Molding Process
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PET Bottle Neck Crystallization (White Neck)
Problem Phenomenon
White ring band below the bottle neck.
Cause Analysis
The neck area is heated (lamp too close to the neck or insufficient protection) causing crystallization; affecting sealing and strength.
Solution
①Check neck shading/cooling protection; ②adjust the distance and power of the top lamp zone; ③check preform neck cooling.
Key Takeaway
White neck = heat protection failure.
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