IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0499211
(2009-07-08)
|
등록번호 |
US-7766647
(2010-08-24)
|
발명자
/ 주소 |
- Dewar, Neil
- Kudchadkar, Vijay
- Klobucar, Peter
|
출원인 / 주소 |
- Mold-Masters (2007) Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
36 |
초록
▼
An injection molding system is disclosed having a self-regulating valve for balancing melt flow. The self-regulating valve includes a control rod configured to balance the melt flow rate through a hot runner system. The self-regulating valve reacts to an injection or melt pressure within the hot run
An injection molding system is disclosed having a self-regulating valve for balancing melt flow. The self-regulating valve includes a control rod configured to balance the melt flow rate through a hot runner system. The self-regulating valve reacts to an injection or melt pressure within the hot runner system and a pre-set force provided by an external force device. The self-regulating valve is an open-loop system as it requires neither a measurement of pressure by a sensor nor feedback from a processor in order to regulate the melt flow. The self-regulating valve mechanically reacts to changes in melt pressure on control surfaces thereof by “bobbing” upwards/downwards to decrease/increase the melt flow accordingly. The self-regulating valve compensates for conditions that affect melt pressure, such as an increase/decrease in melt viscosity, changes in melt temperature, and/or mold cavity size without the use of a processing device.
대표청구항
▼
What is claimed is: 1. An injection molding apparatus, comprising: a manifold defining a manifold melt channel, the manifold being configured to receive melt from a melt source; a nozzle coupled to the manifold, wherein the nozzle defines a nozzle melt channel that is in fluid communication with th
What is claimed is: 1. An injection molding apparatus, comprising: a manifold defining a manifold melt channel, the manifold being configured to receive melt from a melt source; a nozzle coupled to the manifold, wherein the nozzle defines a nozzle melt channel that is in fluid communication with the manifold melt channel; a self-regulating valve having a control rod partially positioned and slidable within the manifold melt channel at a location where the manifold melt channel has a 90° turn towards the nozzle, the control rod including an upstream end, an opening that extends through the control rod, and a tip pressure surface at a downstream end; and an external force device coupled to the upstream end of the control rod, wherein the self-regulating valve is configured to regulate melt flowing from the manifold melt channel through the control rod opening to the nozzle melt channel in response to an axial force exerted by the external force device on the upstream end of the control rod and a fluid pressure exerted by the melt on the tip pressure surface at the downstream end of the control rod. 2. The injection molding apparatus of claim 1, wherein the external force device is one of a hydraulic actuator, a pneumatic actuator, a weight and a spring. 3. The injection molding apparatus of claim 1, wherein the control rod slides in a direction to reduce melt flow through the control rod opening when the fluid pressure on the tip pressure surface of the control rod is greater than the axial force exerted by the external force device on the upstream end of the control rod. 4. The injection molding apparatus of claim 3, wherein the control rod slides in a direction to increase melt flow through the control rod opening when the fluid pressure on the tip pressure surface of the control rod is less than the axial force exerted by the external force device on the upstream end of the control rod. 5. The injection molding apparatus of claim 1, wherein the control rod opening includes an upper pressure surface at an upper surface of the opening and a lower pressure surface at a lower surface of the opening, wherein the upper pressure surface has a projected surface area equal to a projected surface area of the lower pressure surface. 6. The injection molding apparatus of claim 1, wherein the control rod opening includes an upper pressure surface at an upper surface of the opening and a lower pressure surface at a lower surface of the opening, wherein the upper pressure surface has a projected surface area that differs from a projected surface area of the lower pressure surface. 7. The injection molding apparatus of claim 1, wherein the control rod includes a valve pin that extends from a downstream end thereof such that the valve pin seats and unseats within a mold gate to open and close the mold gate. 8. The injection molding apparatus of claim 7, wherein a diameter of the control rod is larger than a diameter of the valve pin. 9. The injection molding apparatus of claim 8, wherein a diameter of the control rod and a diameter of the valve pin have a ratio of about 5:2. 10. The injection molding apparatus of claim 1, wherein the external force device applies a constant axial force on the control rod. 11. The injection molding apparatus of claim 1, wherein the external force device applies a variable axial force on the control rod. 12. A self-regulating valve for use in a melt channel of an injection molding apparatus comprising: a control rod that includes an upstream end, an opening extending through the control rod sized to permit a melt stream of moldable material to flow therethrough, and a tip pressure surface at a downstream end; and an external force device coupled to the upstream end of the control rod, wherein the self-regulating valve is configured to regulate the melt flowing from the melt channel through the control rod opening in response to an axial force exerted by the external force device on the upstream end of the control rod and a fluid pressure exerted by the melt stream on the tip pressure surface on the downstream end of the control rod. 13. The self-regulating valve of claim 12, wherein the control rod slides in a direction to reduce the melt flowing from the melt channel through the control rod opening when the fluid pressure on the tip pressure surface of the control rod is greater than the axial force exerted by the external force device. 14. The self-regulating valve of claim 13, wherein the control rod slides in a direction to increase melt flowing from the melt channel through the control rod opening when the fluid pressure on the tip pressure surface of the control rod is less than the axial force exerted by the external force device. 15. The self-regulating valve of claim 12, wherein the control rod opening includes a rectangular cross section. 16. The self-regulating valve of claim 12, wherein the control rod opening is tapered such that the cross-section of the opening is larger toward an outer surface of the control rod. 17. The self-regulating valve of claim 12, wherein the external force device is one of a hydraulic actuator, a pneumatic actuator, a weight and a spring. 18. The self-regulating valve of claim 12, wherein the control rod opening includes an upper pressure surface at an upper end of the opening and a lower pressure surface at a lower end of the opening wherein the upper pressure surface has a projected surface area equal to a projected surface area of the lower pressure surface. 19. The self-regulating valve of claim 12, wherein the control rod opening includes an upper pressure surface at an upper end of the opening and a lower pressure surface at a lower end of the opening wherein the upper pressure surface has a projected surface area that differs from a projected surface area of the lower pressure surface. 20. The self-regulating valve of claim 12, wherein the external force device applies a constant axial force on the control rod. 21. The self-regulating valve of claim 12, wherein the external force device applies a variable axial force on the control rod.
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