EP2384870A1 - Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique - Google Patents

Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique Download PDF

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Publication number
EP2384870A1
EP2384870A1 EP10425148A EP10425148A EP2384870A1 EP 2384870 A1 EP2384870 A1 EP 2384870A1 EP 10425148 A EP10425148 A EP 10425148A EP 10425148 A EP10425148 A EP 10425148A EP 2384870 A1 EP2384870 A1 EP 2384870A1
Authority
EP
European Patent Office
Prior art keywords
die
base
membrane
hole
deformable wall
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.)
Withdrawn
Application number
EP10425148A
Other languages
German (de)
English (en)
Inventor
Lauro Silvestrini
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.)
Officina Ferrari Carlo SpA
Original Assignee
Officina Ferrari Carlo SpA
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 Officina Ferrari Carlo SpA filed Critical Officina Ferrari Carlo SpA
Priority to EP10425148A priority Critical patent/EP2384870A1/fr
Publication of EP2384870A1 publication Critical patent/EP2384870A1/fr
Withdrawn legal-status Critical Current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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/44—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for treating with gases or degassing, e.g. for de-aerating
    • 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
    • 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
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0008—Venting channels, e.g. to avoid vacuum during demoulding or allowing air to escape during feeding, pressing or moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
    • B30B15/0017—Deairing means

Definitions

  • the invention relates to dies for forming ceramic tiles, and more in particular, one of the two dies which realised the forming cavity of the die.
  • usual ceramic dies comprise a forming cavity for containing powder ceramic material, which is delimited by a lateral containing matrix in which a bottom die is received, which collaborates with an overlying top die such as to coin the flat opposite surfaces of the tile.
  • the prior art comprises isostatic dies which comprise a metal body provided with an active surface destined to face towards the inside of the forming cavity of the die, provided with a concentric cavity which is superiorly closed by an elastic membrane, which is anchored to the metal body in a plurality of predetermined zones and which is destined to be in contact with the mass of ceramic powders in order to coin one of the flat surfaces of the tile.
  • the above-described concentric cavity is filled with an incompressible pressurised fluid which inflates the elastic membrane at the zones in which it is not anchored to the metal body.
  • the air contained in the forming cavity must necessarily flow towards the outside.
  • this stage is usually defined as the degassing stage, and is necessary in order to prevent grave defects in the finished ceramic product from emerging, deriving from the presence of residual air trapped in the pressed unfired tile.
  • the air flow generally runs from the centre of the forming cavity towards the periphery, where it exits by passing into the space (usually tenths of a millimetre) existing between the edge of the dies and the lateral containing matrix.
  • the phenomenon is very relevant in isostatic dies due to the realising of large-format tiles, where the air trapped at the centre has to move along a long tract before discharging at the edges of the die.
  • a drawback in the pressing of ceramic tiles is also the time required for all the air present in the forming cavities to exit completely, such as to obtain a perfect degassing.
  • a further drawback consists in the fact that the wear on ceramic dies is mainly determined by the above-cited degassing air current which, as it contains abrasive particles, causes premature wear on the edges of the dies and the matrix.
  • the aim of the invention is thus to at least partly obviate the abovementioned drawbacks, facilitating the unloading of the air from the forming cavity, while at the same time preventing rapid wear of the ceramic dies, and increasing plant productivity.
  • a further aim of the invention is to attain these objectives in the ambit of an effective, simple and rational solution with contained costs.
  • the invention provides, in its simplest version, i.e. in a case where the dies are not isostatic, a die comprising a metal base provided with an upper elastic membrane resting on the base and destined to come into contact with the ceramic powder.
  • the metal base is provided with discharging conduits which open out on the surface to which the membrane is fixed or on which it is resting, and flow into manifold channels located in communication with the outside of the metal base.
  • the membrane comprises at least a channel, part of a lattice of channels designed to be the rest feet of the tile.
  • the membrane assumes a conical conformation, with the cavity facing towards the conduit, and provided with a small hole in the top.
  • the die of the invention can also be of the isostatic type, in which case the membrane is solidly anchored to the base at least around the conduits, and simply rests on the remaining part of the base.
  • the air contained in the forming cavity can flow externally through the discharge system of conduits afforded in the metal base of the die.
  • the invention comprises the most complex of the discharging conduits being connected to a special aspirating device.
  • the aspirating device is activated each time that the die has completed a certain number, relatively high, of pressing cycles, such as to clean the discharge conduits by aspirating the ceramic powder contained therein.
  • Figures from 1 to 4 illustrate a metal base 1 having a lowered upper surface 2 on which the elastic membrane 3 rests.
  • a portion 11 subjected to heat treatment for anti-wear hardening runs along the upper edge of the metal base.
  • the elastic membrane is made of an elastomer material of known type for this use and is applied to the base by means of usual systems, also well known to experts in the field.
  • the metal base which constitutes, with the elastic membrane, the die, is located slidably internally of a matrix (not illustrated).
  • the metal base is inferiorly coupled to a shoe 4 .
  • the conduits 5 are afforded in the base 1 body and are uniformly distributed and arranged in alignments at which the shoe 5 exhibits corresponding manifolds 6 into which the conduits 5 of each alignments open.
  • the membrane 3 exhibits a lowered lattice 31, destined to create the rear rest lattice of the tile.
  • At least the channels 31 of the central part of the membrane 3 are located at the alignments of the conduits 5.
  • the base of the respective channel 31 exhibits a circular hole 32 on the side facing the base, the circular hole 32 having the same diameter as the underlying conduit 5.
  • the hole is superiorly closed by a slim deformable wall 33 conformed as a cone and provided at the centre thereof with a small hole 34.
  • conduits 5 have a 5 mm diameter, and the hole 34 has a 1 mm diameter, while the thickness of the deformable wall is slightly greater than the diameter of the hole 34.
  • a cylindrical bushing 7 is located at the outlet of each conduit 5 in the surface 2, which cylindrical bushing 7 has an internal diameter which is substantially the same as the diameter of the underlying conduit 5 and is provided with a recessed flat upper edge 71 which functions as a rest for the deformable wall 33, preventing flexion thereof internalwise.
  • the invention functions as follows.
  • the set aims are thus attained.
  • the degassing of the powder is homogeneous, and this prevents migration of the powder towards the periphery of the die and the consequent damage to the tile decoration.
  • the pressing can be concluded in a single pressing, with a reduction by about a half of the time required for pressing each tile (from about 6 seconds to about 3 seconds).
  • the invention is not limited to the above-described examples, and any variants and improvements can be brought thereto without its forsaking the ambit of the claims that follow.

