Material Drying
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PET bottle body moisture marks
Problem Phenomenon
Moisture marks appear on the preform surface; uneven bottle body gloss after blowing
Cause Analysis
Too low mold cooling water temperature causes condensation on the mold surface; high workshop temperature and humidity aggravate water droplets on the mold; mold water leakage directly contaminates the cavity surface; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Raise the mold circulating water temperature above the dew point; ② workshop air conditioning adjusts temperature and humidity; ③ check and eliminate mold water leakage; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Moisture marks are the product of imbalance between environment and mold temperature; water temperature above the dew point plus workshop dehumidification is the standard countermeasure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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