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An injection molding heated manifold having a melt passage with a longitudinal portion to convey melt from a molding machine to a number of different nozzles. The steel manifold has a pair of cooling bores extending parallel to and equally spaced on opposite sides of the longitudinal portion of the

An injection molding heated manifold having a melt passage with a longitudinal portion to convey melt from a molding machine to a number of different nozzles. The steel manifold has a pair of cooling bores extending parallel to and equally spaced on opposite sides of the longitudinal portion of the melt channel. A cooling fluid, such as air, flows through the cooling bores to quickly cool the manifold after the system is shut down to minimize deterioration of the melt in the melt channel. The air flows helically around spiral vanes which are mounted in the cooling bores to avoid temperature stratification along the melt passage.

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In an elongated injection molding steel heated manifold having a first end, an opposite second end and a melt passage with a longitudinal portion extending therethrough to convey melt received at an inlet from a molding machine to a plurality of outlets, each outlet leading to a heated nozzle, the i

In an elongated injection molding steel heated manifold having a first end, an opposite second end and a melt passage with a longitudinal portion extending therethrough to convey melt received at an inlet from a molding machine to a plurality of outlets, each outlet leading to a heated nozzle, the improvement comprising; a pair of cooling bores to convey cooling fluid therethrough extending longitudinally through the manifold from said first end of the manifold to said second end of the manifold, the pair of cooling bores extending parallel to the longitudinal portion of the melt passage and being equally spaced on opposite sides of the longitudinal portion of the melt passage, each cooling bore extending from an inlet at the first end of the manifold to an outlet at the second end, each cooling bore having a spiral vane mounted directly therein to provide one way turbulent flow of the cooling fluid therethrough.