US3681558A - Capacitive high-frequency heating apparatus - Google Patents

Capacitive high-frequency heating apparatus Download PDF

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Publication number
US3681558A
US3681558A US149261A US3681558DA US3681558A US 3681558 A US3681558 A US 3681558A US 149261 A US149261 A US 149261A US 3681558D A US3681558D A US 3681558DA US 3681558 A US3681558 A US 3681558A
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United States
Prior art keywords
electrodes
rods
supply means
electrode
opposite
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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
US149261A
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English (en)
Inventor
Hans Christian Grassman
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Siemens AG
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Siemens AG
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Publication date
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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
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/16—Drying webs by electrical heating
    • D21F5/165—Inductive heating; Capacitive heating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/09—Various apparatus for drying textiles

Definitions

  • CAPACITIVE HIGH-FREQUENCY HEATING APPARATUS My invention relates to an apparatus for uniform capacitive heating of wide bands of dielectric material, especially paper, wherein the bands are movable past a stray field of electrode groupings.
  • These electrode groupings each comprise a plurality of rod-like individual electrodes, disposed next to each other in row and equally spaced. The electrodes are alternately fed with high-frequency voltage of alternating or different polarities.
  • Dielectric heating apparatus can be equipped with stray field electrodes wherein the electrode rods form a row of capacitors with air dielectric. If a material that is to be heated is brought to the vicinity of the electrodes for example, to a distance of approximately to percent of the distance betweenneigh-boring rods, then the field between the rods is so deflected that it goes through the material. The intensity of the field deflection is dependent upon the dielectric loss factor (cthu tan 8) of the material.
  • Stray field electrodes are used with success in continuous production methods especially for handling thin layers of material, for example, to dry leather, paper, carpets, etc.
  • an object of my invention to provide an apparatus of the above-mentioned type having electrodes of a length of up to one-fifth of the wavelength of the applied frequency wherein a voltage distribution is provided which is uniform to within several percent.
  • I provide an apparatus of the above-mentioned type having two electrode groups lying in respective mutually opposite parallel planes.
  • a feed system is provided whose individual rods are disposed in a third plane between the two parallel planes.
  • the individual rods are connected alternately with different poles of the high frequency source.
  • Each of the electrodes of one of the groups lies 7 opposite a corresponding one of the electrodes of the other group.
  • Each of the rods is between a corresponding pair of the opposite electrodes and connected with the latter via contact slides movable in the rod direction.
  • each individual rod is connected with its both ends to the same pole of the high-frequency source and, with electrode arrangement of M5, two contact sliders are arranged M15 from each end respectively. In this way, a voltage constant to within plus or minus 1.5 percent is obtained. Without the central feed a voltage change in the direction along the electrodes of up to 20 percent would occur.
  • the electrodes can be subdivided into sets or groups in the longitudinal direction for obtaining a more uniform distribution of the field. Also for obtaining a more even field distribution, the generators can be compensated by means of suitable chokes and/or capacitors as well as by other known techniques applied.
  • FIG. 1 is a plan view of a capacitive high-frequency heating apparatus according to the invention.
  • FIG. 2 is a view of the apparatus of FIG. 1 taken along the line II-II;
  • FIG. 3 illustrates the voltage distribution on a rodlike electrode
  • FIG. 4 illustrates how the electrodes can be arranged in groups or sets which are supplied separately to obtain a more uniform field distribution.
  • a band of paper 1 to be dried having a width of 4 meters is guided in the direction of arrow 2 first through the stray field e of the stray field electrode grouping 11.
  • the paper band 1 is directed over a directional roller 3, and then, through the stray field of the stray field electrode grouping 13.
  • the stray field electrode grouping 11 and 13 are comprised of respective pluralities of rod like electrodes 5 and 7.
  • the electrodes of each grouping are arranged in a plane and spaced at equal distances from each other.
  • the electrodes 5 and 7 are alternately supplied with a high frequency voltage of different polarities.
  • a voltage supply serves a feed system 12.
  • the feed system or group 12 is arranged between the two stray field electrode groups 11 and 13 such that the three groups 11 to 13 lie in three mutually parallel planes.
  • Each of the individual rods 6 of the supply system 12 is connected with corresponding ones of the electrodes 5 and 7 via contact sliders 9.
  • the individual rods are connected at both ends at terminals 8 alternately with respective poles of the high-frequency source.
  • the contact slider 9 is movable in the direction of the double arrow 10 and can, in combination with the individual treating frequency of f 13.56 MHz the length l of the electrodes 5 and 7 and of the individual rods 6 is approximately 4 meters and the width of the band 1 is likewise 4 meters.
  • Both contact sliders 9 are approximately 13 meters (M15) distant from the ends of the individual rods 6. The spacing between the two contact sliders 9 amounts to approximately 1.4 meters.
  • FIG. 3 illustrates the voltage distribution on an electrode Ssupplied via contact slider 9.
  • the broken line curve b shows the voltage U which results from the supply over a central feed system and curve a designates the voltage U, which would occur if the middle supply system were not available.
  • the individual electrode groups seen in the running direction of the running path, have a length corresponding to only approximately half the path width in order to guarantee a path transport without difficulties.
  • the required drying time can be obtained 'by means of several electrode systems connected one behind the other.
  • FIG. 4 illustrates how the electrodes may be subdivided into sets and supplied separately from the highfrequency source. This arrangement functions to make the field of the electrodes uniform.
  • Apparatus for uniform capacitive heating of bands of dielectric material such as paper and the like comprising two electrode groups arranged in respective mutually parallel planes, each of said electrode groups including a plurality of rod-like electrodes spaced in a row equally, each of the electrodes of one of said groups lying opposite a corresponding one of the electrodes of the other group, a feed system arranged in a third plane intermediate said two electrode groups, said feed system including a plurality of individual rods, each of said rods being disposed between a corresponding pair of said opposite electrodes, high-frequency supply means for supplying said feed system, said rods being alternately connected with different poles of said supply means, and contact means slidably mounted between each of said rods and said corresponding pair of opposite electrodes.
  • each of said rods being connected at both its ends-to a like pole of said high-frequency supply means, said electrodes having a length of one-fifth of the wavelength (A) of the operating frequency of said supply means, said control means comprising a plurality of sliding contacts, each two of said co tacts bei arran ed 'th r s ct to a correspon ing one o s aid roo for electri c lly connecting the latter and said corresponding pair of said opposite electrodes, said two contacts being positioned a distance of M15 from said ends of said corresponding one of said rods respectively.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Drying Of Solid Materials (AREA)
US149261A 1970-06-05 1971-06-02 Capacitive high-frequency heating apparatus Expired - Lifetime US3681558A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2027674A DE2027674C3 (de) 1970-06-05 1970-06-05 Einrichtung zur gleichmäßigen kapazitiven Erwärmung Von breiten Bahnen

