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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.

Polyester garments can develop shiny patches at elbows, seats and other friction zones. This guide explains fibre flattening, heat, pressure and construction factors behind the effect.

How to evaluate hand feel consistency in polyester fabrics, compare samples and set practical production specifications.

How to evaluate fabric lot traceability in polyester fabrics, compare samples and set practical production specifications.

How to evaluate print ghosting in polyester fabrics, compare samples and set practical production specifications.