DE3341585A1 - Sterilisation using microwaves - Google Patents

Sterilisation using microwaves

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Publication number
DE3341585A1
DE3341585A1 DE19833341585 DE3341585A DE3341585A1 DE 3341585 A1 DE3341585 A1 DE 3341585A1 DE 19833341585 DE19833341585 DE 19833341585 DE 3341585 A DE3341585 A DE 3341585A DE 3341585 A1 DE3341585 A1 DE 3341585A1
Authority
DE
Germany
Prior art keywords
pressure
arrangement according
tight
operating space
windows
Prior art date
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.)
Withdrawn
Application number
DE19833341585
Other languages
German (de)
Inventor
Karl Dr. 7800 Freiburg Fritz
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.)
Snowdrift Corp Nv Curacao Niederlaendische An
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19833341585 priority Critical patent/DE3341585A1/en
Priority to DE8484108961T priority patent/DE3478560D1/en
Priority to AT84108961T priority patent/ATE43773T1/en
Priority to EP84108961A priority patent/EP0136453B2/en
Publication of DE3341585A1 publication Critical patent/DE3341585A1/en
Priority to US06/888,959 priority patent/US4775770A/en
Priority to US07/238,252 priority patent/US4866233A/en
Priority to US07/449,403 priority patent/US4952763A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/005—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment
    • A23L3/01—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by heating using irradiation or electric treatment using microwaves or dielectric heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/045—Microwave disinfection, sterilization, destruction of waste...

Abstract

The invention relates to an arrangement and method for sterilising objects, preferably in a vacuum-sealed package, by heating by means of microwaves at temperatures above 100 DEG , that is to say compression up to several bars. The pressure in the object and in its environment is achieved by simultaneous microwave heating of, if required, added fluid, in general water. The operating space is a little larger than the object and is in longitudinal resonance. In the event of radiation in from two windows, which are for example opposite one another, a temperature drop in each case such as cos<2>1 is produced, that is to say the response is in addition virtually a straight line with a constant ordinate. The wall of the operating space consists of two parts which can be sealed with respect to one another by means of mechanical pressure and an elastic intermediate layer. The inward radiation is produced through pressure-tight windows consisting of insulating material. When used in a continuous-flow process, the feed takes place synchronously, controlled by the temperature and/or pressure in the operating space. The conveyor belt can simultaneously act as the seal between the wall parts of the operating space and the windows. <IMAGE>

Description

Sterilisierung mit Mikrowellen Microwave sterilization

Für die Sterilisierung mit Mikrowellen ist entscheidend, ob die zu erreichende Temperatur unter oder über 1000 liegt. Der Grund liegt in dem Zwang, bei näherungsweise 100al und darüber den Vorgang in einem abgeschirmten Druckraum stattfinden zu lassen. Dadurch sind der Strahlungsausbildung im Arbeitsraum einengende Grenzen gesetzt und zur Homogenisierung der Strahlungsenergie im Objekt sind neue Verfahren notwendig.For the sterilization with microwaves it is crucial whether the to reaching temperature is below or above 1000. The reason lies in the compulsion at approximately 100al and above the process in a shielded pressure room to take place. This restricts the radiation formation in the work area There are new limits to the homogenization of the radiant energy in the object Procedure necessary.

Es sind Methoden bekannt1), die Objekte wenigstens in einer Dimension möglichst niedrig zu halten, um d-lt notwendige Eindringtiefe zu verringern und weiter den Temperaturausgleich nicht allein der Mikrowelle zu überla;;st?n, sondern durch konventionelle Wärmeleitung über flüssige oder gasförmige Zwischenmittel zu erreichen. Der notwendige Überdruck wird durch Druckwasser geliefert.Methods are known1), the objects in at least one dimension to be kept as low as possible in order to reduce the necessary penetration depth and further to not only leave the temperature compensation to the microwave ;; st? n, but by conventional heat conduction via liquid or gaseous intermediates reach. The necessary overpressure is provided by pressurized water.

