EP0486472B1 - Installation de chauffage d'un produit long en matériau électriquement conducteur - Google Patents

Installation de chauffage d'un produit long en matériau électriquement conducteur Download PDF

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Publication number
EP0486472B1
EP0486472B1 EP92101680A EP92101680A EP0486472B1 EP 0486472 B1 EP0486472 B1 EP 0486472B1 EP 92101680 A EP92101680 A EP 92101680A EP 92101680 A EP92101680 A EP 92101680A EP 0486472 B1 EP0486472 B1 EP 0486472B1
Authority
EP
European Patent Office
Prior art keywords
strand
capacitor plates
capacitor
high frequency
opposite
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.)
Expired - Lifetime
Application number
EP92101680A
Other languages
German (de)
English (en)
Other versions
EP0486472A3 (fr
EP0486472A2 (fr
Inventor
Eckhard Schulz
Georg Zimmermann
Franz Wosnitza
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 EP0486472A2 publication Critical patent/EP0486472A2/fr
Publication of EP0486472A3 publication Critical patent/EP0486472A3/fr
Application granted granted Critical
Publication of EP0486472B1 publication Critical patent/EP0486472B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • 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
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0088—Lubricating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/34—Heating or cooling presses or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/04—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band
    • B30B5/06—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of an endless band co-operating with another endless band
    • 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 invention relates to a device for heating a strand guided in a channel from an electrically conductive material, a capacitor plate arrangement which is connected to a high-frequency generator being arranged in an electrically insulated manner from the strand, and the capacitor plate arrangement being two pairs of opposing first ones which are adjacent in the longitudinal direction of the strand Has capacitor plates, on the two outer sides of which two further pairs of second capacitor plates are arranged in the longitudinal direction of the strand, which are connected to a connection of the high-frequency generator which is at zero potential.
  • Such a device is known from EP-A-0 085 318, in which two capacitor plates are arranged on two opposite sides of the channel offset by approximately their length from one another, which are connected to a non-potential-free connection of the high-frequency generator, while adjacent on both sides to the two capacitor plates are each arranged two further capacitor plates, which are connected to the potential-free connection of the high-frequency generator and extend along the channel to such an extent that the strand is no longer at potential outside the heating range.
  • the heating of the strand is not sufficiently uniform and, as a result, it can lead to the formation of shells within the strand, which affects the homogeneity of the end product and thus its strength, if, for example, building materials to be hardened are heated.
  • a high-frequency heating of workpieces is known from AT-B-184 997, the workpieces being conveyed by a device which comprises an impedance arrangement in the form of carriages, slides or other moving devices.
  • Each device is equipped with a capacitor plate which is moved for operation parallel to one or more stationary capacitor plates of the device for energy coupling which are subjected to voltage with one or more high-frequency generators against ground.
  • the high-frequency energy is transferred capacitively from the fixed to the moving capacitor plate and thus to the respective device, which has a capacitive impedance, i.e. comprises a capacitor which represents the impedance generating heat in the workpiece.
  • an inductive impedance is then shunted in the respective device to form a tunable resonant circuit.
  • the workpiece to be heated is at rest relative to the capacitor plates of the device.
  • the device is unsuitable for heating a strand of conductive material.
  • the object of the invention is therefore to provide a device of the type mentioned at the outset which enables more uniform heating of the strand and prevents the formation of shells within the strand.
  • the object is achieved in that a further high-frequency generator which is not correlated with the first high-frequency generator is provided and a pair of opposing first capacitor plates is connected to the outputs of one of the two high-frequency generators.
  • the distance between the floating outer capacitor plates is and to select the adjacent, middle, non-potential-free capacitor plates at least equal to the distance of the capacitor plates opposite each other with respect to the strand, while the distance between the middle neighboring capacitor plates can be narrower.
  • the skin effect in heating devices using high-frequency electrical energy is normally a second-order disturbance, it can become a dominant effect depending on the size of the capacitor plate.
  • the capacitor plates each from several, preferably two, partial plates which are at the same potential and whose adjacent edges are separated by a slot which is preferably kept as small as possible.
  • Fig. 1 shows essentially schematically and in perspective a strip strand system with a device for heating the strand.
  • the 1 comprises four belts 10, 11, 12 and 13, which are arranged such that they form a rectangular channel 14 between them.
  • the belts 10 to 13 are guided around rollers 15 and driven synchronously by means of a drive, not shown.
  • the tapes 10 to 13 are, if necessary, also supported adjacent to the channel 14 by support gratings, not shown, while the vertical tapes 12 and 13 can additionally be guided at their edges via slide rails.
