Cleaning Action of Cotton Card Equipped with Metallic Card Clothing

Abstract

Fewer nep slivers are obtained from a card equipped with metallic card clothing than from a card equipped with the conventional wire fillet clothing. A combination of metallic card clothing with a larger tooth angle on the cylinder and metallic card clothing with a smaller tooth angle on the doffer reduces neps and impurities in the sliver. These facts are related to the fiber density on the cylinder surface. We considered this relation and the cleaning action in the lickerin part, and made sure that increases in the speeds of all parts of a card equipped with metallic card clothing would increase production and improve sliver quality. Then we designed and built a new card which had various features, including smaller diameters and higher speeds of the lickerin roll, the cylinder, and the doffer, and the use of pneumatic devices and stationary flats. Spinning tests proved that production could be raised fivefold with no lowering of the quality of the sliver or yarn, and that wastes, the floor space and labor could be reduced considerably.