Causes
- Heat transfer through hot products or media
- High process temperatures required
- Heat radiation from other plant components
- Furnace outlet or IR emitter
Effects
- Standard PUR coating melts and contaminates product
- Hardening and cracking of the cover material (rubber)
- Flattening and slippage of the cover
- Marks due to cracks and chipping of the coating
In many places, rolls coated with elastomers are subjected to high temperatures. This means temperatures between 80°C and 250°C, depending on the elastomer.
If PU coatings become too hot, they melt, rubber smooths out and cracks. The superficially melted coating material sticks to the product, is carried away and can hardly be removed.
