Patent ID: 6663808
Filing Date: 2003-12-16
Classification: F16L

Abstract:
A method of producing a resinous pipe comprising at least one layer of thermally manipulated polymeric material, wherein said method comprises the steps ofa) providing a thermally manipulated polymeric material; b) heating said thermally manipulated polymeric material; c) applying said heated thermally manipulated polymeric material around a first end of a molding dorn having a first end and a second end, a length, and a width, measured as the diameter of said second end; wherein said dorn exhibits a greater surface area at said first end than at said second end; wherein the greater surface area of said first end is provided through a plurality of indentations therein; wherein said second end is round in shape; and wherein the longest diameter of said first end of said dorn, measured as the greatest distance between the greatest area of extension between the indentations therein, is substantially the same as the diameter of said second end of said dorn; d) subsequently moving said heated thermally manipulated polymeric material along the length of said dorn to said second end of said dorn to form a molded tubular shape from said thermally manipulated polymeric material; and e) cooling said thermally manipulated polymeric material in its molded shape to form a tube exhibiting substantially the same diameter throughout.