Injection Molding
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PET Injection Preform Gate Crystallization (Whitening)
Problem Phenomenon
Whitening around the preform gate, and the bottom easily cracks during blowing.
Cause Analysis
Gate zone shear heat + uneven cooling cause local crystallization; crystallized preforms cannot be oriented during blowing, and the bottom strength is poor.
Solution
①Optimize gate temperature and cooling; ②reduce gate zone shear; ③check hot runner gate temperature control; ④reject whitened preforms.
Key Takeaway
Gate whitening = local crystallization, a hidden danger at the bottom.
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