Extrusion & Post
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Poor transparency and haze in PET film
Problem Phenomenon
PET biaxially stretched film has poor transparency and a high haze value.
Cause Analysis
The content of additives (slip agents, antiblocking agents) in the raw material is too high or particle size is too large; improper stretching temperature causes incomplete crystallization.
Solution
Select low-haze grade PET raw material; optimize stretching temperature (longitudinal 90-110°C, transverse 100-120°C); control cooling rate.
Key Takeaway
PET film transparency is influenced by both raw material formulation and the stretching process.
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