EP0860256A1 - Verfahren zum Fördern keramischen Pulvers aus einer Entnahmestelle nach einem Benutzungsgebiet - Google Patents

Verfahren zum Fördern keramischen Pulvers aus einer Entnahmestelle nach einem Benutzungsgebiet Download PDF

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Publication number
EP0860256A1
EP0860256A1 EP98102126A EP98102126A EP0860256A1 EP 0860256 A1 EP0860256 A1 EP 0860256A1 EP 98102126 A EP98102126 A EP 98102126A EP 98102126 A EP98102126 A EP 98102126A EP 0860256 A1 EP0860256 A1 EP 0860256A1
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EP
European Patent Office
Prior art keywords
diaphragm
powder
air
region
porous
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.)
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Application number
EP98102126A
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English (en)
French (fr)
Inventor
Guiseppe Cassani
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.)
Sacmi Imola SC
Original Assignee
Sacmi Imola SC
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Filing date
Publication date
Application filed by Sacmi Imola SC filed Critical Sacmi Imola SC
Publication of EP0860256A1 publication Critical patent/EP0860256A1/de
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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
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • B28B13/022—Feeding several successive layers, optionally of different materials

Definitions

  • the present invention relates to a method for transferring ceramic powder from a pick-up region to a utilization region, particularly for transferring ceramic powder into the mold of a tile-making press.
  • powder is transferred with transfer systems consisting of conveyors or channels which connect a pick-up region (silos, hoppers) to a utilization region (press loading trolleys).
  • transfer systems consisting of conveyors or channels which connect a pick-up region (silos, hoppers) to a utilization region (press loading trolleys).
  • powder is fed to the mold of a press by a trolley which comprises a grid and is actuated with a back-and-forth motion between a position that lies below a loading hopper, whereat the grid is filled with ceramic powder, and an unloading position, whereat the powder is discharged from the grid into the recesses of an underlying ceramic press mold.
  • the grid After filling the recesses, the grid, during the return stroke below the hopper, removes the excess powder by skimming.
  • the ceramic powder undergoes uncontrollable mixing and, in the case of press loading grids, the skimming effect produces a different compaction of the powder in the recesses, particularly proximate to the edges of the recesses.
  • This different compaction can lead to the molding of tiles having uneven thickness (i.e., wedge-shaped) which thus tend to deform irregularly during baking in the kiln.
  • the aim of the present invention is to provide a new powder transfer method which allows to overcome the limitations of conventional methods and, in relation to the feeding of a press, to obviate the shortcomings in terms of uncontrollable mixing in the recesses of the mold.
  • an object of the present invention is to provide a method which allows to achieve aesthetic effects which cannot be achieved with conventional methods.
  • a method for transferring ceramic powder from a pick-up region to a utilization region characterized in that it comprises: depositing the ceramic powder on a porous medium which is permeable to air but not to the powder, so as to produce a layered arrangement of powder; placing on said layered arrangement a porous diaphragm which is permeable to air but not to the powder; connecting said diaphragm to a suction source, so that a portion of said layered arrangement having a preset size continues to adhere to said diaphragm; transferring said portion onto the utilization region; connecting said suction diaphragm to a source of air in overpressure, so that said portion separates from said porous diaphragm and is deposited on said region.
  • the method is characterized in that it comprises: depositing the ceramic powder on a porous supporting surface which is permeable to air but not to the powder, so as to produce a layered arrangement of powder; placing on said layered arrangement a porous diaphragm which is permeable to air but not to the powder; connecting said diaphragm to a suction source, so that a portion of said layered arrangement having dimensions that correspond to those of a recess of said mold continues to adhere to said diaphragm; vertically transferring and positioning said portion on the recess of said mold; connecting said suction diaphragm to a source of air in overpressure, so that said portion separates from said porous diaphragm and is deposited in said recess.
  • the layered arrangement of powder is obtained in a containment element whose dimensions correspond to those of the recess of the mold of the press.
  • the suction diaphragm is advantageously associated with a duct which can be connected to a source of suction or air in overpressure; said duct, together with said diaphragm, forms a compartment for containing the portion removed from said formation.