Diese Einschränkungen benötigt das im folgenden angegebene; Verfahren nicht. Vielmehr wird das Objekt in der bisher üblichen Größe in einen Arbeitsraum gebracht, der aber nur wenig größer als das Objekt selbst ist und druckdicht abschliessbar ist. Die Energie wird durch druckdichte Fenster eingestrahlt.The following requires these restrictions; procedure not. Rather, the object is converted into a work space in the previously usual size brought, which is only slightly larger than the object itself and can be locked pressure-tight is. The energy is radiated through pressure-tight windows.

Wegen der Kleinheit des Arbeitsraumes können die früher geschilderten Verfahren mit Ausnutzen von Interferenzeffektee 2) nicht mehr voll zur Anwendung kommen, si müssen modifiziert werden. Letzteres ist ein weiterer integraler Punkt der vorliegenden Anmeldung.Due to the small size of the work area, the previously described Process with utilization of interference effects 2) no longer fully applicable come, they need to be modified. The latter is another integral point of the present application.

1) USA Pat. 3 809 844 u. Folgepat.1) USA Pat. 3 809 844 and subsequent pat.

2) DBPa 30 02 632 u. a.2) DBPa 30 02 632 et al.

Ein Ausführungsbeispiel ergibt weitere Erläuterungen.An exemplary embodiment provides further explanations.

Abb. 1 zeigt eine Beispielsausführung schematisch im Längsschnitt, 1 ist je ein Sender gleicher Leistung und Frequenz, 2 die Hohlrohrzuleitung, 3 eine stabile metallische Grundplatte mit den beiden Fenstern 4, 5 eine druckfeste dielektrische Schicht mit vernachlässigbaren Verlusten und kleiner Dielektrizitätskonstanten, 6 der Arbeitsraum, 7 das Objekt üblicher Form und Größe, 8 die druckfeste metallische Außenwand in Schalenform mit Hohl flächen zur Aufnahme gegebenenfalls von Kühlmitteln, 9 sind angedeutet HF-Fallen, 10 Druck- und Temperaturmeßstellen.Fig. 1 shows an example design schematically in longitudinal section, 1 is a transmitter with the same power and frequency, 2 is the hollow pipe, 3 is one stable metallic base plate with the two windows 4, 5 a pressure-resistant dielectric Layer with negligible losses and small dielectric constants, 6 the work area, 7 the object of normal shape and size, 8 the pressure-resistant metallic one Shell-shaped outer wall with hollow surfaces for holding coolants if necessary, 9 are indicated HF traps, 10 pressure and temperature measuring points.

Nach Einführung des Objektes wird die Schale 8 druckdicht aufgesetzt und mit üblichen mechanischen, hydro-aerodynamischen o. a. Verfahren angepreßt, wobei die Druck- und/ oder Temperaturwerte den Vorgang steuern.After the object has been introduced, the shell 8 is placed in a pressure-tight manner and with the usual mechanical, hydro-aerodynamic, etc. Procedure pressed, wherein the pressure and / or temperature values control the process.

Zur homogenen Erwärmung wird die Längsresonanz des Raumes benutzt und der passende Reflektionsabstand zu den Wänden.The longitudinal resonance of the room is used for homogeneous heating and the appropriate reflection distance to the walls.

Betrachten wir einen Sender für sich allein. Die Energiedichte fällt wegen der Absorption längs des Objektes vom Eintrittsfenster in Richtung des anderen ab, und zwar bei geeignet gewählter Dämpfung nahe wie cos. 4 1 l, lo ist der mittlere Fensterabstand, d. h. also nahezu linear.Let us consider a transmitter on its own. The energy density falls because of the absorption along the object from the entrance window towards the other with appropriately selected damping close to cos. 4 1 l, lo is the middle one Window spacing, d. H. so almost linear.

Beide Sender zusammen erzeugen also längs 1 einen fast konstanten Mittelwert. Ebenso reguliert sich die seitliche Verteilung bei dem passenden Reflektionsabstand der Wände.Both transmitters together therefore generate an almost constant along 1 Average. The lateral distribution is also regulated with the appropriate reflection distance of the walls.

Gegebenenfalls wird eine überhöhte Energiestrahlung an den Schmalseiten durch speziell geformte Blenden verhindert.If necessary, there is excessive energy radiation on the narrow sides prevented by specially shaped panels.

