Apparatus for high-pressure forming of plastics sheets

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 51/42 (2006.01) B29C 51/10 (2006.01) B29C 51/14 (2006.01) B29C 51/24 (2006.01) B29C 51/26 (2006.01) B29C 35/08 (2006.01)

Patent

CA 2066937

Plastics sheets having film thicknesses between 0.05 and 2.5 mm have a fluid pressure medium applied to them at a temperature below plastics softening temperature and are isostatically formed under a medium pressure which is higher than 20 bar. An automatically working apparatus developed for this purpose comprises at least: - a continuous string (6) of shiftable, frame-like pallets (5) which are advanced by a conveyor (11') step by step; - a loading station (20) in which one sheet to be formed (3) each is placed on one of the pallets (5) in defined arrangement; - a heating station (40) in which each sheet (3) is heated to a defined temperature; - a forming station (50) with a forming tool (51) disposed in a press (70) the drive (100) of which is capable of producing a considerable mould closing force; and - an unloading station (160) in which the formed sheet (5) is removed from its pallet (5) and directed into a collecting device (163).

Cette invention concerne une méthode de façonnage de plaques de plastique d'une épaisseur comprise entre 0.05 et 2.5 mm par pressage isostatique sous une pression de fluide supérieure à 20 bars et à une température inférieure au point de ramollissement du plastique. Une machine automatique développée à cette fin comprend au moins : un chapelet continu de palettes-cadres mobiles (5) déplacées pas à pas par un transporteur (11'), un poste de chargement (20) où les plaques de plastique (3) sont déposées selon une oriention définie sur les palettes-cadres qui y défilent, un poste de chauffage (40) où chaque plaque (3) est portée à une température définie, un poste de façonnage (50) comportant une matrice (51) animée par une presse (70) dont l'erntraînement peut développer une force considérable de fermeture de moule et un poste de déchargement (160) où les plaques façonnées (5) sont enlevées des palettes (5) et acheminées dans un accumulateur (163).

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