Molds & Tooling
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PET preform mold temperature
Problem Phenomenon
The preforms show stress whitening after demolding and are prone to bursting in subsequent bottle blowing
Cause Analysis
When the mold temperature is too low, the preform body is quenched, producing high internal stress, and the stress concentration areas rupture during bottle blowing; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Control the preform mold cooling water temperature at 10-15℃ and ensure the flow rate; overcooling instead aggravates stress; regularly check the water channels; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Preform mold temperature must guard against overcooling stress, and water channel maintenance is the foundation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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