  • the lower horizontal belt 10 is extended beyond the outlet end of the channel 14 and guided to the belt running control via a dancer roller 16.
  • a filling device e.g. a filling funnel 17, which is expediently arranged such that it can be moved out of the inlet region of the channel 14 by means of a piston-cylinder unit for cleaning.
  • the outlet opening of the filling funnel 17 is located in the inlet area of the channel 14.
  • a cutting device 18 is provided, which can be moved in the feed direction of the strip 10 from an initial position synchronously with the feed speed of the strip 10 and can be returned to the initial position after the cutting process has been carried out.
  • the cutting device 18 has a bracket 19, which receives a cutting wire 19a to and fro and is adjustable in the vertical direction in accordance with the cutting progress and can be moved with a slide 20.
  • a belt weighing line can follow the cutting device 18 be provided.
  • the tapes 10 to 13 consist of an electrically non-conductive plastic, while adjacent to the tapes 12 and 13, namely on the outside of the tape parts, which form the entrance area of the channel 14, a schematically illustrated capacitor plate arrangement 21 is provided, which via corresponding lines 22 High-frequency generators 23 are connected.
  • a raw mixture for example consisting of quartz sand, lime, water, cement with an accelerator / retarder system and foam for the production of lime silicate stones
  • the raw mixture passes into the channel 14 and is conveyed through the belts 10 to 13 on the predetermined channel cross section kept.
  • the raw mixture in the duct 14 is heated, for example, to a temperature of 50 ° C. via the capacitor plate arrangement 21, so that the raw mixture solidifies due to the strengthening reactions of the cement that are set in motion.
  • the solidifying strand of raw mixture in channel 14 is conveyed through belts 10 to 13 to the outlet end of channel 14. A relative movement between the strand and the belts 10 to 13 and between the belts 10 to 13 does not take place here, so that the wear problems are minimal.
  • the tapes 10 to 13 are sprayed with a separating agent by spray devices 24 before they are deflected to the channel 14.
  • wipers 25 are provided, which remove any adhering material from the belts 10 to 13.
  • the solidified strand After the solidified strand exits the channel 14, it is transported further through the lower belt 10 and divided into individual stone blanks 26 by means of the cutting device 18.
  • the isolated stone blanks 26 can then optionally be weighed on a belt weighing line in order to be able to readjust the composition of the raw mixture in this way in order to ensure the most uniform possible To achieve cullet bulk density of the stone blanks 26.
  • the waste heat from the high-frequency generators 23 can be used by blowing warm air generated by the generator cooling, for example by means of a hood, onto the stone blanks 26 in order to harden them, so that these have a sufficiently high strength for subsequent transport to an autoclave, but they do not must be fully generated by the heating in the region of the capacitor plate assembly 21.
  • the length of the channel 14 is dimensioned such that the emerging strand has a desired strength, which may be increased to the necessary value by reheating with warm air from the generator cooling or another heat source.
  • the area of the channel 14 is expediently accommodated in a housing (not shown) which is at ground potential and which extends from the filling funnel 17 to the cutting device 18.
  • the belts 10 to 13 with their rollers 15 as well as support grids and sliding guides can be adjusted with respect to their belt levels so that the cross section of the channel 14 can be changed.
  • the length of the blanks 26 can be changed by the cycle of the cutting device 18.
  • the feed speed of the belts 10 to 13 is expediently adjustable, in particular continuously variable, in order to be able to adapt the feed speed to the heating speed and the size of the capacitor plate arrangement 21 accordingly.
  • the belt strand system is suitable, for example, for the production of blanks for wall blocks, in particular lightweight blocks, for example based on lime silicate, gas or foam concrete or made of coarse-ceramic material, the raw mixture containing large amounts of foam and water, so that body density down to 0.2 g / cm3 can be achieved.
  • two pairs of opposing capacitor plates 30 are provided adjacent to the belts 12 and 13 at a distance from one another, between which two further pairs of opposing capacitor plates 31 are arranged, so that in the longitudinal direction of the channel 14 a capacitor plate 30, two capacitor plates 31 and a capacitor plate 30 follow one another in the longitudinal direction of the channel 14 on the two opposite sides.
  • Two high-frequency generators 23 of half the total power are provided, which are uncorrelated.
  • the outer pairs of capacitor plates 30 are each connected to the potential-free connection (0) of one of the two high-frequency generators 23 and extend along the channel 14 to such an extent that the stray fields emanating from the inner capacitor plates 31 are picked up by the capacitor plates 30 on both sides, so that the strand inside the channel 14 is free of contact voltage outside the heating area.
  • the capacitor plates 31 are shorter than the capacitor plates 30 and each connected to the other non-potential-free connection (+) of one of the two high-frequency generators 23, which applies a zero potential to the capacitor plates 30 which are adjacent to the capacitor plates 31 in the longitudinal direction of the channel 14.
  • auxiliary capacitor plates 32 which are each connected to the non-potential-free connection (+) of the two high-frequency generators 23, are provided adjacent to the bands 10 and 11 opposite one another approximately in the middle between the four middle capacitor plates 31.
