EP0865888A1 - Form zum Isostatischen Pressen von Keramikfliesen und Verfahren zu deren Herstellung - Google Patents

Form zum Isostatischen Pressen von Keramikfliesen und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0865888A1
EP0865888A1 EP98104765A EP98104765A EP0865888A1 EP 0865888 A1 EP0865888 A1 EP 0865888A1 EP 98104765 A EP98104765 A EP 98104765A EP 98104765 A EP98104765 A EP 98104765A EP 0865888 A1 EP0865888 A1 EP 0865888A1
Authority
EP
European Patent Office
Prior art keywords
insert
punch
punch according
elastic positioning
membrane
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.)
Granted
Application number
EP98104765A
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English (en)
French (fr)
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EP0865888B1 (de
Inventor
Nunzio Annovi
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.)
Annovi Srl
Original Assignee
Annovi Srl
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Filing date
Publication date
Application filed by Annovi Srl filed Critical Annovi Srl
Publication of EP0865888A1 publication Critical patent/EP0865888A1/de
Application granted granted Critical
Publication of EP0865888B1 publication Critical patent/EP0865888B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/024—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form the pressure on the material being transmitted through flexible or resilient wall parts, e.g. flexible cushions on the ramming surface, resilient wall parts pressing as a result of deformation caused by ram pressure
    • 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
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/346—Manufacture of moulds

Definitions

  • the invention concerns an isobaric punch for pressing ceramic tiles and a method for making said punch.
  • dies for ceramic tiles comprising a punch body provided with a plurality of intercommunicating cavities containing oil, said cavities being closed at an active end by an elastic membrane; inside each cavities a respective piston, peripherally provided with a sealing ring, is interposed between the oil and the membrane.
  • isobaric dies are also known, in which membrane control elements are provided, instead of pistons, which are kept at an intermediate position in the respective cavities by means of positioning elements which are squashed, or broken, or somehow neutralized, after the vulcanization of the membrane, thus releasing the control elements which are so free to move towards the powders to be pressed, or in opposite direction, due to the action, respectively, of the oil, or of the powders.
  • positioning elements made of elastic material are described, which are interposed between the bottom of each cavity and the central portion of each control element.
  • the control elements may be relatively unstable and, sometimes, may tend to block in the respective cavities when they are non uniformly stressed by the powders.
  • the particular allocation of the elastic positioning elements makes necessary to carry out the vulcanization with the cavities turned downwards, to avoid the fluid material, from which the membrane will be made, filling said cavities completely.
  • Aim of the present invention is to improve the dies for pressing ceramic powders eliminating the drawbacks indicated above.
  • an isobaric punch for pressing ceramic tiles comprising a punch body provided with intercommunicating cavities containing an incompressible fluid and having an end which is closed by an elastic membrane, the other end being provided with a bottom portion, a respective rigid insert, cooperating with respective elastic positioning means, being accommodated inside each cavities, each said insert being facing, on one side, said membrane and, on the opposite side, being in contact with the respective elastic positioning means, characterized in that said elastic positioning means have an annular shape.
  • said elastic means are received in a corresponding annular seat provided in said bottom portion.
  • each rigid insert has a central zone and a peripheral zone, the peripheral zone having a thickness which is less than the thickness of the central zone.
  • a peripheral sealing element is interposed between each rigid insert and the membrane, to avoid the leakages of liquid plastic material during vulcanization.
  • a method for making an isobaric die for pressing ceramic tiles comprising, in succession, preparing a die body with intercommunicating cavities having respective openings facing upwards, inserting an elastic positioning element and a respective rigid insert into each cavity, as well as vulcanizing a membrane in elastic material on the rigid inserts and on the said die body, characterized in that, during vulcanization, a pressure is exerted on the rigid inserts, said pressure being such as not to deform the elastic positioning elements, which are active during pressing.
  • sealing means are located on the rigid inserts, said sealing means being suitable to prevent portions of said material from penetrating into said cavities, during vulcanization.
  • An isobaric punch 1 for pressing ceramic tiles 2 inside a matrix 3, comprises an elastic membrane 4 vulcanized on the outer face of the punch and reproducing, in negative, the back side of the tile 2.
  • the punch 1 is provided with a plurality of cavities 5, obtained in the punch body in the areas amongst supporting appendixes 6 of the tile.
  • the membrane 4 is provided with corresponding grooves 7 corresponding to the appendixes 6.
  • the cavities 5 are intercommunicating through a series of holes 8 obtained in the punch body in such a way as to form a circuit, closed by a screw cap 13, wherein some oil is injected.
  • each cavity 5 there is accommodated a respective insert 9 which is free to move, during pressing, towards the tile 2, or away from it, depending on the local density of the powders forming the said tile.
  • Each insert 9 has, preferably, an edge portion 10 having a reduced thickness, to avoid blockings even when the combined action of the powders and of the oil forces the insert to tilt with respect to the relevant cavity 5.
  • annular shaped elastic means 11 for example consisting of a ring having circular section and preferably inserted into an annular seat 12 of each cavity.
  • the annular shaped elastic means 10 acts itself as a gasket element when, in making the punch, a liquid resin is poured onto the inserts and onto the free surface of the punch body to form the membrane 4.
  • each insert may be directly in contact with the membrane 4 without interposition of any gasket element.
  • each insert 4 with a disk-shaped gasket element 14, which is located on each insert before the resin being poured, or before the rubber being applied.
  • the gasket element may consist of a ring 15 like the annular shaped elastic means 11, so as to obtain a reduction of the variety of pieces forming the punch 1.
  • Figure 5 shows that the disk-shaped gasket element 14 may have a central hole 16 to facilitate anchoring of the membrane 4 to the respective insert, so that, when it is necessary to remove the membrane for regenerating the die, the inserts stay attached to the membrane and follow it, so emptying automatically the respective cavities.
  • each insert 9 may have, upon its face facing the membrane 4, a depression 17, which is advantageously truncated-cone shaped, for further improving anchoring of the membrane to the inserts 9.
  • the depression 17 may extend up to the periphery of the insert 9, so defining a raised edge 18 which may be wrapped up by a lip 19 of the elastic medium underneath, which includes, for example, a ring 20 with rectangular section.
  • the presence of the lip 19 constitutes a further guarantee against blocking of the insert 9 in the respective cavity 5, because it makes even impossible any contact between the insert and the lateral walls of the cavity, avoiding, in this way, blockings or seizures.
  • the annular shaped elastic means 20 may even not require the presence of the raised edge 18 of the insert 9, i.e. the lip 19 may simply wrap up the outer peripheral surface of the insert 9.
  • the cavities may be made communicating with each other by means of through-openings 21 obtained on the walls 22 which define the cavities 6, or by means of holes 24 converging in a V-shaped formation.
  • the elastic means may have a semicircular section 23, in such a way as to have greater yieldingness during pressing.
  • the various forms of cross section of the elastic means make the insert 9 more or less freely movable.
  • an insert with circular section may enter the respective cavity owing to forces which are less than forces that should be required if the insert would be provided with a rectangular or square section having corresponding dimensions.
  • the elastic means in its various versions, should substantially not alter its form and dimensions during the vulcanization of the membrane 4, so that the inserts 9 are allowed to stay in an intermediate position in the respective cavity up to solidification of the membrane 4.
  • the form of the inserts 9 and of their respective edge 10 having less thickness, is such that the central portion protrudes towards the bottom of the cavity 5.
  • the central portion may constitute a stop means of the motion of the insert towards the bottom of the cavity to prevent the elastic means from being damaged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP98104765A 1997-03-18 1998-03-17 Form zum Isostatischen Pressen von Keramikfliesen und Verfahren zu deren Herstellung Expired - Lifetime EP0865888B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO970043 1997-03-18
IT97MO000043A IT1292690B1 (it) 1997-03-18 1997-03-18 Punzone isobarico per la pressatura di piastrelle ceramiche e metodo per la fabbricazione di detto punzone.

