Molding Process
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Poor liner adhesion of PET bottle caps
Problem Phenomenon
The liner inside the aluminum or plastic cap of PET bottles seals poorly with the bottle mouth, causing leakage.
Cause Analysis
The bottle mouth sealing surface is uneven or has flash; liner material has poor adhesion to PET; capping torque is insufficient or excessive.
Solution
Improve bottle mouth sealing surface flatness; select liner materials with good compatibility with PET (EVA, etc.); control capping torque.
Key Takeaway
PET bottle sealing involves dual factors of bottle mouth precision and liner matching.
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