초록 ▼

A multi-coinjection nozzle injection molding machine and nozzle for co-injecting at least three streams of melt materials to form a multi-layer article. The nozzle includes at least two interfitting shells and a nozzle cap. At least one of the shells has a feed flow channel for flow of melt material

A multi-coinjection nozzle injection molding machine and nozzle for co-injecting at least three streams of melt materials to form a multi-layer article. The nozzle includes at least two interfitting shells and a nozzle cap. At least one of the shells has a feed flow channel for flow of melt material which leads to an associated annular flow passageway. The shells have a symmetrical furstoconical shape and and form a fixed tapered, symmetrical, frustoconical portion of an annular passageway which terminates at a fixed, annular orifice for the flow of melt material therethrough.

대표청구항 ▼

An injection nozzle assembly having a central channel with an open end, for co-injecting at least three streams of melt materials to form a multi-layer article from said melt material streams, said nozzle comprising at least two interfitting shells each having inner and outer surfaces, and a nozzle

An injection nozzle assembly having a central channel with an open end, for co-injecting at least three streams of melt materials to form a multi-layer article from said melt material streams, said nozzle comprising at least two interfitting shells each having inner and outer surfaces, and a nozzle cap having an inner surface enclosing at least a portion of the outer surface of the outermost one of said interfitting shells, at least one shell containing a feed flow control channel for flow of melt material therethrough, said feed flow channel leading to an associated annular flow passageway, said annular flow passageway being bounded on one side by a portion of the outer surface of the shell containing said flow channel and being bounded on the other side by a portion of the inner surface of an adjacent one of the interfitting shells or of the nozzle cap, a portion of the outer surface of the shell containing said flow channel having a symmetrical, frustoconical shape, a portion of the inner surface of said adjacent shell or nozzle cap having a symmetrical, frustoconical shape, said outer and inner symmetrical, frustoconical surface portions being adapted and cooperating to form a fixed tapered, symmetrical frustoconical portion of said annular passageway which terminates at a fixed, annular orifice whose dimension is substantially invariable for flow of melt material therethrough, into the central channel of the nozzle assembly.