  • the suction diaphragm closes a duct which can be connected to a source of suction or air in overpressure so that the portion removed from said layered arrangement is external to the mouth of said duct.
  • the reference numeral 1 designates a horizontal supporting surface, made of a porous material which allows the through passage of air but not of the ceramic powder wherewith the tiles are to be formed.
  • the ceramic powder is deposited on the surface 1 and shaped so as to produce a layered arrangement 2 having the chosen thickness.
  • the reference numeral 3 designates a duct which can be connected, through a selector valve, to a source of suction or of air in overpressure.
  • the mouth of the duct 3 is closed by a porous diaphragm 4 whose porosity is such as to allow the passage of air but not of the ceramic powder.
  • the diaphragm 4 is located inside the mouth of the duct 3 so as to delimit a compartment 5 which is substantially as high as the arrangement 2 is thick.
  • the duct 3 is subjected to a movement thanks to which, during a first step, the duct 3 is rested on the porous surface 1, so that a portion of the layered arrangement 2 occupies the compartment 5.
  • said duct 3 is connected to the suction source, so that the layered portion 6 is retained in the compartment 5 against the diaphragm 4.
  • the duct 3 is transferred onto a recess 7 of a mold of a ceramic press, formed by a containment rim 8 and by a punch 9.
  • a fourth step the duct 3 is rested on the containment rim 8 so that the mouth of the duct 3 is centered on the edge of the recess 7.
  • suction is deactivated and the duct 3 is connected to a source of air in overpressure.
  • Said overpressure causes the portion 6 to exit from the containment compartment 5 and to be deposited in the recess 7.
  • the compaction whereto the ceramic powder is subjected in the compartment 5 by virtue of the suction prevents the portion 6 from flaking during transfer into the mold of the press.
  • Figure 1 illustrates a solution wherein the recess 7 is higher than the portion 6 is thick, so that above the portion 6, once it has been deposited in the recess 7, there is still an empty space wherein an additional layer of material can be deposited.
  • the recess 7 is as high as the portion 6 is thick; the upper surface of said portion is flush with the upper face of the containment rim.
  • the invention perfectly achieves the intended aim and object.
  • the method allows to fill the recess 7 without altering the structure of the aspirated portion, thus maintaining a uniform density of the powder in all the regions of the recess.
  • the portion 6 in fact falls into the recess without undergoing compaction and mixing, as instead occurs with conventional loading grids.
  • Another advantage is the possibility to prepare the powder on the supporting surface 1 according to requirements, for example providing depressions or the like which can be transferred into the recess and thus allowing to obtain aesthetic effects which cannot be obtained with conventional methods.
  • Figures 4 and 5 illustrate an embodiment wherein the portion to be transferred into the recess of the mold of the press is obtained by filling suitable cavities 10 formed in the porous supporting surface 2, thus forming decorated tiles 11.
  • the porous diaphragm 4 is arranged flush with the edge of the mouth of the duct 3 so that the decorated tile 11 made of ceramic powder removed by suction from the cavity 10 is retained outside the duct and can be deposited into the recess 7 of the mold.
  • the compartment 7 delimited by the containment rim 8 and by the punch 9 can be higher than (figure 4), or as high as (figure 6), the removed decorated tile.
  • Figure 7 illustrates a different embodiment which uses a duct 3 provided with a containment compartment 5 (such as the one described in relation to the method of figures 1 to 3) and with a cavity 10 (such as the one described in relation to the method of figures 4 to 6).
  • the dimensions of the duct 3 are such that the duct engages in the cavity 10, so that the decorated tile 11 fully occupies the compartment 10.
  • the steps for removing and depositing the decorated tile in the recess 7 of the mold proceed as described above.
  • the method according to the present invention is not limited to the transfer of the powder into the recesses of the mold of a ceramic press but can also be applied to the transfer of the powder into the grid of a ceramic press.
  • the powder deposited by the duct 3 in the grid in fact undergoes a significantly reduced mixing, which does not appreciably alter its physical and aesthetic characteristics.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Detergent Compositions (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP98102126A 1997-02-21 1998-02-06 Verfahren zum Fördern keramischen Pulvers aus einer Entnahmestelle nach einem Benutzungsgebiet Withdrawn EP0860256A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO970080 1997-02-21
IT97BO000080A IT1290692B1 (it) 1997-02-21 1997-02-21 Procedimento per il trasferimento di polvere ceramica da una zona di prelievo in una di utilizzo.

