Apparatus and a process for manufacturing thin walled hollow parts such as automobile crash pads from dry thermoplastic powder includes a louver type valve system in the open end of a powder charge box and means for joining the charge box end-to-end with an open-ended heated mold for rotation so that...http://www.google.es/patents/US4664864?utm_source=gb-gplus-sharePatente US4664864 - Mold loading method and apparatus
