Extrusion & Post
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EVOH film blocking and delamination difficulty
Fenómeno del problema
EVOH film interlayer blocking with delamination force >5N/15mm, automatic slitting machine cannot delaminate
Análisis de la causa
EVOH surface adhesion strong; film temperature too high >40°C during winding; low molecular substances migrate to the surface forming an adhesive layer
Solución
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
Conclusión clave
Film blocking is caused by surface tackiness and high-temperature winding; antiblocking agent and sufficient cooling are effective countermeasures
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