Apparatus and a method for the protection of ribbed pipes

Details Apparatus and a method for the protection of ribbed pipes Apparatus and a method for the protection of ribbed pipes

B - Operations, Transporting

29

C

18/758

B29C 53/30 (2006.01) B29C 47/12 (2006.01) B29C 47/86 (2006.01) B29C 47/88 (2006.01) B29C 47/90 (2006.01)

Patent

CA 1275773

Abstract of the disclosure This invention relates to an apparatus and a method for the production of ribbed pipes. The apparatus comprises a core positioned on the central axis thereof and around which a plasticized material is pressed from a nozzle. A kernel having an essen- tially constant diameter is positioned at the terminal end of the core for the calibration of the inner face of the pipe. The outer face of the pipe is shaped by the action of axially displaceable chill moulds. The end zone of the kernel is provided with means for the cooling of the inner face of the pipe. In known apparatuses the grooves of the chill moulds are often filled incompletely and the inner face of the pipe becomes uneven on account of air bubbles, for instance. These disadvantages can be avoided by providing the initial zone of the kernel with means for heating the inner face of the pipe and by shaping the surface of the initial zone in such a manner that it slightly expands conically in the production direction,

513625

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