Extrusion & Post
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EVA film blocking
Problem Phenomenon
Layers of the film stick together after winding.
Cause Analysis
EVA melt has strong tack, and the film surface is more prone to blocking; insufficient cooling and high winding tension aggravate the problem.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Strengthen cooling; ②add anti-blocking agent; ③optimize winding tension; ④control the melt temperature.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The blocking tendency of EVA film is stronger than that of PE; anti-blocking agent and cooling are the main means.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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