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특허 상세정보

Method and apparatus for microcellular polymer extrusion

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B29C-044/20   
미국특허분류(USC) 264/050; 264/051; 264/053
출원번호 US-0626808 (2000-07-27)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Wolf, Greenfield &
인용정보 피인용 횟수 : 70  인용 특허 : 46
초록

Continuous polymeric extrusion nucleation systems and methods useful for making polymeric microcellular foamed materials, including crystalline and semi-crystalline polymeric microcellular materials, are provided. Pressure drop rate is an important feature in some embodiments, and the invention provides systems for controlling these and other parameters. One aspect involves a multiple-pathway nucleator that is separated from a shaping die by a residence chamber. Another aspect involves a die for making advantageously thick articles, including a multiple-...

대표
청구항

1. A method comprising:establishing a stream of polymeric material flowing at a rate of at least about 5 lbs per hour within a polymer processing space between a rotating screw and an extruder barrel; introducing, into the stream of polymeric material, a blowing agent through a plurality of orifices of the extruder barrel while passing the orifices with a flight of the rotating screw; and admixing the polymeric material and the blowing agent to form a single-phase solution of polymeric material and blowing agent, wherein the blowing agent is present in t...

이 특허에 인용된 특허 (46)

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