On the Experimental Condition of a Wear Resistance Test for Spun Yarns

Abstract

Effects of the geometrical configuration and dimension of an abrasion tester on the frictional fatigue behavior of spun yarns were investigated experimentally. Spun yarns of 63 tex were made of polyester staples of 51 mm length and 2 denier, and were examined by the abrasion tester which was developed by the authors. The wear and breakage of yarns result from the cutting and /or pull out of fibers. (1) In the region where the diameter D of the frictional pin is smaller than 2.5 mm, the yarn breakage depends on the fiber cutting. With the increase of D the frictional energy Eb consumed up to the yarn breakage increases, because it becomes harder for the pin to cut the fiber. (2) In the region of D≥2.5 mm, the yarn breakage is dominated by the pull out of fibers. The wear and tear of yarns is partially suppressed by the transmission of twist from the thicker part to the abraded thinner part. Therefore, the large tention W applied to the yarn results in a large abrasion resistance Eb. (3) When the stroke S of the frictional pin is too small (S = 12 mm), the yarn breakage depends on the fiber cutting. which brings about remarkably large Eb for the pin with D = 2.5 mm.