Extrusion & Post
8 views
PU Film Blocking, Difficult Delayering
Problem Phenomenon
PU film interlayer blocking, delayering force >5N/15mm, automatic slitting machine cannot separate layers
Cause Analysis
PU surface adhesion strong; film temperature too high >40°C during winding; low molecular substances migrate to the surface forming an adhesive layer
Solution
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
Key Takeaway
Film blocking is caused by surface tack and high-temperature winding; antiblock agent and full cooling are effective countermeasures
Was this helpful?
0 people found this helpful
Thank you for your feedback!