WO1987004314A1 - Applicateur a microondes - Google Patents

Applicateur a microondes Download PDF

Info

Publication number
WO1987004314A1
WO1987004314A1 PCT/SE1986/000587 SE8600587W WO8704314A1 WO 1987004314 A1 WO1987004314 A1 WO 1987004314A1 SE 8600587 W SE8600587 W SE 8600587W WO 8704314 A1 WO8704314 A1 WO 8704314A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
bodies
applicator
nozzle
metallic core
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.)
Ceased
Application number
PCT/SE1986/000587
Other languages
English (en)
Inventor
Sven Ekerot
Jan Svennebrink
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.)
Stiftelsen Institutet for Mikrovagsteknik Vid Tekniska Hogskolan
Original Assignee
Stiftelsen Institutet for Mikrovagsteknik Vid Tekniska Hogskolan
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 Stiftelsen Institutet for Mikrovagsteknik Vid Tekniska Hogskolan filed Critical Stiftelsen Institutet for Mikrovagsteknik Vid Tekniska Hogskolan
Publication of WO1987004314A1 publication Critical patent/WO1987004314A1/fr
Anticipated expiration legal-status Critical
Ceased 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

Definitions

  • the present invention relates to a microwave applicator for heating primarily bodies which are substantially of elongated configuration and which incorporate dielectric material.
  • the present invention affords a solution, inter alia, to the aforesaid problems and greatly increases the fields or areas in which microwaves can be suitably used for heating purposes.
  • the invention relates to a microwave applicator which is intended for heating primarily elongated bodies which incorporate a dielectric material and by means of which there is formed a microwave cavity through which such bodies are intended to pass, or within which at least one such body is intended to be present.
  • the microwave applicator according to the invention is particularly characterized in that it is constructed so that both bodies which contain a metallic core and bodies which lack a metallic core can be heated therewith, there being used to this end mutually different oscillating modes according to the presence or absence of a metallic core.
  • Figure 1 is a schematic view of a microwave applicator seen at right angles to its main axis
  • Figure 2 is a bottom view of the applicator illustrated in Figure 1 ;
  • Figure 3 is a schematic vertical, axial sectional view of a second embodiment of an applicator arrangement according to the invention.
  • Figure 4 is a schematic vertical, axial sectional view of a third embodiment of an applicator arrangement according to the invention.
  • Figure 1 illustrates a microwave applicator 1 for heating elongated bodies 2 that incorporate dielectric material.
  • a micro ⁇ wave cavity 3 which has a substantially circular cross- section in a plane at right angles to the longitudinal axis of said body 2.
  • the applicator has two end portions 5 in which apertures 4 are provided.
  • the reference 6 iden ⁇ tifies a waveguide which extends substantially radially into the cavity, for supplying microwaves thereto.
  • the applicator 1 is constructed in a manner which enables both bodies that incorporate a metallic core, shown in broken lines 2' in Figure 1 , and bodies which have no metallic core to be heated, the length or axial extension of the cavity corresponding essentially to half the wave ⁇ length of the intended microwaves.
  • the cavity is designed to oscillate in a co-axial mode when heating a body that incorporates a metallic core, and oscillates in a cylindrical mode, preferably TM 010, the resonance frequency of which is independent of the length or axial extension of the cavity, while the diameter is determined by the resonance frequency. In this case both the diameter and the length are therefore determined by the two oscillating modes per se.
  • the cylindrical mode JM 010 is sometimes written as TM Q1Q .
  • the cavity 7 formed by the applicator 6 of the Figure 3 embodiment is intended for heating a so-called nozzle or die8 through which metal 9 is intended to run, the nozzle in this case forming the aforesaid elongated body.
  • the nozzle or die to be heated can be used for various purposes, as hereinafter described.
  • FIG. 3 there is illustrated a container vessel 10 having an opening 11 with which the nozzle 8 communicates, said nozzle being encased in and surrounded by a ceramic material 12, which preferably exhibits but a very small loss factor, e.g. Al 2 0_, .
