Patent ID: 6666945
Filing Date: 2003-12-23
Classification: B29C,B29L,F16L,Y10T

Abstract:
A method for preparing an end of a thermoplastics tube manufactured by spirally winding and welding together of a first hollow profile having a substantially rectangular cross section, comprising:cutting the end of the tube by a planar transverse section; extruding a second hollow profile having a rectangular cross section and an outer shape essentially similar to that of the first hollow profile; spirally winding the extruded second hollow profile around a drum having a diameter corresponding to inner diameter of the tube; cutting a loop from the second hollow profile in a length corresponding to a circumference of the end of the tube; joining ends of the loop to each other, whereby a ring is formed having inner and outer diameters equal to inner and outer diameters of the spirally wound tube; placing the ring against the cut end of the tube; and welding the ring to the end of the tube.