EP0085319A1 - Einrichtung zur kapazitiven Erwärmung sowie deren Verwendung - Google Patents

Einrichtung zur kapazitiven Erwärmung sowie deren Verwendung Download PDF

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Publication number
EP0085319A1
EP0085319A1 EP83100274A EP83100274A EP0085319A1 EP 0085319 A1 EP0085319 A1 EP 0085319A1 EP 83100274 A EP83100274 A EP 83100274A EP 83100274 A EP83100274 A EP 83100274A EP 0085319 A1 EP0085319 A1 EP 0085319A1
Authority
EP
European Patent Office
Prior art keywords
walls
capacitor plates
heated
capacitor
dielectric constant
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.)
Withdrawn
Application number
EP83100274A
Other languages
German (de)
English (en)
French (fr)
Inventor
Eckhard Schulz
Paul Prof. Dr. Farwig
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.)
Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
Original Assignee
Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
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 Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG filed Critical Sicowa Verfahrenstechnik fuer Baustoffe GmbH and Co KG
Publication of EP0085319A1 publication Critical patent/EP0085319A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/42—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for heating or cooling, e.g. steam jackets, by means of treating agents acting directly on the moulding material
    • 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

Definitions

  • the invention relates to a device for capacitive heating of a material according to the preamble of claim 1 and its use.
  • Devices of this type are used, for example, to dry plate-like materials, such as wood fiber boards, or to harden their binders.
  • the capacitor plates are brought into contact with the material to be heated and the latter is heated to the desired temperature in the electrical field generated between the capacitor plates by a high-frequency generator.
  • the resonant circuit of which should work as resonantly as possible is complex and problematic. This is especially true for materials that are conductive, liquid, and have a relatively high dielectric constant.
  • a pourable raw mixture which consists of a heat-activated binder, such as cement with appropriate accelerators, foam, water, sand and, if necessary, other additives, for example for the production of lightweight building blocks based on lime silicate or also of gas or foam concrete or of coarse ceramic material, to be manufactured.
  • a raw mixture is sought which contains a correspondingly large amount of foam together with a large amount of water in order to achieve the lowest possible cullet bulk density, the water content being able to reach 50% by weight or more in order to achieve cullet bulk densities down to 0.2 g / cm 3 to achieve.
  • Limiting the mixture by means of the capacitor plates, which then form part of the shaping device, would lead to an uncontrolled and thus uneven supply of heat and furthermore to severe losses.
  • the object of the invention is therefore to provide a device according to the preamble of claim 1, in which the losses can be kept to a minimum and the energy supply to the material to be heated takes place evenly, even if the material to be heated is relatively due to a high water content has a high dielectric constant, so that there is an essentially homogeneous and also rapid heating of the material even over a larger volume.
  • the exemplary embodiment relating to the production of blanks for building materials from a pourable raw mixture which, in addition to a heat-activatable, preferably hydraulic binder, contains high amounts of water and foam, sand and other aggregates, whereby the raw mixture is heated is used to initiate strength-forming reactions of the binder, for example cement with accelerator, for a sufficient but short time so that the blanks have the strength sufficient for demolding and subsequent transport.
  • a heat-activatable, preferably hydraulic binder contains high amounts of water and foam, sand and other aggregates, whereby the raw mixture is heated is used to initiate strength-forming reactions of the binder, for example cement with accelerator, for a sufficient but short time so that the blanks have the strength sufficient for demolding and subsequent transport.
  • a farm 1o for example made of plastic material, which can be closable.
  • the mold 10 is located on a machine frame 11, which can, among other things, carry devices for filling the mold 10, for demolding the blanks formed and for transferring them to a transport device (these devices not being shown).
  • capacitor plates 12 Adjacent to the opposite side walls 10a of the mold 10, capacitor plates 12 are arranged parallel to it and extending over the entire surface of the side walls 10a. In particular, the capacitor plates 12 extend in both dimensions so far beyond the adjacent side walls 10a that the most uniform possible power density is achieved.
  • the two capacitor plates 12 are connected to a high-frequency generator 13.
  • the capacitor plates 12 are supported, for example, via insulators 14 by means of supports 15 on the machine frame 11 and are held adjacent to the side walls 10a.
  • the capacitor plates 12 are arranged at a short distance from the side walls 1oa with the formation of an air gap 16 between a respective capacitor plate 12 and an adjacent side wall 1oa, the capacitance of the capacitor plates 12, the air gaps 16 and the side walls 1oa being adjusted accordingly by adjusting the air gap 16 and the farm content 17 - the raw mixture from which the blank is produced - the multilayer capacitor formed can be optimally matched to the generator power, so that the resonant circuit of the high-frequency generator 13 oscillates at the resonance frequency. If necessary, a parallel capacitance 21 to the multilayer capacitor can be provided for optimal adaptation of the high frequency, which can be realized by an additional capacitor plate at a distance from one of the capacitor plates 12.
  • the capacitance of the multilayer capacitor also changes.
  • the setting of the width of the air gap 16 by means of the stepping motor 20 via a control circuit can be carried out automatically with adaptation to the generator power.
  • a farm 10 is shown in the exemplary embodiment, which e.g. could consist of a mold box that can be lifted off a base plate, optionally with a lid, but instead a shaping device can also be provided, which consists of a channel in which a strand of raw mixture is transported and heated in the area between the capacitor plates and thus solidified. After exiting the channel, the strand can then be cut into the individual blanks. This has the advantage that the heating can be carried out more slowly over a longer distance without impairing the cycle time.
  • the multilayer capacitor according to the invention can also be used for purposes other than the manufacture of blanks for building materials, where a corresponding liquid or moist material is to be heated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP83100274A 1982-01-30 1983-01-14 Einrichtung zur kapazitiven Erwärmung sowie deren Verwendung Withdrawn EP0085319A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823203132 DE3203132C1 (de) 1982-01-30 1982-01-30 Einrichtung zur kapazitiven Erwaermung
DE3203132 1982-01-30

