IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0797847
(2007-05-08)
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등록번호 |
US-7666335
(2010-04-09)
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발명자
/ 주소 |
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출원인 / 주소 |
- Beaumont Technologies, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
Methods and apparatus control the direction and/or magnitude of warpage in formed plastic parts through strategic repositioning of the non-homogeneous melt conditions across the stream of a laminar flowing fluid flowing through a flow channel to a desirable state. This may be used in combination wit
Methods and apparatus control the direction and/or magnitude of warpage in formed plastic parts through strategic repositioning of the non-homogeneous melt conditions across the stream of a laminar flowing fluid flowing through a flow channel to a desirable state. This may be used in combination with more conventional process variables, such as control of material temperature, pack pressure, and pack time. The invention is particularly useful in any solidifying or non-solidifying runner, or flow channel used to make products from laminar flowing fluids. The runner may be a cold-runner or hot-runner system that flow a stream of laminar flowing material, such as thermosetting or thermoplastic plastic (melt) through at least one runner flowing a non-homogeneous melt, and extruded or packed into a single or multiple-cavity mold. The repositioning is achieved by the use of one or more fluid rotation devices, which can be of fixed or adjustable types, strategically positioned in the flow channel of the runner system to affect a desirable change in warpage as a result of the melt condition repositioning.
대표청구항
▼
What is claimed is: 1. A method of repositioning of a non-homogeneous melt condition which occur in a direction across the flow path of laminates of a stream of laminar flowing material in a runner of a mold to control at least one of the direction and magnitude of warpage in plastic molded parts,
What is claimed is: 1. A method of repositioning of a non-homogeneous melt condition which occur in a direction across the flow path of laminates of a stream of laminar flowing material in a runner of a mold to control at least one of the direction and magnitude of warpage in plastic molded parts, comprising: determining an undesirable warpage condition in a plastic part to be formed in a mold having a defined runner system that delivers a stream of laminar flowing, non-homogeneous material to at least one mold cavity; controlling the non-homogeneous melt conditions within the runner by strategically positioning a melt rotation device in the runner to control direction and magnitude of warpage in resultant plastic parts molded in the at least one mold cavity; and adjustment of at least one molding process variable to assist in control of the warpage direction and/or magnitude. 2. The method according to claim 1, wherein the controlling is by a melt rotation device of the fixed type that achieves a desired rotation of the non-homogeneous melt conditions to achieve a desired control of warpage. 3. The method according to claim 2, wherein the fixed type melt rotation device achieves an asymmetric melt condition. 4. The method according to claim 2, wherein the fixed type melt rotation device achieves a generally symmetrical melt condition. 5. The method according to claim 1, wherein the controlling is by a melt rotation device of the adjustable type that achieves a desired rotation of the non-homogeneous melt conditions to achieve a desired control of warpage. 6. The method according to claim 5, wherein the adjustable type melt rotation device achieves an asymmetric melt condition. 7. The method according to claim 5, wherein the adjustable type melt rotation device achieves a generally symmetrical melt condition. 8. The method according to claim 1, wherein the warpage direction control is achieved by the melt rotation device and warpage magnitude control is achieved by the adjustment of at least one molding process variable. 9. The method according to claim 1, wherein the process variable is selected from the group of material temperature, pack pressure, flow rate and pack time. 10. The method according to claim 1, wherein the method is performed in a cold runner mold. 11. The method according to claim 1, wherein the plastic part is a thermosetting or thermoplastic part. 12. A method of repositioning of a non-homogeneous melt condition which occur in a direction across the flow path of laminates of a stream of laminar flowing material in a runner of a part forming system to control at least one of the direction and magnitude of warpage in formed plastic parts, comprising: determining an undesirable warpage condition in a plastic part to be formed in a part forming system having a defined runner system that delivers a stream of laminar flowing, non-homogeneous material through a flow channel during formation of the plastic part; and controlling the non-homogeneous melt conditions within the runner by strategically positioning a melt rotation device in the flow channel to control direction and magnitude of warpage in resultant formed plastic parts; and adjustment of at least one molding process variable to assist in control of the warpage direction and/or magnitude. 13. The method according to claim 12, wherein the warpage direction control is achieved by the melt rotation device and the warpage magnitude control is achieved by the adjustment of the at least one molding process variable. 14. A mold including a melt rotation device for controlling non-homogeneous melt conditions which occur in a direction across the flow path of laminates of a stream of laminar flowing material flowing through a flow channel to control the direction and/or magnitude of warpage in molded plastic parts, comprising: a mold body having at least one mold cavity and at least one branching runner through which a stream of laminar flowing material flows to fill the at least one mold cavity; and at least one melt rotation device located downstream of a last branch in at least a portion of the runner in which the non-homogeneous conditions occur across the stream of laminar flowing material, the melt rotation device being strategically positioned in the flow channel defined by the at least one runner to individually control the position of the non-homogeneous melt conditions and control warpage direction and magnitude of at least one individual plastic molded part resulting from the filling of an individual one of the at least one mold cavity downstream from the at least one melt rotation device. 15. The mold according to claim 14, wherein the melt rotation device is of the fixed type and achieves a desired rotation of the non-homogeneous melt conditions to achieve a desired control of warpage. 16. The mold according to claim 15, wherein the fixed type melt rotation device achieves an asymmetric melt condition. 17. The mold according to claim 15, wherein the fixed type melt rotation device achieves a generally symmetrical melt condition. 18. The mold according to claim 14, wherein the melt rotation device is of the adjustable type and achieves a desired rotation of the non-homogeneous melt conditions to achieve a desired control of warpage. 19. The mold according to claim 18, wherein the adjustable type melt rotation device achieves an asymmetric melt condition. 20. The mold according to claim 18, wherein the adjustable type melt rotation device achieves a generally symmetrical melt condition. 21. The mold according to claim 14, further comprising a melt condition controller that allows adjustment of at least one molding process variable to assist in control of the warpage direction and/or magnitude. 22. The mold according to claim 21, wherein the process variable is selected from the group of material temperature, pack pressure, flow rate and pack time. 23. The mold according to claim 14, wherein the mold is a cold runner mold. 24. The mold according to claim 14, wherein the plastic part is a thermosetting or thermoplastic part. 25. A part forming system including a melt rotation device for controlling non-homogeneous melt conditions which occur in a direction across the flow path of laminates of a stream of laminar flowing material flowing through a flow channel to control the direction and/or magnitude of warpage in formed plastic parts, comprising: at least one branching runner forming a flow channel through which a stream of laminar flowing material flows during formation of the parts by filling of at least one mold cavity defining the parts; and at least one melt rotation device located downstream of a last branch in at least a portion of the runner in which the non-homogeneous conditions occur across the stream of laminar flowing material, the melt rotation device being strategically positioned in the flow channel defined by the at least one runner to desirably position the non-homogeneous melt conditions and individually control warpage direction and magnitude of individual plastic parts formed by the system from filling of an individual one of the at least one mold cavity. 26. The part forming system according to claim 25, further comprising a melt condition controller that allows adjustment of at least one molding process variable selected from the group of material temperature, pack pressure, flow rate and pack time to assist in control of the warpage direction and/or magnitude.
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