US3402277A - Microwave treating device - Google Patents

Microwave treating device Download PDF

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Publication number
US3402277A
US3402277A US584913A US58491366A US3402277A US 3402277 A US3402277 A US 3402277A US 584913 A US584913 A US 584913A US 58491366 A US58491366 A US 58491366A US 3402277 A US3402277 A US 3402277A
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US
United States
Prior art keywords
tunnel
microwave
planes
bounding
vertical
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.)
Expired - Lifetime
Application number
US584913A
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English (en)
Inventor
Muller Paul Curt
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.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
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 Patelhold Patenverwertungs and Elektro-Holding AG filed Critical Patelhold Patenverwertungs and Elektro-Holding AG
Application granted granted Critical
Publication of US3402277A publication Critical patent/US3402277A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H05B6/78—Arrangements for continuous movement of material
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
    • A21B2/00—Baking apparatus employing high-frequency or infrared heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects

Definitions

  • the invention relates to a micro-wave treatment tunnel wherein the goods to be treated, for example pulverulent or granular material or piece goods, are passed through the heating zone with the aid of a conveyor belt.
  • microwave treatment tunnels wherein a hollow guide of substantially rectangular cross-section, through which the goods being treated are passed, is fed with microwave energy, with the result that hollow-guide Waves are excited in a definite mode or at most in one of a few modes.
  • Such a treatment tunnel has the disadvantage that the load .which it presents to the microwaves fed into it depends to a very marked extent on the type and dimen sions of the goods introduced for treatment.
  • a further disadvantage resides in that a plurality of generators cannot be operated in parallel on account of the difliculty of decoupling by simple means.
  • the object of the invention is to provide a microwave treatment tunnel wherein these disadvantages are to a large extent avoided.
  • the microwave treatment tunnel according to the invention is characterized in that the planes which bound it are arranged in pairs at a distance from one another of at least double the length of the microwaves in free space, in that the tunnel member comprises four further oblique internal bounding planes which are not parallel to one another, each linking one horizontal and one vertical bounding plane and being at an include-d angle of 20- 70 to the vertical, and in that the microwave feed takes place across a plurality of cross sections of the tunnel member, in such a way that the mean direction of the density of energy flow fed in is diflerent at least for neighbouring feed cross-sections.
  • FIG. 1 is a cross-sectional view of one form of device made according to the invention.
  • FIG. 2 is a cross-sectional view, similar to FIG. 1 but shown without the conveyor belt, of another form of device rnade according to the invention.
  • FIG. 3 is a plan view of the device of FIG. 2.
  • FIG. 1 Sil'lOWS a section through a first variant.
  • the tubular tunnel member 1 is of octagonal cross-section.
  • a conveyor belt of which the forward and return runs 3 and 4 respectively are supported by freely rotatable nonmetallic rollers 5, 6, serves to convey the goods 2 being treated through the tunnel.
  • Feed takes place across four different cross-sections of the tunnel via hollow guides 7 10 which are flanged on to the tunnel member 1.
  • Each of the hollow guides receives microwave energy from an associated microwave generator (not shown) via an input coupling 11, for example, for the purpose of forming an H wave, and delivers it through a feed aperture, for example 12, into the treatment tunnel.
  • Teflon plates 12' are clamped between the flanges of the hollow guides and the tunnel member 1 in order to prevent the hollow guides from becoming dirty.
  • the cross-sectional dimensions of the tunnel are so chosen that the microwaves fed in are propagated in a manner similar to that in free space. This is achieved as a result of the fact that its horizontal and vertical dimensions are at least double the length of the microwaves in free space (A).
  • the oblique bounding planes which are not parallel to one another produce a large number of reflections, with the result that the field of radiation is to a large extent isotropic.
