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US3652816A - Self cleaning dielectric heater - Google Patents

Self cleaning dielectric heater Download PDF

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Publication number
US3652816A
US3652816A US27615A US3652816DA US3652816A US 3652816 A US3652816 A US 3652816A US 27615 A US27615 A US 27615A US 3652816D A US3652816D A US 3652816DA US 3652816 A US3652816 A US 3652816A
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United States
Prior art keywords
web
barrier
chamber
electrodes
heated
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Expired - Lifetime
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US27615A
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Mark Preston
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MCBEE TECHNOGRAPHICS Inc A CORP OF MASSACHUSETTS
TECHNOGRAPHICS FITCHBURG PATER Inc A MA CORP
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Litton Business Systems Inc
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Assigned to TECHNOGRAPHICS FITCHBURG PATER, INC., A MA CORP reassignment TECHNOGRAPHICS FITCHBURG PATER, INC., A MA CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LITTON BUSINESS SYSTEMS, INC.
Assigned to MCBEE TECHNOGRAPHICS, INC., A CORP OF MASSACHUSETTS reassignment MCBEE TECHNOGRAPHICS, INC., A CORP OF MASSACHUSETTS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LITTON BUSINESS SYSTEMS INC.
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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
    • 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

  • ABSTRACT High frequency heating apparatus including means for generating a high frequency electromagnetic field, means for exposing a material to be heated to said electromagnetic field, a barrier web or sheet between said electrode means and said material so as to collect matter expelled by the material as it is being heated, means for continuously moving the barrier so as to continuously remove the expelled matter from the apparatus, the barrier having a low dielectric loss factor so as to not consume field energy.
  • the present invention relates to heating of the dielectric material by the passage of the material through a high frequency electromagnetic field.
  • the present invention relates to dielectric heating apparatus wherein materials are heated by exposure to a high frequency electromagnetic field.
  • the invention provides for the insertion of a barrier sheet or web between the electrodes and material to be heated so as to collect matter expelled from the material being heated.
  • the barrier sheet or web is selected from a material having a dielectric loss factor of less than 0.05 so as not to consume energy and interfere with the heating operation.
  • the barrier is preferably in web form so as to be capable of being continuously moved through the apparatus and disposed of before expelled matter builds up. Partitions are provided to overlap the edges of the barrier web so as to completely seal off the electrodes from the material being heated.
  • the barrier material makes two passes through the apparatus to assure complete pickup of expelled matter.
  • FIG. 1 is a side elevation showing the apparatus constructed in accordance with the present invention.
  • FIG. 2 is a cross section taken on line 2-2 of FIG. 1.
  • FIG. 3 is a cross section taken on line 3-3 ofFIG. 2.
  • I FIG. 4 is a modification showing the use of a endless belt barrier.
  • a dielectric heater 1 is shown with a web or cord of material 2 to be heated being passed over roller 3, through top wall entrance slot 4, through heating chamber 5, out through bottom wall exit slot 6 and over roller 7 to a wind or further processing station.
  • a series of electrodes 8 and 9 are mounted alternately in chamber 5 and are connected by suitable conductors l and 11 respectively to a radio frequency generator 12 and to ground.
  • Radio frequency generator 12 is a conventional radio frequency oscillator capable of operating in a frequency range of 50 kHz. to 3,000 MHz. and is connected to suitable power source 13 by conductors 12A and 128.
  • a barrier web 14 which is wound on a roller 15, is unrolled and passed up and through slot 6, through the heating chamber between the electrodes and the material 2 being heated, then Accordingly, the apparatus is i out through slot 4 and then around rollers 16 and 17 and again back through the heating chamber 5, around roller 18 to a drive wind-up roller 19. Any conventional drive means may be utilized for driving roller 19. Any contaminant expelled by the material being dried is caught and carried off by the barrier web 14.
  • the barrier web 14 passes through the heating chamber 5 twice thereby affording protection against contaminants accidentally passing through the outer pass of the web.
  • the barrier may be chosen from any number of materials provided the material has a dielectric loss factor of less than 0.05 so as not to readily heat and consume power in the electromagnetic field. It should also be capable of withstanding the heat generated in heater 1. The latter requirement will vary depending upon the particular application.
  • materials which have been found suitable are fiberglass cloth, silicone rubber, flame retardant paper, and cloths made from polyester and polyamide synthetic fibers such as those sold under the trademark Dacron and Nylon.
  • Partitions 20 and 21 include flanges 22 and 23 which are bolted to sidewalls 24 and 25 of chamber 5. Partitions 20 and 21 extend in from sidewalls 24 and 25 and terminate adjacent the edges of the barrier web 14.
  • panels 26 and 27 Extending from and bolted to partition 20 are panels 26 and 27 which overlap the edges of the barrier web 14 as to completely seal off the electrode chamber from the expelled matter. Similar panels 28 and 29 extend from partition 21 and overlap the opposite edge of web 14.
  • the panels 26, 27, 28 and 29, which extend in the path of radiation between the electrodes and the material being heated are also preferably formed from a material having a low dielectric loss power. Since these panels must be rigid, they may be constructed of rigid laminates of the low dielectric loss material described above. A typical construction would comprise several layers of silicon impregnated fiberglass cloth laminated under heat and pressure. I
  • the spacing of panels 26 and 27 and panels 27 and 28 is such that the edges of web 14 ride in contact with the surfaces of the panels so as to make certain the electrodes are sealed off.
  • the barrier material comprises an endless belt 14.
  • a brush 31 is provided so as to clean the barrier material as it passes out of the heater 1.
  • a special barrier material is required so as to make easy the release of the coated contaminant.
  • a barrier web may comprise, for example, silicone rubber.
  • any material having the low dielectric loss factor and coated with a conventional release coating may be used.
  • a dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, said barrier means including means extending from the side walls of said chamber and overlapping opposite edges of said web.
  • a dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, means for moviiig said web in a double pass across the face of said electrodes.
  • a dieiectric heater as defined by claim 2 means for scraping contaminants from said web, said web comprising an endless belt.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