  • the auxiliary capacitor plates 32 can be approximately as long as the capacitor plates 31, but are narrow in relation to the distance d between the capacitor plates 30 and 31 and are directed with their longitudinal axis in the direction of the longitudinal axis of the channel 14.
  • the auxiliary capacitor plates 32 together with the same-polarized capacitor plates 31 lead between the outer, differently polarized capacitor plates 30 to a field line distribution which, in addition to the entire heating of the strand, particularly supports surface heating, which contributes to a shortening of the heating path, the auxiliary capacitor plates 32 providing additional heating in the area of cause neighboring strand. In the above-mentioned applications, this leads to an additional hardening in this area and thus also to a better detachment of the hardened strand from the belts 10, 11.
  • two high-frequency generators 23 of half the total power are provided, which are uncorrelated are.
  • a pair of mutually opposite middle capacitor plates 31 is connected to the potential-free and to the potential-free connection of one of the two high-frequency generators 23 (potential-free supply to the capacitor plates), the adjacent capacitor plates 31 being of opposite polarity, but in each case in the longitudinal direction of the strand other high frequency generator 23 are connected.
  • a distance between the capacitor plates 30, 31 in the longitudinal direction of the strand is at least approximately equal to the distance d between capacitor plates 30 or 31 located opposite one another.
  • the polarity of the capacitor plates 30, 31 is the same as in FIG. 3, but only one high-frequency generator 23 is used.
  • Auxiliary capacitor plates 32 can be provided in the middle between the four middle capacitor plates 31 as in FIG. 2, but in such a way that they are also approximately at a distance d from the adjacent capacitor plates 31.
  • the auxiliary capacitor plates 32 can also be round or oval.
  • the distance between adjacent capacitor plates 30, 31 lying at zero potential can be chosen to be smaller than d, as shown in FIG. 5.
  • the auxiliary capacitor plates 32 of the embodiment of FIG. 4 can also be connected to a further uncorrelated high-frequency generator 23, in which case the distance between the capacitor plates 31 and 32 can be chosen to be correspondingly small.
  • the capacitor plate arrangement is as in FIG. 5, but the opposite pairs of capacitor plates 31 are each subjected to voltage symmetrically to the zero potential by connecting a capacitor plate 31 to an output terminal of the respective high-frequency generator 23 and the opposite capacitor plate 31 to the latter is connected via a phase shifting lambda / 2 bypass line 34 or a phase shifter network which causes a phase shift by half a period.
  • a high-frequency generator 23 with a symmetrical output can also be used.
  • the opposing pairs of capacitor plates 31 are subjected to voltage symmetrically to the zero potential by connecting a capacitor plate 31 to one output connection of the high-frequency generator 23 and the capacitor plate 31 opposite with respect to the string to the other output connection of the high-frequency generator 23, which causes the opposite electrodes to be driven in phase .
  • the capacitor plates 30 are then connected to the zero potential of the high-frequency generator 23.
  • the capacitor plate 31 connected to the ungrounded connection of the high-frequency generator overlaps a small piece across the bands 10, 11 at both ends transversely to the longitudinal direction of the strand, either through a bend 35 or through its own narrow auxiliary capacitor plate 36 realized, whereby the field in the upper and lower region of the strand is slightly compressed for local surface heating. If this is followed by a further pair of capacitor plates 31 of reversed polarity, the more inhomogeneous field is located on the other side of the strand, so that overall a good homogeneous surface heating results.
  • the capacitor plates 31 can consist of a plurality of sub-plates 31a, 31b arranged adjacent to one another in order to keep the skin effect in the strand material as low as possible.
  • the partial plates 31a, 31b are at the same potential and their adjacent edges are separated by a slot 37, which can be as narrow as possible due to the same potential.
  • the concavity of the capacitor plate 30, 31 can be filled with a material 38 with the highest possible dielectric constant, so that its surface facing the corresponding band 10, 11, 12 or 13 is flat and abuts against it.
  • plastics have a dielectric constant of the order of about 2 to 4 (with a loss factor tg ⁇ , which is extremely low, so that the plastic practically does not heat up)
  • materials such as calcium titanate are provided here, whose dielectric constant is very much greater than 1 is. Also show these materials have high dimensional stability and a low coefficient of thermal expansion.
  • the extrudate has a dielectric constant of approximately 40 to 80 and a noteworthy loss factor tg ⁇ , ie the extrudate can be heated particularly well by means of a high-frequency field.
  • the capacitor plates on the sides facing the strips with a plastic layer or to embed the capacitor plates in plastic in order to keep the wear of the strips moving along the capacitor plates low.
  • this plastic coating should be as thin as possible so as not to influence the stress profile too much.
  • the material 41 can be ground and polished on the side facing the belt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Structural Engineering (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Resistance Heating (AREA)
  • General Induction Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (10)

