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WO2004030882A1 - Procede et appareil de conditionnement thermique de produits ceramiques humides - Google Patents

Procede et appareil de conditionnement thermique de produits ceramiques humides Download PDF

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Publication number
WO2004030882A1
WO2004030882A1 PCT/GR2003/000042 GR0300042W WO2004030882A1 WO 2004030882 A1 WO2004030882 A1 WO 2004030882A1 GR 0300042 W GR0300042 W GR 0300042W WO 2004030882 A1 WO2004030882 A1 WO 2004030882A1
Authority
WO
WIPO (PCT)
Prior art keywords
articles
electromagnetic radiation
materials
wet
thermal conditioning
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.)
Ceased
Application number
PCT/GR2003/000042
Other languages
English (en)
Inventor
George Vekinis
Ioannis Gyllis
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU2003264909A priority Critical patent/AU2003264909A1/en
Priority to EP03798970A priority patent/EP1615758A1/fr
Publication of WO2004030882A1 publication Critical patent/WO2004030882A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • 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
    • B28B11/241—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening using microwave heating means
    • 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
    • B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
    • 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
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • 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
    • H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
    • H05B2206/04—Heating using microwaves
    • H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair

Definitions

  • the present invention relates to a method and apparatus for thermal conditioning of ceramic materials and products to assist and accelerate their drying during the production process.
  • Manufacturing of clay-based traditional (earthenware) ceramics is generally a three stage process.
  • the first stage consists of forming (dry or wet) wet tiles, bricks, crockery, fixtures and others by manual or automatic pressing or extrusion.
  • the articles After forming, at the second stage, the articles are dried in temperature-controlled air and in humidity- controlled environments and then, at the third and final stage, they are fired in large kilns or furnaces at temperatures from about 850°C to 1300°C, thereby consolidating the clay by joining some of the components into a hard (usually glassy) and relatively strong mass. Glazing and decorations are usually applied prior to the firing process.
  • a number of physical mechanisms can damage the ceramic material or article during drying: - Sudden "thermal shock” experienced by the material or article as it enters the drier can result in cracking, spalling etc.
  • a further aspect of the present invention is to provide an improved apparatus for thermal conditioning of wet ceramic products, more particularly for carrying out the method of the present invention.
  • a method for thermal conditioning of wet ceramic materials or articles wherein the wet ceramic materials or articles receive electromagnetic radiation of such intensity and in such manner so as to raise the temperature of the water inside of the ceramic material or article up to or close to the boiling point of water without increasing the surface temperature of said ceramic material or article and without any drying of the materials or articles.
  • an apparatus for thermal conditioning of wet ceramic materials or articles which comprises at least one preferred tubular modular unit, wherein said at least one modular unit comprises means of electromagnetic radiation, so that the ceramic materials or articles moving through said apparatus receive electromagnetic radiation of sufficient intensity and in such a way as to provide sufficient thermal energy to heat up the water inside the materials or articles to or close to the boiling point of water, without heating the surface of the materials or articles and without drying them.
  • Fig. 1 shows a cross-sectional view of a preferred arrangement of a conditioner for a continuous feeding ceramic plant, e.g. a modern brick factory according to the present invention
  • Fig. 2 shows a cross-sectional view of a preferred module according to the present invention.
  • a "thermal conditioning" stage is provided between the forming and drying stages.
  • thermal conditioning it is meant “thermal preparation of the formed wet article in such a way as to increase the internal temperature without increasing the surface temperature substantially, and thereby to reduce the internal thermal gradients during later drying”. This reduction in internal thermal gradients eliminates the damage and final waste and enables rapid overall drying of the articles, even if they comprise a large amount of "high plasticity" clay.
  • the rapid, well distributed pre-heating is carried out by irradiation of only the inside of the wet ceramic articles using penetrating electromagnetic radiation which "couples" with the water molecules inside the wet ceramic material or article and then absorbs heat energy.
  • the water inside the wet article is heated up much more and quicker than the water on its surface.
  • the environment is kept at room-temperature and a relative humidity of 100% ensuring that drying does not start and no water is removed from the surface of the materials or articles.
  • this is achieved by the use of a large number of intense, compact and specially located sources of electromagnetic radiation which are activated in short pulses according to a pattern which depends on the material under processing.
  • the materials or articles enter the drier where drying takes place.
  • the two diffusion mechanisms - heat diffusion and water diffusion - are both acting outwards during drying instead of one against the other and no thermal stresses are created in the process.
  • the materials or articles in a "green" wet state from the extruder enters the apparatus (1) from the left entrance (2) into the entrance chamber (3) which may incorporate custom-designed openings to ensure no leaks of electro-magnetic radiation.
  • the wet green articles move continuously on wagons or other suitable carrying system.
  • the total maximum output power of the electromagnetic power sources is greater than about 0.1 kW, supplied by one or more generators, and the frequency of electromagnetic radiation to which the wet ceramic material or article is subjected, is between 10MHz and 60GHz.
  • the wet articles are of any material used in ceramic production such as earthenware, clay or other material which is extruded, moulded, or pressed.
  • Each module unit (4) is designed according to the application. A preferred configuration is shown schematically in Fig. 2.
  • the wagons or other means used to carry the wet articles move between two screens (8) which may also support internal generators (9).
  • the position of the external generators (10) depends on the application, see e.g. an alternative arrangement of the external generators (10) in Fig. 2.
  • the modular units (4) are joined together by any mechanical or other joining or welding method to any length required according to the needs of the factory and the prevailing production conditions .

