[특허]Method for leak testing and leak testing apparatus

Method for leak testing and leak testing apparatus 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01M-003/32 G01M-003/34
출원번호	US-0815952 (2010-06-15)
등록번호	US-8459099 (2013-06-11)
우선권정보	WO-PCT/IB98/00039 (1998-03-10)
발명자 / 주소	Lehmann, Martin
출원인 / 주소	Wilco AG
대리인 / 주소	Antonelli, Terry, Stout & Kraus, LLP.
인용정보	피인용 횟수 : 0 인용 특허 : 47

초록 ▼

For leak testing closed containers (9) which are filled with a filling product containing at least one liquid component the container is introduced in a test cavity (1) which is evacuated at least down to vapor pressure of that liquid component. The pressure in the surrounding of the container (9) and thus within test cavity (1) is monitored. Monitoring is performed by a vacuum pressure sensor (7), whereas lowering pressure surrounding the container (9) is performed by a vacuum pump (5). Leakage is detected by monitoring a pressure change in the surrounding of the container which is due to evaporation of liquid emerging from a leak and being evaporated in the low pressure surrounding.

대표청구항 ▼

1. A method for producing closed, product-filled containers which are unleaky, and filled with a liquid, the method comprising: filling containers with a liquid;sealingly closing said containers;in-line leak testing one container after the other to establish whether said container is leaky or unleaky by:applying a pressure difference across at least a part of a wall of the container which part is to be tested by evacuating the surrounding of said container at least along said part of said wall to establish in said surrounding a pressure of at least vapor pressure value of at least one component of said liquid; monitoring the pressure course in said surrounding by means of a pressure sensor and evaluating the pressure course in said surrounding as monitored by said pressure sensor during the evacuating and from having reached said vapor pressure value to establish whether said container is leaky or unleaky, whereby a leak down to 0.02 μm is detectable for establishing leakiness, and wherein said in-line leak-testing to establish whether said container is leaky or unleaky occurs in a short test cycle time of a few seconds. 2. The method of claim 1, further comprising performing said evacuating by means of a pumping arrangement, said evaluating comprising sensing loading of said pumping arrangement during evacuation by evaporation of said at least one liquid component as a leak indication. 3. The method of claim 1 or 2, wherein said surrounding is evacuated towards a pressure value which is lower than said vapor pressure by a factor of at least two decades (10−2). 4. The method of claim 1 or 2, wherein said product comprises more than one liquid component and said vapor pressure is the higher vapor pressure of the vapor pressures of said more than one liquid component. 5. The method of claim 1 or 2, wherein said testing is performed at room temperature. 6. The method of claim 1 or 2, wherein said evaluating the pressure comprises sensing said pressure in said surrounding at a first and at a second point in time, utilizing a difference of the results of said sensing at said first and second points in time as a leak indication. 7. The method of claim 1 or 2, wherein said evaluating the pressure comprises sensing absolute pressure. 8. A method for testing sealingly closed containers which are filled with a liquid, the method comprising: in-line leak testing one container after the other to establish whether said sealingly closed container is leaky or unleaky by,applying a pressure difference across at least a part of a wall of said container, which part is to be tested by evacuating the surrounding of said container at least along said part of said wall to establish in said surrounding a pressure of at least vapor pressure value of at least one component of said liquid;monitoring the pressure course in said surrounding by means of a pressure sensor and evaluating the pressure course in said surrounding as monitored by said pressure sensor during the evacuating and from having reached said vapor pressure value to establish whether said container is leaky or unleaky, whereby a leak down to 0.02 μm is detectable for establishing leakiness, and wherein said in-line leak testing to establish whether said container is leaky or unleaky occurs in a short test cycle time of a few seconds. 9. The method of claim 8, further comprising performing said evacuating by means of a pumping arrangement, said evaluating comprising sensing loading of said pumping arrangement by evaporation of said liquid component during evacuation as a leak indication. 10. The method of claim 8 or 9, wherein said surrounding is evacuated towards a pressure value which is lower than said vapor pressure by a factor of at least two decades (10−2). 11. The method of claim 8 or 9, wherein said liquid comprises more than one liquid component and said vapor pressure is the higher pressure of the vapor pressures of said more than one liquid component. 12. The method of claim 8 or 9, wherein said testing is performed at room temperature. 13. The method of claim 8 or 9, wherein said evaluating the pressure comprises sensing said pressure in said surrounding at a first and at a second point in time and utilizing a difference of the results of said sensing at said first and second points in time as a leak indication. 14. The method of claim 8 or 9, wherein said evaluating the pressure comprises sensing absolute pressure. 15. The method of claim 1 or 8, wherein the containers are selected from the group consisting of vials and medical application containers. 16. The method of claim 1 or 8, where said short test cycle time is one to three seconds.

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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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Method for leak testing and leak testing apparatus 원문보기

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Method for leak testing and leak testing apparatus 원문보기

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