Improved hot runner valve gate piston assembly

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/28 (2006.01)

Patent

CA 2402863

Improved hot runner valve gate piston apparatus and method includes structure and steps whereby the air piston cylinder wall (25) transmits less than all of the compressive force between the backplate (18) and the manifold. Preferably, a backup pad (16) also transmits heat from the backplate (18) to the manifold (1), reducing the temperature of the cylinder wall (25). A flex member is preferably provided adjacent to or integral with the cylinder (25) for absorbing some of the compressive forces between the backplate (18) and the manifold (1), and in order to maintain the air seal between the piston cylinder (25) in the air channel in the hot runner backplate. Image

Un appareil amélioré de piston pour l'obturateur d'un canal d'alimentation chauffé et un procédé associé comprennent une structure et des niveaux réalisés de sorte que la paroi (25) de cylindre du piston transmette moins de la totalité de la force de compression entre la plaque arrière (18) et le collecteur. De préférence, un tampon supplémentaire (16) transmet la chaleur entre la plaque arrière (18) et le collecteur (1), ce qui réduit la température de la paroi (25) du cylindre. Un élément souple est de préférence prévu juste à côté du cylindre (25) ou formé monobloc avec ce dernier pour absorber une partie des forces de compression entre la plaque arrière (18) et le collecteur (1) afin de maintenir le joint étanche à l'air entre le cylindre (25) du piston situé dans le passage pour l'air prévu dans la plaque arrière du canal d'alimentation chauffé.

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