Edge gated injection molding apparatus
AssigneeMold-Masters (2007) Limited
InventorNeil Dewar
Life of this patent
Estimating the term…
Abstract
An edge gated injection molding apparatus includes a manifold having a manifold channel for receiving a melt stream of moldable material under pressure. A nozzle is coupled to the manifold and a nozzle melt channel of the nozzle receives the melt stream from the manifold channel. A mold cavity communicates with the nozzle melt channel of the nozzle and receives melt through a mold gate. The mold gate is located at an edge of the mold cavity. A chamber receives melt from the nozzle channel and communicates with the mold cavity through the mold gate. A portion of the chamber is located forward of the mold gate. A valve pin is slidable through the nozzle channel from a first position in which the mold gate is open to a second position in which an outer side surface of the valve pin blocks the mold gate.
Claims15
An injection molding apparatus comprising:
- a manifold having a manifold channel for receiving a melt stream of moldable material under pressure;
- a nozzle coupled to the manifold and having a nozzle melt channel for receiving the melt stream from the manifold channel;
- a mold cavity in fluid communication with the nozzle melt channel for receiving the melt stream through a mold gate, the mold gate being located along an edge of the mold cavity;
- a recess for receiving the melt stream from the nozzle channel and for fluidly communicating the melt stream to the mold cavity through the mold gate, the recess having a forward portion that at least partially extends forward of the mold gate;
- and
- a valve pin having a tip portion, wherein the valve pin is slidable within the nozzle channel from a retracted position in which the mold gate is open and the valve pin tip portion is unseated from the recess forward portion to an extended position in which an outer side surface of the valve pin blocks the mold gate and the valve pin tip portion is seated in the recess forward portion.
An injection molding apparatus comprising:
- a manifold having a manifold channel for receiving a melt stream of moldable material under pressure;
- a nozzle coupled to the manifold and having a nozzle melt channel for receiving the melt stream from the manifold channel;
- a mold cavity in fluid communication with the nozzle melt channel for receiving the melt stream through a mold gate, the mold gate being located along an edge of the mold cavity;
- and
- a valve pin having a reduced outer diameter portion having a first diameter and a tip having a second diameter larger than the first diameter, wherein the valve pin is slidable within the nozzle channel from a retracted position in which a side surface of the valve pin tip closes the mold gate to an extended open position in which the reduced outer diameter portion of the valve pin is disposed adjacent said mold gate to fluidly communicate the melt stream from the nozzle melt channel to the mold gate, such that at least a portion of the valve pin tip is seated within a chamber located forward of the mold gate.
An injection molding apparatus comprising:
- a manifold having a manifold channel for receiving a melt stream of moldable material under pressure;
- a nozzle coupled to the manifold and having a nozzle melt channel for receiving the melt stream from the manifold channel;
- a mold cavity in fluid communication with the nozzle melt channel for receiving the melt stream;
- and
- a valve pin slidable within the nozzle channel from a retracted open position to an extended closed position, wherein the valve pin includes a tip portion having a forward most surface and an adjacent side surface that forms a portion of the mold cavity when the valve pin is in the extended closed position, and wherein the melt stream flows downstream of the forward most surface of the tip portion of the valve pin when the valve pin is in the retracted open position.
Dependencies are inferred from the claim text.