WO2005068146A2 - Method and plant for prearranging powders for forming ceramic tiles or slabs - Google Patents
Method and plant for prearranging powders for forming ceramic tiles or slabs Download PDFInfo
- Publication number
- WO2005068146A2 WO2005068146A2 PCT/IB2005/000025 IB2005000025W WO2005068146A2 WO 2005068146 A2 WO2005068146 A2 WO 2005068146A2 IB 2005000025 W IB2005000025 W IB 2005000025W WO 2005068146 A2 WO2005068146 A2 WO 2005068146A2
- Authority
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- WIPO (PCT)
- Prior art keywords
- plant
- hopper
- powders
- powder
- fall
- Prior art date
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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
-
- 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
- B28B13/0295—Treating the surface of the fed layer, e.g. removing material or equalization of the surface
-
- 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
- B28B3/10—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 each charge of material being compressed against previously formed body
-
- 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
- B28B3/12—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material
- B28B3/123—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein one or more rollers exert pressure on the material on material in moulds or on moulding surfaces moving continuously underneath or between the rollers, e.g. on an endless belt
Definitions
- the present invention relates to a prearrangement method and plant for forming ceramic tiles and slabs.
- Such ceramic tiles or slabs are produced by compacting, by hydraulic presses, semi-dry atomized, ground or re-granulated powders variously mixed together in prearranged or random manner.
- the powder mixtures are deposited by suitable means into the forming cavities of rigid steel moulds with which the presses are provided, and are then pressed to obtain the product.
- suitable means for forming the powder mixtures into the forming cavities of rigid steel moulds with which the presses are provided, and are then pressed to obtain the product.
- the same applicant has already conceived a tile forming method which is described in Italian patent application RE2001A000129.
- This method consists of depositing in the hopper in a prearranged and/or random manner a mixture of powders of different characteristics in such a manner as to create in the hopper a mass of powders presenting veining variously disposed within the mass, the hopper having a discharge mouth of dimensions equal to the dimensions of the cavity of the mould in the forming press, both in the translation direction of the carriage and in the direction perpendicular thereto; withdrawing, in succession from said powder mass, portions having, in the carriage translation direction, a dimension equal to a fraction of the dimension of the hopper mouth, and in the direction perpendicular thereto the same dimension as the hopper mouth, such as to withdraw an entire layer of powders from said mass; depositing said layer in an orderly manner in the interior of said at least one cavity by means of the carriage, and pressing the powders.
- the described method is implemented by a plant comprising a fixed hopper for containing a mixture of powders presenting bulk veining in imitation of a natural stone.
- a plant comprising a fixed hopper for containing a mixture of powders presenting bulk veining in imitation of a natural stone.
- movable means such as a usual loading carriage, arranged to deposit in the cavity a succession of powder portions withdrawn from the hopper, until the cavity is completely filled.
- the object of the present invention is to provide a method for forming ceramic tiles or slabs, particularly but not exclusively in a press of continuous type.
- the present invention provides a plant for forming ceramic tiles or slabs having structural and functional characteristics such as to satisfy the aforesaid requirements while at the same time obviating the stated drawbacks of the known art, in accordance with claim 3.
- Figure 1 is a schematic side view of a first embodiment of the plant according to the invention.
- Figure 2 is a front view of the plant of Figure 1 with the hopper shown in section;
- Figure 3 shows a second embodiment of the present invention
- Figure 4 shows one method of using the plant of Figure 1 ;
- Figures 5 and 6 show two applications of an alternative method of using the plant of Figure 1 ;
- Figure 7 shows a third embodiment of the present invention
- Figure 8 shows a fourth embodiment of the present invention
- Figures 9A-9E show alternative configurations of the discharge aperture of the hopper of the present invention.
- Figure 10 shows a further embodiment of the plant of the present invention.
- the reference numeral 1 indicates overall a plant for forming ceramic tiles or slabs in accordance with the present invention.
- said plant 1 comprises a fall-on surface, which in the example is a conveyor belt 2, above which there are positioned means, indicated overall by 3, for feeding a mixture of powders 33 to create a continuous or discontinuous powder strip 100 on the belt 2, a suction scraping system 4, a continuous pressing station 5 and a cutting station 6.
- Said means for feeding a mixture of powders 33 comprise, in the example of Figure 1 , three conduits 32 for feeding powders 33 of different characteristics and/or colours, a collection surface 31 for the powders and a pusher 30.
- the three conduits 32 are fed with atomized powders 33 by a feed system, not shown, each conduit 32 being fed with powder 33 of a different colour from that of the remaining conduits.
