Processing Machinery
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EVA film gel particles
Problem Phenomenon
Gel particles appear on the film surface.
Cause Analysis
EVA is heat-sensitive, and retained material degrades to form gel; insufficient filtration lets impurities through.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Strengthen filtration; ②control the processing temperature; ③clean the dead corners of the die head; ④shorten the residence time.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
EVA has high thermal management requirements; temperature and residence time control prevent gel.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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