A METHOD AND APPARATUS IN THE MANUFACTURE OF A SPIRALLY WOUND AND WELDED TUBE

摘要

The present invention relates to a method and apparatus in the manufacture of a spirally wound and welded tube.A thermoplastic profile (1) is slided along a path on sliding means (12, 13) arranged in an axial direction of said tube and defining a cylindrically shaped winding surface with a diameter corresponding to the inner diameter of the tube to be manufactured. The profile (1) is directed along a spiral path (S) towards a previous turn of said profile by means of radial rollers (10) spaced along said spiral path by adjusting the position (d) of the rollers: Opposite edges (1a, 1b) of said profile turns are welded together by providing an extruded welding mass (6) between said profile turns. The welded tube (4) is fed from the welding station by means the rollers (10) by sliding it onto a rotating support (2A).