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