Extrusion & Post
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EVA film blocking with difficult separation
Problem Phenomenon
EVA film interlayer blocking force >5N/15mm; automatic slitting machine cannot separate layers
Cause Analysis
EVA surface adhesion strong; film temperature too high >40°C during winding; low molecular substances migrate to surface forming adhesive layer
Solution
1) Add 0.3-0.5wt% antiblocking agent erucamide; 2) Fully cool to <25°C before winding; 3) Add 0.2wt% slip agent to synergistically reduce blocking; 4) Reduce winding tension to reduce interlayer pressure
Key Takeaway
Film blocking is caused by surface tackiness and high temperature winding; antiblocking agent and sufficient cooling are effective countermeasures
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