An injection nozzle assembly is used for molding a plurality of articles having accurate dimensions without causing a sink mark to appear in the molded article. The injection nozzle assembly comprises a body which is heated to a temperature higher than the melting point of thermoplastic material. A cylindrical...http://www.google.com.au/patents/US4685881?utm_source=gb-gplus-sharePatent US4685881 - Nozzle assembly for injection molding
