INJECTION-MOLDED HEAT VALVE GATE DEVICE

摘要

PURPOSE: To provide a thermal gated injection molding apparatus having melt distribution plates to allow the outer melt passage to have four radially spaced channels extending through each nozzle to a gate in a separate heated cavity forming insert. CONSTITUTION: In a multi-cavity injection molding apparatus to coinject pressurized melt from two or more melt sources, an inner melt passage extends through a melt distribution plate and an adjacent heated nozzle. The nozzle has a tapered nose which extends into an adjacent heated cavity forming insert having a gate leading to one of the cavities. An outer melt passage is separated by curved conduits on opposite faces of the melt distribution plate into four channels which are radially spaced around the central bore of the nozzle. The four channels lead to a melt funnel duct which extends in the adjacent cavity forming insert around the nose portion of the nozzle. Thus the melt from the outer melt passage is evenly distributed around the melt from the inner melt passage when they join just before entering the gate.