EP0484210A1 - Hochfrequenzresonanz oder Mikrowellenapplikator zur thermischen Behandlung von kontinuierlich bewegendem Bandmaterial - Google Patents

Hochfrequenzresonanz oder Mikrowellenapplikator zur thermischen Behandlung von kontinuierlich bewegendem Bandmaterial Download PDF

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Publication number
EP0484210A1
EP0484210A1 EP91402846A EP91402846A EP0484210A1 EP 0484210 A1 EP0484210 A1 EP 0484210A1 EP 91402846 A EP91402846 A EP 91402846A EP 91402846 A EP91402846 A EP 91402846A EP 0484210 A1 EP0484210 A1 EP 0484210A1
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EP
European Patent Office
Prior art keywords
capacitor
plate
applicator
acting
metal strip
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.)
Granted
Application number
EP91402846A
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English (en)
French (fr)
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EP0484210B1 (de
Inventor
Georges Roussy
Bertrand Meyer
Jean-François Rochas
Christophe Debard
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.)
Institut Francais Textile et Habillement
Original Assignee
Institut Francais Textile et Habillement
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Publication of EP0484210A1 publication Critical patent/EP0484210A1/de
Application granted granted Critical
Publication of EP0484210B1 publication Critical patent/EP0484210B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/46—Dielectric heating
    • H05B6/54—Electrodes
    • 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
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material

