In-line valve gated nozzle

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/20 (2006.01) B29C 45/23 (2006.01)

Patent

CA 2449907

A nozzle is provided for an injection molding apparatus. The injection molding apparatus includes a mold block. The mold block defines at least one mold cavity that has a gate. The nozzle includes a nozzle body, a valve pin, an actuator, a first heating element and a second heating element. The nozzle body defines a nozzle body melt channel that is in fluid communication with and downstream from a melt source and that is in fluid communication with and upstream from the gate. The valve pin includes an upstream portion that defines a valve pin melt channel, wherein the valve pin melt channel has an inlet and at least one outlet. The inlet and the at least one outlet are in fluid communication with the nozzle body melt channel. The valve pin further includes a tip piece connected to the upstream portion. The valve pin is movable in the nozzle body melt channel for controlling the melt flow through the gate. The actuator is operatively connected to the valve pin to move the valve pin between the open and closed positions. The first heating element is thermally connected to the upstream portion of the valve pin. The second heating element is thermally connected to the nozzle body.

Une buse est fournie pour un moule à injection. Ce moule à injection comprend un bloc de moulage. Ce bloc de moulage détermine au moins une cavité de moule pourvue d'une tête d'extrudeuse. La buse comprend un corps de buse, un pointeau de soupape, un actionneur, un premier élément chauffant et un second élément chauffant. Le corps de la buse détermine un canal de fusion en communication fluide avec une source de fusion et en aval de cette source, et ce corps de buse est en communication fluide avec la tête extrudeuse et en amont cette tête extrudeuse. Le pointeau de soupape comprend une partie en amont qui détermine un canal de fusion où ledit canal de fusion présente un entonnoir de coulée et au moins un orifice de sortie. L'entonnoir de coulée et l'orifice de sortie minimal sont en communication fluide avec le canal de fusion du corps de buse. Le pointeau de soupape comprend de plus un embout raccordé à la partie en amont. Le pointeau de soupape peut se déplacer dans le canal de fusion du corps de buse pour réguler le débit de la matière en fusion à travers la tête extrudeuse. L'actionneur est raccordé fonctionnellement au pointeau de soupape, pour passer de la position ouverte à la position fermée. Le premier élément chauffant est raccordé par dilatation thermique à la partie en amont du pointeau de soupape. Le second élément chauffant est raccordé par dilatation thermique au corps de la buse.

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