An injection molding one-piece gate and cavity insert to be mounted between a heated nozzle and a cavity. The insert has cooling fluid passages extending through it around the gate and cavity. The passages alternately extend both forwardly and rearwardly and inwardly and outwardly to improve cooling...http://www.google.fr/patents/US6017209?utm_source=gb-gplus-shareBrevet US6017209 - Injection molding cooled gate insert
