Method and machine for compression molding closure shells

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 43/36 (2006.01) B29C 33/00 (2006.01) B29C 43/50 (2006.01)

Patent

CA 2627871

A compression molding machine, for compression molding a closure shell (128) having a base wall with an opening, includes a male mold section (54) and a female mold section (56) having associated surfaces that oppose each other to form a cavity for compression molding the base wall of the closure shell . An annular bead ( 114) on one of these surfaces cooperates with the opposing other surface to compression mold a disk connected to the base wall by a thin frangible web. The disk and the shell are stripped separately from the mold so that the shell emerges from the machine with the opening formed in the shell base wall by removal of the disk within the machine.

L~invention concerne une machine de moulage par compression permettant de réaliser le moulage par compression d~une coquille de fermeture (128) présentant une paroi de base dotée d~une ouverture. La machine de moulage par compression comprend une partie de moule mâle (54) et une partie de moule femelle (56) présentant des surfaces associées disposées en regard l~une de l~autre pour former une cavité de moulage par compression de la paroi de base de la coquille de fermeture. Un bord roulé annulaire (114) d~une de ces surfaces coopère avec l~autre surface opposée pour réaliser le moulage par compression d~un disque rattaché à la paroi de base par une bande mince cassante. Le disque et la coquille sont démoulés séparément de façon à ce que la coquille émerge de la machine avec une ouverture dans sa paroi de base formée par retrait du disque à l~intérieur de la machine.

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