The Effect of Knitting and Wearing Conditions on the Tensile Characteristics of Blended Yarns

Abstract

In this paper, the effect of knitting, washing procedures and tumbling in Pilling box tester on the changes in tensile characteristics of blended yarns is analyzed and discussed. The tested yarns obtained after deknitting fabrics differed in their compactness. The rib knitted samples were produced on a flat V-bed knitting machine in a gauge of 10E from two yarn compositions, i.e. 50 % merino wool / 50 % acrylic and 50 % cotton / 50 % acrylic. After knitting the samples were domestic washed and dried. Then they were tumbled in Pilling box tester. A study of the tensile characteristics (breaking force, elongation of break, work at maximum force at break, initial elasticity modulus) of initial and deknitted yarns is presented. The stress-strain curves of initial and deknitted yarns from fabrics of various densities are discussed. The changes in tensile indices of yarns deknitted from unwashed, washed (1, 3 and 5 cycles) and tumbled samples are compared.