Extrusion & Post
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Film breakage in PET biaxially stretched film
Fenómeno del problema
PET film breaks frequently during transverse stretching (TDO), causing severe material waste.
Análisis de la causa
Improper stretching temperature (too low or too high); draw ratio too large exceeding the film's bearing limit; cast sheet thickness is uneven.
Solución
Optimize stretching temperature (longitudinal 90-110°C, transverse 100-120°C); reduce the draw ratio; improve cast sheet thickness uniformity.
Conclusión clave
PET film breakage is the combined result of the stretching process and raw material quality.
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