EP0701889B1 - Isostatic die for pressing ceramic tiles and method for manufacturing the tiles - Google Patents

Isostatic die for pressing ceramic tiles and method for manufacturing the tiles Download PDF

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Publication number
EP0701889B1
EP0701889B1 EP95202233A EP95202233A EP0701889B1 EP 0701889 B1 EP0701889 B1 EP 0701889B1 EP 95202233 A EP95202233 A EP 95202233A EP 95202233 A EP95202233 A EP 95202233A EP 0701889 B1 EP0701889 B1 EP 0701889B1
Authority
EP
European Patent Office
Prior art keywords
die
membrane
joint
tile
tiles
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
EP95202233A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0701889A2 (en
EP0701889A3 (en
Inventor
Maris Algeri
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
Priority claimed from IT94MO000127 external-priority patent/IT1269252B/it
Priority claimed from ITMO940175 external-priority patent/IT1269288B/it
Application filed by Individual filed Critical Individual
Publication of EP0701889A2 publication Critical patent/EP0701889A2/en
Publication of EP0701889A3 publication Critical patent/EP0701889A3/en
Priority to EP19960202189 priority Critical patent/EP0759346B1/en
Priority to ES96202189T priority patent/ES2166860T3/es
Application granted granted Critical
Publication of EP0701889B1 publication Critical patent/EP0701889B1/en
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
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/001—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • 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
    • B30B5/02—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 a flexible element, e.g. diaphragm, urged by fluid pressure