  • the four feed apertures are arranged offset along a spiral across four different oblique planes bounding the tunnel.
  • the mean direction of the density of energy flow fed in is thus diiferent for two neighbouring (feeds.
  • the freely rotatable rollers 5, 6 are mounted in the vertical walls of the tunnel member.
  • the lower oblique bounding planes are less steep than the upper ones as indicated by the angle or exceeding the angle 5 in the drawing.
  • the two pairs of opposite walls 1a, 1b and 1c, 1d of the tunnel 1 are parallel to one another, while the pairs of opposite :walls 1g, 111 and 1e, 1 form acute angles with one another.
  • the variant in FIGURE 1 has the advantage of being particularly simple in construction.
  • the directions of oscillation are all substantially parallel to the cross-sectional planes, as shown by arrows a in FIGURE 1. It has been found that sufficiently good decoupling is attained with this variant in most cases.
  • the hollow guides may be so arranged that the included angles between the electric field strengths and the cross-sectional planes are different for two neighbouring feeds.
  • FIGURES 2 and 3 show the tunnel member 1 with flanged'on hollow guides 13-16 in section and plan.
  • the feed apertures are arranged in the horizontal and vertical planes bounding the tunnel member.
  • the hollow guides 13 and 15 are bent obliquely to one side in order to provide favourable accommodation for the generators.
  • the feed apertures are provided with polarising grids which are clamped together with the Teflon cover plates between the flanges of the hollow guides and the tunnel member.
  • a transformation plate 17 may be fitted inside the tunnel in front of each of one or more feed apertures. These transformation plates, which are at a distance of less than 4 from the wall of the tunnel, cause the microwave energy to enter the tunnel substantially at a tangent.
  • Microwave treatment tunnel with an endless conveyor belt which is guided through an electrically conductive tunnel member having two horizontal and two 3 vertical inner bounding planes, characterized in that these bounding planes are arranged in pairs at a distance from one another of at least double the length of the microwaves in free space, in that the tunnel member (1) comprises four further oblique internal bounding planes which are not parallel to one another, each linking one horizontal and one vertical bounding plane and being at an included angle of 20-70 to the vertical, and in that the microwave feed takes place across a plurality of crosssections of the tunnel member, in such a way that the mean direction of the density of energy flow fed in is different at least for neighbouring feed cross-sections.
  • Microwave treatment tunnel characterized in that the return run of the conveyor belt (4) takes place inside the tunnel member, and in that the conveyor belt (3, 4) is supported by a plurality of freely rotatable non-metallic rollers (5, 6) arranged in two horizontal planes and extending transversely across the tunnel.
  • Microwave treatment tunnel according to claim 1 characterized in that for each feed there is a microwave generator from which the microwave energy is passed via a hollow guide to a feed aperture in the tunnel member.
  • Microwave treatment tunnel according liO claim 3 characterized in that the feed apertures for neighbouring feed crosssections are arranged in two different oblique internal planes bounding the tunnel member.
  • Microwave treatment tunnel according to claim 3 characterized in that for the flow of energy fed in the in cluded angles between the electric field strengths and the cross-sectional planes are dilferent for two neighbouring feeds.
  • Microwave treatment tunnel according to claim 5 characterized in that at least one feed aperture is provided with a polarising grid.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Molecular Biology (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Food Science & Technology (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US584913A 1965-10-25 1966-10-06 Microwave treating device Expired - Lifetime US3402277A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1469765A CH426051A (de) 1965-10-25 1965-10-25 Mikrowellenbehandlungstunnel

Publications (1)

Publication Number Publication Date
US3402277A true US3402277A (en) 1968-09-17

Family

ID=4403097

Family Applications (1)

Application Number Title Priority Date Filing Date
US584913A Expired - Lifetime US3402277A (en) 1965-10-25 1966-10-06 Microwave treating device

Country Status (5)

