| 摘要 |
The invention relates to a co-injection nozzle (2) for an injection moulding device for producing multi-layered injection-moulded products, said nozzle comprising: a central bore (20); a valve needle (10) for opening and closing a nozzle opening (30), which needle is held in an axially movable manner in the central bore (20); an annular inner melt channel (23) for the first melt (A); an annular central melt channel (24) for a second melt (B); and an annular outer melt channel (25) for the first melt (A), the inner, central and outer melt channels (23, 24, 25) being fluidically combined in the region of the nozzle tip (9) in order to form a concentrically-layered melt stream. According to the invention, the co-injection nozzle (2) further comprises a nozzle body (11) and a melt runner insert (12) having the central bore (20) of the co-injection nozzle (2). The melt runner insert (12) has a circular cylindrical section (51), by which the insert is held in a central bore (52) of the nozzle body (11). At least one distribution channel (26) for the first melt (A) and at least one distribution channel (27) for the second melt (B) are formed in the outer surface of the circular cylindrical section (51), said distribution channels running substantially in the axial direction. |