Publications (1)

Publication Number Publication Date
EP0860256A1 true EP0860256A1 (de) 1998-08-26

Family

ID=11341969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98102126A Withdrawn EP0860256A1 (de) 1997-02-21 1998-02-06 Verfahren zum Fördern keramischen Pulvers aus einer Entnahmestelle nach einem Benutzungsgebiet

Country Status (2)

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EP (1) EP0860256A1 (de)
IT (1) IT1290692B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997248A3 (de) * 1998-09-28 2000-12-20 Carlo Antonio Camorani Verfahren und Vorrichtung zur Übertragung von körnigem Material
EP1256428A3 (de) * 2001-04-27 2004-01-02 Daniele Lamberti Verfahren zum Füllen von Formen für Fliesen, Vorrichtung zur Anwendung des Verfahrens und mittels des Verfahrens hergestellte Fliesen
WO2006095249A3 (en) * 2005-03-09 2006-11-30 Mira Di Algeri Maris Method and apparatus for transferring granular material to a mould
EP1900491A3 (de) * 2006-09-14 2010-10-06 LAEIS GmbH Verfahren und Presse zum Herstellen von Formkörpern
CN101015934B (zh) * 2007-02-14 2010-12-01 徐平 一种陶瓷砖转移印花装置及该装置的转移印花方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970223A (en) * 1974-04-04 1976-07-20 Longinotti S.P.A. Material metering units
FR2444543A1 (fr) * 1978-12-21 1980-07-18 Longinotti Spa Appareillage destine a charger une sous-couche dans un moule pour la fabrication de carreaux de ciment et utilisations equivalentes
DE3941346A1 (de) * 1988-12-15 1990-06-21 Murata Manufacturing Co Verfahren zur herstellung von mehrschichtkondensatoren
EP0444730A2 (de) * 1990-02-26 1991-09-04 L.B. Officine Meccaniche S.P.A. Schieber zur Zweistufenbefüllung von Keramikformen, insbesondere zur Herstellung druckglasierter Keramikplatten
EP0693352A2 (de) * 1994-07-21 1996-01-24 L.B. Engineering S.R.L. Vorrichtung zur Füllung eines Füllwagens für Formkasten während der Herstellung von keramischen Platten
WO1996015888A1 (en) * 1994-11-22 1996-05-30 Carlo Antonio Camorani A method for compacting powders, and a relative apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970223A (en) * 1974-04-04 1976-07-20 Longinotti S.P.A. Material metering units
FR2444543A1 (fr) * 1978-12-21 1980-07-18 Longinotti Spa Appareillage destine a charger une sous-couche dans un moule pour la fabrication de carreaux de ciment et utilisations equivalentes
DE3941346A1 (de) * 1988-12-15 1990-06-21 Murata Manufacturing Co Verfahren zur herstellung von mehrschichtkondensatoren
EP0444730A2 (de) * 1990-02-26 1991-09-04 L.B. Officine Meccaniche S.P.A. Schieber zur Zweistufenbefüllung von Keramikformen, insbesondere zur Herstellung druckglasierter Keramikplatten
EP0693352A2 (de) * 1994-07-21 1996-01-24 L.B. Engineering S.R.L. Vorrichtung zur Füllung eines Füllwagens für Formkasten während der Herstellung von keramischen Platten
WO1996015888A1 (en) * 1994-11-22 1996-05-30 Carlo Antonio Camorani A method for compacting powders, and a relative apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997248A3 (de) * 1998-09-28 2000-12-20 Carlo Antonio Camorani Verfahren und Vorrichtung zur Übertragung von körnigem Material
EP1256428A3 (de) * 2001-04-27 2004-01-02 Daniele Lamberti Verfahren zum Füllen von Formen für Fliesen, Vorrichtung zur Anwendung des Verfahrens und mittels des Verfahrens hergestellte Fliesen
WO2006095249A3 (en) * 2005-03-09 2006-11-30 Mira Di Algeri Maris Method and apparatus for transferring granular material to a mould
EP1900491A3 (de) * 2006-09-14 2010-10-06 LAEIS GmbH Verfahren und Presse zum Herstellen von Formkörpern
CN101015934B (zh) * 2007-02-14 2010-12-01 徐平 一种陶瓷砖转移印花装置及该装置的转移印花方法

Also Published As

Publication number Publication date
IT1290692B1 (it) 1998-12-10
ITBO970080A1 (it) 1998-08-21
ITBO970080A0 (it) 1997-02-21

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