Making an elongated product

B - Operations – Transporting – 21 – C

Patent

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B21C 23/24 (2006.01) B32B 1/08 (2006.01) F16L 9/147 (2006.01)

Patent

CA 2640820

An elongated product is formed such that first a core is formed, the outer surface of the core being made of plastic. Thereafter, a tubular metal layer is extruded such that the layer is seamless. When the metal layer is extruded, a clearance is allowed between the metal layer and the core. After the metal layer has cooled, the diameter of the metal layer is reduced such that the metal layer contacts the plastic core. Thereafter, the metal is annealed such that the flexibility of the metal layer increases.

L'invention concerne un produit allongé qui est fabriqué de manière qu'en premier lieu, un coeur soit formé, la surface externe de ce coeur étant en plastique. Une couche métallique tubulaire est ensuite extrudée de façon que ladite couche soit sans soudure. Une fois la couche métallique extrudée, un dégagement est admis entre ladite couche et le coeur. Une fois la couche métallique refroidie, son diamètre est réduit afin qu'elle vienne en contact avec le coeur en plastique. Le métal est ensuite recuit de façon à accroître la souplesse de la couche métallique.

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