Thermoplastic granules mixed with a blowing agent are processed in a barrel unit which encloses a rotating screw which mixes, works and plasticizes the mixture so that at the leading end of the barrel it is in a molten condition suitable for extrusion or injection molding. The screw has two compression...http://www.google.es/patents/US4185060?utm_source=gb-gplus-sharePatente US4185060 - Method of manufacturing structural foam plastic products free from undesirable contaminant constituents
Method of manufacturing structural foam plastic products free from ...
