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특허 상세정보

Plastic expulsion process

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B29D-022/00   
미국특허분류(USC) 264/040.4; 264/040.1; 264/572
출원번호 US-0902354 (2001-07-10)
발명자 / 주소
출원인 / 주소
인용정보 피인용 횟수 : 8  인용 특허 : 33
초록

A system and process for gas assisted plastic injection molding. The plastic material is injected into the mold cavity and the molding pressure is held for a period of time. Thereafter, gas is injected into the plastic material and the pressure is again held for a period of time. Thereafter, valve members are opened allowing plastic to be expelled into one or more secondary cavities, or to be expelled back into the machine barrel.

대표
청구항

1. A process for injection molding a hollow plastic article comprising the steps of:(a) injecting a quantity of plastic material into a mold cavity to substantially fill the mold cavity;(b) applying a packing pressure to the plastic in the mold cavity;(c) injecting pressurized gas into the plastic material in the mold cavity in order to combine the application of packing pressure to the plastic;(d) holding the pressure of the gas and plastic in the mold cavity for a predetermined amount of time; and(e) allowing a portion of the plastic material in the mo...

이 특허에 인용된 특허 (33)

  1. Yasuike ; Akio ; Kataoka ; Hiroshi ; Fujikawa ; Tutomu ; Suzuki ; Naoto. Apparatus for injection molding synthetic resin materials. USP1978084106887.
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  3. Hanning Robert (Via Tagliaferri 15 Campione d\Italia IT). Apparatus for making thermoplastic articles with porous cores and less porous or nonporous skins. USP1977074033710.
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  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.
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