Temperature control device provided in a plastic processing...

B - Operations – Transporting – 29 – C

Patent

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18/703

B29C 45/74 (2006.01) B29C 47/82 (2006.01)

Patent

CA 2015886

The temperature control device comprises heat transfer shells, each of which consists of two shell sections, each of which consists of a metal casting, in which a single temperature control element is embedded. The temperature control element has been formed from a tubular blank to comprise at least one loop and is formed with locating surfaces, which are exposed to recesses formed in the inside and outside peripheral surfaces of the shell section. Owing to that design the metal castings may be made by die casting under relatively high injection pressures and with a much smaller wall thickness so that the inside peripheral contacting surfaces of the shell sections can much more snugly contact the plasticizing cylinder or the nozzle and a temperature change can be effected at a higher rate.

Dispositif de contrôle de température comprenant des coques de transfert de chaleur, chacune étant constituée de deux sections composées d'une pièce de fonte dans laquelle un seul élément de contrôle de température est enchâssé. L'élément de contrôle de température est constitué d'une découpe tubulaire, pour intégrer au moins une boucle, formé avec les surfaces repères, lesquelles sont exposées à des enfoncements dans les surfaces périphériques intérieures et extérieures de la coque. Dans le cadre de cette conception, les pièces de fonte peuvent être fabriquées par coulée sous pression, à des pressions d'injection relativement élevées et avec une épaisseur de paroi beaucoup plus mince, de sorte que les surfaces de contact périphérique intérieures des sections de coque peuvent être mises en contact beaucoup plus étroitement avec le cylindre ou la buse de plastification et qu'il est possible de provoquer un changement de température plus rapidement.

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