Spiral wound pipe and a method for manufacturing the same

Details Spiral wound pipe and a method for manufacturing the same Spiral wound pipe and a method for manufacturing the same

B - Operations, Transporting

29

C

B29C 53/78 (2006.01) B29C 47/02 (2006.01)

Patent

CA 2353725

The invention relates to a spirally wound pipe and to a method and arrangement for producing it. The method according to the invention is characterized by the following steps: a flexible, elongate profile (2) is fed through an extrusion station (20) in which the profile is coated with an outer layer (3) of a weldable thermoplastic material along its entire periphery (4); after which the profile (2) is wound in spiral turns (5, 6) to form a pipe (1) about a rotating drum (30) while the said outer layer (3) from the extrusion station maintains such a temperature that the thermoplastic material is weldable, with the profile (2) in the last-wound spiral turn (5) being welded to the profile (2) in the next spiral turn (6) in such a way that a weld seam (7) is formed along the whole of the adjoining edge surfaces (8) of the profiles (2).

L'invention concerne un tube enroulé en spirale et un procédé ainsi qu'un agencement permettant sa production. Le procédé selon l'invention est caractérisé par les étapes suivantes: un profilé flexible allongé (2) est acheminé dans un poste d'extrusion (20) dans lequel le profilé est revêtu d'une couche extérieure (3) constituée d'une matière thermoplastique soudable sur toute sa périphérie (4); après quoi le profilé (2) est enroulé en spires spiralées (5, 6) pour former un tube (1) autour d'un tambour rotatif (30) alors que ladite couche extérieure (3) provenant du poste d'extrusion maintient une température permettant de souder la matière thermoplastique, le profilé (2) dans le dernier enroulement de la spire spiralée (5) étant soudé au profilé (2) se trouvant dans la spire spiralée suivante (6) de manière à former un cordon de soudure (7) sur la totalité des surfaces de bordure contiguës (8) des profilés (2).

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