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Why does dark polyester fabric develop pale or greyish patches after rubbing? Learn how abrasion, filament damage, surface roughening and light scattering cause frosting. Discover how to distinguish frosting from dye fading and pilling, evaluate abrasion resistance and select durable polyester knitted fabrics.

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.

Can a polyester sportswear fabric feel soft but perform poorly at managing sweat? Certain silicone softeners can reduce fabric wettability and interfere with moisture transport. Discover the difference between hydrophobic and hydrophilic silicone finishes, how they affect dry-fit performance and what manufacturers should test before bulk production.

Why do polyester-Lycra fabrics with the same GSM behave differently after washing or stretching? Heat setting may be the reason. Discover how temperature, fabric tension and stenter overfeed influence shrinkage, width, GSM and elastic recovery—and why incorrect finishing conditions can create costly garment-quality problems.

Why do polyester-Lycra leggings become loose around the knees even when they do not shrink? The answer may be fabric growth, a lesser-known textile property linked to incomplete elastic recovery. Learn how fabric growth occurs, how it is measured and what manufacturers can do to improve stretch-fabric shape retention.

Why do white or shiny elastic threads appear when polyester-Lycra fabric is stretched? This lesser-known problem, called elastane grin-through, can affect leggings, sportswear and fitted garments. Discover its causes, how it differs from transparency and how manufacturers can improve fabric coverage before bulk production.

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.