Material Drying
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PET mold temperature too low causing condensation
Problem Phenomenon
Water-stain-like foggy spots appear on the bottle surface, which disappear briefly after wiping and then reappear; the problem worsens in seasons with high environmental humidity.
Cause Analysis
When the mold temperature is below the ambient dew point, water vapor in the air condenses on the cavity surface; the condensed water prevents the bottle surface from fitting and replicating the mold, forming foggy spots and surface defects.
Solution
①Increase the mold temperature above the dew point; ②control the workshop humidity; ③keep the mold surface clean and polished; ④check the rationality of the chilled water temperature setting.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Condensation foggy spots are a typical manifestation of imbalance between mold temperature and environmental humidity; mold temperature is not the lower the better—it must be above the dew point to ensure surface replication quality.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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