Damit die angepaßten Sender sich bei zu dichter Kohärenz nicht gegenseitig stören, werden sie im Wechseltakt betrieben mit im Mittel voller Leistung, bei Gleichspannungsbetrieb durch wechselweises Austasten, bei Wechselspannungsbetrieb durch Phasendifferenz von 1800 am Netzkontakt.So that the matched transmitters are not mutually exclusive if the coherence is too close disturb, they are operated in alternating cycles with an average of full power, with direct voltage operation through alternating blanking, in AC voltage operation through phase difference from 1800 at the network contact.

Normalerweise sind die Objekte vor der Behandlung bereits vakuumdicht verschweißt. Beim Start muß für genügend Feuchtigkeit im Raum gesorgt werden wegen des notwendigen Dampfdruckausgleiches. U. U. kann aber auch die Schweißung im abgeschlossenen Gehäuse erfolgen, indem den eingebauten Schweißbacken durch flexible Wellrohre o. ä. Spannung und Anpreßdruck zugeführt wird. Zur Beschleunigung der Abkühlung auf unter 1000 nach der Aufwärmung und gegebenenfalls einer vorgeschriebenen Verweilzeit werden die Wände mit Kühlmitteln gekühlt. Abb. 2 zeigt das Schema eines Durchlaufofens, dabei erscheint die Druckapparatur von der Schmalseite aus gesehen.Usually the objects are already vacuum-tight before treatment welded. When starting, sufficient moisture must be provided in the room because of the necessary vapor pressure equalization. Under certain circumstances, however, the weld can also be completed in the closed Housings are made by inserting the built-in welding jaws through flexible corrugated pipes or the like. Ä. Voltage and contact pressure is supplied. To speed up the cooling down less than 1000 after warming up and, if necessary, a prescribed dwell time the walls are cooled with coolants. Fig. 2 shows the scheme of a continuous furnace, the pressure apparatus appears to be seen from the narrow side.

Das Band 11 läuft im Takt, den der Ofenteil 12 vorgibt. In 13 wird das Objekt vorgewärmt, um die Verweilzeit in 12 abzukürzen. Das Bandmaterial wird so ausgewählt, daß es gleichzeitig auch zur Abdichtung der beiden Wandteile und der Fenster dient.The belt 11 runs at the rate specified by the furnace part 12. In 13 will the object preheated to shorten the dwell time in 12. The tape material will selected so that it also seals the two wall parts and at the same time the window serves.

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Claims (9)

