Study on the Changes in Tensile Properties of Sewing Thread after Sewing & Washing Process

Abstract

Tensile properties of the thread play a major role in quality, appearance, and aesthetics of the seam. However, those properties are reduced considerably after sewing in high speed machines due to repeated loads and deformations (stretch, bending, compression, shearing, friction, abrasion, high temperature…) and after industrial washing process (when emerging in hot, detergent water under torsion bending, compression, friction, abrasion during long period of time). This article studied the changes in tensile properties of 5 threads sewn in Denim fabrics used for export order of Duc Giang Garment Co. Ltd. Results show that low extension of threads after sewing and washing (from 1,23% to 4,5%) does not influence the quality of the seam. However, the breaking elongation and tensile strength of sewing threads 3, 4 after sewing and industrial washing is reduced considerably by 14.56% and 64,5% due to Denim drying process at 105oC during 90 min. Such high reduction in breaking elongation & tensile strength may reduce strength and quality of the seam.