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

B - Operations – Transporting – 29 – C

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B29C 45/16 (2006.01)

Patent

CA 2661032

A method of forming a molded plastic article (2) having a second surface (56) with molded extensions (59), and a first surface (69) that is substantially free of sink mark defects. The method involves forming, from a first plastic material, a first molded section (50) having at least one molded extension (59) extending from the second surface (56). A second plastic material is introduced into the mold (1) over the first molded section (50), and a portion thereof passes through the aperture (71) and into the retainer cavity (74), thereby forming a second molded section (108) that is continuous with each retainer (96). The first and second molded sections, which together form the molded article (2), are attached to each other by at least one molded retainer (96) and the first surface (111 ) of the second molded section, which defines the first surface (69) of the molded article (2).

La présente invention concerne le formage d'un article en plastique moulé (2) ayant une seconde surface (56) dotée d'extensions moulées (59) et une première surface (69) sensiblement dépourvue de défauts de dépression en surface. Le procédé comprend le formage, à partir d'un premier matériau en plastique, d'une première section moulée (50) ayant au moins une extension moulée (59) s'étendant depuis la seconde surface (56). Un second matériau en plastique est introduit dans le moule (1) par-dessus la première section moulée (50) et une partie de celui-ci passe par l'ouverture (71) et entre dans la cavité de retenue (74), formant ainsi une seconde section moulée (108) dans la continuité de chaque retenue (96). Les première et seconde sections moulées, qui forment ensemble l'article moulé (2), sont fixées l'une à l'autre par au moins une retenue moulée (96) et la première surface (111) de la seconde section moulée, définissant ainsi la première surface (69) de l'article moulé (2).

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