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Repeated tumble drying exposes polyester fabric to heat and mechanical action that can change dimensions, surface appearance and hand feel even when the fibre itself is durable.

Garment twisting after washing often comes from stored fabric torque, spirality, yarn twist and cutting alignment rather than from ordinary shrinkage alone.

Polyester fabric can shed small fibrous fragments while being washed. The amount captured during a test depends on garment construction, previous wear and wash conditions, as well as the analytical method itself. Understanding these variables helps mills develop fabrics that meet both durability and measured fibre-release expectations.