A surge of high pressure is momentarily applied to a plasticized molding material injected in a mold cavity immediately after the completion of an injection process so that molding shrinkage and orientation which are caused in the material in the mold cavity in the course of solidification of the material...http://www.google.es/patents/US5059370?utm_source=gb-gplus-sharePatente US5059370 - Injection molding method using surge pressure
