초록 ▼

Apparatus for making a rigid container by injection molding a parison having plural layers of polymers. The parison is blow molded to the final shape of the container. Control during injection is exercised over each of the plural polymers so as to produce uninterrupted layers extending throughout th

Apparatus for making a rigid container by injection molding a parison having plural layers of polymers. The parison is blow molded to the final shape of the container. Control during injection is exercised over each of the plural polymers so as to produce uninterrupted layers extending throughout the walls of the parison and to insure that the interior layers are completely encapsulated within the outer layers.

대표청구항 ▼

Apparatus for making a multi-layer rigid article, comprising: (A) an injection mold and a core pin which together define a cavity for molding a parison having a bottom portion, the cavity having an entrance at the bottom portion of the parison, (1) an injection nozzle having an exit communicative wi

Apparatus for making a multi-layer rigid article, comprising: (A) an injection mold and a core pin which together define a cavity for molding a parison having a bottom portion, the cavity having an entrance at the bottom portion of the parison, (1) an injection nozzle having an exit communicative with the entrance, a flow path for each of three polymer streams, and exit orifices for the polymer streams communicative with said nozzle exit, (2) means for independently commencing in the nozzle exit the flow of a first polymer stream to become the inside surface layer of the parison and the flow of a second polymer stream to become the outside surface layer of the parison, and the flow of a third polymer stream between the first and second polymer streams to become an inner layer of the parison, (3) means for independently controlling the flow of each of the three polymer streams relative to each other during each injection cycle, (4) means for independently terminating the flow of each of the polymer streams, operable to terminate each or any of said polymer streams independently of one another and at predetermined including differing times during each injection cycle, (5) means associated with the independent commencing means, the independent controlling means and the independent terminating means, for coordinating their respective functions in a predetermined manner during the injection cycle, to permit termination of the flow of the first polymer stream, then termination of the flow of the third polymer stream, and thereafter termination of the flow of the second polymer stream, to thereby enable the apparatus to provide the article with an inner layer formed from the third polymer stream that is continuous and is completely encapsulated within the surface layers, (b) means for transferring the injection molded parison to a blow molding cavity having the configuration of the article, (C) means for inflating the parison in the blow molding cavity to form the article.