Sterilisierung mit Mikrowellen Ansprüche 1.Verfahren und Anordnung zur Erwärmung von Objekten auf hohe Temperaturen mittels Mikrowellen, d a -d u r c h g e k e n n z e i c h n e t , daß das Objekt in einen druckdichten metallisch begrenzten Arbeitsraum wenig größer als das Objekt selbst eingesetzt und die HF-Energie durch ein oder mehrere druckdichte Fenster eingestrahlt wird. Microwave sterilization claims 1. method and arrangement for heating objects to high temperatures using microwaves, d a -d u r c h g e k e k e nn n n e i c h n e t that the object in a pressure-tight metallic limited work space slightly larger than the object itself and the RF energy used irradiated through one or more pressure-tight windows. 2. Verfahren und Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß zur besseren Energieverteilung der Arbeitsraum in Längsresonanz gebracht wird und der freie Abstand zu den Wänden nahe ß /4 so eingestellt wird, daB der Temperaturabfall nach den Seiten kompensiert wird.2. The method and arrangement according to claim 1, characterized in that that the work space is brought into longitudinal resonance for better energy distribution and the free distance to the walls close to ß / 4 is set so that the temperature drop is compensated on the sides. 3. Verfahren und Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwei Sender gleicher Frequenz und Amplitude im niederfrequenten Wechseltakt an je einem Ende des Raumes einstrahlen.3. The method and arrangement according to claim 1 or 2, characterized in that that two transmitters of the same frequency and amplitude in the low-frequency alternating cycle irradiate at one end of the room. 4. Verfahren und Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß über Druck- und/oder Temperatu'essung der Vorgang gesteuert wird.4. The method and arrangement according to one of claims 1 to 3, characterized characterized in that the process is controlled via pressure and / or temperature measurement will. 5. Verfahren und Anordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zur Sicherung genügenden Dampfdruckes in der Kammer zum Start eine kleine Dosis Wasser im Raum hinzufügt wird, die ebenfalls der MW-Erwärmung unterliegt.5. The method and arrangement according to one of claims 1 to 4, characterized characterized in that to ensure sufficient steam pressure in the chamber to start a small dose of water is added in the room, which also causes MW heating subject. 6. Verfahren und Anordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß zur raschen Abkühlung auf einen Sollwert nach Beendigung der Erhitzung und gegebenenfalls einer vorgegebenen Verharrungszeit die Wände des Arbeitsraumes aktiv.eekühlt werden.6. The method and arrangement according to one of claims 1 to 5, characterized characterized in that for rapid cooling to a target value after completion of the The walls of the work area are heated and, if necessary, the walls of the work room remain in place for a specified period of time active.be cooled. 7. Verfahren und Anordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das vakuumdichte Zuschweißen der Objekthülle im Arbeitsraum erfolgt, indem den eingebauten Schweißelektroden über flexible Wellrohre der Schweißstrom und Andruck zugeführt wird.7. The method and arrangement according to one of claims 1 to 6, characterized characterized in that the vacuum-tight welding of the object shell in the work area takes place by applying the welding current to the built-in welding electrodes via flexible corrugated tubes and pressure is supplied. 8. Verfahren und Anordnung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Förderband im Impulstakt läuft, der durch Druck oder Temperatur des Arbeitsraumes gesteuert wird.8. The method and arrangement according to one of claims 1 to 7, characterized characterized in that the conveyor belt runs in the pulse cycle, which is determined by pressure or temperature of the work area is controlled. 9. Verfahren und Anordnung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Band so ausgewählt wird, daß es gleichzeitig zur Abdichtung der beiden Wandhälften wie auch als dichter Fensterbelag dient.9. The method and arrangement according to one of claims 1 to 8, characterized characterized in that the tape is selected to be at the same time as the seal of the two halves of the wall as well as a tight window covering.
DE19833341585 1983-03-24 1983-11-17 Sterilisation using microwaves Withdrawn DE3341585A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE19833341585 DE3341585A1 (en) 1983-11-17 1983-11-17 Sterilisation using microwaves
DE8484108961T DE3478560D1 (en) 1983-08-10 1984-07-28 Method and device for the microwave heating of objects
AT84108961T ATE43773T1 (en) 1983-08-10 1984-07-28 METHOD AND DEVICE FOR HEATING OBJECTS BY MICROWAVES.
EP84108961A EP0136453B2 (en) 1983-08-10 1984-07-28 Method and device for the microwave heating of objects
US06/888,959 US4775770A (en) 1983-08-10 1986-07-24 System for heating objects with microwaves
US07/238,252 US4866233A (en) 1983-08-10 1988-08-30 System for heating objects with microwaves
US07/449,403 US4952763A (en) 1983-03-24 1989-12-19 System for heating objects with microwaves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833341585 DE3341585A1 (en) 1983-11-17 1983-11-17 Sterilisation using microwaves

