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Polyester fabric can develop dye streaks and barre marks due to yarn variation, knitting tension, dye affinity and processing differences. Learn how to identify these defects and reduce them before garment production.

Why do dark specks and coloured spots appear on polyester fabric after dyeing? Learn how disperse dye agglomeration, unstable dye dispersions, water quality, filtration and machine contamination contribute to dyeing defects. Discover practical inspection and prevention methods for textile mills and bulk fabric buyers.

Why can a polyester fabric pass colour-fastness testing after dyeing but fail after heat setting? Thermomigration may be responsible. Discover how disperse dye molecules redistribute during thermal finishing, why certain softeners increase the risk, and how textile mills can reduce rubbing and washing-fastness problems.

Why does white powder sometimes appear on black polyester fabric after dyeing? One possible cause is oligomer migration, a lesser-known textile processing issue involving low-molecular-weight polyester compounds. Learn how oligomer deposits form, why they accumulate on fabrics and dyeing machines, and how manufacturers can reduce contamination.