Country Link
US (1) US3402277A (fr)
BE (1) BE688783A (fr)
CH (1) CH426051A (fr)
FR (1) FR1499628A (fr)
NL (1) NL6611685A (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597565A (en) * 1969-04-17 1971-08-03 Cryodry Corp Waveguide applicator and method
US3666905A (en) * 1969-04-25 1972-05-30 Messrs Paul Troester Maschinen Method and apparatus for dielectric heating
US4133997A (en) * 1977-02-09 1979-01-09 Litton Systems, Inc. Dual feed, horizontally polarized microwave oven
US4160144A (en) * 1978-01-25 1979-07-03 Canadian Patents And Development Limited Single-sided microwave applicator for sealing cartons
US4163141A (en) * 1976-04-14 1979-07-31 Matsushita Electric Industrial Co., Ltd. Microwave oven
US4246462A (en) * 1975-10-09 1981-01-20 Nicolas Meisel Microwave tunnel oven for the continuous processing of food products
EP0069105A1 (fr) * 1981-06-29 1983-01-05 De Belgische Staat L'Etat Belge représenté par le Secrétaire général des Services de Programmation Four industriel modulaire à micro-ondes
FR2525063A1 (fr) * 1982-04-10 1983-10-14 Toyoda Gosei Kk
WO1987007812A1 (fr) * 1986-06-05 1987-12-17 Nearctic Research Centre (Australia) Pty Limited Cavite a micro-ondes a modes multiples
EP0287549A1 (fr) * 1987-04-14 1988-10-19 Helmut Dr. Katschnig Dispositif pour chauffer des objets et des organismes
US4866233A (en) * 1983-08-10 1989-09-12 Snowdrift Corporation N.V. System for heating objects with microwaves
AU597997B2 (en) * 1986-06-05 1990-06-14 Nearctic Research Centre (Australia) Limited Resonant cavity microwave drier
US5015813A (en) * 1988-12-14 1991-05-14 Mitsubishi Denki Kabushiki Kaisha Power feeding port arrangement for a microwave heating apparatus
EP0551911A2 (fr) * 1992-01-17 1993-07-21 Moulinex S.A. Machine de décongélation et de réchauffage d'une préparation alimentaire surgelée, et procédé de chauffage s'y rapportant
US5250772A (en) * 1992-09-21 1993-10-05 Wisconsin Alumni Research Foundation Microwave furnace with uniform power distribution
FR2722951A1 (fr) * 1994-07-29 1996-02-02 Maillard De Etienne Dispositif de traitement de patons en vue de leur allongement
US5844217A (en) * 1996-07-03 1998-12-01 Board Of Trustees Operating Michigan State University Appratus for liquid thermosetting resin molding using radiofrequency wave heating
US20040131519A1 (en) * 2002-10-18 2004-07-08 Pagotto Amedeo Tunnel for conditioning of products, especially for sterilization of food in prepackaged containers
US20110155725A1 (en) * 2008-09-03 2011-06-30 Emite Ingenieria, Slne Multiple input, multiple output analyser
US9066376B2 (en) 2012-03-14 2015-06-23 Microwave Materials Technologies, Inc. Locking gate device
US10966293B2 (en) 2017-04-17 2021-03-30 915 Labs, LLC Microwave-assisted sterilization and pasteurization system using synergistic packaging, carrier and launcher configurations
US11032879B2 (en) 2017-03-15 2021-06-08 915 Labs, Inc. Energy control elements for improved microwave heating of packaged articles
US11129243B2 (en) 2017-03-15 2021-09-21 915 Labs, Inc. Multi-pass microwave heating system

