IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0142915
(2005-06-02)
|
등록번호 |
US-7364425
(2008-04-29)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Mold Masters (2007) Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
30 |
초록
▼
A valve-gated nozzle in an injection molding machine allows for smooth, blended melt flow into a mold cavity. In one example, this is accomplished through use of a valve-gated nozzle having a nozzle body with a nozzle melt channel in fluid communication with a manifold melt channel and a nozzle tip.
A valve-gated nozzle in an injection molding machine allows for smooth, blended melt flow into a mold cavity. In one example, this is accomplished through use of a valve-gated nozzle having a nozzle body with a nozzle melt channel in fluid communication with a manifold melt channel and a nozzle tip. The nozzle tip includes a first melt channel in fluid communication with the nozzle melt channel and a plurality of release melt channels between the first melt channel and an annular melt channel. The annular melt channel is formed between a retaining device and the nozzle tip. The annular melt channel includes a decompression chamber in fluid communication with respective ones of the release melt channels and a compression chamber between the decompression chamber and a mold. A pressure difference formed between the respective release melt channels and the decompression chamber and between the decompression chamber and the compression chamber blends the molten material to even and balance flow into the mold cavity.
대표청구항
▼
What is claimed is: 1. A nozzle for an injection molding apparatus, comprising: a nozzle body having a nozzle melt channel with a nozzle axis; a nozzle tip, including, a first melt channel in fluid communication with the nozzle melt channel, the first melt channel having a first melt channel axis,
What is claimed is: 1. A nozzle for an injection molding apparatus, comprising: a nozzle body having a nozzle melt channel with a nozzle axis; a nozzle tip, including, a first melt channel in fluid communication with the nozzle melt channel, the first melt channel having a first melt channel axis, and a second melt channel in fluid communication with the first melt channel and having a second melt channel axis that is at an angle with respect to the first melt channel axis; a retaining device that positions the nozzle tip with respect to the nozzle body; an annular melt channel formed between the nozzle tip and the retaining device; and a valve gating element that moves along the longitudinal axes of the nozzle body and in the first melt channel to selectively open a mold gate. 2. The nozzle of claim 1, wherein there are two or more of the nozzle tip second melt channels. 3. The nozzle of claim 1, wherein there are between three and six of the nozzle tip second melt channels. 4. The nozzle of claim 1, wherein a first portion of the annular melt channel comprises a decompression chamber. 5. The nozzle of claim 4, wherein a second portion of the annular melt channel comprises a melt compression chamber. 6. The nozzle of claim 5, wherein the second portion of the annular melt channel comprises a compression chamber adjacent the decompression chamber. 7. The nozzle of claim 1, wherein an area between the nozzle tip and a mold gate is devoid of a bubble area. 8. The nozzle of claim 1, wherein the nozzle tip is made from a material that is more thermally conductive then said retaining device. 9. The nozzle of claim 8, wherein the nozzle tip comprises one of a copper alloy or a steel. 10. The nozzle of claim 8, wherein the retaining device is made from at least one of steel, titanium alloy, and ceramic. 11. The nozzle of claim 1, wherein the retaining device comprises: a retaining portion that positions the nozzle tip with respect to the nozzle body; and a sealing portion that insulates the nozzle tip from a mold plate. 12. The nozzle of claim 11, wherein the sealing portion touches the mold plate. 13. The nozzle of claim 1, wherein the second melt channel axis is substantially normal with respect to the first melt channel axis. 14. The nozzle of claim 1, wherein the annular melt channel comprises: a first portion having a first diameter and being in fluid communication with the nozzle tip second melt channel, and a second portion having a second diameter and being in fluid communication with the first portion of the annular melt channel and with a mold cavity, wherein the second diameter is smaller than the first diameter. 15. The nozzle of claim 1, wherein the nozzle tip frirther comprises: a valve pin alignment bore that continuously guides the valve gating element. 16. The nozzle of claim 15, wherein the valve gating element substantially prevents the melt from exiting the first melt channel into the valve pin alignment bore. 17. The nozzle of claim 15, wherein the inside surface of the valve pin alignment bore comprises a wear resistant coating. 18. A nozzle in an injection molding apparatus, comprising: a nozzle body having a nozzle melt channel, the nozzle melt channel having a longitudinal axis; a nozzle seal, including, a first piece that is a nozzle tip; a second piece that is a sealing device, such that the sealing device insulates the nozzle from a mold cavity; an annular melt channel formed between the first and second pieces, such that melt flows through the annular melt channel before entering the mold cavity; an exit channel having a longitudinal axis that is normal with respect to the longitudinal axis of the first piece and that extends between the first piece and the annular melt channel; a decompression chamber in fluid communication with the exit channel; a compression chamber in fluid communication with the decompression chamber; and a valve gating element that moves along the longitudinal axes of the nozzle body and the second piece to selectively open a gate. 19. The nozzle of claim 18, wherein the first piece includes a first melt channel having a longitudinal axis and a valve pin alignment bore. 20. The nozzle of claim 19, wherein the valve gating element prevents the melt from exiting the second piece. 