EFFECT OF INCREASE IN THE PRODUCED SLIVER WEIGHT ON THE CLEANING ACTION IN HIGH SPEED CARDING

Abstract

(A) The speed of the cylinder was varied into 3 to 5 steps in a range from 170rpm to 340rpm in a conventional card in which the speed of every part is proportional to that of the cylinder. For each of these steps 50, 100 and 150 grain/yd-slivers were produced. Then, produced slivers, flat strips and taker-in wastes were analyzed by the Shirley Analyzer and the results obtained were as follows:(1) At each grain/yd of the sliver, the percentage of the lint content in the sliver to the amount of lap fed decreases slightly, while those in the flat strip and the taker-in waste increase with the increase in the speed. These rates of change, however, become smaller with the increase in grain/yd of the produced sliver.(2) At each grain/yd of the sliver, the percentage of the visible waste content in the sliver to the amount of lap fed is decreased, whereas that in the taker-in waste is conversely increased with the increase in the carding speed. This indicates a great improvement in the quality of the sliver. However, these effects become smaller with the increase in grain/yd of the produced sliver.(3) At each grain/yd of the sliver produced, the percentage of the invisible waste content in the sliver to the amount of lap fed decreases with the increase in the speed, but the effect becomes smaller with the increase in grain/yd of the produced sliver.(B) The speed of cylinder was fixed at 170rpm, 250rpm and 340rpm and the amount of lap fed was increased at the constant speed of other parts of the card. Then, the produced slivers, flat strips and taker-in wastes were analyzed as in (A) and results obtained were as follows.(1) At each speed of the cylinder, the percentage of the lint content in the sliver to the amount of lap fed increases, while those in the flat strip and taker-in waste decrease with the increase of the grain/yd of the produced sliver. These rates of increase and decrerse are constant independently of the speed of cylinder.(2) At each speed of the cylinder, the percentage of the visible waste content in the sliver to the amount of lap fed increases strikingly, whereas that in the flat strip decreases strikingly with the increase of the grain/yd of the produced sliver. And that in the taker-in waste decreases with the increase in the grain of the produced sliver, but the decrease becoms smaller with the increase in the speed of each part of the card.(3) At each speed of the cylinder, the percentage of the invisible waste content in the sliver to the amount of lap fed increases slightly and that in the taker-in waste decreases with the increase of the grain/yd of the produced sliver.