Molds & Tooling
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PET Preform Weld Line
Problem Phenomenon
A visible confluence line on the preform body, which is weak after blowing.
Cause Analysis
Multiple gates or structure make the melt fronts converge; low temperature and poor venting.
Solution
①Raise temperature and speed; ②venting; ③hot runner balance.
Key Takeaway
Preform weld line = weak band in blowing.
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