Patent ID: 7413431

Claim:
An injection molding nozzle, comprising: an outer insert; and an inner insert configured to engage the outer insert, the inner insert configured for being centered within the outer insert, wherein centering between the inner insert and outer insert occurs along a cylindrical surface of contact between them, wherein on the inside the inner insert has a central duct for the delivery of molten plastic, and wherein on the outside the inner insert has a portion having a shape designed for torquing, followed by an engaging portion for engaging said outer insert, followed by a cylindrical portion for centering the inner insert with respect to the outer insert, followed by a finned portion having a first plurality of fins circumferentially disposed around the outside of the inner insert, said first plurality of fins forming a first plurality of flow channels between two adjacent fins, said first plurality of flow channels being in fluid communication with said central duct, on the outside said inner insert is further followed by a non-finned portion, and further followed by a second finned portion having a second plurality of fins circumferentially disposed around the outside of the inner insert, said second plurality of fins forming a second plurality of flow channels between two adjacent fins, said second plurality of flow channels being in fluid communication with said first plurality of flow channels, and followed by a reduced cylindrical portion that tapers off into a conical end of the inner insert.