Injection molding nozzle for plastic with at least two...

Details Injection molding nozzle for plastic with at least two... Injection molding nozzle for plastic with at least two...

B - Operations, Transporting

29

C

B29C 45/20 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01)

Patent

CA 2434420

An injection molding nozzle (1) for plastic with at least two outlet open- ings (2) facing toward different sides and directed oppositely is not con- structed as an open injection molding nozzle but has a respective closure needle (5) in the outlet openings (2), and a drive is also provided for displac- ing the closure needles (5) at least into the closing position. Thus a cold plug at the end of the outlet openings (2) facing a mold (3) can be avoided, independently of whether the closure needles completely close these outlet openings (2) at their mouth (6) or still leave a minimum gap.

Une buse (1) pour moulage par injection de plastique comportant au moins deux orifices (2) dirigés vers des côtés différents et directement opposés, n'est pas construite comme une buse de moulage ouverte, mais comporte une aiguille d'obturation respective (5) dans chaque orifice d'injection (2), et un mécanisme de commande conçu pour déplacer les aiguilles d'obturation (5), au moins vers leur position d'obturation. Cette disposition permet d'éviter la formation de bouchons de matière refroidie aux extrémités des orifices d'injection (2) qui sont face à un moule (3), indépendamment du fait que les aiguilles obturent complètement les trous de sortie (6) des orifices (2) ou qu'il reste un passage minimal.

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