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