  • a ceramic material 12 which preferably exhibits but a very small loss factor, e.g. Al 2 0_, .
  • parts of the cavity are formed by metal ⁇ lic sections 13, such as the sections 13 of a metallic net, for instance a network of platinum filaments or threads, embedded in or encased by the ceramic material surrounding the nozzle.
  • the cavity of the illustrated embodiment has a downwardly widening metallic part 14.
  • Microwaves are supplied to the cavity 7 with the aid of a waveguide 6* which extends substantial- ly radially to the cavity 7, said cavity, formed by sections 13 and 14, having a substantially cylindrical cross-sectional shape.
  • the nozzle 8 has a freely outwardly extending part 16 which protrudes down from the opening 11 of a container vessel 10.
  • the applicator 17 of this embodiment is arranged to form a cavity 18 of substantially cylindrical cross-section, the part 16 of the nozzle 8 extending into said cavity.
  • the reference 17' identifies a waveguide corresponding to the waveguide 6 of the Figure 3 embodiment.
  • Both the applicator illustrated in Figure 3 and the ap ⁇ plicator illustrated in Figure 4 are constructed in the manner of the applicator illustrated in Figures 1 and 2, i.e. in a manner which enables the elongated body 2 to be heated irrespective of whether it incorporates a metallic core 2* or not.
  • Nozzles of the kind intended here are suitably made of a ceramic material, suitably a ceramic material such as zirconium dioxide Zr0 2 , which exhibits substantial loss factors with regard to microwaves.
  • Nozzles intended to be heated with the aid of an appli ⁇ cator constructed in accordance with the invention can be used in a multiple of fields.
  • One field in this regard is that of heating a dielectric material such as a plastics material, which either incor- porates or lacks a metallic core, during transport of the material through the applicator.
  • the material may com ⁇ prise, for example, a plastic coating on a ski-stick.
  • a further field is one in which some part, either the di- electric or the metal core, remains stationary in the ap- plicator. This may apply in the manufacturing of tubing, piping, or some other hollow profile.
  • the same appli ⁇ cator can be used herewith for manufacturing correspond ⁇ ing homogenous profiles.
  • Another field is the direct casting of wire in which the nozzle or die is stationary in relation to the applicator, substantially in accordance with Swedish Patent (8003487-9), heating of the die preferably being effected both as a pre-heating mea ⁇ sure prior to introducing molten material thereinto and as a back-up heating measure during a molding or casting operation, therewith to control the nozzle or die temper ⁇ ature, for example in order to prevent blockages occurring in the nozzle.
  • the reference 9' in Figure 3 identifies a stabilizing wire which extends through the nozzle.
  • the invention can also be applied to heat a die or nozzle, both pre-heat and back-up heat, during more general cast ⁇ ing or molding processes, such as continuous casting pro ⁇ Des.
  • the material 12, 10 surrounding the nozzle or die is often preferred to ex- hibit extremely small loss factors, as opposed to the material from which the nozzle or die is made.
  • Another field in which the invention can be applied is the heating and heat-retention of nozzles or dies used as tools in, for instance, wire drawing processes.
  • Still another field is the heating of nozzles or dies and the material passing therethrough, this material, such as plastic, being pressed through the die or nozzle or caus ⁇ ed to flow therethrough in some other way.
  • the manner in which the microwave applicator according to the invention operates will be understood in all essen ⁇ tials from the aforegoing.
  • the applicator when suitably con- structed the applicator will form a cavity which oscil- lates in a given mode when used in conjunction with ma ⁇ terial having a metal core, and in a different given mode when used in conjunction with material that lacks a metal core, for example a coaxial mode in the former case and a cylindrical mode in the latter case.
  • micro ⁇ wave applicator constructed in accordance with the in ⁇ vention will afford important advantages over prior art applicators.
  • the applicator according to the invention is more flexible with regard to its use.
  • one and the same applicator can be switched instanta ⁇ neously between pre-heating and back-up heating opera ⁇ tional modes.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