High frequency heating apparatus including means for generating a high frequency electromagnetic field, means for exposing a material to be heated to said electromagnetic field, a barrier web or sheet between said electrode means and said material so as to collect matter expelled by the material as it is being heated, means for continuously moving the barrier so as to continuously remove the expelled matter from the apparatus, the barrier having a low dielectric loss factor so as to not consume field energy.

Description

United States Patent Preston [451 Mar. 28, 1972 [54] SELF CLEANING DIELECTRIC HEATER [72] inventor: Mark Preston, New Ipswich, N.H.
[73] Assignee: Litton Business Systems, Inc., New York,
[22] Filed: Apr. 13, 1970 [2 1] Appl. No.: 27,615
[52] U.S.Cl ..219/l0.6l
[51] Int. Cl. ..H05b 5/00, H05b 9/06 [58] Field ofSeai-ch ..2l9/l0.61
[56] References Cited UNITED STATES PATENTS A 2,381,278 8/1945 Gregory et al. ...219/10.6l X
Brown et a1 ...2l9/l0.61 X
2,473,251 6/1949 Hsu .L ..219/l0.6l
Primary Examiner-J. V. Truhe Assistant Examiner-Hugh D. Jaeger Attorney-Norman Friedman, Stephen E. Feldman, Morris I. Pollack, Arthur T. Groeninger and Philip Furgang [57] ABSTRACT High frequency heating apparatus including means for generating a high frequency electromagnetic field, means for exposing a material to be heated to said electromagnetic field, a barrier web or sheet between said electrode means and said material so as to collect matter expelled by the material as it is being heated, means for continuously moving the barrier so as to continuously remove the expelled matter from the apparatus, the barrier having a low dielectric loss factor so as to not consume field energy.
4 Claims, 4 Drawing Figures GENERATOR DO WE/? SOURCE SHEET 1 BF 2 FIG. 1
PATENTEDMARZB me I P'ATENTfnmzs m2 3.652.816 sum 2 OF 2 FIG.3
INVENTOR MARK PRESTON V ATTORNEY SELF CLEANING DIELECTRIC HEATER BACKGROUND OF THE INVENTION The present invention relates to heating of the dielectric material by the passage of the material through a high frequency electromagnetic field.
In drying certain materials by this method, dye stuffs, waxes, oils and the like are often expelled from the material during the heating process. This is due to vapor escaping from the material being heated and entraining impregnants and coatings therewith. These impregnants and coatings are detrimental to the operation of the apparatus because they often present fire hazards, corrode critical components and insulate the conductors from cooling air.
A particular problem in this regard is encountered in the drying of latex coated fiberglass used in the tire industry. During such drying, the latex coating is expelled, resulting in the electrodes and other critical components being coated with latex. Such latex coatings cannot be removed even by the use of solvents or hard scrubbing. permanently damaged. g
I-Ieretofore, no one has made heating apparatus of the dielectric type which has been commercially suitable for the drying of fiberglass or other materials where this problem exists.
BRIEF DESCRIPTION OF THE INVENTION The present invention relates to dielectric heating apparatus wherein materials are heated by exposure to a high frequency electromagnetic field. The invention provides for the insertion of a barrier sheet or web between the electrodes and material to be heated so as to collect matter expelled from the material being heated. The barrier sheet or web is selected from a material having a dielectric loss factor of less than 0.05 so as not to consume energy and interfere with the heating operation. The barrier is preferably in web form so as to be capable of being continuously moved through the apparatus and disposed of before expelled matter builds up. Partitions are provided to overlap the edges of the barrier web so as to completely seal off the electrodes from the material being heated. The barrier material makes two passes through the apparatus to assure complete pickup of expelled matter.
DRAWINGS FIG. 1 is a side elevation showing the apparatus constructed in accordance with the present invention.
FIG. 2 is a cross section taken on line 2-2 of FIG. 1.
FIG. 3 is a cross section taken on line 3-3 ofFIG. 2. I FIG. 4 is a modification showing the use of a endless belt barrier.
DETAILED DESCRIPTION Referring to FIG. 1, a dielectric heater 1 is shown with a web or cord of material 2 to be heated being passed over roller 3, through top wall entrance slot 4, through heating chamber 5, out through bottom wall exit slot 6 and over roller 7 to a wind or further processing station.