  1. Dispositif pour le réchauffage d'un boudin constitué d'un matériau électriquement conducteur se déplaçant à l'intérieur d'un canal (14), comprenant un générateur haute fréquence (23) relié à un agencement (21) de plaques de condensateur électriquement isolé par rapport audit boudin, ledit agencement (21) de plaques de condensateur présentant deux paires de premières plaques de condensateur (31) se faisant face, placées côté à côte dans le sens longitudinal du boudin, sur les deux côtés extérieurs desquelles, longitudinalement au boudin, sont disposées deux autres paires de secondes plaques de condensateur (30) lesquelles sont reliées à une borne de potentiel zéro du générateur haute fréquence (23), caractérisé en ce que l'on prévoit un générateur haute fréquence (23) supplémentaire non corrélé avec le premier générateur haute fréquence (23) et en ce que chaque paire de premières plaques de condensateur (31) se faisant face est respectivement reliée aux sorties de l'un des deux générateurs haute fréquence (23).
  2. Dispositif selon la revendication 1, caractérisé en ce que deux plaques prises suivant une diagonale des premières plaques de condensateur (31) se faisant face sont connectées aux bornes de potentiel zéro des générateurs haute fréquence (23).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'il est prévu, longitudinalement, entre les plaques de condensateur (30, 31) placées côte à côte, une distance au moins sensiblement égale à la distance (d) entre les plaques de condensateur (30 ou 31) se faisant face par rapport au boudin.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que les premières plaques de condensateur (31) qui sont disposées sur les côtés opposés par rapport au boudin, sont chargées de manière symétrique par rapport au potentiel zéro.
  5. Dispositif selon la revendication 4, caractérisé par le fait qu'une première plaque de condensateur (31) est reliée à la première plaque de condensateur (31) qui lui fait face par rapport au boudin, par un circuit de dérivation lambda/2 (34) ou par un circuit de déphasage.
  6. Dispositif selon la revendication 4, caractérisé par le fait que le générateur haute fréquence (23) présente des bornes de sortie symétriques par rapport au potentiel zéro.
  7. Dispositif selon l'une des revendications 1 à 6, caractérisé par le fait que les premières et éventuellement les secondes plaques de condensateur (31, 30) sont constituées respectivement d'au moins deux plaques partielles (31a, 31b) séparées par une fente (37).
  8. Dispositif selon l'une des revendications 1 à 7, caractérisé par le fait que les premières et éventuellement les secondes plaques de condensateur (31, 30) présentent une concavité en direction du boudin, cette concavité étant remplie par un matériau électriquement isolant (38).
  9. Dispositif selon la revendication 8, caractérisé par le fait que le matériau électriquement isolant (38) présente une constante diélectrique nettement supérieure à 1, de préférence supérieure à 100.
  10. Dispositif selon l'une des revendications 1 à 9, caractérisé par le fait que dans le cas d'un boudin présentant des arêtes longitudinales, les premières plaques de condensateur (31) entourent le boudin au moyen d'un bord rabattu (35) ou d'une plaque auxiliaire distincte (36) sur une petite proportion par rapport à sa largeur, sur les deux arêtes voisines disposées sur ses côtés se faisant face mutuellement et sur lesquels ne viennent pas s'appliquer les premières plaques de condensateur (31).
EP92101680A 1985-12-10 1986-12-09 Installation de chauffage d'un produit long en matériau électriquement conducteur Expired - Lifetime EP0486472B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19853543569 DE3543569A1 (de) 1985-12-10 1985-12-10 Vorrichtung zum erwaermen eines strangs aus elektrisch leitfaehigem material
DE3543569 1985-12-10
EP86117107A EP0228615B1 (fr) 1985-12-10 1986-12-09 Dispositif pour réchauffer une billette en matériau conducteur électrique

