Nozzle for the injection of plastic substance

Details Nozzle for the injection of plastic substance Nozzle for the injection of plastic substance

B - Operations, Transporting

29

C

B29C 45/27 (2006.01)

Patent

CA 2402490

Nozzle for the injection of molten plastics, comprising a rear central portion (1) terminating with a plane surface (6) in its central zone, an outer annular element (5) terminating with a corresponding plane surface (7) on its rear side, wherein the terminal plane surface (6) of said central zone is situated in a more backward position with respect to the terminal plane surface (7) of said annular element, which is provided rearwards with a first annular groove (12) in the shape of an acute angle between the outer edge of the rear portion and the outer edge of the annular element. The latter is further provided forwards with a second annular groove (8) arranged at an acute angle inside the outer front edge of said rear portion. Said two annular grooves (12, 8) are opposing each other and spreading apart from each other, and the respective angles come substantially up on the side of each other at the same height of the nozzle.

L'invention concerne une buse d'injection de plastiques fondus, comprenant une partie arrière centrale (1) se terminant par une surface plane (6) dans sa zone centrale, et un élement annulaire extérieur (5) se terminant par une surface plane correspondante (7) sur sa partie arrière. La surface plane (6) terminale de ladite zone centrale est située plus en arrière par rapport à la surface plane (7) terminale de l'élément annulaire, qui comprend dans sa partie arrière une première encoche annulaire (12) en forme d'angle aigu entre le bord extérieur de la partie arrière et le bord extérieur de l'élément annulaire. Ce dernier comprend également dans sa partie avant une seconde encoche annulaire (8) située à un angle aigu à l'intérieur du bord avant extérieur de ladite partie arrière. Les deux encoches annulaires (12, 8) sont opposées et séparées l'une de l'autre, et les angles respectifs s'élèvent sensiblement sur le côté l'un de l'autre à la même hauteur de la buse.

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