Publications (1)

Publication Number Publication Date
US3681558A true US3681558A (en) 1972-08-01

Family

ID=5773125

Family Applications (1)

Application Number Title Priority Date Filing Date
US149261A Expired - Lifetime US3681558A (en) 1970-06-05 1971-06-02 Capacitive high-frequency heating apparatus

Country Status (10)

Country Link
US (1) US3681558A (nl)
JP (1) JPS5035255B1 (nl)
AT (1) AT302500B (nl)
CH (1) CH525596A (nl)
DE (1) DE2027674C3 (nl)
FI (1) FI55922C (nl)
FR (1) FR2095902A5 (nl)
GB (1) GB1303768A (nl)
NL (1) NL170798C (nl)
SE (1) SE358957B (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859494A (en) * 1973-04-18 1975-01-07 Walter Spengler Device for drying wet coatings applied to substrates of low electrical conductivity
US4242805A (en) * 1978-07-07 1981-01-06 Service D'exploitation Industrielle Des Tabacs Et Des Allumettes Method and apparatus for drying a thick wet layer coated on one face of a cardboard sheet
US5074055A (en) * 1989-04-11 1991-12-24 Imatran Voima Oy Apparatus for heating a dielectric web or sheet material or for decreasing its moisture content

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2816551C3 (de) * 1978-04-17 1981-11-26 SIEMENS AG AAAAA, 1000 Berlin und 8000 München Trocknungsregelung an einer Papiermaschine
DE2841371C2 (de) * 1978-09-22 1987-10-22 Siemens AG, 1000 Berlin und 8000 München Einrichtung zur Führung einer Papierbahn im kapazitiven Hochfrequenztrockner
DE2932373C2 (de) * 1979-08-09 1985-08-08 Siemens AG, 1000 Berlin und 8000 München Einrichtung zur kapazitiven Streufeldtrocknung von Papierbahnen oder dergleichen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119920A (en) * 1962-05-29 1964-01-28 Nat Distillers Chem Corp Moving heater strip temperature control
US3469054A (en) * 1967-03-15 1969-09-23 Bangor Punta Operations Inc Shielded dielectric heating apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119920A (en) * 1962-05-29 1964-01-28 Nat Distillers Chem Corp Moving heater strip temperature control
US3469054A (en) * 1967-03-15 1969-09-23 Bangor Punta Operations Inc Shielded dielectric heating apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859494A (en) * 1973-04-18 1975-01-07 Walter Spengler Device for drying wet coatings applied to substrates of low electrical conductivity
US4242805A (en) * 1978-07-07 1981-01-06 Service D'exploitation Industrielle Des Tabacs Et Des Allumettes Method and apparatus for drying a thick wet layer coated on one face of a cardboard sheet
US5074055A (en) * 1989-04-11 1991-12-24 Imatran Voima Oy Apparatus for heating a dielectric web or sheet material or for decreasing its moisture content

Also Published As

Publication number Publication date
FI55922C (fi) 1979-10-10
JPS5035255B1 (nl) 1975-11-14
NL170798C (nl) 1982-12-16
GB1303768A (nl) 1973-01-17
DE2027674A1 (de) 1971-12-09
SU390740A3 (nl) 1973-07-11
FR2095902A5 (nl) 1972-02-11
FI55922B (fi) 1979-06-29
CH525596A (de) 1972-07-15
NL7106299A (nl) 1971-12-07
SE358957B (nl) 1973-08-13
AT302500B (de) 1972-10-10
DE2027674B2 (de) 1973-10-11
NL170798B (nl) 1982-07-16
DE2027674C3 (de) 1974-05-09

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