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특허 상세정보

Open mold molding

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B29D-022/00   
미국특허분류(USC) 264/572; 425/130
출원번호 US-0250280 (2003-06-20)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 8  인용 특허 : 45

A method and system for producing thin walled plastic products with hollow rib members using gas-assisted plastic injection molding. The mold is allowed to open a predetermined distance as the gas is injected into the plastic material in the mold cavity. A plurality of post members, such as ejector pins, are located on a biased ejector frame and maintain their positions relative to the mold cavity in order to form solid portions or areas in the molded part.


1. A process for forming a plastic article by gas-assisted plastic injection molding comprising the steps of:providing a mold with a first mold member and a second mold member, and an article defining cavity formed between said first and second mold members; providing a plurality of post members with first ends positioned in said second mold member and in communication with said mold cavity and second ends positioned in a biased frame member; injecting a quantity of plastic material into said mold cavity; injecting a pressurized gas into the plastic mate...

이 특허에 인용된 특허 (45)

  1. Yasuike ; Akio ; Kataoka ; Hiroshi ; Fujikawa ; Tutomu ; Suzuki ; Naoto. Apparatus for injection molding synthetic resin materials. USP1978084106887.
  2. Hendry, James W.. Apparatus for making a twin-wall, internally corrugated plastic structural part with a smooth non-cellular skin. USP1985114555225.
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  4. Gosdin Michael,DEX. Apparatus for producing hollow plastic objects with pressurized gas injection after overflow cut-off. USP1999075928677.
  5. Jaroschek Christoph (Herbolzheim DEX). Apparatus for the injection molding of fluid-filled plastic bodies. USP1995065423667.
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  7. Hendry James W. (Spring Hill FL). Apparatus for the injection molding of thermoplastics. USP1988114781554.
  8. Tanada Akinori,JPX. Extended shaft and a mold of the extended shaft and an apparatus for molding the extended shaft and a method for molding the extended shaft. USP2000126159415.
  9. Loren Norman S. (24874 Chalk Farm Rd. Warren MI 48091). Gas assisted injection molding. USP1993045204050.
  10. Guergov Milko G.. Gas assisted injection molding with controlled internal melt pressure. USP2000026019918.
  11. Thomas, Ronald; Pitstick, Nicholas. Gas injected compression molding. USP2003086602460.
  12. Nunnery, Len; Zappitelli, Francis; Riddle, Jody. Gas-assisted injection molding of thermosetting polymers. USP2003066576170.
  13. Hafele Robert X. (Baton Rouge LA). Injection blow molding apparatus. USP1986084604044.
  14. Hafele Robert X. (Baton Rouge LA). Injection blow molding process. USP1982114357296.
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  20. Egli Ernst (Bischofszell CHX). Method and apparatus for injection molding foamed plastic articles using a pre-pressurized mold having fixed core member. USP1980064208368.
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  23. Weber ; Hermann P.. Method for injection molding lenses. USP1978054091057.
  24. Friederich ; Ernst. Method for injection molding of hollow shaped bodies from thermoplastic resins. USP1978074101617.
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  34. Kaneishi Akimasa (Hiratsuka JPX) Kiboshi Sinji (Hiratsuka JPX) Mio Isamu (Hiratsuka JPX) Fukui Michiyasu (Osaka JPX). Mold apparatus and injection molding method for producing hollow-structured article by injection molding. USP1997085656234.
  35. Olabisi Olagoke (Plainfield NJ). Molded plastic structural web articles. USP1980114234642.
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