CONTROLLING DELIVERY OF POLYMER MATERIAL IN A SEQUENTIAL INJECTION MOLDING PROCESS

摘要

Method and apparatus for controlling the delivery of polymer material in a sequential injection molding process. In one embodiment, the method provid es: delivering a first shot of a first material simultaneously to a pluralit y of mold cavities; (14a-14i) independently sensing for each cavity a proper ty that is indicative of a volume or flow of material that is delivered to t he corresponding cavity during the step of delivering the first shot; indepe ndently stopping the step of delivering the first shot to one or more caviti es according to a program that uses as a variable a signal indicative of the property sensed for the corresponding cavity during delivery of the first s hot; and delivering a second shot of a second material simultaneously to the cavities subsequent to the step of stopping the step of delivering the firs t shot.