In order to generate an RF field, a series of electrodes 8 and 9 are mounted alternately in chamber 5 and are connected by suitable conductors l and 11 respectively to a radio frequency generator 12 and to ground. a
Radio frequency generator 12 is a conventional radio frequency oscillator capable of operating in a frequency range of 50 kHz. to 3,000 MHz. and is connected to suitable power source 13 by conductors 12A and 128.
As the material 2 is being heated, moisture therein is vaporized and this vapor carries along other contaminants which are coated or impregnated therein. In order to prevent the contaminants from fouling the electrodes 8 and 9, a barrier web 14, which is wound on a roller 15, is unrolled and passed up and through slot 6, through the heating chamber between the electrodes and the material 2 being heated, then Accordingly, the apparatus is i out through slot 4 and then around rollers 16 and 17 and again back through the heating chamber 5, around roller 18 to a drive wind-up roller 19. Any conventional drive means may be utilized for driving roller 19. Any contaminant expelled by the material being dried is caught and carried off by the barrier web 14. The barrier web 14 passes through the heating chamber 5 twice thereby affording protection against contaminants accidentally passing through the outer pass of the web.
The barrier may be chosen from any number of materials provided the material has a dielectric loss factor of less than 0.05 so as not to readily heat and consume power in the electromagnetic field. It should also be capable of withstanding the heat generated in heater 1. The latter requirement will vary depending upon the particular application.
Generally, materials which have been found suitable are fiberglass cloth, silicone rubber, flame retardant paper, and cloths made from polyester and polyamide synthetic fibers such as those sold under the trademark Dacron and Nylon.
Referring to FIGS. 2 and 3, it will be noted that the electrodes 8 and 9 are completely sealed off from the material being heated. Partitions 20 and 21 include flanges 22 and 23 which are bolted to sidewalls 24 and 25 of chamber 5. Partitions 20 and 21 extend in from sidewalls 24 and 25 and terminate adjacent the edges of the barrier web 14.
Extending from and bolted to partition 20 are panels 26 and 27 which overlap the edges of the barrier web 14 as to completely seal off the electrode chamber from the expelled matter. Similar panels 28 and 29 extend from partition 21 and overlap the opposite edge of web 14. The panels 26, 27, 28 and 29, which extend in the path of radiation between the electrodes and the material being heated are also preferably formed from a material having a low dielectric loss power. Since these panels must be rigid, they may be constructed of rigid laminates of the low dielectric loss material described above. A typical construction would comprise several layers of silicon impregnated fiberglass cloth laminated under heat and pressure. I
The spacing of panels 26 and 27 and panels 27 and 28 is such that the edges of web 14 ride in contact with the surfaces of the panels so as to make certain the electrodes are sealed off.
Referring to FIG. 4, a modification of the present invention is shown wherein the barrier material comprises an endless belt 14. A brush 31 is provided so as to clean the barrier material as it passes out of the heater 1.
In the modification of FIG. 4, a special barrier material is required so as to make easy the release of the coated contaminant. Such a barrier web may comprise, for example, silicone rubber. Generally, any material having the low dielectric loss factor and coated with a conventional release coating may be used.
Although a preferred embodiment of the invention has been disclosed, it is to be understood that changes and variations may be made within the scope of the invention.
What is claimed: 1
l. A dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, said barrier means including means extending from the side walls of said chamber and overlapping opposite edges of said web.
2. A dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, means for moviiig said web in a double pass across the face of said electrodes. v
3. A dielectric heater as defined by claim 1, means for scraping contaminants from said web, said web comprising an endless belt.
4. A dieiectric heater as defined by claim 2, means for scraping contaminants from said web, said web comprising an endless belt.

