Method and apparatus for substantially constant pressure injection molding of thinwall parts
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B29C-045/77
B29C-045/18
출원번호
US-0476584
(2012-05-21)
등록번호
US-9272452
(2016-03-01)
발명자
/ 주소
Altonen, Gene Michael
Dodd, Michael Thomas
Ramon-Martinez, Natalia Maria
McConnell, Kimberly Nichole
Lumpkin, Danny David
Breidenbach, Vincent Sean
Lawson, John Russell
출원인 / 주소
iMFLUX, Inc.
대리인 / 주소
Ware, Charles R.
인용정보
피인용 횟수 :
1인용 특허 :
22
초록▼
A substantially constant pressure injection molding method and machine that forms molded parts by injecting molten thermoplastic material into a mold cavity at a substantially constant pressures. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow
A substantially constant pressure injection molding method and machine that forms molded parts by injecting molten thermoplastic material into a mold cavity at a substantially constant pressures. As a result, the mold cavity is filled with molten thermoplastic material by advancing a continuous flow front of thermoplastic material from a gate to an end of the mold cavity.
대표청구항▼
1. A method of injection molding a thinwall part at a substantially constant pressure, the method comprising: operating an injection system to advance molten thermoplastic material into a mold cavity at an increasing power until a predetermined injection pressure is reached;adjusting a filling press
1. A method of injection molding a thinwall part at a substantially constant pressure, the method comprising: operating an injection system to advance molten thermoplastic material into a mold cavity at an increasing power until a predetermined injection pressure is reached;adjusting a filling pressure profile to cause the power of the injection system to peak within a first 30% of the mold cavity being filled; andreducing the power of the injection system to maintain a substantially constant injection pressure from when the predetermined injection pressure is reached until the mold cavity is at least substantially filled with the thermoplastic material. 2. The method of claim 1, wherein the adjusting includes adjusting the filling pressure profile to cause the power of the injection system to peak within a first 20% of the mold cavity being filled. 3. The method of claim 1, wherein the adjusting includes adjusting the filling pressure profile to cause the power of the injection system to peak within a first 10% of the mold cavity being filled. 4. The method of claim 1, wherein the operating includes operating the injection system to maintain a substantially continuous and moving flow front of the molten thermoplastic material that advances through the mold cavity. 5. The method of claim 1, wherein the operating includes operating the injection system to fill the mold cavity to at least 99% full before the thermoplastic material begins to freeze at its flow front. 6. The method of claim 1, wherein the operating includes operating the injection system to fill the mold cavity, which has an L/T ratio of 100 or greater. 7. The method of claim 1, wherein the operating includes operating the injection system to fill the mold cavity, which has an L/T ratio of 200 or greater. 8. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which fluctuates no more than 30%. 9. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which fluctuates no more than 20%. 10. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 10,000 psi. 11. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 8,000 psi. 12. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 7,000 psi. 13. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure, which is less than 6,000 psi. 14. The method of claim 1, wherein the reducing includes reducing the power of the injection system to maintain the substantially constant injection pressure from when the predetermined injection pressure is reached until the mold cavity is completely filled with the thermoplastic material. 15. The method of claim 1, wherein the adjusting includes adjusting the filling pressure profile to cause the power of the injection system to peak at a peak power that is at least 30% less than a conventional peak power for a conventional, high, variable pressure injection molding process having a peak pressure that is greater than about 15,000 psi. 16. The method of claim 1, wherein the adjusting includes adjusting the filling pressure profile to cause the power of the injection system to peak at a peak power that is at least 50% less than a conventional peak power for a conventional, high, variable pressure injection molding process having a peak pressure that is greater than about 20,000 psi. 17. The method of claim 1, wherein the thermoplastic material is selected from the group consisting of acrylonitrile butadiene styrene, acetal copolymer, polypropylene, nylon, polycarbonate, polystyrene, styrene acrylonitrile, polyethylene, polyvinyl fluoride, polytrimethylene terepthalate, polybutylene terephthalate, polylactic acid and a thermoplastic elastomer and wherein the substantially constant injection pressure is less than 10,000 psi. 18. The method of claim 17, wherein the material is acrylonitrile butadiene styrene and the substantially constant injection pressure is less than 8,000 psi. 19. The method of claim 17, wherein the material is polyester and the substantially constant injection pressure is less than 5,800 psi. 20. The method of claim 17, wherein the material is acetal copolymer and the substantially constant injection pressure is less than 7,000 psi.
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이 특허에 인용된 특허 (22)
Boucher Paul Y. (220 Elmgrove Tecumseh ; Ontario CAX N8N 3S3) Koscic David J. (425 Gauthier Tecumseh ; Ontario CAX N8N 2W3) Ford John R. (270 Woodbridge Drive Tecumseh ; Ontario CAX N8N 3A4), Apparatus for manufacturing a composite product.
Hata Masaharu (Utsunomiya JPX) Nonomura Akira (Tochigi JPX), Method for controlling fluctuation in flow property of resin in injection molding machine.
Altonen, Gene Michael; Dodd, Michael Thomas; Ramon Martinez, Natalia Maria; McConnell, Kimberly Nichole; Lumpkin, Danny David; Breidenbach, Vincent Sean; Lawson, John Russell, Method and apparatus for substantially constant pressure injection molding of thinwall parts.
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