Method and apparatus for compression molding plastic articles

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...

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264268, 2642976, 264310, 425149, 425150, 425348, 425453, 425457, 425809, B29C 4308, B29C 4318, B29C 4358

Patent

active

060745835

ABSTRACT:
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.

REFERENCES:
patent: 4776782 (1988-10-01), Murayama et al.
patent: 5554327 (1996-09-01), Ingram et al.
patent: 5670100 (1997-09-01), Ingram

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