Publications (2)

Publication Number Publication Date
EP0865888A1 true EP0865888A1 (de) 1998-09-23
EP0865888B1 EP0865888B1 (de) 2003-08-13

Family

ID=11386286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104765A Expired - Lifetime EP0865888B1 (de) 1997-03-18 1998-03-17 Form zum Isostatischen Pressen von Keramikfliesen und Verfahren zu deren Herstellung

Country Status (3)

Country Link
EP (1) EP0865888B1 (de)
DE (1) DE69817049D1 (de)
IT (1) IT1292690B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1403016A3 (de) * 2002-09-24 2005-09-28 Alfredo Missana Form zum unidirektionalen Pressen von pulverförmigen Materialien, insbesondere keramischen Gemengen
WO2006095254A3 (en) * 2005-03-09 2006-11-30 Mira Di Algeri Maris Isostatic pressing means
EP2586580A1 (de) * 2011-10-24 2013-05-01 MARTINELLI ETTORE S.r.l. Einstellbare Stanze zum Pressen von Keramikprodukten wie Fliesen und dergleichen
WO2020058906A1 (en) * 2018-09-19 2020-03-26 Siti - B&T Group S.P.A. Process for the manufacture of slabs of ceramic and/or stone material
IT202100014210A1 (it) * 2021-05-31 2022-12-01 Annovi S R L Tampone isostatico per la pressatura di polveri ceramiche

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701889A2 (de) * 1994-09-13 1996-03-20 Maris Algeri Form zum isostatischen Pressen von Keramikfliesen und Verfahren zum Herstelllen der Fliesen
EP0759346A1 (de) * 1995-08-18 1997-02-26 Carlo Antonio Camorani Form zur isostatischen Pressen und Verfahren zu deren Herstellung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0701889A2 (de) * 1994-09-13 1996-03-20 Maris Algeri Form zum isostatischen Pressen von Keramikfliesen und Verfahren zum Herstelllen der Fliesen
EP0759346A1 (de) * 1995-08-18 1997-02-26 Carlo Antonio Camorani Form zur isostatischen Pressen und Verfahren zu deren Herstellung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1403016A3 (de) * 2002-09-24 2005-09-28 Alfredo Missana Form zum unidirektionalen Pressen von pulverförmigen Materialien, insbesondere keramischen Gemengen
WO2006095254A3 (en) * 2005-03-09 2006-11-30 Mira Di Algeri Maris Isostatic pressing means
EP2586580A1 (de) * 2011-10-24 2013-05-01 MARTINELLI ETTORE S.r.l. Einstellbare Stanze zum Pressen von Keramikprodukten wie Fliesen und dergleichen
WO2020058906A1 (en) * 2018-09-19 2020-03-26 Siti - B&T Group S.P.A. Process for the manufacture of slabs of ceramic and/or stone material
IT202100014210A1 (it) * 2021-05-31 2022-12-01 Annovi S R L Tampone isostatico per la pressatura di polveri ceramiche

Also Published As

Publication number Publication date
DE69817049D1 (de) 2003-09-18
ITMO970043A1 (it) 1998-09-18
EP0865888B1 (de) 2003-08-13
IT1292690B1 (it) 1999-02-11

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