In many places, rolls coated with PU or rubber are exposed to high temperatures. Depending on the elastomer, this means temperatures of between 80 °C and 250 °C.
This can take place due to heat transfer of the product. There are also processes that can only be carried out at high temperatures, such as encapsulating or drying processes after coating. In addition, heat radiation from other system components can destroy coatings in the long term. Heat radiated from a furnace outlet or an IR heater can have an effect on a coating far from the heat source.
If PU coatings become too hot, they melt. The coating material melted on the surface sticks to the product, is torn away by the product and is very difficult to remove from the product surface.
If conventional rubber coatings become hot, they harden, cracks form on the surface and they become glazed. In the case of sensitive products, cracks and break-outs lead to impressions, glazed surfaces allow the product to slide on S-deflection and drive rolls.
Problems in brief:
- Temperature loading of the covering material due to high product temperatures
- Extreme process temperatures
- Thermal radiation subjects the rubber coating to stress
Ultradur: Non-slip coating for unoiled products at temperatures up to 160 °C.
66.90HT: Oil-resistant, cut-resistant coating for use up to 150 °C
92.95: Polyurethane coating temperature resistant up to 140 °C
509.95: Oil-resistant coating for up to 160 °C with excellent mechanical properties
510.92: Oil-resistant coating for up to 160 °C with extreme mechanical properties
Silikon: Material group that can be used at extreme temperatures of up to 250 °C.