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