Material Drying
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PET Preform Missing Moisture Verification
Problem Phenomenon
The process has not changed but hazy bottles appear intermittently.
Cause Analysis
Dryer dew point drift, molecular sieve failure or dehumidification system failure; environmental humidity changes make the drying capacity insufficient.
Solution
①Dew point online monitoring and alarm; ②regular regeneration/replacement of molecular sieves; ③clean the drying filter and air duct; ④strengthen verification in high-humidity seasons.
Key Takeaway
Intermittent haze = drying system state drift.
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