Claims (4)

1. A dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, said barrier means including means extending from the side walls of said chamber and overlapping opposite edges of said web.
2. A dielectric heater including a chamber, electrodes in a portion of said chamber, a barrier for sealing off said electrode portion of said chamber, said barrier including a web, means for moving said web across the face of said electrodes, said web comprised of a material having a dielectric loss factor of less than 0.05, means for moving said web in a double pass across the face of said electrodes.
3. A dielectric heater as defined by claim 1, means for scraping contaminants from said web, said web comprising an endless belt.
4. A dielectric heater as defined by claim 2, means for scraping contaminants from said web, said web comprising an endless belt.
US27615A 1970-04-13 1970-04-13 Self cleaning dielectric heater Expired - Lifetime US3652816A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906562A (en) * 1972-02-03 1975-09-23 Commw Scient Ind Res Org Heat treating apparatus and process
US6169278B1 (en) * 1999-03-19 2001-01-02 Rockwell Collins, Inc. Dielectric heating using spread-spectrum energy
US20150052775A1 (en) * 2013-08-23 2015-02-26 Whirlpool Corporation Appliance for drying articles
US10006163B2 (en) 2015-03-23 2018-06-26 Whirlpool Corporation Apparatus for drying articles
US10024899B2 (en) 2013-10-16 2018-07-17 Whirlpool Corporation Method and apparatus for detecting an energized e-field
US10184718B2 (en) 2013-07-17 2019-01-22 Whirlpool Corporation Method for drying articles
US10246813B2 (en) 2013-12-09 2019-04-02 Whirlpool Corporation Method for drying articles
US10323881B2 (en) 2013-10-02 2019-06-18 Whirlpool Corporation Method and apparatus for drying articles
US10533798B2 (en) 2013-08-14 2020-01-14 Whirlpool Corporation Appliance for drying articles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381278A (en) * 1942-11-05 1945-08-07 Westinghouse Electric Corp Inductive heating coil shielding
US2460566A (en) * 1943-11-19 1949-02-01 Rca Corp Treatment of synthetic fibers and apparatus therefor
US2473251A (en) * 1945-05-29 1949-06-14 Gen Electric High-frequency dielectric heating apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381278A (en) * 1942-11-05 1945-08-07 Westinghouse Electric Corp Inductive heating coil shielding
US2460566A (en) * 1943-11-19 1949-02-01 Rca Corp Treatment of synthetic fibers and apparatus therefor
US2473251A (en) * 1945-05-29 1949-06-14 Gen Electric High-frequency dielectric heating apparatus

