| 摘要 |
The invention refers to an injection molding apparatus comprising: a first manifold (12) having a first manifold channel (14) for receiving a first melt stream of moldable material under pressure, said first manifold channel (14) having a first outlet for delivering the first melt stream to a first nozzle channel (52) of a nozzle (30); a second manifold (22) having a second manifold channel (24) for receiving a second melt stream of moldable material under pressure, said second manifold channel having a second outlet (29) for delivering the second melt stream to a second nozzle channel (54) of said nozzle (30); a mold cavity (60) receiving said first melt stream and said second melt stream from said nozzle (30), said first nozzle channel (52) and second nozzle channel (54) communicating with said mold cavity (60) through a mold gate (34); a gating mechanism for selectively enabling communication between said first nozzle channel (52), said second nozzle channel (54) and said mold gate (34); an injection piston (70) extending through a channel (80) located between said first outlet of said first manifold (12) and said first nozzle channel (52) of said nozzle (30), said injection piston (70) being slidable through said channel (80) and having an outer wall for abutting an inner wall of said channel (80), said injection piston (70) being movable from a retracted position to an extended position to force melt towards said mold cavity (60); wherein movement of said injection piston (70) towards said extended position forces melt located in a melt chamber of said first nozzle channel (52) to flow into said mold cavity (60). <IMAGE> |
