[특허]Method of welding thermoplastic substrates with microwave frequencies

Method of welding thermoplastic substrates with microwave frequencies 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B32B-027/36
출원번호	US-0481296 (1990-02-20)
발명자 / 주소	Lause Herbert J. (Murrysville PA) Parks Kristen L. (Robinson Township Indiana County PA) Tanis Larry D. (Kiskiminetas PA) Leon David D. (Murrysville PA)
출원인 / 주소	Aluminum Company of America (Pittsburgh PA 02)
인용정보	피인용 횟수 : 46 인용 특허 : 0

초록 ▼

Microwave frequencies in the range of 0.5 GHz to 10 GHz are used to weld thermoplastic substrates by interposing a carrier strip. The strip is formed of a polymer carrier which is miscible in the substrates. Electrically conductive submicron carbon black susceptor particles are chosen with specified properties such that they generate enough heat within a specified time to produce a weld in which the heat generated is confined to the weld zone. The resulting weld is such that the welded assembly has essentially the same dimensions as the clamped assembly. Glass fiber reinforced substrates are welded without breaking glass fibers in the weld zone. Lap strength of welded substrates is greater than that of substrates joined by prior art methods, whether by welding or adhesive bonding. Articles microwave welded in accordance with the invention are useful for manufacturing and repairing vehicle components such as automobile bumpers and dashboards and other structural parts of automobiles, aircraft, and spacecraft.

대표청구항 ▼

A method for welding substrates of a thermoplastic synthetic resinous material, comprising, (a) interposing between said substrates, in contact with each, in a weld-zone in which a weld is to be made, a strip comprising a thermoplastic carrier polymer miscible with said material, said carrier having dispersed therein from about 1% to 20% by weight of submicron electrically conductive carbon black particles which are absorptive to microwave frequencies in the range from about 0.5 GHz to about 10 GHz, which have a surface resistivity less than 100 ohmㆍcm/cm, and a BET surface area of at least about 100 m2/g, said substrates and strip forming an assembly; (b) subjecting said assembly to an electromagnetic field having sufficient power in said frequency range to heat said assembly non-uniformly, the temperature diminishing from above the glass transition temperature Tg or melting point Tm of said material near said interface, to below said Tg or Tm outside said weld-zone; and, (c) terminating exposure of said assembly to said field when said carrier vanishes by forming a single phase with said thermoplastic material of said substrates; whereby said weld is made without substantial deformation of said substrates in said assembly. A shaped article suitable for use as a structural vehicle component and consisting essentially of at least two sections of a fiber-reinforced material welded together by microwave energy in the frequency range from about 0.5 GHz to about 10 GHz, said article being formed by interposing between and in contact with said sections in a weld-zone, a strip having an average thickness in the range from about 5 to about 50 mils comprising a thermoplastic carrier polymer miscible with said material, said carrier having homogeneously dispersed therein from about 1% to 20% by weight of submicron electrically conductive carbon black particles which are absorptive to microwave frequencies in said range, which particles have a surface resistivity less than 100 ohmㆍcm/cm, a BET surface area of at least 100 m2/g, and an average primary particle size smaller than about 100 nanometers, said strip functioning to position said carbon black particles in said weld-zone; subjecting said weld-zone to an electromagnetic field having sufficient power in said frequency range to heat said assembly non-uniformly, the temperature in said weld-zone diminishing from above the glass transition temperature Tg or melting point Tm of said material near said interface, to below said Tg or Tm outside said weld-zone; terminating exposure of said assembly to said field when said carrier vanishes by forming a single phase with the thermoplastic material in said weld-zone; and, cooling said weld-zone to form said article having essentially the same dimensions as that of said assembly.

이 특허를 인용한 특허 (46)

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Vaideeswaran, Karthik; Sousa, Jose R.; Ghalambor, Hamid Reza; Clark, Sarah L.; Celik, Ceyhan; Hildreth, Jr., Gary Charles; Joshi, Helina, Method of forming large diameter thermoplastic seal.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Method of welding thermoplastic substrates with microwave frequencies 원문보기

초록 ▼

대표청구항 ▼

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연합인증

Method of welding thermoplastic substrates with microwave frequencies 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (46)

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