WO2001054874A1 - Moule en platre absorbant destine a la fabrication de corps ceramiques en barbotine, et fabrication de corps ceramiques en barbotine au moyen du moule en platre absorbant - Google Patents

Moule en platre absorbant destine a la fabrication de corps ceramiques en barbotine, et fabrication de corps ceramiques en barbotine au moyen du moule en platre absorbant Download PDF

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Publication number
WO2001054874A1
WO2001054874A1 PCT/EP2001/000940 EP0100940W WO0154874A1 WO 2001054874 A1 WO2001054874 A1 WO 2001054874A1 EP 0100940 W EP0100940 W EP 0100940W WO 0154874 A1 WO0154874 A1 WO 0154874A1
Authority
WO
WIPO (PCT)
Prior art keywords
absorbent
mold
carbon fiber
production
slip
Prior art date
Application number
PCT/EP2001/000940
Other languages
German (de)
English (en)
Inventor
Irmelin Wolf
Peter Schulz
Original Assignee
Wolf Gmbh Feuerfeste Produkte
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 Wolf Gmbh Feuerfeste Produkte filed Critical Wolf Gmbh Feuerfeste Produkte
Priority to AU2001239233A priority Critical patent/AU2001239233A1/en
Publication of WO2001054874A1 publication Critical patent/WO2001054874A1/fr

Links

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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/261—Moulds therefor
    • B28B1/262—Mould materials; Manufacture of moulds or parts thereof
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/261—Moulds therefor
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/145—Carbon only, e.g. carbon black, graphite

Definitions

  • Absorbent gypsum mold for the production of ceramic bodies from slip and production of ceramic bodies from slip using the absorbent gypsum mold
  • the invention relates to an absorbent gypsum mold for producing ceramic bodies from slip using slip casting processes, a method for producing the absorbent gypsum mold and the use of the absorbent gypsum mold for producing ceramic bodies from slip.
  • Ceramic casting compounds also called slips, have an increased water content with liquefying agents, from which more complicated bodies, such as jugs, reliefs, sanitary objects, can be formed with the help of absorbent plaster molds.
  • the invention has for its object to make the production of ceramic bodies from slip, in particular also complicated geometries and smaller series more economical.
  • an absorbent gypsum mold for producing ceramic bodies from slip using slip casting processes is proposed, which is characterized in that it is heatable by means of a cast-in electrical heating conductor based on a carbon fiber sheet.
  • the gypsum mold By producing the gypsum mold with a cast-in heating conductor in the form of a carbon fiber sheet, the gypsum mold can be heated and is already in statu nascendi, i.e. during its own manufacture and, moreover, during later use as a working mold for the slip casting process.
  • the invention enables quick and energy-saving drying of the plaster molds during their manufacture.
  • Flexible carbon fiber sheets are preferably used as heating conductors, which also have the advantage that carbon fibers have a negative expansion coefficient when heated, so that the gypsum mold cannot be destroyed when heated, since no stresses are generated in the gypsum mold.
  • a defined flexible flat structure based on carbon fibers is used as the heating conductor, for example a carbon fiber felt mat or a carbon fiber fabric.
  • carbon fibers with at least 95% C content are used, the carbon fibers should have a resistance of 1.3 to 2 ohms / m.
  • the heating conductor in the plaster form is preferably operated with low voltage up to a maximum of 42 V in order to max. to achieve up to about 70 ° C heating of the carbon fiber sheet. This temperature can be reached within a few minutes. Depending on the quality and quantity of the carbon fiber fabric used, an output of up to 300 W / m 2 can be achieved as heating output.
  • an energy source is one Low-voltage transformer with mains connection provided.
  • the heatable absorbent gypsum mold according to the invention with an electrical heating conductor cast into the gypsum mold based on a carbon fiber sheet is used according to a further embodiment according to the invention for the production of ceramic bodies from slip using a slip casting process, in which the gypsum mold is accelerated to accelerate the formation of fragments of the slip during the execution of the slip casting process Applying a voltage to the electrical heating conductor cast into the plaster mold is heated to a temperature of 30 to 50 ° C. from the inside and via the free outer surface of the plaster mold, the moisture absorbed from the slip is released during the body formation time.
  • Gypsum molds can achieve other positive effects that lead to significant improvements in the production of ceramic bodies from slip using slip casting processes. On the one hand, this is a faster formation of fragments of the ceramic slip. Furthermore, the moisture absorbed by the gypsum mold from the slurry can continuously flow over the free surface of the
  • Gypsum mold avoided during the molding process and thus the entire production process is evened out.
  • the invention of the direct heating of plaster molds for the slip casting process means an important further development of the conventional casting process for the ceramic industry, in particular sanitary parts. With the method according to the invention, it is possible to produce qualitatively improved plaster molds which enable up to 200 impressions to be made using the slip casting method.
  • the uniformity of the temperature during the drying of the slip by penetrating the moisture into the gypsum mold heated from the inside results in an increase in the quality of the ceramic body.
  • oxide ceramic slurries such as fused silica and aluminum oxide are cast at 35 ° C, and here by using a plaster mold, which according to the invention is heated to a temperature during the manufacture of the body at 50 ° C, a strength increase of 30% compared to the use of a not heated plaster mold reached.
  • drying the ceramic body in the gypsum mold heated according to the invention reduces the breakage rate when the ceramic body is molded.
  • the ceramic bodies produced have already achieved a significantly higher drying effect by producing them in a heated gypsum mold compared to an unheated gypsum mold, which increases their raw breaking strength. Cracks due to incorrect drying are largely eliminated.
  • the energy costs for manufacturing slip-cast ceramic bodies by using gypsum molds which can be heated according to the invention and the drying method according to the invention since drying takes place only with a minimal amount, which is adapted to the ceramic body, ie its shape and size.
  • a heated plaster mold G is shown, in which a heating conductor H is embedded from a carbon fiber sheet in the walls so that a uniform heating of the plaster mold G by connecting a corresponding voltage to the connections of the plaster mold led out Heating conductor is enabled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)

