Hot runner heater device and method of manufacture thereof

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/27 (2006.01) F24H 1/10 (2006.01) H05B 3/42 (2006.01)

Patent

CA 2479752

A heater device (10) used for mold injection processes and related method for manufacturing the same is disclosed. The heater device (10) comprises an inner sleeve (12) having a hollow tubular body with opposed flanges (36) formed at either end thereof and a resistive element (16) wound around the body of the inner sleeve (12). In assembly, the inner sleeve (12) is disposed inside and engaged to an outer sleeve (14) having a hollow tubular body with opposed openings (50, 52) that communicate with a cavity (46) defined between the inner and outer sleeves (12, 14). The outer sleeve (14) further defines a first aperture (44) for permitting connection of terminal leads to the resistive element (16) inside the outer sleeve (14) during manufacturing. During manufacture, a slurry of ceramic insulation material (62) is injected through a second aperture (45) in order to completely fill the cavity (46) and encase the resistive element (16).

L'invention a trait à un dispositif de chauffage (10) destiné à des procédés de moulage par injection, et à un procédé correspondant permettant de fabriquer ce dernier. Le dispositif de chauffage (10) comprend un manchon interne (12) possédant un corps tubulaire creux doté d'ailes opposées (36) formées à chacune de ses extrémités, et un élément résistif (16) enroulé autour du corps du manchon interne (12). Lors de l'assemblage, le manchon interne (12) est disposé à l'intérieur d'un manchon externe (14) et emboîté dans ce dernier, le manchon externe (14) possédant un corps tubulaire creux doté d'ouvertures opposées (50, 52) qui communiquent avec une cavité (46) définie entre les manchons interne et externe (12, 14). Le manchon externe (14) définit également une première ouverture (44) permettant de relier des conducteurs de borne à l'élément résistif (16) situé à l'intérieur du manchon externe (14) lors de la fabrication. Pendant la fabrication, un coulis de matière isolante céramique (62) est injectée à travers une seconde ouverture (45), de façon à remplir entièrement la cavité (46) et à enrober l'élément résistif (16).

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