Applicateur à micro-ondes pour chauffer des corps (2) dont la configuration est sensiblement allongée et qui incorporent un matériau diéléctrique. L'applicateur présente la forme d'une cavité (3) à micro-ondes à travers laquelle des corps sont transportés ou dans laquelle au moins un corps est présent. L'applicateur (1) à micro-ondes est surtout caractérisé en ce qu'il est conçu pour chauffer des corps (2) pourvu d'un coeur métallique (2') ainsi que des corps sans coeur métallique. Les modes d'oscillation sont différents selon qu'il s'agit d'un corps avec ou sans coeur métallique.
PCT/SE1986/000587 1985-12-30 1986-12-29 Applicateur a microondes Ceased WO1987004314A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8506159A SE451228B (sv) 1985-12-30 1985-12-30 Mikrovagsapplikator for verming av fremst vesentligen strengformade eller langstreckta kroppar
SE8506159-6 1985-12-30

Publications (1)

Publication Number Publication Date
WO1987004314A1 true WO1987004314A1 (fr) 1987-07-16

Family

ID=20362618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000587 Ceased WO1987004314A1 (fr) 1985-12-30 1986-12-29 Applicateur a microondes

Country Status (3)

Country Link
JP (1) JPS63503338A (fr)
SE (1) SE451228B (fr)
WO (1) WO1987004314A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998035532A1 (fr) * 1997-02-10 1998-08-13 California Institute Of Technology Traitement par lots uniforme au moyen de micro-ondes
WO2003050345A3 (fr) * 2001-12-06 2004-04-15 Du Pont Procede pour conferer la permanence de forme a un materiau fibreux non thermoplastique façonne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3381547A1 (fr) * 2017-03-30 2018-10-03 Canon Medical Systems Corporation Appareil de test d'échantillons

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2326053A1 (fr) * 1975-09-24 1977-04-22 Cit Alcatel Transition hyperfrequence
DE2642336B1 (de) * 1976-09-21 1978-01-26 Purfuerst Kg Ing Buero Vorrichtung zum kontinuierlichen dielektrischen erwaermen mittels mikrowellenenergie
EP0014121A1 (fr) * 1979-01-22 1980-08-06 JD-Technologie AG Appareil de chauffage à micro-ondes
FR2548507A1 (fr) * 1983-06-28 1985-01-04 Lambda Technics Int Applicateur a micro-ondes, a densite d'energie ajustable, destine au traitement d'objets au moins en partie polaires

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2326053A1 (fr) * 1975-09-24 1977-04-22 Cit Alcatel Transition hyperfrequence
DE2642336B1 (de) * 1976-09-21 1978-01-26 Purfuerst Kg Ing Buero Vorrichtung zum kontinuierlichen dielektrischen erwaermen mittels mikrowellenenergie
EP0014121A1 (fr) * 1979-01-22 1980-08-06 JD-Technologie AG Appareil de chauffage à micro-ondes
FR2548507A1 (fr) * 1983-06-28 1985-01-04 Lambda Technics Int Applicateur a micro-ondes, a densite d'energie ajustable, destine au traitement d'objets au moins en partie polaires

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998035532A1 (fr) * 1997-02-10 1998-08-13 California Institute Of Technology Traitement par lots uniforme au moyen de micro-ondes
US6034363A (en) * 1997-02-10 2000-03-07 California Institute Of Technology Uniform batch processing using microwaves
WO2003050345A3 (fr) * 2001-12-06 2004-04-15 Du Pont Procede pour conferer la permanence de forme a un materiau fibreux non thermoplastique façonne

Also Published As

Publication number Publication date
SE8506159D0 (sv) 1985-12-30
SE451228B (sv) 1987-09-14
SE8506159L (sv) 1987-07-01
JPS63503338A (ja) 1988-12-02

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