Extrusion & Post
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Uneven thickness of EVA film extrusion
Problem Phenomenon
The transverse thickness deviation of EVA film is large.
Cause Analysis
Uneven die lip gap or uneven die temperature distribution; the tack of EVA melt also makes the discharge sensitive to temperature.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Precisely adjust the die lip gap; ②balance the die temperature distribution; ③stabilize the extrusion output; ④online thickness measurement feedback.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The key points of EVA film thickness control are similar to those of PE film; die lip precision and temperature uniformity are the core.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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