Production of tubular body comprising two or more layers of...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 9/04 (2006.01) B21C 37/12 (2006.01) F16L 9/128 (2006.01)

Patent

CA 2684924

Process for the manufacture of an elongated, multilayered tubular body (1) comprising an elongated, tubular inner hollow core (5), optionally an elongated, tubular inner casing (4) and an elongated, tubular outer casing, the inner casing, when present, surrounding the hollow core, the outer casing surrounding the inner casing, when present, or otherwise the hollow core, the outer casing comprising at least two layers (2, 3), each layer consisting of one or more longitudinally preformed, flat elongated metal strips, the preforming of the strips such that the strips have been bent helically in such a way that the consecutive windings of the helix or helices touch or almost touch to each other, each strip in one layer overlapping with other strips in other layers, the layers in the outer casing being bound to each other by an adhesive.

La présente invention concerne un procédé pour la fabrication d'un corps tubulaire multicouche élongé (1) comprenant un noyau interne creux, tubulaire, élongé (5), en option un logement interne tubulaire élongé (4) et un logement externe tubulaire et élongé, le logement interne, quand il existe, entoure le noyau creux, le logement externe entourant le logement interne, quand il existe, ou sinon le noyau creux, le logement externe comprenant au moins deux couches (2, 3), chaque couche étant constituée d'une ou de plusieurs bandes métalliques élongées, plates, préformées de manière longitudinale, le préformage des bandes étant réalisé de sorte que les bandes soient courbées de manière hélicoïdale de sorte que les enroulements consécutifs de l'hélice ou des hélices entrent en contact ou entrent presque en contact les unes avec les autres, chaque bande dans une couche se superposant à d'autres bandes dans d'autres couches, les couches dans le logement externe étant liées les unes aux autres à l'aide d'un adhésif.

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