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DE3341585A1 true DE3341585A1 (en) 1985-05-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3418843A1 (en) * 1984-05-21 1985-11-28 Karl Dr. 7800 Freiburg Fritz Microwave method
DE3505571A1 (en) * 1985-02-18 1986-08-21 GVB SANIMED Hygiene- und Medizintechnik GmbH, 3070 Nienburg Device and method of disinfecting and sterilising mattresses by means of microwaves
DE3639412A1 (en) * 1986-11-18 1988-06-16 Aro Lab Pasteurisation and sterilisation of pulverulent and lumpy foods, spices and medicaments as well as stimulants by means of high frequency or ultrahigh frequency
DE3904111A1 (en) * 1989-02-11 1990-08-16 Battelle Institut E V METHOD AND DEVICE FOR THE ENVIRONMENTALLY FRIENDLY MASS DEIFICATION OF BOOKS AND OTHER PAPER PRODUCTS
DE4040477C1 (en) * 1990-12-18 1992-01-16 Gerresheimer Glas Ag, 7590 Achern, De Sterilising hollow glass vessels by microwave radiation - involves drying of glass surface prior to microwave irradiation
US5122633A (en) * 1989-06-07 1992-06-16 Wolfgang Moshammer Method and apparatus for radiation microwave energy into material containing water or mixed with water
EP0827678A1 (en) * 1995-05-22 1998-03-11 Wintex, Corp. Microwave pressure vessel and method of sterilization
EP3169141A1 (en) * 2015-11-13 2017-05-17 Bottle-Top Development Co. Microwave heating system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505490A (en) * 1966-10-07 1970-04-07 Raytheon Co Apparatus for thawing of frozen materials
US3809844A (en) * 1970-09-08 1974-05-07 Alfa Laval Ab Method and apparatus for treating heat-sensitive products
DE2451852A1 (en) * 1973-11-06 1975-05-07 Int Standard Electric Corp HEAT TREATMENT DEVICE
DE2712448A1 (en) * 1977-03-22 1978-09-28 Karl Dr Fritz Microwave sterilisation of food - using very steep microwave pulses of short mark to space ratio
DE3002632A1 (en) * 1980-01-25 1981-07-30 Karl Dr. 7800 Freiburg Fritz Microwave heater with two pairs of windows - radiates waves of specified relative phases and polarisations
US4409454A (en) * 1980-02-19 1983-10-11 Beauvais Max P Microwave canning apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505490A (en) * 1966-10-07 1970-04-07 Raytheon Co Apparatus for thawing of frozen materials
US3809844A (en) * 1970-09-08 1974-05-07 Alfa Laval Ab Method and apparatus for treating heat-sensitive products
DE2451852A1 (en) * 1973-11-06 1975-05-07 Int Standard Electric Corp HEAT TREATMENT DEVICE
DE2712448A1 (en) * 1977-03-22 1978-09-28 Karl Dr Fritz Microwave sterilisation of food - using very steep microwave pulses of short mark to space ratio
DE3002632A1 (en) * 1980-01-25 1981-07-30 Karl Dr. 7800 Freiburg Fritz Microwave heater with two pairs of windows - radiates waves of specified relative phases and polarisations
US4409454A (en) * 1980-02-19 1983-10-11 Beauvais Max P Microwave canning apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3418843A1 (en) * 1984-05-21 1985-11-28 Karl Dr. 7800 Freiburg Fritz Microwave method
DE3505571A1 (en) * 1985-02-18 1986-08-21 GVB SANIMED Hygiene- und Medizintechnik GmbH, 3070 Nienburg Device and method of disinfecting and sterilising mattresses by means of microwaves
DE3639412A1 (en) * 1986-11-18 1988-06-16 Aro Lab Pasteurisation and sterilisation of pulverulent and lumpy foods, spices and medicaments as well as stimulants by means of high frequency or ultrahigh frequency
DE3904111A1 (en) * 1989-02-11 1990-08-16 Battelle Institut E V METHOD AND DEVICE FOR THE ENVIRONMENTALLY FRIENDLY MASS DEIFICATION OF BOOKS AND OTHER PAPER PRODUCTS
US5120500A (en) * 1989-02-11 1992-06-09 Battelle-Institue E.V. Process and device for nonpolluting mass deacidification of books and other paper products
US5122633A (en) * 1989-06-07 1992-06-16 Wolfgang Moshammer Method and apparatus for radiation microwave energy into material containing water or mixed with water
DE4040477C1 (en) * 1990-12-18 1992-01-16 Gerresheimer Glas Ag, 7590 Achern, De Sterilising hollow glass vessels by microwave radiation - involves drying of glass surface prior to microwave irradiation
EP0827678A1 (en) * 1995-05-22 1998-03-11 Wintex, Corp. Microwave pressure vessel and method of sterilization
EP0827678A4 (en) * 1995-05-22 1999-03-03 Wintex Corp Microwave pressure vessel and method of sterilization
EP3169141A1 (en) * 2015-11-13 2017-05-17 Bottle-Top Development Co. Microwave heating system

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