Publications (1)

Publication Number Publication Date
EP0085319A1 true EP0085319A1 (de) 1983-08-10

Family

ID=6154379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100274A Withdrawn EP0085319A1 (de) 1982-01-30 1983-01-14 Einrichtung zur kapazitiven Erwärmung sowie deren Verwendung

Country Status (5)

Country Link
EP (1) EP0085319A1 (da)
JP (1) JPS58135594A (da)
CA (1) CA1194137A (da)
DE (1) DE3203132C1 (da)
DK (1) DK21783A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054833A1 (en) 2001-01-08 2002-07-11 Lars Ekemar tN APPLIANCE FOR THE EQUALISATION OF HEAT IN A DIELECTRIC LOAD HEATED BY AN OSCILLATING ELECTRIC/ELECTROMAGNETIC FIELD
ES2273579A1 (es) * 2005-06-21 2007-05-01 Carlos Fradera Pellicer Procedimiento para el tratamiento de elementos tecnicos que endurecen en el tiempo.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2639532B2 (ja) * 1987-08-28 1997-08-13 東芝セラミックス株式会社 キャスタブル耐火物の硬化方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB645254A (en) * 1945-11-10 1950-10-25 Igranic Electric Co Ltd Improvements in or relating to dielectric heating oscillator circuits
FR1382539A (fr) * 1963-02-13 1964-12-18 Procédé de couplage de circuits électriques de haute fréquence
GB985442A (en) * 1960-08-31 1965-03-10 Radyne Ltd Improvements in or relating to dielectric heating apparatus
DE1207255B (de) * 1960-02-06 1965-12-16 Coignet Construct Edmond Verfahren zur Beschleunigung der Aushaertung von Schwer- oder Gussbeton
DE1290272B (de) * 1960-08-09 1969-03-06 Ciba Geigy Form fuer die Waermebehandlung von Formkoerpern im elektrischen Hochfrequenzfeld und Verfahren zur Herstellung solcher Formen
DE2727701A1 (de) * 1977-06-21 1979-01-04 Borgers Johann Gmbh Co Kg Verfahren zur herstellung von komplettierten daemmelementen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB645254A (en) * 1945-11-10 1950-10-25 Igranic Electric Co Ltd Improvements in or relating to dielectric heating oscillator circuits
DE1207255B (de) * 1960-02-06 1965-12-16 Coignet Construct Edmond Verfahren zur Beschleunigung der Aushaertung von Schwer- oder Gussbeton
DE1290272B (de) * 1960-08-09 1969-03-06 Ciba Geigy Form fuer die Waermebehandlung von Formkoerpern im elektrischen Hochfrequenzfeld und Verfahren zur Herstellung solcher Formen
GB985442A (en) * 1960-08-31 1965-03-10 Radyne Ltd Improvements in or relating to dielectric heating apparatus
FR1382539A (fr) * 1963-02-13 1964-12-18 Procédé de couplage de circuits électriques de haute fréquence
DE2727701A1 (de) * 1977-06-21 1979-01-04 Borgers Johann Gmbh Co Kg Verfahren zur herstellung von komplettierten daemmelementen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002054833A1 (en) 2001-01-08 2002-07-11 Lars Ekemar tN APPLIANCE FOR THE EQUALISATION OF HEAT IN A DIELECTRIC LOAD HEATED BY AN OSCILLATING ELECTRIC/ELECTROMAGNETIC FIELD
US7105789B2 (en) 2001-01-08 2006-09-12 Ekemar Lars S E Appliance for the equalization of heat in a dielectric load heated by an oscillating electric/electromagnetic field
ES2273579A1 (es) * 2005-06-21 2007-05-01 Carlos Fradera Pellicer Procedimiento para el tratamiento de elementos tecnicos que endurecen en el tiempo.

Also Published As

Publication number Publication date
DK21783D0 (da) 1983-01-20
DK21783A (da) 1983-07-31
JPS58135594A (ja) 1983-08-12
DE3203132C1 (de) 1983-08-04
CA1194137A (en) 1985-09-24

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Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19831220

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19851116

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FARWIG, PAUL, PROF. DR.

Inventor name: SCHULZ, ECKHARD