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A sewability index brings together needle penetration, stitch quality and fabric damage to help predict how smoothly polyester will perform in garment production.

A momentary yarn-feed interruption can change loop formation in circular-knitted polyester and create a visible row defect, hole or repeated stitch disturbance. The precise appearance depends on machine construction and where the interruption occurs.

Bands in polyester sublimation artwork can originate at the inkjet print stage or during transfer. Missing nozzles can leave repeated white or weak-colour lines, while inaccurate media-feed steps create another pattern. Changing an ICC profile will not clear a blocked nozzle.

Heat-bonded emblems and patches simplify garment decoration, but a visually attached patch may still peel after washing or stretching. Adhesive type, surface finish, pressing pressure and cooling method all affect the lasting bond.

Ultrasonic seams join compatible thermoplastic layers by locally softening and pressing the material; sewn seams interlock thread through needle perforations. Neither method is automatically stronger, stretchier or waterproof. Selection depends on the garment and required failure mode.

Woven polyester edges can unravel when the cut releases yarn ends from a low-friction or relatively open construction. Fabric strength in a tensile test does not describe how quickly those ends escape during handling and sewing.

Two polyester-elastane knits can stretch to the same percentage but feel very different on a body because the required force is not the same. Stretch percentage describes deformation, while load-extension behaviour describes resistance to stretching. Recovery and permanent set determine how well a garment returns to shape.

Polyester often accumulates electrostatic charge when rubbed against other materials, especially in low-humidity conditions. The result may be static cling, audible crackling or attraction of dust and lint. Antistatic performance depends on fibre surface chemistry, garment combination, environment and the durability of any finish.

Ozone in air can react with some textile colour systems, producing colour change even without washing. Ozone fastness is not identical to sunlight fastness. ISO 105-G03:1993, reconfirmed in 2025, describes evaluation of textile colour resistance to atmospheric ozone under specified humidity and temperature conditions.