B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/70 (2006.01) B29C 43/42 (2006.01) B29C 43/50 (2006.01)
Patent
CA 2514148
An apparatus for molding a plastic closure includes a male mold assembly (12) including a forming pin (14) and an outer pin sleeve (16) which cooperate with a female mold (20) for defining a mold cavity (22). To facilitate mechanical stripping of a molded closure from the forming pin (14), pressurized air is introduced into the molded closure through at least one air passageway which extends axially between the forming pin (14) and pin sleeve (16). By outwardly expanding and forming the plastic closure during ejection from the forming pin, forces to which the closure is subjected during ejection are significantly reduced, thereby desirably reducing the amount of cooling of the closure that is required during the molding cycle prior to ejection. Significantly increased operating speeds for compression molding apparatus can thus be achieved.
L'invention concerne un appareil permettant de mouler un bouchon en plastique. Cet appareil comprend un système de moule mâle comprenant une tige de formage et un manchon de tige externe qui coopère avec un moule femelle pour définir une cavité de moule. Pour faciliter la séparation mécanique du bouchon moulé de la tige de formage, de l'air sous pression est introduit dans l'enceinte de moulage à travers au moins un passage qui s'étend dans la direction axiale entre la tige de formage et le manchon de la tige. La dilatation vers l'extérieur du bouchon de plastique pendant qu'il est éjecté de la tige de formage permet de réduire sensiblement les forces appliquées sur le bouchon pendant l'éjection, ce qui permet de diminuer le refroidissement nécessaire du bouchon pendant le cycle de moulage avant l'éjection. On obtient ainsi des vitesses de fonctionnement sensiblement accrues de l'appareil de moulage.
Abney Lindsey N.
Cemy David L.
Kamath Ramesh
Mishler Gregory L.
Oles David K.
Alcoa Closure Systems International Inc.
Sim & Mcburney
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