Extrusion & Post
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PVA film blocking, difficult to delaminate
Problembeschreibung
Interlayer blocking of PVA film, delamination force >5N/15mm, automatic slitting machine cannot delaminate
Ursachenanalyse
PVA surface adhesion strong; film temperature too high >40°C during winding; low molecular substances migrate to the surface forming an adhesive layer
Lösung
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 reduce interlayer pressure
Wichtigste Erkenntnis
Film blocking is caused by surface tackiness and high-temperature winding; antiblock agent and full cooling are effective countermeasures
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