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

La présente invention se rapporte à un procédé et à un appareil de conditionnement thermique de matériaux ou d'articles en céramique humide avant le séchage, qui permettent un séchage rapide et sans craquelure de ces matériaux ou articles céramiques, et qui améliorent la qualité et permettent de réduire les coûts et les délais globaux de production, même pour des produits en argile comportant une forte proportion d'argile à haute plasticité. Ledit procédé permet d'accroître considérablement la productivité d'une usine sans nécessiter une restructuration ou des modifications importantes de l'usine ou du procédé de production. Le procédé de l'invention est caractérisé par une irradiation multi-niveau des matériaux ou articles en céramique humide au moyen de petites sources localisées de rayonnement électromagnétique qui permettent d'augmenter uniformément et rapidement la température de l'eau à l'intérieur de ces matériaux ou articles en céramique humide jusqu'à une température proche du point d'ébullition avant qu'ils ne pénètrent dans le séchoir, la température superficielle des matériaux ou articles céramiques étant maintenue à une valeur inférieure à celle de leur partie centrale sans séchage.
PCT/GR2003/000042 2002-10-01 2003-10-01 Procede et appareil de conditionnement thermique de produits ceramiques humides Ceased WO2004030882A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003264909A AU2003264909A1 (en) 2002-10-01 2003-10-01 Method and apparatus for thermal conditioning of wet ceramic products
EP03798970A EP1615758A1 (fr) 2002-10-01 2003-10-01 Procede et appareil de conditionnement thermique de produits ceramiques humides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GR20020100429A GR1004709B (el) 2002-10-01 2002-10-01 Μεθοδος και συσκευη θερμικης επεξεργασιας κεραμικων προϊοντων για επιταχυνση της ξηρανσης
GR20020100429 2002-10-01

Publications (1)

Publication Number Publication Date
WO2004030882A1 true WO2004030882A1 (fr) 2004-04-15

Family

ID=32051138

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GR2003/000042 Ceased WO2004030882A1 (fr) 2002-10-01 2003-10-01 Procede et appareil de conditionnement thermique de produits ceramiques humides

Country Status (4)

Country Link
EP (1) EP1615758A1 (fr)
AU (1) AU2003264909A1 (fr)
GR (1) GR1004709B (fr)
WO (1) WO2004030882A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064421A1 (fr) 2009-11-30 2011-06-03 Bulma Tecnologia, S.L. Équipement combiné à micro-ondes et à air chaud pour sécher des matériaux de construction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110160337A (zh) * 2018-02-13 2019-08-23 睿明科技股份有限公司 微波干燥装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953703A (en) * 1974-10-03 1976-04-27 Materials Research Corporation Method for drying ceramic tape
DE3602789A1 (de) * 1985-01-30 1986-10-23 Beerwald, Hans, Dr.Rer.Nat., 5370 Kall Hochfrequenz-trocknungsverfahren und vorrichtung zur durchfuehrung des verfahrens
US20020093123A1 (en) * 2001-01-16 2002-07-18 Denso Corporation Method of fabricating honeycomb body and drying system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953703A (en) * 1974-10-03 1976-04-27 Materials Research Corporation Method for drying ceramic tape
DE3602789A1 (de) * 1985-01-30 1986-10-23 Beerwald, Hans, Dr.Rer.Nat., 5370 Kall Hochfrequenz-trocknungsverfahren und vorrichtung zur durchfuehrung des verfahrens
US20020093123A1 (en) * 2001-01-16 2002-07-18 Denso Corporation Method of fabricating honeycomb body and drying system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011064421A1 (fr) 2009-11-30 2011-06-03 Bulma Tecnologia, S.L. Équipement combiné à micro-ondes et à air chaud pour sécher des matériaux de construction

Also Published As

Publication number Publication date
GR20020100429A (el) 2004-05-31
EP1615758A1 (fr) 2006-01-18
GR1004709B (el) 2004-10-25
AU2003264909A1 (en) 2004-04-23

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