Production of reinforced plastic pipes

Details Production of reinforced plastic pipes Production of reinforced plastic pipes

B - Operations, Transporting

29

C

154/53.06

B29C 53/74 (2006.01)

Patent

CA 1102672

ABSTRACT OF THE DISCLOSURE This invention relates to a method for continuously producing a reinforced plastic pipe having a spigot fitting of the desired outside diameter and surface shape. The method comprises helically winding an endless belt on a rotating mandrel, continuously winding a molding material impregnated with a thermosetting resin on the endless belt, continuously moving the molding material toward the tip of the mandrel together with the endless belt by the rotation of the mandrel, passing the moving molding material through a curing zone to cure the thermosetting resin, and then removing the molding material from the endless belt at the tip portion of the mandrel. Prior to the introduction of the molding material into the curing zone, a split ring mold having an inside surface of a desired shape is mounted around the molding material so as to clamp the molding material tightly, thereby to convert the shape of the outside surface of the molding material into one corresponding to the shape of the inside surface of the split ring mold. After the leaving of the molding material from the curing zone, the split ring mold is removed from the molding material, and that portion of the molding material on which the mold has been mounted is severed to provide a reinforced plastic pipe having a spigot element of a desired outside diameter and a desired outside surface shape. The method of this invention is faster and less complicated than the known batchwise methods.

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