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH426051A (de) * 1965-10-25 1966-12-15 Patelhold Patentverwertung Mikrowellenbehandlungstunnel
DE3120900A1 (de) * 1981-05-26 1983-06-16 Karl Dr. 7800 Freiburg Fritz Mikrowellen-arbeitsraum
DE3926363A1 (de) * 1989-08-10 1991-02-14 Reinhard Schulze Verfahren und einrichtung zur waermebehandlung von gemischen organischer substanzen und zugehoerige anwendung
FR2651874B1 (fr) * 1989-09-08 1994-11-18 Cinema Magnetique Comm Dispositif de sechage par micro-ondes de pieces de bois notamment de pieces de bois composites collees.
FR2661978A1 (fr) * 1990-05-14 1991-11-15 Marzat Claude Procede et dispositif de sechage rapide d'un materiau pouvant etre fragile par application de micro-ondes.
DE4328086A1 (de) * 1993-08-20 1995-02-23 Bosch Siemens Hausgeraete Anordnung zur Durchführung eines Trocknungsverfahrens
FR2722638B1 (fr) * 1994-07-13 1996-10-04 Marzat Claude Dispositif applicateur de micro-ondes notamment pour la cuisson de produits sur un support metallique
GB9511748D0 (en) * 1995-06-09 1995-08-02 Cobalt Systems Limited Oven
JP2000503452A (ja) * 1996-01-19 2000-03-21 ベリン―リュ．ビスキュイ．フランス マイクロ波を印加するための装置、特に金属支持体上で製品を調理するための装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814708A (en) * 1952-01-05 1957-11-26 Raytheon Mfg Co Microwave ovens
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
CH426051A (de) * 1965-10-25 1966-12-15 Patelhold Patentverwertung Mikrowellenbehandlungstunnel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2814708A (en) * 1952-01-05 1957-11-26 Raytheon Mfg Co Microwave ovens
US3196242A (en) * 1961-10-25 1965-07-20 Philips Corp High-frequency oven door seal
CH426051A (de) * 1965-10-25 1966-12-15 Patelhold Patentverwertung Mikrowellenbehandlungstunnel

