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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.

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 two 100% polyester fabrics with the same GSM feel and perform differently? The answer may lie in DTY and FDY yarn. Discover how Draw Textured Yarn and Fully Drawn Yarn differ in manufacturing, bulk, softness, stretch, drape, dyeing behaviour and sportswear applications.

Why do two polyester fabrics with the same GSM feel completely different? The answer may lie in yarn denier and filament count. Discover how 75D/36F and 75D/72F polyester yarns differ, what denier per filament means and how filament fineness influences fabric softness, flexibility, drape and performance.