Method and an apparatus for the extrusion of plastic pipes

Details Method and an apparatus for the extrusion of plastic pipes Method and an apparatus for the extrusion of plastic pipes

B - Operations, Transporting

29

C

18/758, 18/785

B29C 47/20 (2006.01) B29C 59/02 (2006.01)

Patent

CA 1281523

Abstract of the disclosure The invention relates to a method and an appratus for the extrusion of plastic pipes. Today, plastic pipes are provided with a sleeve in such a manner that the end of the pipe is heated, whereafter the end is expanded by means of a mandrel or a pressure medium. This step requires a separate sleeve machine, and it also takes plenty of time and consumes thermal energy. According to the invention a sleeve (22) is formed in connection with the extrusion of a pipe in an apparatus in which a mandrel (8) is surrounded by chill moulds (1, 2) moving in the axial direction of the apparatus. The sleeve is formed by providing some of the chill moulds with a recess (16) the shape of which corresponds to that of the sleeve (22) and by pressing a plasticized plastic hose (11) extruded through a nozzle (10) against the walls of the recess in the area thereof by means of pressure air. (Figure 2)

528567

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