IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0347137
(2006-02-03)
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등록번호 |
US-7407380
(2008-08-05)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Mold Masters (2007) Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
13 |
초록
▼
An injection molding apparatus includes a manifold having a manifold channel for receiving a melt stream from a source. A nozzle having a nozzle channel receives the melt stream from the manifold channel and delivers the melt stream to a mold cavity through a mold gate. A valve pin bushing is provid
An injection molding apparatus includes a manifold having a manifold channel for receiving a melt stream from a source. A nozzle having a nozzle channel receives the melt stream from the manifold channel and delivers the melt stream to a mold cavity through a mold gate. A valve pin bushing is provided between the manifold and the nozzle and includes a bore for receiving a valve pin. A chamber is provided in said valve pin bushing and communicates with the bore. An inlet channel extends between an inlet, which is located in an outer surface of the valve pin bushing, and the chamber. A vent channel extends between the chamber and an outlet, which is located in the outer surface of the valve pin bushing. A forced fluid source communicates with the inlet channel to force fluid through the inlet channel, said chamber and the vent channel.
대표청구항
▼
What is claimed is: 1. An injection molding apparatus comprising: a manifold for receiving a melt stream from a source; a nozzle having a nozzle channel for receiving the melt stream from said manifold; a mold cavity in communication with said nozzle channel for receiving melt through a mold gate;
What is claimed is: 1. An injection molding apparatus comprising: a manifold for receiving a melt stream from a source; a nozzle having a nozzle channel for receiving the melt stream from said manifold; a mold cavity in communication with said nozzle channel for receiving melt through a mold gate; a valve pin extending through said nozzle channel for selectively opening said mold gate; a valve pin bushing provided between said manifold and said nozzle, said valve pin bushing having a bore for slidably receiving said valve pin; a chamber provided in said valve pin bushing, said chamber being in communication with said valve pin bore; an inlet channel provided in said valve pin bushing, said inlet channel extending between an inlet located in an outer surface of said valve pin bushing and said chamber; and a vent channel provided in said valve pin bushing, said vent channel extending between said chamber and an outlet located in said outer surface of said valve pin bushing. 2. The injection molding apparatus of claim 1 further comprising: a forced fluid source in communication with said valve pin bushing inlet channel to force fluid through said inlet channel, said chamber and said vent channel. 3. The injection molding apparatus of claim 2, wherein said forced fluid source is a forced air source. 4. The injection molding apparatus of claim 3, wherein said inlet channel, said vent channel, and said forced air source provide a continuous forced air circuit. 5. The injection molding apparatus of claim 4, wherein a filter is located between said vent channel and said forced air source to remove foreign particles from the air. 6. The injection molding apparatus of claim 5, wherein said forced air circuit further includes a pressure sensor for indicating a blockage in said forced air circuit. 7. The injection molding apparatus of claim 3, further comprising: a first pipe extending between said forced air source and said valve pin bushing inlet channel; and a second pipe extending between said valve pin bushing vent channel and said forced air source, said filter being provided in said second pipe. 8. The injection molding apparatus of claim 7, wherein said pressure sensor is located in said first pipe. 9. The injection molding apparatus of claim 4, wherein said forced air circuit further includes a temperature sensor. 10. The injection molding apparatus of claim 1, wherein melt is located in said chamber of said valve pin bushing. 11. The injection molding apparatus of claim 10, wherein said chamber is a groove in a wall of said valve pin bushing bore. 12. The injection molding apparatus of claim 3, wherein said forced air source clears said valve pin bushing inlet channel, chamber and vent channel of gases escaping from the melt stream. 13. An injection molding apparatus comprising: a manifold for receiving a melt stream from a source; a nozzle having a nozzle channel for receiving the melt stream from said manifold; a mold cavity in communication with said nozzle channel for receiving melt through a mold gate; a valve pin extending through said nozzle channel for selectively opening said mold gate; a valve pin bushing provided on an opposite side of said manifold from said nozzle, said valve pin bushing having a bore for slidably receiving said valve pin; a chamber provided in said valve pin bushing, said chamber being in communication with said valve pin bore; a first channel provided in said valve pin bushing, said first channel extending between an outer surface of said valve pin bushing and said chamber; a second channel provided in said valve pin bushing, said second channel extending between said chamber and said outer surface of said valve pin bushing; and a forced fluid source in communication with said first channel of said valve pin bushing to force fluid through said first channel, said chamber, and said second channel. 14. The injection molding apparatus of claim 13, wherein said forced fluid source is a forced air source. 15. The injection molding apparatus of claim 13, wherein said first channel, said second channel, and said forced fluid source provide a continuous forced fluid circuit. 16. The injection molding apparatus of claim 15, wherein a filter is located between said second channel and said forced fluid source to remove foreign particles from the fluid. 17. The injection molding apparatus of claim 15, wherein said forced fluid circuit further includes a temperature sensor. 18. The injection molding apparatus of claim 13, further comprising: a pressure sensor for indicating a blockage in said valve pin bushing. 19. The injection molding apparatus of claim 13, further comprising: a first pipe extending between said forced fluid source and said first channel of said valve pin bushing; and a second pipe extending between said second channel of said valve pin bushing and said forced fluid source. 20. The injection molding apparatus of claim 19, wherein a pressure sensor is located in said first pipe. 21. The injection molding apparatus of claim 19, wherein a filter is located in said second pipe. 22. The injection molding apparatus of claim 13, wherein said chamber is a groove in a wall of said bore of said valve pin bushing. 23. The injection molding apparatus of claim 13, wherein said forced fluid source clears said first channel, said chamber, and said second channel of gases escaping from the melt stream. 24. The injection molding apparatus of claim 13, wherein said valve pin bushing is positioned between said manifold and a back plate. 25. The injection molding apparatus of claim 13, further comprising: a filter coupled to an outlet of said second channel. 26. The injection molding apparatus of claim 13, wherein the locations of said first channel and said second channel allow fluid to be forced through said chamber tangential to said valve pin. 27. The injection molding apparatus of claim 1, further comprising: a filter coupled to the outlet of said vent channel.
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