Material Drying
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Delamination of PET barrier bottles
Problem Phenomenon
Interlayer peeling occurs in multi-layer co-injected PET barrier bottles (containing EVOH, etc.), and barrier performance is lost.
Cause Analysis
Poor interlayer adhesion; material temperature windows do not match; insufficient drying of the middle layer produces gas; shear differences cause interface instability.
Solution
Use compatibilizers or adhesive layers; optimize the processing temperature of each layer to match viscosities; ensure each layer is fully dried.
Key Takeaway
The interlayer bonding force of PET multi-layer bottles is the foundation of barrier performance.
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