Method and apparatus for compression molding plastic articles

摘要

A method and apparatus for compression molding plastic articles including closures, which includes providing co-acting sets of tools (27, 28) including a first set (27) for moving a core (41) and core sleeve (42) into engagement with a cavity mold (51) on a second set of tooling (28). An actuator (34) is provided between the first set of tooling and a fixed upper cam (29). The second set of tooling includes an associated actuator supporting the cavity mold and associated with a lower fixed cam (31). A nitrogen cylinder (39) 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 (22) supported by a central column (21). A common manifold supplies the pressure at accurately controlled pressure to each of the nitrogen cylinders (39). A control system is provided for monitoring and changing the pressure.