초록 ▼

A method of simultaneously effecting the initiation, flow and termination of flow of corresponding melt streams of polymer materials from a plurality co-injection nozzles of a multi-co-injection nozzle injection molding machine to form a plurality of multi-layer injection molded plastic articles. A

A method of simultaneously effecting the initiation, flow and termination of flow of corresponding melt streams of polymer materials from a plurality co-injection nozzles of a multi-co-injection nozzle injection molding machine to form a plurality of multi-layer injection molded plastic articles. A melt stream of polymeric material for each layer is provided and feed along an equal flow path to each nozzle using a common pressure source for each stream of a given polymeric material which is to form a layer in more than one article. A valve means effects the initiation, flow and termination of the flow of material simultaneously and identically in each nozzle.

대표청구항 ▼

A method of substantially simultaneously effecting the initiation. flow and termination of flow of corresponding melt streams of polymeric materials from a plurality of substantially identical, co-injection nozzles of a multi-co-injection nozzle injection molding machine to form a plurality of multi

A method of substantially simultaneously effecting the initiation. flow and termination of flow of corresponding melt streams of polymeric materials from a plurality of substantially identical, co-injection nozzles of a multi-co-injection nozzle injection molding machine to form a plurality of multi-layer injection molded plastic articles, which comprises providing a melt stream of polymeric material for each corresponding layer of each of the articles to be formed, feeding each melt stream of polymeric material which is to form a corresponding layer of each article, separately along a substantially equal flow path to each co-injection nozzle, employing a common pressure source for each melt stream of a given polymeric material which is to form the corresponding layer in each of more than one article, for pressurizing the melt streams of given material substantially simultaneously in each co-injection nozzle and thereby providing substantially the same flow of the given material to and from each of more than one co-injection nozzle, positively effecting the initiation, flow and termination of flow of the given material substantially simultaneously and substantially identically in each co-injection nozzle by employing substantially identical individual value means in each co-injection nozzle, and driving the valve means substantially at the same time and in the same manner in each co-injection nozzle.