13—The Effect of the Density of Card Clothing on the Carding Process

Abstract

This paper concerns an investigation into the amount of carding performed by cylinders and their associated rollers clothed with wires ranging from diamond point (40/4/24) to 140/14/35. The materials used for the investigation consisted of (i) 70s lambs’ wool, (ii) 50s carpet wool, (iii) pulled velour shoddy and (iv) 3-den. 2½-in. Fibro.Carding was assessed in terms of fibre breakage, nep formation, thread content and appearance of web. From these experiments, it would seem that there is no connection between the density of the card clothing used in carding and the degree of fibre breakage, the latter being more closely allied to the length of the original fibres. Long fibres break down in carding to about the same degree regardless of the card clothing used, whereas shorter fibres do not suffer any great degree of breakage no matter on what wire they are carded.Nep formation and removal of thread were found to improve when 100/10/30 and finer densities were used. Wire coarser than 80/8 had a detrimental ...