Method of producing reformed crosslinked polyethylene articles

B - Operations – Transporting – 29 – C

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B29C 57/00 (2006.01) B29C 71/02 (2006.01)

Patent

CA 2187555

A method of producing reformed crosslinked polymer articles provides reformed crosslinked articles free of visible and objectionable folds, seams, and interfaces on reformed surfaces thereof. In a preferred embodiment, a method includes the steps of extruding a silane-grafted polyethylene tube, heating an end of the tube, reforming the end of the tube to produce a radially enlarged sealing surface thereon, cooling the reformed tube, and curing the reformed tube to produce an increase in the degree of crosslinking of the polyethylene material.

Méthode pour la production d'articles en polymère réticulé permettant d'obtenir des articles exempts de plis, de lignes de soudure et d'interfaces sur les surfaces remodelées. Dans une version privilégiée de l'invention, la méthode inclut les étapes de l'extrusion d'un tube de polyéthylène avec greffe de silane, le chauffage d'une extrémité du tube, le remodelage de l'extrémité du tube pour l'obtention d'une surface de scellement élargie suivant le rayon, le refroidissement du tube remodelé, et la réticulation du tube remodelé pour augmenter le degré de réticulation du polyéthylène.

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