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Optical brightening agents (OBAs) absorb part of the ultraviolet region and re-emit visible blue light, making some white polyester materials appear brighter. Their contribution depends on the illuminant's UV content, material chemistry and finish; this can create shade mismatches between fabric, rib, thread and trims under different lights.

Seam slippage occurs when woven warp or weft yarns move under loading near a sewn seam, exposing a gap even if thread and fabric do not break. Loose construction, low yarn-to-yarn friction, seam allowance, stitching and finish can influence the result. Seam strength alone does not describe resistance to yarn displacement.

The colour shown on a monitor is emitted light, but sublimation printing transfers dye into polyester under heat. Ink set, transfer paper, printer settings, fabric dye base, finish and heat-press conditions all affect the final shade. An ICC workflow manages colour conversion for a defined system, not an unspecified combination of equipment and fabrics.

Plaiting stacks an open-width fabric back and forth into folds. Prolonged pressure at repeated fold lines, elevated heat, moisture and a sensitive surface finish can leave creases or differential sheen. A fresh fold is not necessarily a permanent defect; evaluate the fabric after controlled relaxation before reprocessing.

During high-speed over-end unwinding, yarn leaving a cone can form a rotating balloon between the package and the first guide. The balloon changes its shape as winding diameter, yarn speed and guide position change. Resulting tension peaks may affect knitting, warping or texturing performance even when average yarn strength is acceptable.

In plated circular knitting, two yarns are presented to the same needle in controlled relative positions to create different fabric faces or functional layers. A plating fault occurs when intended yarn placement becomes inconsistent, causing visible colour or texture spots on the wrong side.

Polyester sports mesh and lightweight jerseys can distort under embroidery because needle penetrations, thread tension and dense fill stitches concentrate forces in a flexible structure. An effective stabilizer and well-digitised stitch path are often more important than simply increasing embroidery density.

A polyester T-shirt neckline may look correctly shaped at dispatch but widen, wave or become loose after repeated wear and washing. The rib fabric, neck opening geometry, binding length, seam tension and recovery behaviour all contribute. Initial stretch percentage is not the same as lasting recovery.

Running and gym garments can feel comfortable when tried on briefly yet cause abrasion or irritation during repetitive movement. Seam contact pressure, stitch profile, moisture, garment fit and local placement all matter; merely labeling a seam 'flatlock' does not guarantee a chafe-free experience.