Extrusion & Post
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EAA film blocking, difficult to separate layers
Problem Phenomenon
The interlayer blocking force of EAA film is >5N/15mm, and the automatic slitting machine cannot separate the layers
Cause Analysis
EAA surface adhesion is strong; film temperature too high during winding >40°C; low-molecular substances migrate to the surface to form 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 the 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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