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Why do some polyester knitted fabrics develop continuous vertical streaks even when their GSM, colour and width are correct? Needle lines and sinker lines are technical knitting defects often linked to damaged machine components and irregular loop formation. Learn their causes, differences, inspection methods and prevention techniques.

Why do horizontal stripes curve or appear tilted in polyester knitted fabric? Bowing and skewing are technical fabric defects that affect structural alignment, printing accuracy and garment quality. Discover their causes, key differences, testing methods and how manufacturers can reduce these problems before bulk production.

Why do polyester T-shirts develop twisted side seams after washing? The cause may be fabric spirality, a technical distortion linked to yarn torque, circular knitting, stitch length and finishing conditions. Discover how spirality affects garment quality, how it is tested and what manufacturers can do to reduce twisting before bulk production.