Processing Machinery
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PET winter water temperature control
Problem Phenomenon
In winter, the preform cooling water temperature is too low, and preform body stress cracks increase
Cause Analysis
In winter the cooling water temperature may be below 5℃, the preform body quench stress increases sharply, and the bottle blowing burst rate rises; 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 cooling water temperature at the lower limit of 10-15℃; add temperature regulation to the cooling tower; include water temperature records in process monitoring; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The cooling water temperature has a lower limit, and overcooling is as harmful as overheating; 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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