EP0104938B1 - Readily attachable and detachable electron-beam permeable window assembly - Google Patents

Readily attachable and detachable electron-beam permeable window assembly Download PDF

Info

Publication number: EP0104938B1
Authority: EP; European Patent Office
Prior art keywords: frame; housing; window; electron beam; web
Prior art date: 1982-09-29
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired

Application number

EP19830305776

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0104938A3 (en

EP0104938A2 (en

Inventor

Richard Norcross Cheever

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Tetra Laval Holdings and Finance SA

Original Assignee

Tetra Laval Holdings and Finance SA

Tetra Pak Finance and Trading SA

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1982-09-29

Filing date

1983-09-27

Publication date

1989-03-22

1983-09-27 Application filed by Tetra Laval Holdings and Finance SA, Tetra Pak Finance and Trading SA filed Critical Tetra Laval Holdings and Finance SA

1984-04-04 Publication of EP0104938A2 publication Critical patent/EP0104938A2/en

1985-10-16 Publication of EP0104938A3 publication Critical patent/EP0104938A3/en

1989-03-22 Application granted granted Critical

1989-03-22 Publication of EP0104938B1 publication Critical patent/EP0104938B1/en

Status Expired legal-status Critical Current

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Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
- H01J5/18—Windows permeable to X-rays, gamma-rays, or particles
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J33/00—Discharge tubes with provision for emergence of electrons or ions from the vessel; Lenard tubes
- H01J33/02—Details
- H01J33/04—Windows

Definitions

the present invention relates to electron beam irradiation apparatus and more particularly to such apparatus incorporating electron beam permeable windows as of thin metal foil and the like, being directed to improvements in enabling the more facile and fast replacement of such window structures as the electron beam irradiation exit for evacuated electron beam generator housings and the like.
a window assembly for the passage of an irradiating beam has also been proposed in DE-A-3022127 to the Hahn-Meitner-Institute for Nuclear Science, Berlin GmbH. This essentially comprises a thin metal window housed in a frame for insertion between supporting flanges.
apparatus for electron beam irradiation of a moving web comprising a housing, means in the housing for emitting a beam of electrons through an opening in the housing to irradiate the web, an electron beam window assembly between the housing opening and the web characterised in that the window assembly has a movable frame provided with an opening for passage of the electron beam, an electron beam permeable window overlying the frame opening and having a marginal region secured to one side of the frame and a peripheral region supported by the frame laterally inwardly of the marginal region, a sealing ring between the electron beam housing and said peripheral region of the window, tab means extending laterally outwardly from the frame and fixed thereto, flange means for supporting the frame in the housing, and locking means cooperative with the flange means and the housing and adapted when inactivated to permit insertion or withdrawal of the frame by the tab means respectively to or from a position under the sealing ring, and adapted when activated to cause a locking force to be exerted against the flange
exit for electron beam generators is generally a titanium or aluminium thin window or composites of the same or similar materials.
the thin window may have to be replaced on a relatively frequent schedule, which is a serious problem in production operation. The corrosion from the vapors weakens the windows and, of course, they fail.
the present invention ameliorates the problem of the costly and time-consuming replacement of windows in conventional fashion by providing a novel readily attachable and detachable electron-beam permeable window assembly or cassette that enables rapid replacement of windows, say every few weeks for aluminum, or even every day, and by relatively unskilled individuals.
a pair of longitudinally spaced opposed normally evacuated electron-beam housings H are shown assembled for purposes of irradiating opposite sides of a web, so- labelled, or materials carried thereby passing longitudinally along a tunnel T.
Each housing H supports within its interior the electron-emitting cathode C, as of the types described in said Letters Patent or of other conventional types, and is shown provided with an exit region at the bottom (or top for the lower unit) at which there is an opening 0 over which the electron-beam permeable thin metal window W is to be sealed. This sealing is effected against resilient marginal O-rings designated at 1 and peripherally clamping against the window W and holding it in sealed assembly.
the thin electron beam window W in accordance with the invention, overlies an opening 0' in a rectangular frame F that supports the thin window over the opening 0', with the window W resting on the upper side of the frame F and secured thereto near outer margins as at M by a thin layer of adhesive or tape A.
the margins are outside the region where the sealing ring 1 will ultimately clamp against the window W, such that a peripheral region supported by the frame is provided against which the sealing rings 1 will ultimately bear, this being inward of the sealing near the margin of the window.
tab means of other handle means T' is provided extending beyond the frame F to permit the user to handle the frame assembly without touching the window and to be able to insert and remove the same from under the sealing ring 1.
a peripheral flange FL which supports the frame assembly on the side opposite the window, and this bears against the outer wall of the tunnel T bounding a pathway or region R through which the article or material to be sterilized or otherwise electron-beam-irradiated for other purposes, labelled "Web", is passed.
the housing H is bolted to the tunnel conduit at B so that the two form a single structural unit.
a locking means in the form of an inflatable resilient balloon I which, when inflated, bears against the under side of the flange FL and forces the frame F carrying the window W against the sealing ring 1.
the user inserts the assembly or cassette comprising the window W carried by the frame F by the tab T', with the locking mechanism I deflated or inactivated; and the same is pushed in, stopping as a result of a limit step S on the tab T' engaging the outer edge of the flange FL, providing for positive location in just the right position.
Inflation or activation of the locking mechanism I will then force the flange FL and thus the frame F and window W up against the sealing ring 1 and effect the desired seal to the housing H, whereupon the housing may again be evacuated and operation may continue with the replaced window.
Sponge rubber resilient seals 3 adjacent to the lock-sealing balloon I and between window frame F and flange FL are shown provided to seal the cassette in the wall of the tunnel T against leakage of ozone.
the frame FL is depressed against the gas-seal 3 to permit insertion and removal of the window assembly.
a cam (not shown) at either transverse end could be employed and rotated to assist in this depression step.
Typical dimensions for a suitable frame and window operable with electron beam energy in the range of 150 KEV, more or less, for such purposes as sterilizing packaging or the like, are 40 cm by 15 cm with a 12 micrometer titanium window foil W.