Definitions

  • the invention concerns a die for pressing ceramic tiles and a relative manufacturing method.
  • IT-A-1104511 discloses a method for manufaturing ceramic tiles in which tiles are pressed under the action of an elastic modelling membrane, for example, made of rubber, delimiting a chamber in a respective semi-die in which an incompressible fluid, for example, oil, is introduced; by means of such a die it is possible to make the density of the pressed tiles homogeneous so as to limit undesired dimensional variations during subsequent firing.
  • an elastic modelling membrane for example, made of rubber
  • IT-A-1104511 also proposes the use of stiffening plates applied to the external surface of the elastic modelling membrane to limit excessive deformation in the membrane.
  • IT-A-1104511 whilst introducing the fundamental concept of homogeneous pressing of ceramic tiles, has been found to be subject to a tendency towards a non uniform thickness of the pressed items.
  • the areas corresponding to the support ribbing of the tile are not as well pressed and consequently the corresponding areas on the opposite face have a greater porosity, with an unacceptable variation in the surface finish and a considerable reduction, in these areas, in the mechanical strength of the support.
  • IT-U-214739 proposes a die for ceramic tiles in which the body of a punch has a plurality of intercommunicating seats, filled with oil or other incompressible fluid, in which are inserted, with wet seal, pistons sliding in them in order to impart differentiated degree of compaction in the various zones of the mass of powders during pressing. Between the active ends of the said pistons and the powders to be pressed there is an elastically deformable membrane acting as a coating for the surface of the punch.
  • the prior art also comprises a die described in IT-A-MO93A000068 in which the elastic membrane, on the side opposite to that in contact with the powders for forming the tile, is equipped with appendages, for example, each consisting of a cover made of an elastic material, preformed and co-operating with the walls of the alveolus to which the said cover is attached and on whose base its lower rim rests: during vulcanisation the said elastic cover forms an integral part of the said membrane, closing off the alveolus and so enabling the chamber for the incompressible fluid to remain free, delimited by the internal surface of the same cover.
  • appendages for example, each consisting of a cover made of an elastic material, preformed and co-operating with the walls of the alveolus to which the said cover is attached and on whose base its lower rim rests: during vulcanisation the said elastic cover forms an integral part of the said membrane, closing off the alveolus and so enabling the chamber for the incompressible fluid to remain free, delimited
  • Another aspect of the same technical problem being that of reducing the manufacturing costs of the isobaric dies.
  • the invention resolves the said technical problem by adopting die means for isobaric pressing of ceramic tiles by means of an active surface, comprising a die body having a plurality of intercommunicating cavities containing an incompressible fluid, each cavity accomodating a respective tablet element, characterized in that, between each tablet element and the die body a joint is defined having a looped form, said joint having one internal side in contact with said incompressible fluid and one external side forming a part of said active surface, the joint extending between said internal side and said external side leaving substantially no gaps between said internal side and said external side.
  • the tablets allow displacements of the membrane only in planes substantially parallel to the forming plane: this achieves, with a given displacement of the tablets, the compaction of a greater volume of powder than is possible with a membrane that deforms in curved configurations; conversely, with a given volume of powder displaced in compensating for the non homogeneous loading of the matrix of the die, the displacement of the tablets in planes parallel to the forming planes is much less than that which would be required with curved deformations of the parallel to the forming plane afford a better compensation of pressing, also in the areas close to the ribbing, or appendages, where significant lack of homogeneity can be found when using prior art dies.
  • a die for ceramic tiles 41 comprises at least one semi-die 1, that is, a punch insertable into a matrix M ( Figure 3), having an elastic membrane 2, anchored peripherally to a frame 3 of the semi-die 1, and having, on its external face, a surface 4 having the profile of one of the faces of tile to be formed, for example, the rear face.
  • the tiles 41 are pressed in the matrix M between a first punch 1 a a second punch PZ.
  • grooves 5, or indents may be provided to form the projections in the rear face of the tile, to enable it to be laid and/or transported during the various phases of the production cycle.
  • a plurality of tablets 48 for example, quadrangular, is inserted so as to be floating in corresponding seats 49, or cavities.
  • the tablets 48 have any plan view shape, for example, polygonal with rounded vertices, for example, rectangular, or square, or circular, or whichever other convenient shape.
  • the seats 49 are intercommunicating by means of channels 60 and 61 for the incompressible fluid: the seats 49 are preferably flared upwards and in any case such as to enable the formation, during vulcanisation, of lips 50a in the membrane 2 wrapping round each tablet 48 so as to incorporate it into the relative membrane.
  • Anchorage appendages 19c may be provided in the membrane 2 opposite to the grooves 5 for insertion into corresponding seats 44: the anchorage appendages 19c give the membrane further possibility of adjusting its trim in equilibrium with the incompressible fluid when the pressing load is applied, in such a way as to guarantee an isostatic pressing also in the areas corresponding to the supports of the tiles.
  • Figures 4, 5 show how in this version the membrane 2 is anchored to a plurality of anchoring elements 51 having a "T"-shaped cross-section, for anchoring the said membrane in undercut: these elements also being provided with transverse through holes 52 to further improve anchoring.
  • the tablets 48 are of considerable thickness and have smooth lateral surfaces 53, so as to co-operate with sealing rings 54 intended to prevent, during vulcanisation, leakage of the elastomer material the membrane 2 is made of towards the underlying seats 55, said seats constituting integral parts of the chamber 7 for the incompressible fluid; the sealing rings 54 are inserted in stepped grooves 56 in the side walls of the seats 55.
  • stepped grooves 57 for said sealing rings may be made in the side walls of the tiles 48.
  • the tablets 48 can be positioned so that they are in contact with the bottom of the corresponding cavity 55 or raised from it, for example with the positioning between them of a fluid material, for example, granular, such as sand S, that is expelled after forming.
  • a fluid material for example, granular, such as sand S, that is expelled after forming.
  • the sealing rings 54 in order to allow a greater flexibility and to improve sealing against oil leakage from cavity 7, can be inserted in stepped seats 56a having a diameter which is essentially greater than the external diameter of the corresponding sealing element 54.
  • the membrane 2 can have a smooth external surface 59 ( Figure 8) during the vulcanisation phase with matrix 23, the grooves, or cavities, 5 being obtained with the deformation of the membrane only with the introduction of the pressurised fluid in the cavity 7.
  • the seats 55 for the tablets 48 are an integral part of the cavity 7 in which the incompressible fluid F is contained and can be made intercommunicating by means of channel 62 which has an axis bent in the shape of a "V" to connect one seat directly with the one adjacent to it.
  • annular joint 68 made of the material of the membrane 2 that favour the floating movement of each tile 48.
  • the membrane 2 can be limited to the ensemble of annular joints 68, that is, tablets 48a do not have to be lined with the elastomer material on its active face in pressing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP95202233A 1994-09-13 1995-08-18 Isostatic die for pressing ceramic tiles and method for manufacturing the tiles Expired - Lifetime EP0701889B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19960202189 EP0759346B1 (en) 1995-08-18 1996-08-05 Isostatic pressing means
ES96202189T ES2166860T3 (es) 1995-08-18 1996-08-05 Medio de prensado isostatico.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
IT94MO000127 IT1269252B (it) 1994-09-13 1994-09-13 Stampo isobarico per la pressatura di manufatti ceramici, in particolare piastrelle, con membrana a tenuta di fluido perfezionata
ITMO940127 1994-09-13
ITMO940141 IT1269262B (it) 1994-09-13 1994-10-11 Stampo isobarico per la pressatura di piastrelle ceramiche, e metodo relativo
ITMO940141 1994-10-11
ITMO940175 IT1269288B (it) 1994-12-28 1994-12-28 Metodo per la formatura della membrana elastica nello stampo isobarico per piastrelle ceramiche e stampo relativo
ITMO940175 1994-12-28

