Molding Process
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PET Bottle Thin Shoulder
Problem Phenomenon
Shoulder wall thickness too thin, shoulder cracks on drop.
Cause Analysis
The lamp zone temperature corresponding to the shoulder is high or the pre-blow distributes the material to the bottle body too early; the preform shoulder wall thickness design is insufficient.
Solution
①Lower the upper lamp zone or strengthen ventilation there; ②optimize pre-blow timing; ③evaluate the preform shoulder design.
Key Takeaway
Thin shoulder = upper heat + pre-blow rhythm.
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