Method of forming a molded plastic article having at least...

B - Operations – Transporting – 29 – C

Patent

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B29C 45/16 (2006.01)

Patent

CA 2660993

The method of forming a molded plastic article having at least one molded extension from a second surface and a first surface substantially free of sink mark defects. The method involves providing a mold that includes a first mold portion having a recess. A first plastic material is introduced into the recess to form a molded extension. After partial solidification of the extension, the part ejector pushes the upper surface and upper portion of the molded extension out of the recess, while a lower portion of the molded extension remains within the recess. A second plastic material is introduced into the mold to form a molded body in which the upper surface and upper portion of the molded extension are immersed and embedded. The lower portion of the molded extension extends from the second surface and the first surface is substantially free of sink mark defects opposite the molded extension.

La présente invention concerne un procédé de formage d'un article en plastique moulé ayant au moins une extension moulée à partir d'une seconde surface et une première surface sensiblement dépourvue de défauts de dépression en surface. Le procédé prévoit de fournir un moule comprenant une première partie de moulage ayant un évidement. Un premier matériau en plastique est introduit dans l'évidement pour former une extension moulée. Après la solidification partielle de l'extension, la partie éjecteur pousse la surface supérieure et la partie supérieure de l'extension moulée hors de l'évidement, tandis qu'une partie inférieure de l'extension moulée reste à l'intérieur de l'évidement. Un second matériau en plastique est introduit dans le moule pour former un corps moulé dans lequel la surface supérieure et la partie supérieure de l'extension moulée sont immergées et incorporées. La partie inférieure de l'extension moulée s'étend depuis la seconde surface et la première surface est sensiblement dépourvue de défauts de dépression en surface à l'opposé de l'extension moulée.

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