Process of extrusion casting a transparent thermoplastic aliphatic polyurethane film

摘要

A process for producing a flat transparent film made of thermoplastic polyurethane, comprises feeding a molten thermoplastic polyurethane with a temperature of 150-220 degrees C between two films made of a thermoplastic with a higher melting point, at 0-80 degrees C. The product is then passed between two rollers at 10-70 degrees C, after which it is cooled and cut, and the higher melting point plastic is then removed. The thermoplastic polyurethane is an aliphatic polyurethane, and is 0.1-5, especially 0.3-3mm thick. The higher melting point plastic is a polycarbonate, and is 0.1-5mm especially 0.5-2mm thick. Once the higher melting point plastic is removed it can be reused.