21. A nozzle for an injection molding apparatus, comprising: a nozzle body and nozzle tip defining a nozzle melt channel having a longitudinal axis, the nozzle tip defining a release melt channel extending from the nozzle melt channel at an angle to the longitudinal axis; an annular wall secured to the nozzle body and extending around at least a portion of the nozzle tip, the annular wall and nozzle tip defining therebetween an annular melt channel for transmitting melt flow from the release melt channel towards a mold gate, the annular melt channel including a first annular portion in flow communication with the release melt channel and a second annular portion downstream from the first annular portion, the first and second annular portions being respectfully dimensioned such that the first annular portion forms a decompression chamber for melt flowing therethrough and the second annular portion forms a compression chamber for melt flowing therethrough; and a valve gating element that moves along the longitudinal axis in the nozzle melt channel to selectively open a mold gate. 22. The nozzle of claim 21 wherein the release melt channel has a radially directed discharge opening in a circumferential outer surface of the nozzle tip, and the first annular portion of the annular melt channel extends circumferentially around the nozzle tip such that the release melt channel discharges melt flow radially into the first annular portion relative to the longitudinal axis. 23. The nozzle of claim 22 wherein the release melt channel extends substantially normal to the longitudinal axis. 24. The nozzle of claim 23 wherein the nozzle tip defines a further release melt channel transmitting melt flow from the nozzle melt channel to the first annular portion, the release melt channel and the further release melt channel having discharge openings longitudinally offset from each other relative to the longitudinal axis. 25. The nozzle of claim 23 wherein the nozzle tip defines a plurality of the release melt channels for transmitting melt flow from the nozzle melt channel to the first annular portion of the annular melt channel, at least some of the release melt channels having discharge openings into the first annular portion at locations downstream from discharge openings of others of the release melt channels. 26. The nozzle of claim 25 wherein a cross-sectional flow area of the first annular portion is greater than that of the second annular portion. 27. The nozzle of claim 26 wherein an outer surface portion of the nozzle tip that defines an inner boundary of the first annular portion has a diameter that is less than a diameter of an outer surface portion of the nozzle tip that defines an inner boundary of the second annular portion. 28. The nozzle of claim 27 wherein the annular wall comprises a sealing device that seals the nozzle tip with respect to a mold cavity. 29. The nozzle of claim 28 wherein the sealing device insulates the nozzle tip from a mold plate. 30. The nozzle of claim 21 wherein the nozzle tip comprises a first section made from a thermally conductive material and a second section made from a wear resistant material. 31. A nozzle for an injection molding apparatus, comprising: a nozzle body having a nozzle melt channel with a longitudinal axis; a nozzle tip, including, a first melt channel in fluid communication with the nozzle melt channel, the first melt channel having a first melt channel longitudinal axis, and a second melt channel in fluid communication with the first melt channel and having a second melt channel longitudinal axis that is substantially normal with respect to the first melt channel longitudinal axis; an annular wall extending around the nozzle tip; an annular melt channel formed between the nozzle tip and the annular wall; a valve gating element that moves along the longitudinal axis of the nozzle body and in the first melt channel to selectively open a mold gate; and where said annular melt channel includes a first and second portion where said first portion is a decompression chamber and said second portion is a compression chamber and said compression chamber is adjacent the decompression chamber. 32. The nozzle of claim 31 wherein the annular wall is a retaining device that positions the nozzle tip with respect to the nozzle body. 33. The nozzle of claim 31 wherein the annular wall is a sealing device that seals the nozzle tip with respect to a mold cavity. 34. The nozzle of claim 31, wherein there are between three and six of the nozzle tip second melt channels. 35. The nozzle of claim 33, wherein the sealing device touches a mold plate. 36. The nozzle of claim 18 wherein said sealing device further comprises a retaining portion, and said retaining portion retains said nozzle tip with respect to the nozzle body. 37. The nozzle of claim 19 wherein said valve gating element moves along said channel of the first piece to selectively open and close said gate. 38. The nozzle of claim 36, wherein the sealing device touches a mold cavity plate. 39. The nozzle of claim 28 wherein the annular wall comprises a retaining device that positions the nozzle tip with respect to the nozzle body.
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