- several conduits 32 can be fed with powder of the same colour, or fed with a preformed mixture of powders of different colour, provided the overall conduits contain powders of at least two different colours.
- the feed conduits 32 are three in number in the illustrated example, they can be of larger or smaller number if desired,
- the conduits 32 are individually slidably supported on guides 320 perpendicular to the axis of the conveyor belt 2.
- the powders 33 are deposited by the feed conduits 32 in prearranged or random manner on the collection surface 31.
- the manner in which the powders 33 are distributed on the collection surface 31 can be controlled by modifying the sequences and times of opening of the various distribution conduits 32, which are provided with shut-off gate valves, not shown.
- the veins typical of a slab of natural stone can be reproduced by suitable horizontal paths which the conduits 32 are made to traverse above the collection surface 31. It is however possible to use fixed powder feed conduits, although the use of movable conduits is preferable.
- the collection surface 31 is disposed substantially horizontal and is preferably provided with opposing vertical side walls 36 for retaining the powders 33.
- the pusher 30, shown in section in the figures, is positioned transverse to the two side walls 36, above the collection surface 31.
- the bottom of the pusher 30 is in contact with the powder fall-on surface of the collection surface 31 and is movable between a withdrawn position and an advanced position, operated by means which are known and therefore not shown.
- the pusher 30 moves along the direction of movement of the underlying belt 2.
- the pusher 30 can be replaced by a movable tray 301 ( Figure 7) which pushes the powders 33 lying on the collection surface 31.
- a hopper 34 At the free edge of the collection surface 31 , i.e. at the edge opposite that occupied by the pusher 30 when in its withdrawn position, there is a hopper 34 which receives the powders 33 urged by the pusher 30 in moving from its withdrawn position to its advanced position.
- the hopper 34 is located vertically on the movable fall-on surface, which in the example is the belt 2, with the loading aperture 37 positioned adjacent to the free edge of the collection surface 31 and the discharge aperture 38 positioned above the belt 2 in proximity to it, however avoiding direct contact with the surface of the belt 2.
- said hopper 34 presents a prismatic shape having two opposing faces substantially perpendicular to the direction of advancement of the belt 2, said faces being positioned at a distance "B" apart substantially equal to the thickness "S" of the powder strip 100 to be compacted.
- the hopper 34 has the shape of a rectangular parallelepiped having the two larger faces, i.e. the front face 34a and the rear face 34b, normal to the direction of advancement of the belt 2 and positioned at a distance "B" apart equal to the thickness of the continuous powder strip 100 which is to be obtained and then compacted.
- the height of the hopper 34 ( Figure 1 ) which is just less than the distance between the collection surface 31 and the advancement plane of the belt 2, is chosen on the basis of the dimensions of the plant 1 such as to ensure that powder 33 is present along the entire width "L" of the discharge aperture 38 ( Figure 2).
- the distance "L” between those hopper faces parallel to the advancement direction is equal to the width of the required continuous powder strip 100, the height dimensions H being generally chosen on the basis of the hopper width L, they varying from 0.2L to 2L, preferably from 0.5L to 1.5L.
- the lower end of the rear face 34b of the hopper 34 can be positioned at a distance "hi" from the surface of the belt 2 of between 0 and S (generally between 0 and 3 mm), where S is the required thickness of the powder strip 100 to be compacted, the front face 34a being positioned at a distance equal to the thickness S of the powder strip 100 to be compacted (Figure 7).
- the front face 34a can be made movable along the powder advancement direction to enable the distance B between the front face 34a and rear face 34b to be varied.
- the rear face 34b or both faces can be made movable.
- the front face 34a and/or the rear face 34b is inclined away from a position perpendicular to the fall-on surface to obtain a lower discharge aperture 38 wider than the upper loading aperture 37 ( Figures 9A-9D).
- the distance between the front face 34a and the rear face 34b of the hopper 34, measured at the discharge aperture 38 is greater than that measured at the loading aperture 37 (equal to "B"), however the distance "B+d" at the discharge aperture 38 should be less than double the distance between the discharge aperture 38 and the fall-on surface.
- the difference "d" between the distance between the two faces 34a, 34b at the discharge aperture 37 and that at the loading aperture 37 should be between 0 and 5 mm, more preferably between 1 and 3 mm.
- its faces can have their lower ends, which define the discharge aperture 38, shaped with radii of curvature Ri, Re ( Figure 9A) such as to facilitate emergence of the powders 33 from the hopper 34 in the advancement direction, so preventing any outflow velocity differences which could be encountered with a hopper 34 with flat faces.
