Effect of Hooks in Lap on Fractionation in Cotton Combing
1969
Owalekar, R. G.
Direct measurement of fractionation was carried out to determine the effects of trailing and leading hooks on the combing mechanism. It was found that, even though a preponderance of trailing hooks in the lap generally gave a higher percent noil, such an increase was not necessarily due to excessive long-fiber loss. This increase was due partly to better short-fiber removal and partially to higher long-fiber loss. It was found that 2 Drawing-Super Lap machine preparation generally gave better fractionation, compared to that given by 1 Drawing-Super Lap machine preparation, and the extent of improvement obtained from the use of an extra passage of drawing depended upon the percent noil extracted. These results indicate that the direction of feed in combing is important in total noil loss only and that the fractionation obtained in combing is not much affected by the direction of feed, but is ultimately determined by the total hook content in the lap. This work has also thrown some light on the mechanism of fiber removal in combing, and a hypothesis has been developed which explains the results. In the light of the resulting information, suitable modifications in the design of the comber could be envisaged which will give better fractionation for wide ranges of cottons and noil levels.
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