Material Drying
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PET sheet gel particles and impurities
Problem Phenomenon
Gel particles, impurities and transverse lines appear on the sheet, downgrading it to low-end packaging use
Cause Analysis
PET chips themselves do not produce gel particles; degraded raw materials introduced by drying problems, environmental impurities, and added regrind cannot be eliminated during molding, manifesting as gel particles and transverse lines
Solution
① Strictly control regrind quality and environmental hygiene; ② strengthen drying and melt filtration; ③ trace raw material batches when gel particles occur frequently; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The root of gel particles lies in the material, not the machine; raw material purity management plus process filtration is the quality bottom line of transparent PET sheet; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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