Extrusion & Post
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PU Film Blocking, Difficult Delayering
Fenómeno do problema
PU film interlayer blocking, delayering force >5N/15mm, automatic slitting machine cannot separate layers
Análise das causas
PU surface adhesion strong; film temperature too high >40°C during winding; low molecular substances migrate to the surface forming an adhesive layer
Solução
1) Add 0.3-0.5wt% antiblock 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 decrease interlayer pressure
Conclusão principal
Film blocking is caused by surface tack and high-temperature winding; antiblock agent and full cooling are effective countermeasures
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