Causes
- Coating too adhesive
- No long-lasting anti-adhesiveness
- Successive build-up of adhesive residues on the cover surface
- Stickiness due to heat not dissipated
Effects
- Extruded film adheres to the take-off roll
- Damaged roll surface due to melting
- Product damage
- Short service life
- Insufficient product quality
The extrusion die is located a few centimeters in front of the pressure joint formed by the nip and take-off roll. Molten material with a temperature of up to 290° C emerges from this wide slot die. In the nip, the extruded mass solidifies until it reaches a plastic stable state. Due to the process, the temperature of the film produced in the roll gap is still very high. Therefore, the still hot film tends to adhere to the coated take-off roll. Optical and haptic properties of the extruded film are decisively determined by the surface structure of the rolls and their take-off behavior.
