Injection molding one-piece insert having cooling chamber...

Details Injection molding one-piece insert having cooling chamber... Injection molding one-piece insert having cooling chamber...

B - Operations, Transporting

29

C

B29C 45/28 (2006.01) B29C 45/27 (2006.01) B29C 45/73 (2006.01)

Patent

CA 2126431

An injection molding one-piece gate and cavity insert to be mounted between a heated nozzle and a cavity. The insert has a cooling fluid chamber extending around the central gate with a thin cavity wall portion extending between the cooling fluid chamber and a convex portion of the cavity. Alternating frontwardly and rearwardly projecting rib portions extend radially into the cooling fluid chamber to form a pair of tortuous passages between them for cooling fluid flowing each way around the insert from an inlet to an outlet. In addition to providing more cooling because of turbulent flow of the cooling fluid and their increased surface area, these rib portions also substantially increase the strength of the insert to withstand repetitive injection pressure in the cavity.

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