Patent ID: 6156144
Filing Date: 2000-12-05
Classification: B29C,F16L

Abstract:
A process for fusion-jointing of plastic pipe parts, said process comprising the steps of:providing a first plastic pipe part and a second plastic pipe part to be fusion-jointed, each of said first and second plastic pipe parts having at least one distal end;providing an electrically heated socket having an inner diameter which corresponds to an outer diameter of the first and second pipe parts;butting the at least one distal end of the first plastic pipe part against the at least one distal end of the second plastic pipe part, forming a butt joint;heating the butt joint and an area of each of the first and second plastic pipe parts adjacent the butt joint, said heating being generated by heating means in said socket, wherein said first plastic pipe part, said second plastic pipe part, and said electrically heated socket are fusion-jointed together;wherein the heating step is conducted such that a portion of the distal ends of the first and second pipe parts closest to the butt joint are heated more intensely than a portion of the distal ends which is further from the butt joint, whereby fusion jointing occurs between an inner surface of the socket and an outer surface of the first and second pipe parts, and butt fusion jointing occurs along the butt joint.