Method and apparatus for compression molding plastic articles

B - Operations – Transporting – 29 – C

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B29C 43/04 (2006.01) B29C 43/08 (2006.01) B29C 43/32 (2006.01) B29C 43/42 (2006.01) B29C 43/50 (2006.01) B29C 43/58 (2006.01) B30B 11/00 (2006.01) B30B 11/08 (2006.01) B29C 37/00 (2006.01)

Patent

CA 2247590

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.

Méthode et appareil pour des articles en plastique à moulage par compression, incluant des fermetures. L'appareil comprend des jeux d'outillage coopératifs incluant un premier jeu pour déplacer un poinçon et un manchon de poinçon en engagement avec un moule à cavité sur un deuxième jeu d'outillage. Un actionneur est fourni entre le premier jeu d'outillage et une came supérieure fixe. Le deuxième jeu d'outillage inclut un actionneur correspondant supportant le moule à cavité et associé à une came inférieure fixe. Une cartouche d'azote située dans le deuxième jeu d'outillage contrôle la force du moulage par compression. Dans une version préférée, plusieurs jeux d'outillages sont placés en relation espacée circulaire sur une tourelle revolver supportée par une colonne centrale. Un collecteur commun distribue la pression à un niveau contrôlé de manière précise à chaque cartouche d'azote. Un système de commande est fourni pour surveiller et changer la pression.

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