Method for fabricating composite pressure vessels and...

B - Operations – Transporting – 29 – C

Patent

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B29C 70/44 (2006.01)

Patent

CA 2343283

A process for making a composite vessel includes the steps of: A) preforming a composite shell (63) for the vessel (for example, by winding fiberglass and a thermoplastic material onto a thermoplastic mandrel) which includes a thermoplastic film liner (66) sealing the interior surface thereof; B) in a mold (60) (which optionally may be heated), heating the composite shell and thermoplastic film liner while applying at least one force (9) (by, for example, evacuating the mold, pressurizing the thermoplastic film liner or both) which tends to urge the thermoplastic film liner and the composite shell outwardly; C) continuing step B) until the thermoplastic film liner and the composite shell consolidate and the exterior surface of the composite shell becomes fluid and flows to conform to the interior surface of the mold, thereby forming the composite vessel; D) allowing the formed composite vessel to cool; and E) removing the formed composite vessel from the mold. Suitable thermoplastic materials includes: polyethylene, polypropylene, polybutylene terephthalate and polyethylene terephthalate. The resulting composite vessel exhibits superior mechanical and aesthetic properties.

L'invention concerne un procédé de fabrication d'une cuve composite qui consiste en ce qui suit: a) préformer une coque composite (43) pour la cuve (par exemple, en enroulant une fibre de verre et un matériau thermoplastique (66) sur un mandrin thermoplastique) qui comprend une couche de film thermoplastique étanchéifiant sa surface interne; b) chauffer la coque composite et la couche de film thermoplastique dans un moule (60) (éventuellement chauffé) tout en appliquant au moins une force (9) (par exemple, en évacuant le moule, en mettant sous pression la couche de film thermoplastique ou en effectuant les deux) qui pousse vers l'extérieur la coque composite et la couche de film thermoplastique; c) poursuivre l'étape b) jusqu'à ce que la coque composite et de la couche de film thermoplastique se consolident et que la surface de la coque composite devienne fluide et s'écoule pour se conformer à la surface interne du moule en formant ainsi la cuve composite; d) permettre à la cuve composite ainsi formée de refroidir et e) enlever du moule la cuve composite ainsi formée. Les matériaux thermoplastiques appropriés comprennent ce qui suit: polyéthylène, polypropylène, téréphthalate de polybutilène et téréphthalate de polyéthylène. La cuve composite ainsi obtenue possède des propriétés mécaniques et esthétiques exemplaires.

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