Injection molding system with sequential gate control

Details Injection molding system with sequential gate control Injection molding system with sequential gate control

B - Operations, Transporting

29

C

B29C 45/80 (2006.01) B29C 45/28 (2006.01) B29C 45/76 (2006.01) B29C 45/77 (2006.01)

Patent

CA 2284560

An injection molding machine (10) for molding plastic parts by injecting a molten plastic through a plurality of valve gates (31) into a mold cavity by reciprocation of a helical screw (16). A linear position sensor (34) positioned on the machine to detect the position of the helical screw (16) and control the opening and closing of the gates (31) based on the detected position of the screw (16). A computer is in communication with the valve gates and the position sensor to monitor the position and activate the opening and closing of the valve gates (31). A pressure transducer is associated with the mold cavity and in communication with the computer (32) as an alternate or additional method for controlling the opening and closing of the valve gates (31).

L'invention porte sur une machine de moulage par injection (10) servant à mouler des pièces en injectant du plastique fondu par une série de canaux obturables (31) dans la cavité d'un moule à l'aide d'une vis hélicoïdale (16) animée d'un mouvement alternatif. L'invention porte également: sur un détecteur (34) placé sur la machine et détectant la position linéaire de la vis (16), sur un ordinateur communicant avec les canaux obturables et le détecteur de position et suivant la susdite position et commandant en fonction l'ouverture et la fermeture des canaux (31), sur un transducteur de pression associé à la cavité du moule et communicant avec l'ordinateur (32) et constituant une solution concurrente pour commander l'ouverture ou la fermeture des canaux (31).

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