Spinning Cotton Combed Yarns from Slivers Processed on a High-Production Card

Cotton slivers delivered from a high-production card, Toyoda CK-7C, at production rates of 35, 50, 70 and 100lbs/hr were processed on three kinds of pre-comber processes with diffeent combinations of draftings, and then spun into 12, 18, 30 and 40s combed yarns. The yarns were compared with those processed on a conventional card at a production rate of 10lbs/hr. The carding waste was much smaller in amount on the high-production card than on the conventional card. The slivers from the high-production card contained fewer trailing or majority hooks and more leading or minority hooks than the slivers from the conventional card. It was supposed that this tendency would increase the comber noil, but the noil did not increase if slivers were processed by a pre-comber process with a higher drafting ratio in such a direction that minority hooks would be reduced in number. A saving of cotton is possible by processing on the high-production card for combed yarn in a similar way to the processing of carded yarn. Increasing the production rate of the card up to 1001bs/hr did not at all affect the quality of coarse combed yarn up to 20s. Nor did it affect the tensile strength or the irregularity of 30 or 40s combed yarn, but it affected slightly the imperfection counts of the yarn. However, no difference at all was found in quality between combed yarns of 30s or 40s processed on the high-production card at 50lbs/hr and the yarns of the same count processed on the conventional card at 10lbs/hr.