Device for producing double- walled corrugated pipes

Details Device for producing double- walled corrugated pipes Device for producing double- walled corrugated pipes

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/12 (2006.01) B29C 47/20 (2006.01) B29C 49/00 (2006.01)

Patent

CA 2448163

Disclosed is a device for producing double-walled corrugated pipes (72) with an extrusion nozzle 12) and a cooling mandrel (14) protruding into a molding channel (16) formed by corrugator molding jaws (18, 20). The extrusion nozzle (12) comprises a first annular nozzle opening (34) for producing an outer shell (62) and a second annular nozzle opening (40) for producing an inner shell (64). The outer shell (62) produced by the first annular opening (34) is suctioned in the molding channel (16) with the aid of vacuum so that it is pressed against the corrugated cross-ribbed inner surface (66) of the corrugator molding jaws (18, 20). In order to prevent low pressure from acting upon the inner shell, i.e. to prevent a difference in pressure between the inside and outside of the inner shell (64) upon exit from the second annual ring opening (4), the extraction nozzle (12) is provided with at least one first and at least one second ventilation hole (74) and (76) which are connected to the surrounding area of the device.

La présente invention concerne un dispositif permettant la réalisation de tubes ondulés à paroi double (72), au moyen d'une buse d'extrusion (12) et d'un mandrin de refroidissement (14) qui dépassent dans un canal de moulage (16) formé par des mâchoires de moulage ondulées (18, 20). La buse d'extrusion (12) présente une première ouverture annulaire (34) servant à produire une gaine externe (62), et une seconde ouverture annulaire (40) servant à produire une gaine interne (64). La gaine externe (62) issue de la première ouverture annulaire (34) est aspirée dans le canal de moulage (16) grâce à une dépression pour être plaquée contre la surface interne à nervures transversales ondulée (66) des mâchoires de moulage ondulées (18, 20). Afin d'éviter que ceci n'entraîne l'action d'une dépression sur la gaine interne, c'est-à-dire l'apparition d'une différence de pression entre la face interne et la face externe de la gaine interne (64) issue de la seconde ouverture annulaire (40), la buse d'extrusion (12) comporte au moins un premier et au moins un second orifice d'aération (74) et (76) qui sont reliés à l'environnement extérieur du dispositif.

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