Hot sprue valve assembly for an injection molding machine

Details Hot sprue valve assembly for an injection molding machine Hot sprue valve assembly for an injection molding machine

B - Operations, Transporting

29

D

18/99

B29D 17/00 (2006.01) B29C 45/26 (2006.01) B29C 45/28 (2006.01) B29C 45/38 (2006.01)

Patent

CA 1160009

HOT SPRUE VALVE ASSEMBLY FOR AN INJECTION MOLDING MACHINE ABSTRACT OF THE DISCLOSURE A hot sprue valve assembly is provided for controlling flow of molten material through a hot sprue bushing of an injection molding machine The valve assembly is particularly designed for use with an injection molding machine for molding centrally apertur- ed record discs, such as video information discs, and the valve assembly includes means for forming the central aperture in the disc. In one embodiment, the aperture-forming means comprises a sleeve valve for molding the aperture in the disc prior to solidification of the disc-forming melt, whereas in another embodiment the aperture-forming means comprises a punch for punch- ing the aperture subsequent to solidification of the disc-forming melt.

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