Wrinkling

Wrinkling is a common quality defect term in foreign trade cargo packaging and transportation. It refers to irregular folds, ripples, or unevenness on the surface of paper, plastic film, metal foil, textiles, or flexible packaging caused by factors such as packaging materials, environmental humidity, stacking pressure, or transportation vibration. This term is widely used in quality inspection, claim negotiations, and contract clauses, especially in the paper, film, aluminum foil, apparel, and flexible packaging industries. Usage scenarios include: the buyer rejecting goods or claiming compensation due to wrinkling upon delivery; letters of credit may specify 'no wrinkling' as a quality indicator; transportation insurance claims require distinguishing whether wrinkling is original or caused during transit. Note: Wrinkling is often confused with 'Crease' and 'Deformation'. A crease is mostly a regular linear mark, while deformation involves an overall shape change. Wrinkling may affect product appearance, sealing performance, or even functionality, but slight wrinkling is sometimes acceptable within industry tolerances. Difference: Wrinkling emphasizes surface unevenness, while 'Shrinking' is mostly caused by material contraction, and 'Indentation' is formed by localized pressure. Foreign trade practitioners should clearly specify acceptance standards, inspection methods, and liability attribution for wrinkling in contracts to avoid disputes.