Determination of key characteristics of seam strength of double thread chain stitch in a superimposed woven fabric seam assembly

This study addresses the challenge of seam failure in men’s casual wear trousers made from woven fabrics, a significant quality issue stemming from reliance on trial and error due to limited knowledge on enhancing seam strength. Focusing on superimposed seams joined by a 401-double thread chain stitch, the research utilizes a 2^k factorial experimental design to examine the effects of variables: sewing thread tension (A), sewing thread strength (B), fabric stability (C), stitch density (D), and fabric tensile strength (E) on seam strength. Through this design, which included a single replication for cost and time efficiency, the study analysed 32 treatment combinations to identify significant factors and their optimum levels for maximizing seam strength. Normal probability plots pinpointed significant main effects (C, D, E) and a marginal two-way interaction (CD), revealing A and B as insignificant. Optimal seam strength was achieved by controlling C, D, and E at lower levels. The study’s major contribution lies in delineating the significant factors influencing seam strength, thereby offering a statistical foundation to replace the trial and error method in product design and development. This research underlines the importance of managing key variables to optimize seam strength, and enhance the quality of trousers.