Sprue bushing

Details Sprue bushing Sprue bushing

B - Operations, Transporting

29

C

18/702

B29C 45/20 (2006.01) B29C 45/17 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01)

Patent

CA 2037670

SPRUE BUSHING Abstract of the Disclosure A bushing used in an injection molding machine and positioned between the nozzle and the sprue thereof includes an adaptor body having a longitudinal axis, a first end and a second and. A first bore extends in the adaptor body parallel to the longitudinal axis from the second end to the first end for accommodating a flow of relatively viscous fluid such as a molten thermoplastic. A bridge extends transversely across the first bore between opposing walls of the bore adjacent the adaptor body first end. Fluid flow is allowed through the first bore around the bridge. A second bore extends from a surface of the adaptor body to a surface of the bridge for accommodating a flow of a relatively non-viscous fluid such as gas. The second bore terminates on the bridge surface so as to be substantially coaxial with the first bore.

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