Valve gating apparatus and method for injection molding

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/28 (2006.01) B29C 45/16 (2006.01)

Patent

CA 2336683

A valve gating apparatus and method for injection molding includes at least one shutter disposed between the gate and the cavity melt channel into a mold cavity. The shutter is moved laterally, between a closed position wherein flow of melt from the nozzle into the cavity is inhibited, and an open position wherein flow of melt into the cavity is unimpeded by the shutter. Intermediate these two positions, the shutter can be employed to reduce the cross-sectional area of the gate to throttle the gate. Embodiments are disclosed wherein one shutter or pairs of shutters are employed to gate the gate. Further, when pairs of shutters are employed, the shutters can abut each other in the close position or can overlie each other. This novel design prevents generation of waste material and eliminates the need to have means for removing cold plugs.

L'invention concerne un dispositif d'entrée à obturateur et un procédé de moulage par injection. Le dispositif comprend au moins un obturateur disposé entre l'entrée et le canal de matière fondue aboutissant à la cavité du moule. L'obturateur se déplace latéralement entre une position fermée, dans laquelle le passage de la matière fondue de la buse à la cavité est empêché, et une position ouverte, dans laquelle ledit passage n'est pas entravé par l'obturateur. Entre ces deux positions, on peut employer l'obturateur pour réduire la section de l'entrée afin de la réguler par étranglement. Dans certains modes de réalisation, on utilise un seul obturateur ou une paire d'obturateurs pour attaquer l'entrée. Quand on utilise des paires d'obturateurs, ceux-ci, en position fermée, peuvent buter l'un contre l'autre ou se superposer. Cette nouvelle conception empêche la formation de déchets et évite d'avoir recours à un dispositif permettant d'éliminer les bouchons froids.

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