Molding Process
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PET Bottle Cap Slipping Threads
Problem Phenomenon
Bottle neck thread strength insufficient, cap slips threads.
Cause Analysis
Bottle neck dimensional deviation (preform neck molding problem) or improper neck crystallization; flash in the thread area.
Solution
①Check the neck mold and molding; ②control the neck crystallization process; ③trim flash; ④thread dimension sampling inspection.
Key Takeaway
Slipping threads = neck dimensions and condition.
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