Fabricating steel pipe with an integrally formed liner

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/02 (2006.01) B21C 37/12 (2006.01)

Patent

CA 2187331

A metal pipe (46) and method of forming the same with an integrally formed liner for use in corrosive and abrasive environments is disclosed. The liner is comprised of a relatively thick polyethylene (40) which is thermally bonded to the metal pipe. An inter- mediate co-extruded polymer layer of ethylene acrylic acid and a polyethyl- ene/ethylene acrylic acid blend is applied to the metal pipe to facilitate thermal bonding. The intermediate layer is ap- plied to the sheet metal (11) in a pre- treatment process and prior to roll form- ing ribs into the sheet metal. The liner is applied to provide a smooth surface which is resistant to corrosive and abra- sive action in sanitary or culvert applica- tions. Anchors for further securing the liner to the pipe may be formed within the ribs.

Procédé de formage d'un conduit métallique (46) à revêtement solidaire destiné à être utilisé dans des environnements abrasifs et corrosifs. Ce revêtement est en polyéthylène relativement épais (40) thermosoudé audit conduit métallique. Une couche de polymère intermédiaire co-extrudée, constituée d'un mélange d'un acide acrylique d'éthylène et d'un acide acrylique de polyéthylène ou d'éthylène, est appliquée au conduit métallique pour faciliter le thermosoudage. Cette couche intermédiaire est appliquée à la tôle (11) au cours d'un traitement préalable à l'opération de laminage destiné à former des nervures sur la tôle. Le revêtement de polyéthylène est appliqué pour offrir une surface lisse résistante à l'action corrosive et abrasive lors de l'utilisation dans des applications sanitaires ou de drainage. Des ancrages permettant de mieux fixer le revêtement au conduit peuvent être formés à l'intérieur des nervures.

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