A method for continuously producing expanded thermoformable materials comprising the steps of: conveying a thermoformable assembly by means of a conveyor through a plurality of heating zones, whereby the thermoformable assembly is heated to a temperature at which the thermoformable material adhesively...http://www.google.de/patents/US6322651?utm_source=gb-gplus-sharePatent US6322651 - Method for continuously producing expanded thermoformable materials