Publications (3)

Publication Number Publication Date
EP0701889A2 EP0701889A2 (en) 1996-03-20
EP0701889A3 EP0701889A3 (en) 1996-07-10
EP0701889B1 true EP0701889B1 (en) 2002-07-24

Family

ID=27274119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202233A Expired - Lifetime EP0701889B1 (en) 1994-09-13 1995-08-18 Isostatic die for pressing ceramic tiles and method for manufacturing the tiles

Country Status (5)

Country Link
EP (1) EP0701889B1 (es)
AT (1) ATE220975T1 (es)
DE (1) DE69527479D1 (es)
ES (1) ES2179860T3 (es)
IT (1) IT1269262B (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1279893B1 (it) * 1995-12-18 1997-12-18 F D S S R L Semistampo per piastrelle ceramiche perfezionato
DE19629413A1 (de) * 1996-07-22 1998-01-29 Erlus Baustoffwerke Keramischer Falzdachziegel
IT1292690B1 (it) * 1997-03-18 1999-02-11 Annovi S R L Punzone isobarico per la pressatura di piastrelle ceramiche e metodo per la fabbricazione di detto punzone.
ES2181511B2 (es) * 1999-05-19 2003-12-16 Vicente Rafael Fernandez Punzon hidraulico con deposito de aceite incorporado.
IT1315606B1 (it) * 2000-03-07 2003-03-14 Franco Bagni Semistampo perfezionato per la pressatura di manufatti ceramici.
WO2006095254A2 (en) * 2005-03-09 2006-09-14 Mira Di Algeri Maris Isostatic pressing means
ITRE20050033A1 (it) * 2005-03-25 2006-09-26 Cbm Srl Punzone ceramico tipo marca
IT201600079937A1 (it) * 2016-07-29 2018-01-29 I Dea Re S R L Tampone per la formatura di piastrelle
IT201900002749A1 (it) * 2019-02-26 2020-08-26 Officina Ferrari Carlo Spa Tampone per la pressatura di polveri

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1160590A (en) * 1967-03-20 1969-08-06 Yuken Kogyo Co Ltd An improved method and apparatus for the manufacture of Dish-Shaped Ceramic Articles
US4370120A (en) * 1978-11-28 1983-01-25 Foster Robert D Compacting press with expandable body
US4937025A (en) * 1987-09-30 1990-06-26 Hydra Corporation Molding apparatus and method
EP0620089B1 (en) * 1993-03-17 1996-12-11 Maris Algeri Isostatic die, particularly for ceramic tiles and relative method
IT1262344B (it) * 1993-12-21 1996-06-19 Mass Spa Metodo e impianto per la formatura di piastrelle a compattazione e spessore uniformi, e piastrelle cosi' ottenute.

Also Published As

Publication number Publication date
ATE220975T1 (de) 2002-08-15
ITMO940141A1 (it) 1996-04-11
ES2179860T3 (es) 2003-02-01
IT1269262B (it) 1997-03-26
ITMO940141A0 (it) 1994-10-11
EP0701889A2 (en) 1996-03-20
DE69527479D1 (de) 2002-08-29
EP0701889A3 (en) 1996-07-10

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