Heating device for injection mold apparatus

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/72 (2006.01) B29C 45/20 (2006.01) B29C 45/27 (2006.01)

Patent

CA 2263537

This invention provides an improved heating apparatus for controlling the temperatures of the resin melt that is pressure fed to a molding cavity comprising a heating jacket (30) comprising the concentric tubular elements; a copper sheath (32) having an inside surface (34) and an outer surface (36), a retainer sleeve (40) and coiled heating element (42) sandwiched between the sheath (32) and the retainer sleeve (40). The inside surface of the sheath (32) is formed with at least one circumferential groove (38) which provides an insulating air gap so that a lesser amount of heat is conducted to the central portion of the heating jacket (30) thereby creating three distinct temperature zones. The outer surface (23) of the nozzle (22) is provided with a longitudinal groove (46) extending down its outside surface between the sheath (32) and the nozzle housing (22) for the hot runner conduit (24). A thermocouple sensor cable (52) is received in the longitudinal groove so that the thermocouple sensor (50) is strategically positioned adjacent the gate well section (28) to maintain the temperature of the resin melt entering the cavity.

L'invention concerne un appareil de chauffage amélioré, qui est utilisé pour réguler la température de la résine fondue qui est amenée sous pression dans une cavité de moulage. Ladite cavité de moulage comprend une chemise de chauffage (30), laquelle comprend des éléments tubulaires concentriques; une gaine protectrice (32) en cuivre ayant une surface (34) intérieure et une surface (36) extérieure, un manchon (40) de retenue et un élément (42) chauffant en spirales pris entre la gaine protectrice (32) et le manchon (40) de retenue. La surface intérieure de la gaine protectrice (32) fait pendant à au moins une rainure (38) circonférentielle qui fournit un espace d'air isolant de façon qu'une faible quantité de chaleur soit amenée dans la partie centrale de la chemise de chauffage (30), créant ainsi trois zones de température distinctes. La surface (23) extérieure de la buse (22) présente une rainure (46) longitudinale qui s'étend vers le bas le long de sa surface extérieure, entre la gaine protectrice (32) et le logement de la buse (22), pour recevoir un canal chauffé (24). Un câble (52) de capteur thermocouple est reçu dans la rainure longitudinale de façon que le capteur thermocouple (50) soit contigu à la section (28) puits d'entrée de façon à maintenir la température de la résine fondue entrant dans la cavité.

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