ANALYSIS OF THE EFUsmanova Feruzakhon Bakhadirzhanovna FECT OF MACHINE NEEDLES ON KNITTED FABRICS DURING THE SEWING PROCESS OF BLENDED KNITWEAR

Blended knitted fabrics are characterized by high elasticity and significant deformation properties, and during the sewing process, machine needles have a considerable impact on the fabric structure. Incorrect needle selection or improper sewing parameters may lead to fiber breakage, loop structure damage, reduced seam quality, and the formation of surface defects. Therefore, the scientific study of needle–fabric interaction is highly relevant. In this study, different types of needles (ball point, universal, and stretch) used in sewing blended knitted fabrics were experimentally analyzed. The effects of needle diameter, tip shape, and sewing speed on fabric structure and seam quality were evaluated. Microscopic observations were conducted to determine the level of fiber damage, and quality indicators were compared using statistical analysis. The results showed that ball point needles pass between the loops of knitted fabrics, causing minimal fiber damage and improving seam quality. In contrast, sharp-pointed universal needles tend to cut fibers, increasing the number of defects. It was also found that increasing the needle diameter intensifies fabric deformation. When optimal sewing parameters are selected, defects can be reduced by 20–30%. Thus, proper selection of needle type and technological parameters in sewing blended knitted fabrics is a key factor in improving product quality. Scientifically justified needle selection helps preserve fabric structure, ensure seam strength, and enhance production efficiency