Extrusion & Post
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CMC Film Blocking and Difficult Layer Separation
Problem Phenomenon
Interlayer blocking of CMC film with separation force >5N/15mm; automatic slitting machine cannot separate the layers
Cause Analysis
CMC surface adhesion is strong; film temperature is too high >40°C during winding; 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 winding tension to reduce interlayer pressure
Key Takeaway
Film blocking is caused by surface tack and high-temperature winding; antiblocking agent and full cooling are effective countermeasures
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