Method and apparatus for compression molding plastic articles

Details Method and apparatus for compression molding plastic articles Method and apparatus for compression molding plastic articles

B - Operations, Transporting

29

C

B29C 43/08 (2006.01) B29C 43/36 (2006.01) B29C 43/42 (2006.01) B29C 43/50 (2006.01) B29C 43/58 (2006.01) B29C 49/36 (2006.01) B29C 49/64 (2006.01) B30B 11/00 (2006.01) B30B 11/08 (2006.01) B30B 15/28 (2006.01) B29C 31/00 (2006.01) B29C 31/04 (2006.01) B29C 37/00 (2006.01) B29C 49/06 (2006.01)

Patent

CA 2178063

A method and apparatus for compression molding plastic articles including closures which includes providing co-acting sets of tools including a first set for moving a core and core sleeve into engagement with a cavity mold on a second set of tooling. An actuator is provided between the first set of tooling and a fixed upper cam. The second set of tooling includes an associated actuator supporting the cavity mold and associated with a lower fixed cam. A nitrogen cylinder in the second set of tooling provides for control of the compression molding force. In a preferred form, a plurality of sets of tooling are provided in circumferentially spaced relation on a rotating turret supported by a central column. A common manifold supplies the pressure at accurately controlled pressure to each of the nitrogen cylinders. A control system is provided for monitoring and changing the pressure.

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