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP86117107.2 Division 1986-12-09
EP86117107A Division EP0228615B1 (fr) 1985-12-10 1986-12-09 Dispositif pour réchauffer une billette en matériau conducteur électrique

Publications (3)

Publication Number Publication Date
EP0486472A2 EP0486472A2 (fr) 1992-05-20
EP0486472A3 EP0486472A3 (fr) 1992-05-27
EP0486472B1 true EP0486472B1 (fr) 1994-09-21

Family

ID=6288080

Family Applications (4)

Application Number Title Priority Date Filing Date
EP92101679A Expired - Lifetime EP0487504B1 (fr) 1985-12-10 1986-12-09 Dispositif pour le chauffage d'un produit long en matériau conducteur électrique
EP92101680A Expired - Lifetime EP0486472B1 (fr) 1985-12-10 1986-12-09 Installation de chauffage d'un produit long en matériau électriquement conducteur
EP86117107A Expired - Lifetime EP0228615B1 (fr) 1985-12-10 1986-12-09 Dispositif pour réchauffer une billette en matériau conducteur électrique
EP92101681A Expired - Lifetime EP0485363B1 (fr) 1985-12-10 1986-12-09 Installation de chauffage d'un produit long en matériau électriquement conducteur

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP92101679A Expired - Lifetime EP0487504B1 (fr) 1985-12-10 1986-12-09 Dispositif pour le chauffage d'un produit long en matériau conducteur électrique

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP86117107A Expired - Lifetime EP0228615B1 (fr) 1985-12-10 1986-12-09 Dispositif pour réchauffer une billette en matériau conducteur électrique
EP92101681A Expired - Lifetime EP0485363B1 (fr) 1985-12-10 1986-12-09 Installation de chauffage d'un produit long en matériau électriquement conducteur

Country Status (3)

Country Link
EP (4) EP0487504B1 (fr)
AT (4) ATE112129T1 (fr)
DE (5) DE3543569A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3817831A1 (de) * 1988-05-26 1989-11-30 Sicowa Verfahrenstech Verfahren zur herstellung von bloecken
DE69018899D1 (de) * 1989-08-21 1995-06-01 Gen Electric Material mit einer hohen dielektrischen Konstante, das elektrischer Felder zum Erhitzen von Kunststoffen erzeugt.
DE102021121013A1 (de) 2021-08-12 2023-02-16 KB Engineering GmbH Verfahren zur Herstellung von ein- oder mehrschichtigen Formelementen, insbesondere von Wand- oder Steinelementen, sowie zugehörige Anlage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2288269A (en) * 1941-06-04 1942-06-30 Compo Shoe Machinery Corp Electrostatic heating apparatus
DE858868C (de) * 1951-02-18 1952-12-11 Siemens Ag Verfahren zum Behandeln eines z. B. stueckfoermigen Gutes durch die Einwirkung einesWechselfeldes
GB726359A (en) * 1952-05-23 1955-03-16 Bostadsforskning Ab Improvements in or relating to high frequency heating systems
DE933046C (de) * 1953-04-19 1955-09-15 Siemens Ag Vorrichtung zum Behandeln von insbesondere koernigem Schuettgut durch ein Hochfrequenzfeld
AT184997B (de) * 1954-08-09 1956-03-10 Bostadsforskning Ab Einrichtung zur Hochfrequenzerhitzung von Werkstücken, die in Wagen, Schiebern od. dgl. durch eine Erhitzungsanlage befördert werden
EP0085318B1 (fr) * 1982-01-30 1987-09-09 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Dispositif pour le chauffage d'une coulée en matériau conducteur électrique ainsi que son application

Also Published As

Publication number Publication date
EP0228615A2 (fr) 1987-07-15
ATE81434T1 (de) 1992-10-15
DE3543569A1 (de) 1987-06-11
EP0486472A3 (fr) 1992-05-27
DE3686938D1 (de) 1992-11-12
EP0487504A1 (fr) 1992-05-27
EP0485363B1 (fr) 1994-11-17
EP0485363A2 (fr) 1992-05-13
ATE113434T1 (de) 1994-11-15
EP0487504B1 (fr) 1994-10-26
DE3650076D1 (de) 1994-10-27
EP0486472A2 (fr) 1992-05-20
EP0228615B1 (fr) 1992-10-07
ATE112129T1 (de) 1994-10-15
DE3650141D1 (de) 1994-12-22
ATE114212T1 (de) 1994-12-15
EP0228615A3 (en) 1988-06-08
EP0485363A3 (en) 1992-05-27
DE3650115D1 (de) 1994-12-01

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