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3597565A (en) * 1969-04-17 1971-08-03 Cryodry Corp Waveguide applicator and method
US3666905A (en) * 1969-04-25 1972-05-30 Messrs Paul Troester Maschinen Method and apparatus for dielectric heating
US4246462A (en) * 1975-10-09 1981-01-20 Nicolas Meisel Microwave tunnel oven for the continuous processing of food products
US4163141A (en) * 1976-04-14 1979-07-31 Matsushita Electric Industrial Co., Ltd. Microwave oven
US4133997A (en) * 1977-02-09 1979-01-09 Litton Systems, Inc. Dual feed, horizontally polarized microwave oven
US4160144A (en) * 1978-01-25 1979-07-03 Canadian Patents And Development Limited Single-sided microwave applicator for sealing cartons
EP0069105A1 (fr) * 1981-06-29 1983-01-05 De Belgische Staat L'Etat Belge représenté par le Secrétaire général des Services de Programmation Four industriel modulaire à micro-ondes
FR2525063A1 (fr) * 1982-04-10 1983-10-14 Toyoda Gosei Kk
US4952763A (en) * 1983-03-24 1990-08-28 Snowdrift Corp. N.V. System for heating objects with microwaves
US4866233A (en) * 1983-08-10 1989-09-12 Snowdrift Corporation N.V. System for heating objects with microwaves
US4908486A (en) * 1986-06-05 1990-03-13 Nearctic Research Centre Resonant cavity of a microwave drier
AU597997B2 (en) * 1986-06-05 1990-06-14 Nearctic Research Centre (Australia) Limited Resonant cavity microwave drier
WO1987007812A1 (fr) * 1986-06-05 1987-12-17 Nearctic Research Centre (Australia) Pty Limited Cavite a micro-ondes a modes multiples
EP0287549A1 (fr) * 1987-04-14 1988-10-19 Helmut Dr. Katschnig Dispositif pour chauffer des objets et des organismes
US5098665A (en) * 1987-04-14 1992-03-24 Helmut Katschnig Device for heating of articles and organisms
US5015813A (en) * 1988-12-14 1991-05-14 Mitsubishi Denki Kabushiki Kaisha Power feeding port arrangement for a microwave heating apparatus
EP0551911A2 (fr) * 1992-01-17 1993-07-21 Moulinex S.A. Machine de décongélation et de réchauffage d'une préparation alimentaire surgelée, et procédé de chauffage s'y rapportant
FR2686401A1 (fr) * 1992-01-17 1993-07-23 Moulinex Sa Machine de decongelation et de rechauffage d'une preparation alimentaire surgelee, et procede de chauffage s'y rapportant.
EP0551911A3 (fr) * 1992-01-17 1994-04-06 Moulinex Sa
US5250772A (en) * 1992-09-21 1993-10-05 Wisconsin Alumni Research Foundation Microwave furnace with uniform power distribution
FR2722951A1 (fr) * 1994-07-29 1996-02-02 Maillard De Etienne Dispositif de traitement de patons en vue de leur allongement
US5844217A (en) * 1996-07-03 1998-12-01 Board Of Trustees Operating Michigan State University Appratus for liquid thermosetting resin molding using radiofrequency wave heating
US20040131519A1 (en) * 2002-10-18 2004-07-08 Pagotto Amedeo Tunnel for conditioning of products, especially for sterilization of food in prepackaged containers
US9307784B2 (en) 2002-10-18 2016-04-12 Teo, Inc. Tunnel for conditioning of products, especially for sterilization of food in prepackaged containers
US7993603B2 (en) * 2002-10-18 2011-08-09 Pagotto Amedeo Tunnel for conditioning of products, especially for sterilization of food in prepackaged containers
US8372350B2 (en) 2002-10-18 2013-02-12 Pagotto Amedeo Tunnel for conditioning of products, especially for sterilization of food in prepackaged containers
US8872080B2 (en) * 2008-09-03 2014-10-28 Emite Ingenieria, Slne Multiple input, multiple output analyser
US20110155725A1 (en) * 2008-09-03 2011-06-30 Emite Ingenieria, Slne Multiple input, multiple output analyser
US9357589B2 (en) 2012-03-14 2016-05-31 Microwave Materials Technologies, Inc. Commercial scale microwave heating system
US9642195B2 (en) 2012-03-14 2017-05-02 Microwave Materials Technologies, Inc. Enhanced microwave system utilizing tilted launchers
US9301345B2 (en) 2012-03-14 2016-03-29 Microwave Materials Technologies, Inc. Determination of a heating profile for a large-scale microwave heating system
US9179505B2 (en) 2012-03-14 2015-11-03 Microwave Materials Technologies, Inc. Optimized motion and location of intense microwave fields within a heating system
US9357590B2 (en) 2012-03-14 2016-05-31 Microwave Materials Technologies, Inc. Microwave heating system with enhanced temperature control
US9066376B2 (en) 2012-03-14 2015-06-23 Microwave Materials Technologies, Inc. Locking gate device
US9370052B2 (en) 2012-03-14 2016-06-14 Microwave Materials Technologies, Inc. Optimized allocation of microwave power in multi-launcher systems
US9380650B2 (en) 2012-03-14 2016-06-28 915 Labs, LLC Multi-line microwave heating system with optimized launcher configuration
US9622298B2 (en) 2012-03-14 2017-04-11 Microwave Materials Technologies, Inc. Microwave launchers providing enhanced field uniformity
US9271338B2 (en) 2012-03-14 2016-02-23 Microwave Materials Technologies, Inc. Pressurized heating system with enhanced pressure locks
US9681500B2 (en) 2012-03-14 2017-06-13 Microwave Materials Technologies, Inc. Enhanced microwave system employing inductive iris
US9980325B2 (en) 2012-03-14 2018-05-22 Microwave Materials Technologies, Inc. Enhanced control of a microwave heating system
US10448465B2 (en) 2012-03-14 2019-10-15 915 Labs, LLC Multi-line microwave heating system with optimized launcher configuration
US10798790B2 (en) 2012-03-14 2020-10-06 Microwave Materials Technologies, Inc. Enhanced microwave system utilizing tilted launchers
US11032879B2 (en) 2017-03-15 2021-06-08 915 Labs, Inc. Energy control elements for improved microwave heating of packaged articles
US11129243B2 (en) 2017-03-15 2021-09-21 915 Labs, Inc. Multi-pass microwave heating system
US10966293B2 (en) 2017-04-17 2021-03-30 915 Labs, LLC Microwave-assisted sterilization and pasteurization system using synergistic packaging, carrier and launcher configurations

Also Published As

Publication number Publication date
NL6611685A (fr) 1967-04-26
CH426051A (de) 1966-12-15
BE688783A (fr) 1967-03-31
FR1499628A (fr) 1967-10-27

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