Abstract

L'invention concerne un moule en plâtre absorbant (G) destiné à la fabrication de corps céramiques en barbotine au moyen d'un procédé de moulage de barbotine, ledit moule pouvant être chauffé (H). L'invention concerne également un procédé de fabrication desdits moules en plâtre, et l'utilisation du moule en plâtre pour la fabrication de corps céramiques en barbotine.
PCT/EP2001/000940 2000-01-29 2001-01-29 Moule en platre absorbant destine a la fabrication de corps ceramiques en barbotine, et fabrication de corps ceramiques en barbotine au moyen du moule en platre absorbant WO2001054874A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001239233A AU2001239233A1 (en) 2000-01-29 2001-01-29 Absorbent gypsum form for the production of ceramic bodies from slurry and the production of ceramic bodies from slurry by use of the absorbent gypsum form

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2000103945 DE10003945C2 (de) 2000-01-29 2000-01-29 Saugfähige Gipsform zum Herstellen von keramischen Körpern aus Schlicker und Herstellen von keramischen Körpern aus Schlicker unter Verwendung der saugfähigen Gipsform
DE10003945.6 2000-01-29

Publications (1)

Publication Number Publication Date
WO2001054874A1 true WO2001054874A1 (fr) 2001-08-02

Family

ID=7629201

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/000940 WO2001054874A1 (fr) 2000-01-29 2001-01-29 Moule en platre absorbant destine a la fabrication de corps ceramiques en barbotine, et fabrication de corps ceramiques en barbotine au moyen du moule en platre absorbant

Country Status (3)

Country Link
AU (1) AU2001239233A1 (fr)
DE (1) DE10003945C2 (fr)
WO (1) WO2001054874A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910154C (de) * 1951-01-10 1954-04-29 Gottfried Cremer Dr Pressform
US3978183A (en) * 1974-06-24 1976-08-31 Sybron Corporation Method of filter molding and electrical heating unit made thereby
EP0004188A1 (fr) * 1978-03-09 1979-09-19 Sekisui Kagaku Kogyo Kabushiki Kaisha Appareil de chauffage pour la production de chaleur au moyen d'un courant électrique le traversant, procédé pour la fabrication de cet appareil de chauffage et système de chauffage employant un tel appareil
WO1987003158A1 (fr) * 1985-11-14 1987-05-21 A. Ahlstrom Corporation Feuille de resistance electrique et son procede de production
SU1399124A1 (ru) * 1986-07-09 1988-05-30 Украинский Научно-Исследовательский Институт Фарфоро-Фаянсовой Промышленности Способ изготовлени керамических изделий
WO1997035698A1 (fr) * 1996-03-27 1997-10-02 British Ceramic Research Limited Coulage en barbotine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL272562A (fr) * 1960-12-27

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910154C (de) * 1951-01-10 1954-04-29 Gottfried Cremer Dr Pressform
US3978183A (en) * 1974-06-24 1976-08-31 Sybron Corporation Method of filter molding and electrical heating unit made thereby
EP0004188A1 (fr) * 1978-03-09 1979-09-19 Sekisui Kagaku Kogyo Kabushiki Kaisha Appareil de chauffage pour la production de chaleur au moyen d'un courant électrique le traversant, procédé pour la fabrication de cet appareil de chauffage et système de chauffage employant un tel appareil
WO1987003158A1 (fr) * 1985-11-14 1987-05-21 A. Ahlstrom Corporation Feuille de resistance electrique et son procede de production
SU1399124A1 (ru) * 1986-07-09 1988-05-30 Украинский Научно-Исследовательский Институт Фарфоро-Фаянсовой Промышленности Способ изготовлени керамических изделий
WO1997035698A1 (fr) * 1996-03-27 1997-10-02 British Ceramic Research Limited Coulage en barbotine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED Week 198848, Derwent World Patents Index; AN 1988-345251, XP002167320 *

Also Published As

Publication number Publication date
DE10003945A1 (de) 2001-08-23
DE10003945C2 (de) 2001-12-06
AU2001239233A1 (en) 2001-08-07

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