FOERFARANDE FOER FRAMSTAELLNING AV EXTRUDERADE ROER SAMT ANORDNING FOER UTFOERANDE AV FOERFARANDET.

摘要

PCT No. PCT/SE84/00128 Sec. 371 Date Dec. 11, 1984 Sec. 102(e) Date Dec. 11, 1984 PCT Filed Apr. 9, 1984 PCT Pub. No. WO84/04070 PCT Pub. Date Oct. 25, 1984.A method of manufacturing extruded pipes where plasticized material, for example plastic material, is advanced to an extrusion nozzle comprising a circular gap (2). The method is especially characterized in that the material is transported axially in said gap (2) while material is moved, for example rotated, in the circumferential direction of the gap (2) so that the material at least partially is caused to assume an orientation deviating from the axial direction, whereby a non-axial orientation will prevail in the extruded pipe (3) and increase the strength. The invention also relates to an apparatus for carrying out the method.