Definitions

  • the present invention relates to a high-frequency or microwave resonant applicator, that is to say a device capable of applying electromagnetic radiation in the frequency range of high frequencies or microwaves to a planar material in movement. continuous, in particular a textile material, a paper or a nonwoven. It relates more particularly to an applicator comprising a capacitor between the plates from which the planar material moves.
  • An applicator of this type is supplied by a generator whose operating parameters are imposed by the manufacturer. To obtain sufficient stability conditions, it is always necessary to have between the generator supplying the electromagnetic energy and the applicator an additional electromagnetic circuit, commonly called adapter box. Most often these adapter boxes are made up of inductors and capacitors and do not include resistive elements which are capable of dissipating heat and therefore reduce the total energy efficiency of the installation.
  • the aim which the applicant has set for himself is to propose an applicator which overcomes all the drawbacks noted, in that it makes it possible to obtain uniformity of treatment in the transverse direction of the material and in that it is self-contained. regulating, that is to say that it corrects by itself the conditions of its operation due to variations in the characteristics of the material to be treated.
  • the inductor constitutes with the capacity of the planar capacitor an oscillating circuit whose operation is independent of the width of the applicator.
  • L ⁇ o ⁇ ⁇ R2 1 in which R is the radius of the winding, l the length of the coil and ⁇ o the permeability of the vacuum.
  • C ⁇ o ⁇ l ⁇ d e in which ⁇ o is the permissibility of the vacuum, l and d respectively the width and the length of a plate and e the spacing between the two plates.
  • the inductor and the capacitor are connected in a distributed manner over the entire length l of the inductor, according to the width of the same dimension l of the capacitor.
  • the resonant frequency of the applicator is, in this type of applicator, independent of the width l of the plates.
  • the inductor is constituted by a metal strip extending transversely over its entire width the plate of the capacitor acting as a hot electrode; moreover, the internal face of the plate of the capacitor serving as a ground electrode is divided into elementary sections by a set of longitudinal grooves, in the direction of movement of the material.
  • the longitudinal grooves define sections elements which are elementary applicators of small dimensions, having the same resonant frequency and having no interactions between them.
  • This structure provides the desired self-regulation.
  • the elementary sections have a width which is at most 5 cm.
  • it is around or less than a centimeter.
  • the internal faces of the plate of the capacitor, acting as a hot electrode, and of the inductor are divided into elementary sections by a set of longitudinal grooves arranged opposite the grooves formed in the plate of the capacitor acting as an electrode of mass. This grooving of the other elements makes it possible to reinforce the independence of the elementary applicators.
  • the inductor consists of a metal strip in the shape of an arc of a circle, extending transversely the plate of the capacitor acting as a hot electrode.
  • the metal strip curved in the shape of an arc of a circle can be compared to a contiguous coil.
  • the applicator comprises two flat capacitors, the plates of which acting as hot electrodes are in the same plane and connected by the ends of the metal strip in an arc, constituting the inductor.
  • the inductor consists of a metal band in an arc
  • the metal strip makes it possible to vary the internal section of the choke.
  • It is for example a metal plate which is in contact with the external face of the metal strip and which is equipped with a sliding system, capable of exerting a stress on the strip such that the arc of a circle uniformly deforms over the entire length of the choke.
  • the resonant frequency of the applicator can also be adjusted by means of adjusting the spacing of the plates of the capacitor.
  • Another means of adjusting the electromagnetic field on the material may consist of bars mounted transversely on the faces of the plates of the capacitor facing the material; such bars are capable of varying the intensity of the electromagnetic field and of concentrating it on the product to be treated. They are particularly useful when the material to be treated is thin.
  • the transverse bars are themselves divided into elementary sections by longitudinal grooves, arranged opposite the grooves formed in the plate of the capacitor acting as a ground electrode.
  • the elementary sections can be separated from each other by strips of insulating material.
  • the applicator is supplied by a generator connected by a coaxial flange on the one hand to a first metal strip of progressive section extending the plate of the capacitor acting as a ground electrode and on the other hand to a second metal strip of progressive section whose end forming a coupling strip is placed parallel and opposite another coupling strip extending in elevation the plate of the capacitor acting as hot electrode, the two coupling strips acting as coupling capacity.
  • This particular arrangement makes it possible to obtain a distributed coupling of great homogeneity in the transverse direction.
  • the applicator comprises two capacitors, the plates of which acting as hot electrodes are connected by a choke; it is possible to put several applicators of this type in series, and also to increase the number of inductors succeeding each other with capacities in the direction of travel of the material.
  • This solution has the advantage of increasing the processing time and distributing in the direction of travel the total available energy, especially if one is limited by the maximum applied voltage.
  • Figure 1 is a schematic perspective view of the applicator according to the invention traversed by a planar material
  • Figure 2 is a diagram showing the corresponding electrical diagram.
  • FIG. 3 is a schematic sectional view of the applicator according to the plane AA ′ of FIG. 1.
  • the high-frequency or microwave resonant applicator 1 consists of an upper plate 2 and a lower plate 3 which are parallel and facing each other, between which a flat material 4 moves.
  • This material is for example a fabric, a knitted fabric, a nonwoven, a paper, a plastic film ...
  • the material 4 is supported by two rollers 5,6 respectively, positioned so that the material is flat between these two rollers 5,6 and without contact with the two trays 2,3 and parallel to them.
  • the upper plate 2 is a rectangular metal plate whose width l, that is to say the dimension measured in the transverse direction of movement of the material according to arrow D, is at least equal and preferably greater than the width of the material 4.
  • the internal face of the upper plate 2, facing the flat material 4, has longitudinal grooves, illustrated in FIG. 1 by dotted lines 7.
  • These grooves 7 are such that they delimit the elementary sections 19 of small dimension, of the order of a centimeter in width, independent of each other.