Landscapes

Particle Accelerators (AREA)
Apparatus For Disinfection Or Sterilisation (AREA)
Physical Or Chemical Processes And Apparatus (AREA)

EP19830305776 1982-09-29 1983-09-27 Readily attachable and detachable electron-beam permeable window assembly Expired EP0104938B1 (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US42790382A	1982-09-29	1982-09-29
US427903		1982-09-29

Publications (3)

Publication Number	Publication Date
EP0104938A2 EP0104938A2 (en)	1984-04-04
EP0104938A3 EP0104938A3 (en)	1985-10-16
EP0104938B1 true EP0104938B1 (en)	1989-03-22

Family

ID=23696782

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19830305776 Expired EP0104938B1 (en)	1982-09-29	1983-09-27	Readily attachable and detachable electron-beam permeable window assembly

Country Status (3)

Country	Link
EP (1)	EP0104938B1 (2)
JP (1)	JPS5984200A (2)
DE (1)	DE3379486D1 (2)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPH052100A (ja) *	1990-10-12	1993-01-08	Toshiba Corp	電子ビーム照射装置および電子ビーム透過膜の製造方法
EA201990536A1 (ru)	2016-08-20	2019-08-30	Бюлер Аг	Устройства и способ пастеризации и/или стерилизации продукта в виде частиц и кассета

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE760042C (de) *	1940-09-20	1954-02-22	Siemens & Halske A G	Schnellverschluss fuer ein vakuumdichtes Gefaess, insbesondere ein Zyklotron
US3440466A (en) *	1965-09-30	1969-04-22	Ford Motor Co	Window support and heat sink for electron-discharge device
JPS5953089B2 (ja) *	1976-11-29	1984-12-22	株式会社荏原製作所	放射線照射排ガス処理用リアクタ−入射窓の窓箔交換法
DE3022127A1 (de) *	1980-06-10	1982-01-07	Hahn-Meitner-Institut für Kernforschung Berlin GmbH, 1000 Berlin	Strahlendurchtrittsfenster mit einer in einen rahmen gefassten duennen metallfolie
US4324980A (en) *	1980-07-21	1982-04-13	Siemens Medical Laboratories, Inc.	Electron exit window assembly for a linear accelerator
DE3108006A1 (de) *	1981-03-03	1982-09-16	Siemens AG, 1000 Berlin und 8000 München	Strahlenaustrittsfenster

1983
- 1983-09-27 DE DE8383305776T patent/DE3379486D1/de not_active Expired
- 1983-09-27 EP EP19830305776 patent/EP0104938B1/en not_active Expired
- 1983-09-29 JP JP18178783A patent/JPS5984200A/ja active Granted

Also Published As

Publication number	Publication date
JPS5984200A (ja)	1984-05-15
EP0104938A3 (en)	1985-10-16
DE3379486D1 (en)	1989-04-27
EP0104938A2 (en)	1984-04-04
JPH0517520B2 (2)	1993-03-09

Legal Events

Date	Code	Title	Description
1984-02-04	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1984-04-04	AK	Designated contracting states	Designated state(s): CH DE FR GB IT LI NL SE
1984-07-04	RBV	Designated contracting states (corrected)	Designated state(s): CH DE FR GB IT LI NL SE
1985-08-14	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1985-10-16	AK	Designated contracting states	Designated state(s): CH DE FR GB IT LI NL SE
1986-04-02	17P	Request for examination filed	Effective date: 19860124
1986-08-06	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: TETRA PAK FINANCE & TRADING S.A.
1987-06-16	17Q	First examination report despatched	Effective date: 19870505
1989-02-04	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1989-03-22	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): CH DE FR GB IT LI NL SE
1989-04-27	REF	Corresponds to:	Ref document number: 3379486 Country of ref document: DE Date of ref document: 19890427
1989-05-11	ITF	It: translation for a ep patent filed
1989-07-28	ET	Fr: translation filed
1990-01-17	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
1990-01-17	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
1990-03-07	26N	No opposition filed
1991-09-30	ITTA	It: last paid annual fee
1995-01-31	EAL	Se: european patent in force in sweden	Ref document number: 83305776.3
2002-01-01	REG	Reference to a national code	Ref country code: GB Ref legal event code: IF02
2002-09-25	PGFP	Annual fee paid to national office [announced via postgrant information from national office to epo]	Ref country code: GB Payment date: 20020925 Year of fee payment: 20 Ref country code: FR Payment date: 20020925 Year of fee payment: 20
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2003-09-26	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LI Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20030926 Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20030926 Ref country code: CH Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20030926
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2003-11-04	EUG	Se: european patent has lapsed
2003-12-01	NLV7	Nl: ceased due to reaching the maximum lifetime of a patent	Effective date: 20030927

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