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특허 상세정보

Gas assisted injection molding with controlled internal melt pressure

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B29C-045/00   
미국특허분류(USC) 264/040.3 ; 264/040.1 ; 264/572
출원번호 US-0784986 (1997-01-17)
발명자 / 주소
대리인 / 주소
    Brooks & Kushman P.C.
인용정보 피인용 횟수 : 15  인용 특허 : 30
초록

A method is provided for gas-assisted injection molding for forming a hollow product. The mold cavity is prepressurized with fluid prior to injecting the molten material into the mold cavity, and the molten material is injected into the mold cavity against the pressurized fluid to establish a resultant internal counterpressure within the molten material. A pressurized assist-gas is injected into the molten material to form a gas bubble within the molten material. The injection of molten material into the cavity is then controlled in a manner to maintain ...

대표
청구항

[ What is claimed is:] [1.] A method of gas-assisted injection molding of molten material into a mold cavity to form a hollow product, wherein the molten material experiences up to a predetermined maximum shrinkage stress when the molten material is constrained within the mold cavity, the method comprising:supplying pressurized fluid to the mold cavity prior to injecting the molten material into the mold cavity;injecting the molten material into the mold cavity against the pressurized fluid to establish a resultant internal melt pressure within the molte...

이 특허에 인용된 특허 (30)

  1. Lemelson Jerome H. (85 Rector St. Metuchen NJ 08840). Apparatus and method for controlling the internal structure of matter. USP1981094288398.
  2. Hendry James W. (Spring Hill FL). Apparatus for compressing a gas. USP1988064750409.
  3. Shah Suresh D. (Troy MI) Visconti Carl H. (Clarkston MI). Gas-assisted plastics injection molding with controlled melt flow and method of controlling melt flow. USP1996095558824.
  4. Guergov Milko G.. Injection control system. USP1998025716561.
  5. Gahan Geoffrey D. (Great Missenden GB2). Injection molding apparatus having a sprue holder with an inclined retractable ram. USP1985024498860.
  6. Sayer Matthew E. (Tamworth GB2). Injection moulding apparatus. USP1988044740150.
  7. Erlenbach Hans (Hermann-Lons-Strasse 13 Nastatten D-5428 DEX). Machine for the production of molded parts from foamed plastic. USP1987084685872.
  8. Guergov Milko G. (615 Washington ; #5 Monroe MI 48161). Method and apparatus for injecting a molten material into a mold cavity. USP1997095662841.
  9. Guergov Milko G. (615 Wahington ; #5 Monroe MI 48161). Method and apparatus for injection molding. USP1995085441680.
  10. Egli Ernst (Bischofszell CHX). Method and apparatus for injection molding foamed plastic articles using a pre-pressurized mold having fixed core member. USP1980064208368.
  11. Sayer Matthew E. (Tamworth GB2). Method and apparatus for injection moulding. USP1990054923667.
  12. Korpela Heikki (Hvitsmansgatan 8 Helsingborg SEX S-252 37) Ampler Leif (Kaprifolgatan 65 Vstra Frlunda SEX S-421 69). Method and apparatus for measuring and controlling the volumetric weight of an expanded particulate material. USP1989074852028.
  13. Friederich ; Ernst. Method for injection molding of hollow shaped bodies from thermoplastic resins. USP1978074101617.
  14. Hendry James W. (Brooksville FL). Method of and apparatus for injection molding with pressurized fluid assist. USP1990074943407.
  15. Loren Norman S. (Warren MI). Method of and apparatus for injection molding with pressurized-fluid assist. USP1990074942006.
  16. Kumazaki Hiroshi (Numazu JPX). Method of controlling pressurized gas, before and after injecting a molten material, in a mold cavity. USP1987064675141.
  17. Lemelson Jerome H. (Call Box 14-286 ; 868 Tyner Way Incline Village NV 89450). Method of controlling the internal structure of matter. USP1993115264163.
  18. Balevski Anguel Tonchev (Sofia BG) Nikolov Ivan Dimov (Sofia BG) Antonov Asparuh Mihailov (Sofia BG) Semerdjiev Stefan Georgiev (Sofia BG). Method of injection molding a thermoplastic article having a cellular core and integral skin involving use of reclaimed. USP1976063960996.
  19. Yamazaki Kunio (Takatsuki JPX) Watanabe Tetsuzi (Toyonaka JPX). Method of injection moulding. USP1990054923666.
  20. Balevski ; Angel Tonchev ; Nikolov ; Ivan Dimov ; Mateev ; Evgeni Hris tov ; Trifonov ; Todor Kostadinov ; Kojuharov ; Vassil Vladimirov. Method of producing molded parts with a smooth noncellular skin and a cellular core from foamable thermoplastic materia. USP1978054092385.
  21. Lemelson Jerome H. (85 Rector St. Metuchen NJ 08840). Molding apparatus. USP1982034318874.
  22. Young Gerald T. (Conway NH) Easterling Michael R. (Windsor VT) Dukeshire Robert E. (Hartland VT). Molding articles of thermoplastic rubber. USP1982064333901.
  23. Hayakawa Akifumi (Tokyo JPX) Aiba Akira (Kawasaki JPX) Orihara Eiki (Tokyo JPX) Fukushima Kiyoshi (Fujisawa JPX). Mould assembly for foam moulding of plastic materials. USP1979054153231.
  24. Shah Suresh D. (Rochester Hills MI) Hlavaty David G. (Allen Park MI). Plastics injection molding device with multipositioning construction for gas assisted molding. USP1994085342191.
  25. Hendry James W. (Spring Hill FL) Cahan Geoffery D. (Little Kingshill GB2). Process and apparatus for injection moulding and mouldings produced thereby. USP1989044824732.
  26. Arnold John W. (West Bloomfield MI) Mills Steven L. (Bloomfield Hills MI). Process and apparatus for nucleation control adapted for reaction injection molding of cellular products. USP1982014312820.
  27. Hendry James W. (Brooksville FL). Process for injection molding and hollow plastic article produced thereby. USP1992035098637.
  28. Angell ; Jr. Richard G. (Somerville NJ) Anderson Robert J. (Whitehouse Station NJ) Hobbs Kenneth E. (Helmetta NJ) James David E. (Elkview WV) Marsh B. Duane (Somerville NJ). Process for producing molded structural foam article having a surface that reproducibly and faithfully replicates the su. USP1976103988403.
  29. Kopernicky Jaro (Bramalea CAX). Removing volatiles from plastic materials delivered to an extrusion or injection molding machine. USP1987014636084.
  30. Kojima Hisashi (Tokyo JPX). Ultrahigh speed injection molding method. USP1989014797236.

