Process for the production of a polymer layer of a flexible...

B - Operations – Transporting – 29 – C

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B29C 47/02 (2006.01) B29C 35/10 (2006.01) B29D 23/00 (2006.01) B29C 35/02 (2006.01) B29C 35/08 (2006.01) F16L 11/08 (2006.01) F16L 11/14 (2006.01)

Patent

CA 2478814

The invention relates to a process for the production of a polymer layer of a flexible unbonded offshore pipe. The process comprises the steps of shaping a polymer material by extrusion into or onto a supporting unit in an extrusion station and cross-linking said extruded polymer material, said polymer material comprising a polyethylene and a peroxide for providing a cross- linking of the polymer material. The peroxide has an activation temperature substantially above the temperature of the polymer material during the extrusion thereof. The crosslinking of the extruded polymer material is carried out by exposing the extruded polymer material to electromagnetic waves, selected from the group consisting of infrared radiation and microwave. The invention also relates to a flexible unbonded offshore pipe comprising such polymer layer.

l'invention concerne un procédé de fabrication de couches polymère pour conduite sous-marine souple non collée. Ce procédé consiste à : façonner un matériau polymère par extrusion dans ou sur une unité-support sur un poste d'extrusion et réticuler ledit polymère extrudé, lequel comprend un polyéthylène et un peroxyde assurant la réticulation du matériau polymère. Le peroxyde possède une température d'activation sensiblement supérieure à la température du matériau polymère pendant l'extrusion. Pour la réticulation du matériau polymère extrudé, on expose ledit matériau à des ondes électromagnétiques prises dans le groupe composé d'un rayonnement infrarouge et de micro-ondes. Cette invention concerne également une conduite sous-marine souple non collée renfermant une telle couche polymère.

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