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)
EP10425148A 2010-05-04 2010-05-04 Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique Withdrawn EP2384870A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10425148A EP2384870A1 (fr) 2010-05-04 2010-05-04 Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10425148A EP2384870A1 (fr) 2010-05-04 2010-05-04 Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique

Publications (1)

Publication Number Publication Date
EP2384870A1 true EP2384870A1 (fr) 2011-11-09

Family

ID=42977974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10425148A Withdrawn EP2384870A1 (fr) 2010-05-04 2010-05-04 Moule pour la fabrication de carreaux en céramique équipé d'une expulsion d'air automatique

Country Status (1)

Country Link
EP (1) EP2384870A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161432A1 (it) * 2016-03-07 2017-09-07 Siti B & T Group Spa Pressa per la realizzazione di prodotti ceramici

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1021285B (de) * 1954-01-08 1957-12-19 Wilhelm Ludowici Dr Ing Mit einem nachgiebigen UEberzug aus Gummi od. dgl. versehene Metallform zum Pressen keramischer Massen
JPH04156321A (ja) * 1990-10-19 1992-05-28 Toyoda Gosei Co Ltd 成形用金型
EP1106336A1 (fr) * 1999-12-03 2001-06-13 Ronflette S.A. Dispositif pour chasser l'air emprisonné dans un matériau en poudre fine lors d'un cycle de pressage pour la fabrication d'objets en céramique
EP1882571A1 (fr) * 2006-07-26 2008-01-30 Ta-Ro Progetti s.n.c. di Tagliati Rodolfo E C. Moule isostatique pour formation de carreau

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1021285B (de) * 1954-01-08 1957-12-19 Wilhelm Ludowici Dr Ing Mit einem nachgiebigen UEberzug aus Gummi od. dgl. versehene Metallform zum Pressen keramischer Massen
JPH04156321A (ja) * 1990-10-19 1992-05-28 Toyoda Gosei Co Ltd 成形用金型
EP1106336A1 (fr) * 1999-12-03 2001-06-13 Ronflette S.A. Dispositif pour chasser l'air emprisonné dans un matériau en poudre fine lors d'un cycle de pressage pour la fabrication d'objets en céramique
EP1882571A1 (fr) * 2006-07-26 2008-01-30 Ta-Ro Progetti s.n.c. di Tagliati Rodolfo E C. Moule isostatique pour formation de carreau

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20161432A1 (it) * 2016-03-07 2017-09-07 Siti B & T Group Spa Pressa per la realizzazione di prodotti ceramici
WO2017153913A1 (fr) * 2016-03-07 2017-09-14 Siti - B&T Group S.P.A. Presse pour la production de produits céramiques

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