COMPARATIVE STUDY OF PICKER AND DRAW-FRAME BLENDS OF COTTON AND NYLON
ARMY NATICK LABS MA CLOTHING AND ORGANIC MATERIALS LAB
Pagination or Media Count:
Blended yarns were produced from a good grade of cotton 1 12 inch American-Egyptian and nylon 420 1 12-inch - 2.3 denier with percentages of nylon of 0, 25, 50, 75, and 100. Blending was done at the picker and at the drawframe for each blend composition. All yarns were spun to a nominal 28s count cotton system with a twist-multiplier of 3.0. Cross-sections of these yarns were examined microscopically to determine the longitudinal, radial, and rotational distributions of the fibers. It was observed that the yarns produced by picker blending were more uniform in composition than those produced by draw- frame blending. However, the draw-frame blends conformed more closely to the planned nominal composition of the yarns. The radial distribution analyses indicated that for both the picker and draw-frame blends there was in most instances a deficiency of nylon at the periphery and at the center of the yarns. However, away from the center and periphery the blend composition closely matched the average blend composition of the yarns. The rotational distribution analyses showed that sectors having a high nylon concentration were found to be flanked by sectors of slightly more than average nylon concentration, for the yarns examined.