Injection molding valve gated hot runner nozzle
AssigneeMold-Masters (2007) Limited
InventorsPeter Klobucar, Denis Babin, Bruce Catoen, Scott Gammon
Life of this patent
Estimating the term…
Abstract
A valve gated hot runner nozzle with at least two transition members made of different materials located between a nozzle tip and a mold gate component to provide a thermal transition region. A first transition member in contact with the nozzle tip is less thermally conductive than a second transition member in contact with the mold gate component. The valve pin when in the closed position makes sealing contact with at least the second transition member such that cooling from the mold gate component is transferred to the valve pin to cool the melt in the mold gate area.
Claims20
An injection molding apparatus comprising:
- an injection molding nozzle having a heater and a melt channel for receiving melt from a melt source;
- a nozzle tip coupled to a downstream end of the nozzle, the nozzle tip having a melt channel for receiving melt from the nozzle melt channel;
- a cooled mold gate component having a mold gate which is in fluid communication with the nozzle tip melt channel for transferring melt from the nozzle to a mold cavity;
- a valve pin longitudinally extending within the melt channels of the nozzle and nozzle tip, the valve pin being selectively actuated between an open position that allows melt flow through the mold gate into the mold cavity and a closed position that blocks melt flow from entering the mold gate and the mold cavity;
- a first transition member having a melt channel, the first transition member being in contact with a downstream end of the nozzle tip;
- and
- a second transition member having a melt channel, the second transition member being positioned downstream of the first transition member in contact with an upstream surface of the mold gate component,
- wherein the first transition member and the mold gate component are made from materials which are less thermally conductive than a material of the second transition member, and wherein in the closed position an end portion of the valve pin makes contact with the second transition member.
An injection molding apparatus comprising:
- an injection molding nozzle having a heater and a melt channel for receiving melt from a melt source;
- a nozzle tip coupled to a downstream end of the nozzle, the nozzle tip having a melt channel for receiving melt from the nozzle melt channel;
- a cooled mold gate component having a mold gate which is in fluid communication with the nozzle tip melt channel for transferring melt from the nozzle to a mold cavity;
- a valve pin longitudinally extending within the melt channels of the nozzle and nozzle tip, the valve pin being selectively actuated between an open position that allows melt flow through the mold gate into the mold cavity and a closed position that blocks melt flow from entering the mold gate and the mold cavity;
- a first transition member having a melt channel, the first transition member being in contact with a downstream end of the nozzle tip;
- and
- a second transition member having a melt channel, the second transition member being positioned downstream of the first transition member in contact with an upstream surface of the mold gate component,
- wherein the nozzle tip, the first transition member and the second transition member are attached to each other,
- wherein the first transition member and the mold gate component are made from materials which are less thermally conductive than a material of the second transition member, and
- wherein in the closed position an end portion of the valve pin makes contact with the second transition member.
Dependencies are inferred from the claim text.