that the fibres are not broken immediately on account of its deformation caused by higher rotational speed of taker-in teeth.Download