Device for granulating a thermoplastic, which is extruded...

B - Operations – Transporting – 29 – B

Patent

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B29B 9/06 (2006.01)

Patent

CA 2454071

The invention relates to a device for granulating thermoplastics that are extruded from nozzles, the latter being provided in a nozzle disc in a substantially circular arrangement. Blades, which rotate about a blade carrier shaft and are held by a bell-shaped blade carrier in an oblique position in relation to the radial direction, sweep over said nozzles. The blade carrier shaft runs through the centre of the circular assembly, a cooling medium is fed to the nozzle disc and the blades to cool the granulated plastics and an annular intermediate chamber, traversed by the cooling medium from the interior to the exterior, is located between the blade carrier and the nozzle disc. The cavity (24) of the bell-shaped blade carrier is connected to the intermediate chamber and the cooling medium is supplied to the intermediate chamber from the cavity of the blade carrier.

L'invention concerne un dispositif de granulation de matières thermoplastiques extrudée à partir de buses, lesquelles sont montées dans un plateau à buses dans un dispositif sensiblement circulaire, la matière venant en contact avec des lames entraînées en rotation autour d'un axe de porte-lames, lesdites lames étant maintenues par un porte-lames en forme générale de cloche, en position inclinée par rapport à la direction radiale. L'axe du porte-lames passe par le centre du dispositif circulaire. Un fluide de refroidissement est amené au plateau à buses et aux lames, en vue de réfrigérer la matière plastique granulée, cependant qu'il est prévu entre le porte-lames et le plateau à buses, un espace intermédiaire annulaire parcouru de l'intérieur vers l'extérieur par le fluide de refroidissement. L'espace vide (24) du porte-lames en forme de cloche est en communication avec l'espace intermédiaire, et le fluide de refroidissement est amené à l'espace intermédiaire en provenance de l'espace vide du porte-lames.

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