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906562A (en) * 1972-02-03 1975-09-23 Commw Scient Ind Res Org Heat treating apparatus and process
US6169278B1 (en) * 1999-03-19 2001-01-02 Rockwell Collins, Inc. Dielectric heating using spread-spectrum energy
US10816265B2 (en) 2013-07-17 2020-10-27 Whirlpool Corporation Method for drying articles
US11655583B2 (en) 2013-07-17 2023-05-23 Whirlpool Corporation Method for drying articles
US10184718B2 (en) 2013-07-17 2019-01-22 Whirlpool Corporation Method for drying articles
US10533798B2 (en) 2013-08-14 2020-01-14 Whirlpool Corporation Appliance for drying articles
US10823502B2 (en) * 2013-08-14 2020-11-03 Whirlpool Corporation Appliance for drying articles
US9784499B2 (en) * 2013-08-23 2017-10-10 Whirlpool Corporation Appliance for drying articles
US10837702B2 (en) 2013-08-23 2020-11-17 Whirlpool Corporation Appliance for drying articles
US11459696B2 (en) 2013-08-23 2022-10-04 Whirlpool Corporation Appliance for drying articles
US20150052775A1 (en) * 2013-08-23 2015-02-26 Whirlpool Corporation Appliance for drying articles
US11686037B2 (en) 2013-10-02 2023-06-27 Whirlpool Corporation Method and apparatus for drying articles
US10323881B2 (en) 2013-10-02 2019-06-18 Whirlpool Corporation Method and apparatus for drying articles
US11029088B2 (en) 2013-10-02 2021-06-08 Whirlpool Corporation Method and apparatus for drying articles
US10024899B2 (en) 2013-10-16 2018-07-17 Whirlpool Corporation Method and apparatus for detecting an energized e-field
US10816586B2 (en) 2013-10-16 2020-10-27 Whirlpool Corporation Method and apparatus for detecting an energized e-field
US11519130B2 (en) 2013-10-16 2022-12-06 Whirlpool Corporation Method and apparatus for detecting an energized e-field
US10246813B2 (en) 2013-12-09 2019-04-02 Whirlpool Corporation Method for drying articles
US11078619B2 (en) 2015-03-23 2021-08-03 Whirlpool Corporation Apparatus for drying articles
US10655270B2 (en) 2015-03-23 2020-05-19 Whirlpool Corporation Apparatus for drying articles
US10006163B2 (en) 2015-03-23 2018-06-26 Whirlpool Corporation Apparatus for drying articles
US11692298B2 (en) 2015-03-23 2023-07-04 Whirlpool Corporation Method of drying articles

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Owner name: TECHNOGRAPHICS FITCHBURG PATER, INC., 601 RIVER ST

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LITTON BUSINESS SYSTEMS, INC.;REEL/FRAME:004301/0225

Effective date: 19840427

Owner name: MCBEE TECHNOGRAPHICS, INC., 601 RIVER STREET FITCH

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LITTON BUSINESS SYSTEMS INC.;REEL/FRAME:004299/0359

Effective date: 19840427