  • the spacing between two sections 19, corresponding to the width of a groove 7, is small, of the order of one to a few millimeters. It is understood that the maintenance in position of the various elementary sections 19 may result from an assembly using an insulating material.
  • the lower plate 3 of the same overall dimension as the upper plate 2 is composed of two rectangular portions 8, 9 connected between two by a metal strip 10 curved in an arc of a circle towards the outside of the plate 3.
  • the internal face of the two portions 8, 9 of the lower plate 3 has longitudinal grooves, illustrated in FIG. 1 by dotted lines 7 ', and arranged opposite the grooves 7 made in the upper plate 2.
  • the grooves 7' delimit elementary sections 20.
  • Crossbars 18 are fixed, by screwing, on the internal faces, facing the flat material 4, of the upper plate 2 and of the lower portions 8, 9 either in opposite, or in staggered rows as shown in Figure 1.
  • transverse bars 18 are also grooved, in the same way as the plates 2,3, so as to delimit elementary sections 22, which are separated from each other by blades 23 of an insulating material.
  • the front transverse edge of the upper plate 2 is extended by a first metal strip 11 whose width gradually decreases to a dimension allowing connection to a coaxial flange 12 connected to a high frequency generator or microwave not shown. It is the mass of the coaxial flange 12 which is connected to the first metal strip 11.
  • the central electrode 13 of the coaxial flange 12 is in contact with an upper coupling strip 14 by through a second metal strip 15.
  • the upper coupling strip 14 is a rectangular metal plate placed in front of the upper plate 2, of short length and width equivalent to that of the upper plate 2. It is flush with the flat material 4, parallel to this.
  • the second metal strip 15 connects the central electrode 13 to the upper coupling strip 14. Its width gradually decreases from the upper coupling strip 14 which it extends to the central electrode 13.
  • the lower front portion 8 is extended by a lower coupling strip 16 which is a metal plate raised relative to the internal face of said portion 8.
  • This lower coupling strip 16 faces the upper coupling strip 14, being separated of the latter by a spacing sufficient to allow the passage of the plane material 4.
  • the two lower portions 8, 9 are the hot electrodes of two capacitors, the ground electrodes of which are constituted by the upper plate 2; the metal strip in an arc 10 constitutes the inductor of the oscillating circuit.
  • the internal face of the metallic band arc of a circle 10 has longitudinal grooves 7 ⁇ , arranged opposite the grooves 7 made in the upper plate 2.
  • the hot electrodes are supplied with energy by coupling between the upper coupling strip 14 supplied by the generator and the lower coupling strip 16, the two upper and lower strips 14, 15 forming a coupling capacity.
  • the applicator 1 has two systems for adjusting the resonant frequency.
  • the first is a system for deformation of the metal strip in an arc 10 forming the self; it comprises a metal plate 17 bearing on an external generator of the circular arc, and sliding means, for example sets of threaded rods and nuts making it possible to vertically move said plate 17 by a determined and adjustable height .
  • Such displacement results in correlatively a deformation of the arc of a circle and consequently a variation of the cross section of the inductor. It is understood that this variation of the surface of said section of the inductor varies the resonant frequency.
  • the second system for adjusting the resonant frequency of the applicator is a system for adjusting the spacing of the upper plate 2 relative to the two fixed lower portions 8, 9. This is for example a set of jacks fixed to a frame and whose rods are integral with the upper plate 2, having several possible adjustment positions.
  • the applicator is connected to the generator G by the coupling capacity C3 corresponding to the two upper and lower bands 14,16 of coupling.
  • the resistors R1 and R2 represent the transformation of the material during the treatment, for example the heating of the material corresponds to the power dissipated in each of the resistors R1 and R2.
  • the power dissipated in the resistor r, in series of the inductor L, represents the power dissipated in the applicator and the losses thereof.
  • the value of the self L it is obtained by measuring the resonant frequency.
  • the value of the resistance of the inductor it is obtained by determining the value of the overvoltage factor of the oscillating circuit in the absence of planar material 4.
  • the equivalent electrical diagram makes it possible to carry out the power balance and thus calculate the power transferred to the product, the power consumed in the applicator and the total reflected power by the applicator.
  • the planar material 4 to be treated behaves during treatment, and in particular how its dielectric constant will change as a function of temperature. Indeed the adjustment of the resonance frequency will be determined taking into account this information so as to obtain the desired self-regulating effect.
  • the resonant frequency will be chosen to be slightly higher
  • the resonant frequency will be chosen either slightly higher than the generator frequency or lower than this.
  • All of the elementary sections 19, 20, 21, delimited by the vertical planes 24, 25 passing through two successive grooves, respectively in the upper plate 2, in the lower plate 3, in the transverse bars 18 and in the metal strip in circular arc 10 forms a basic, independent applicator.
  • the resonant frequency of the oscillating circuit has been chosen lower than the generator frequency, the same fluctuation tends to reduce the difference between the two frequencies and leads to supplying the capacitor with a higher electric voltage; that is to say to increase the power supplied to the material in this elementary applicator.
  • Each elementary applicator having an independent functioning the regulation effect is local and does not modify the treatment of the material located in the neighboring elementary applicators.
  • the applicator may include several inductors, for example the lower plate will then be composed of three lower portions as described above, separated and linked together by two metal strips in an arc forming a circle acting as inductors.
  • This version allows the processing time to be increased and the total available energy to be distributed in the direction of travel of the planar material; it is interesting when one is limited by the maximum applied voltage.
  • the arc shape of the inductor is not limiting; it can for example have a substantially square shape.
  • the variation of the internal section of the choke will be obtained by displacement of its base, mobile, along its fixed lateral sides.
  • the applicator according to the invention will be installed inside a box electrically connected to the ground of the generator and acting as electromagnetic shielding.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Electrotherapy Devices (AREA)
EP91402846A 1990-10-25 1991-10-24 Hochfrequenzresonanz oder Mikrowellenapplikator zur thermischen Behandlung von kontinuierlich bewegendem Bandmaterial Expired - Lifetime EP0484210B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9013629A FR2668673B1 (fr) 1990-10-25 1990-10-25 Applicateur resonnant haute-frequence ou micro-onde pour traitement thermique de materiau plan en defilement continu.
FR9013629 1990-10-25

