Coinjection molding of multi-layered articles

B - Operations – Transporting – 29 – C

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B29C 45/16 (2006.01)

Patent

CA 2286678

A multi-cavity coinjection mold having a relatively large plurality of cavities for simultaneously molding a relatively large plurality of multi- layered articles including a) a plurality of cavity groups (1) each defining a relatively small plurality of said cavities (3), a single balanced hot runner for supplying said relatively small plurality of cavities with contiguous different plastics materials, and a valve for sequentially supplying desired contiguous quantities of the plastics materials from plastics material sources, common to all of said groups, to the balanced hot runner; and b) a hot runner manifold system (50) connected to the plastic material sources (25, 27) to supply the plastic material to all of the valves; and related methods.

Moule à co-injection à cavités multiples en nombre relativement important, pour mouler simultanément une pluralité relativement importante d'articles multicouches. Ce moule comprend a) une pluralité de groupes de cavités (1), chacun de ces groupes comprenant une pluralité relativement réduite de ces cavités (3), un seul canal chauffé à distribution équilibrée pour distribuer des matières plastiques différentes contiguës dans cette pluralité relativement réduite de cavités, et une soupape pour délivrer de manière séquentielle dans le canal chauffé à distribution équilibrée ces quantités contiguës de matières plastiques provenant de sources de matériau plastique communes à tous les groupes; et b) un système collecteur (50) à canaux chauffés, relié aux sources (25, 27) de matières plastiques pour alimenter toutes les soupapes en matières plastiques. L'invention décrit en outre des procédés dans lesquels ce moule est utilisé.

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