PROCESS FOR THE PRODUCTION OF A POLYMER LAYER OF A FLEXIBLE OFFSHORE PIPE AND A FLEXIBLE UNBONDED OFFSHORE PIPE

摘要

The invention relates to a process for the production of a polymer layer of aflexible unbonded offshore pipe. The process comprises the steps of shaping apolymer material by extrusion into or onto a supporting unit in an extrusionstation and cross-linking said extruded polymer material, said polymermaterial comprising a polyethylene and a peroxide for providing a cross-linking of the polymer material. The peroxide has an activation temperaturesubstantially above the temperature of the polymer material during theextrusion thereof. The crosslinking of the extruded polymer material iscarried out by exposing the extruded polymer material to electromagneticwaves, selected from the group consisting of infrared radiation and microwave.The invention also relates to a flexible unbonded offshore pipe comprisingsuch polymer layer.