Processing Machinery
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PET sheet black specks and impurities
Problem Phenomenon
Black specks appear in the sheet; the whole roll is scrapped and food packaging customers reject it
Cause Analysis
Carbonized material shedding inside the barrel or die forms black specks; accumulated old material is periodically released after thermal decomposition; foreign particles brought in by recycled material are also a source of black specks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Regularly clean equipment to prevent carbon buildup; ② optimize processing temperature to prevent decomposition; ③ install fine-mesh filters and strengthen raw material inspection; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PET sheet black specks are a zero-tolerance defect; only the trinity of equipment cleaning, temperature management, and filtration interception can eradicate them; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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