Publications (2)

Publication Number Publication Date
EP0484210A1 true EP0484210A1 (de) 1992-05-06
EP0484210B1 EP0484210B1 (de) 1994-08-10

Family

ID=9401813

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Application Number Title Priority Date Filing Date
EP91402846A Expired - Lifetime EP0484210B1 (de) 1990-10-25 1991-10-24 Hochfrequenzresonanz oder Mikrowellenapplikator zur thermischen Behandlung von kontinuierlich bewegendem Bandmaterial

Country Status (5)

Country Link
US (1) US5175406A (de)
EP (1) EP0484210B1 (de)
JP (1) JP3213998B2 (de)
DE (1) DE69103374T2 (de)
FR (1) FR2668673B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5423260A (en) * 1993-09-22 1995-06-13 Rockwell International Corporation Device for heating a printed web for a printing press
JP3077879B2 (ja) * 1994-02-15 2000-08-21 インターナショナル・ビジネス・マシーンズ・コーポレ−ション ウェブ・タイプの定量された処理材料にマイクロ波エネルギーを印加するための装置及び方法
US5794428A (en) * 1996-05-29 1998-08-18 Rhodes; Cheryl Elizabeth Method of bulking and heat-setting a moving, continuous length of twisted thermoplastic yarn
RU2175171C2 (ru) * 1999-02-19 2001-10-20 Новосибирский государственный технический университет Устройство для плазмохимической обработки электронных приборов
RU2175153C2 (ru) * 1999-08-13 2001-10-20 Новосибирский государственный технический университет Устройство для плазмохимической обработки электронных приборов
RU2262150C2 (ru) * 2003-11-06 2005-10-10 Новосибирский государственный технический университет Устройство для плазмохимической обработки электронных приборов
DE102009007546A1 (de) * 2008-09-08 2010-03-11 Kiefel Gmbh Vorrichtung zum Verschweißen eines Verbindungsbereichs einer Folie mit einem Anschlussteil sowie Verwendung, Verfahren , Anlage und Beutel
KR102197333B1 (ko) 2020-08-04 2021-01-04 효성첨단소재 주식회사 폴리아크릴로니트릴계 내염화 섬유, 탄소섬유 및 그의 제조방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1151084A (fr) * 1956-05-30 1958-01-23 Acec Système d'électrodes pour chauffage par pertes diélectriques
GB858384A (en) * 1958-05-30 1961-01-11 Radio Heaters Ltd Improvements in or relating to dielectric heating equipment
US3461263A (en) * 1967-07-31 1969-08-12 Radio Frequency Co Inc Radio frequency heating apparatus
US3532848A (en) * 1968-04-26 1970-10-06 Varian Associates Resonant r.f. energy applicator for treating wide regions of material
EP0128397A2 (de) * 1983-06-03 1984-12-19 Siemens Aktiengesellschaft Kapazitiver Hochfrequenz-Durchlaufofen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512311A (en) * 1948-09-01 1950-06-20 Gen Electric High-frequency heating apparatus
US2783347A (en) * 1954-03-26 1957-02-26 Nat Cylinder Gas Co High-frequency heating systems and applicators
BE565971A (de) * 1957-03-23
GB1136616A (en) * 1965-12-01 1968-12-11 Aeg Elotherm Gmbh A method of and apparatus for inductively heating electrically conducting workpieces
US4112285A (en) * 1977-03-14 1978-09-05 The Continental Group, Inc. Induction heating using parallel electric/magnetic fields

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1151084A (fr) * 1956-05-30 1958-01-23 Acec Système d'électrodes pour chauffage par pertes diélectriques
GB858384A (en) * 1958-05-30 1961-01-11 Radio Heaters Ltd Improvements in or relating to dielectric heating equipment
US3461263A (en) * 1967-07-31 1969-08-12 Radio Frequency Co Inc Radio frequency heating apparatus
US3532848A (en) * 1968-04-26 1970-10-06 Varian Associates Resonant r.f. energy applicator for treating wide regions of material
EP0128397A2 (de) * 1983-06-03 1984-12-19 Siemens Aktiengesellschaft Kapazitiver Hochfrequenz-Durchlaufofen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEE PROC. vol. 128, no. 9, Décembre 1981, STEVENAGE, GB pages 583 - 588; PAT HULLS & RALPH SHUTE: 'Dielelctric Heating in Industry, Application of Radio Frequency and Microwaves' *

Also Published As

Publication number Publication date
US5175406A (en) 1992-12-29
JPH0737685A (ja) 1995-02-07
FR2668673B1 (fr) 1996-08-23
DE69103374T2 (de) 1995-03-09
FR2668673A1 (fr) 1992-04-30
EP0484210B1 (de) 1994-08-10
JP3213998B2 (ja) 2001-10-02
DE69103374D1 (de) 1994-09-15

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