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Why do shiny lines and dragged yarn marks appear along polyester seams? Learn how needle surface damage, friction, machine speed, needle size, stitch density and yarn displacement create needle drag—and how garment factories can prevent it.

Why do polyester garment seams develop waves or wrinkles after sewing or washing? Learn how thread tension, feed imbalance, stitch density, fabric stretch, Lycra recovery and differential shrinkage cause seam puckering—and how garment factories can prevent it.