이 특허를 인용한 특허 피인용횟수: 15

  1. Altonen, Gene Michael; Neufarth, Ralph Edwin; Schiller, Gary Francis. Apparatus for injection molding at low constant pressure. USP20180910076861.
  2. Tokunou, Ryuichi. Injection molding machine and injection molding method. USP2016059346204.
  3. Desmith, Brian L.; Mozer, Wilfried; Zawacki, Jeffrey R.. Interchangeable mold tooling. USP2012038128394.
  4. Hendry, James W.. Method for injection molding of plastic materials using gas holding pressure in mold. USP2005026855280.
  5. Mozer, Wilfried; Desmith, Brian L.. Method of manufacture of a foamed core class “A” article. USP2011118048347.
  6. DeCost, Norman. Method of molding a cart using molding processes. USP2003076589458.
  7. Rice, Frank J.; Laabs, Jr., Bruce A.; Knicklebine, Dave P.. Molded article having hollow rim portion and process for producing articles. USP2005056887406.
  8. Hendry, James; Homann, Gregory A.; Turczynski, David. Open mold molding. USP2005056890478.
  9. Homann, Gregory A.; Turczynski, David. Plastic injection molded articles with hollow rib members. USP2005056890477.
  10. Homann, Gregory A.; Hendry, James; Turczynski, David. Plastic injection molding with moveable insert members. USP2005096939504.
  11. Homann, Gregory A.. Plastic injection molding with moveable mold members forming speaker grill. USP2005056899843.
  12. Valentz, Arthur J.; Nemazi, John E.; Proscia, James W.. Skylight having a molded plastic frame. USP2012078225560.
  13. Valentz, Arthur J.; Nemazi, John E.; Proscia, James W.. Skylight having a molded plastic frame. USP2013038393120.
  14. Valentz, Arthur J.; Nemazi, John E.; Proscia, James W.. Skylight having a molded plastic frame. USP2011108028478.
  15. Valentz, Arthur J.; Nemazi, John E.; Proscia, James W.. Window-containing assemblies having a molded plastic frame. USP2012108291674.