Extrusion & Post
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EMA Film Blocking, Difficult Layer Separation
Problem Phenomenon
EMA film layers block with separation force >5N/15mm, automatic slitting machine cannot separate the layers
Cause Analysis
EMA surface adhesion strong; film temperature too high >40°C during winding; low-molecular substances migrate to the surface forming an 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 full cooling are effective countermeasures
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