How the Quality of Yarn Processed by a High-Production Cards is Affected by its Cylinder, Taker-in and Doffer Speeds, Sliver Weight and Production Rate

The effects of the cylinder speed (250-600rpm), taker-in speed (600-1500rpm), doffer speed (15-33rpm), sliver weight (4-8g/m) and production rate (16-34kg/h) have been investigated on a high-production card with the following results : 1) The optimum speeds of the cylinder and the taker-in are 400rpm and 1000rpm respectively from the view-point of yarn quality. 2) Increasing the sliver weight up to 6g/m do not damage yarn quality. 3) Increasing the production rate together with the doffer speed do not damage yarn quality. 4) Keeping the sliver weight at 6g/m and adopting a high speed web doffing unit, the increase of the production rate up to 57kg/h does not degradate yarn.