- the radius of curvature Ri of the front face 34a can vary from 0 to 2 times the thickness of the powder strip 100 to be compacted, and the radius of curvature Re of the rear face 34b from 2 to 4 times the thickness of the powder strip 100 to be compacted.
- Said rotary roller 41 extends axially along the entire width L of the front face 34a, bounding the discharge aperture 38, and is positioned such that its revolving surface is tangential to the inner surface of said front face 34a, and is spaced from the surface of the belt 2 by a distance equal to the thickness S of the required powder strip 100.
- the distance "B" at the discharge aperture 38 should be substantially equal to said thickness "S" of the powder strip 100 so that, by virtue of the roller 41 , the powders 33 can be advantageously transferred onto the belt 2 while maintaining substantially unaltered the arrangement which they possessed within the hopper 34; this advantage is particularly useful when said arrangement is able to give the powder strip 100 a predetermined desired graphical appearance, for example the typical veining of natural stone.
- the rotary roller 41 can be mounted idly such that its rotation is induced by friction with the powders 33 as these pass from the hopper 34 to the belt 2.
- said roller 41 can be motorized and rotated such that its peripheral speed is equal to and in the same direction as the advancement speed of the belt 2; this can be achieved by connecting the roller 41 to an independent gearmotor, or connecting it via a suitable transmission system to the drive members for the belt 2.
- the rotary roller 41 can be braked, i.e. associated with a braking device to slow it down relative to the outflow speed of the powder 33 within the hopper 34, and hence relative to the speed of the belt 2.
- the central plane of the hopper 34 can be inclined with a predefined inclination " ⁇ " to the advancement direction of the powder strip 100 to be compacted (Figure
- the actual weight of the powders 33 in the hopper 34 acts substantially only on the rear face 34b, to advantageously reduce mixing of the powder layers lying at the front face 34a, which are those defining the upper visible part of the leaving powder strip 100.
- this embodiment enables them to be transferred onto the belt 2 while preventing their excessive distortion.
- the suitably manipulated feed conduits for the powders 33 deposit by gravity the powders 33 contained in them onto the collection surface 31 , to reproduce the desired veining.
- the pusher 30 is driven from its withdrawn position to its advanced position, to urge the mass of powders 33 towards the hopper 34, positioned vertically over the belt 2, to then return to its withdrawn position and enable a new loading cycle for the powders 33.
- the mass of powders 33 on arriving in the hopper 34 by gravity, settles gradually from the bottom thereof upwards towards the discharge aperture 38.
- the mass of powders 33 deposited continuously in the hopper 34 reproduces throughout its bulk a slab of natural stone, lying vertically in a direction perpendicular to the belt 2.
- This slab represented in practice by the continuous powder strip 100, deposits on the belt 2 by gravity during the belt advancement, while maintaining the previously obtained arrangement of the powders 33 within the hopper 34.
- the suction scraping system 4 comprising a usual device 40 for scraping the upper surface of the powder strip 100.
- Said suction system 4 illustrated schematically but not described in detail as it is of known type, enables a thin surface layer of powders to be removed from the strip 100 such as to highlight the arrangement and contrast of the different coloured powders present in the powder strip 100.
- the powder strip 100 guided by the belt 2, then reaches the continuous pressing station 5, also of known type.
- Said pressing station 5 comprises a compactor belt 50 positioned above the conveyor belt 2 to compact the powder strip 100 and obtain a continuous compacted article. Essentially, compacting takes place between the surface of the conveyor belt 2 and the surface of the overlying parallel compactor belt 50.
- the powder strip 100 is laterally retained on the belt 2 by laterally providing, parallel to the advancement direction of the belt 2, containment means which in the example are two lateral containing walls 35, only one of which is visible in the figures. Said containment walls 35 preferably extend as far as the termination of compaction.
- the compaction effected with the compactor belt 50 is sufficient to obtain a compacted article which requires no further compaction, however in certain cases compaction forms a manipulable pre-compacted article intended for subsequent final compaction.
- the article is divided into slabs of predefined dimensions in the cutting station 6 by usual cutting devices.
- said cutting station 6 comprises two rotary blades 60 for cutting in the direction perpendicular to the advancement direction of the belt 2, and at least a further two rotary blades 61 , only one of which is visible in the figures, for cutting the compacted article in the advancement direction of the belt 2.
- the described plant 1 is managed by a processor, not shown, which controls its operation.
- the plant 1 can present a double system for feeding the hopper 34 (Figure 3).
- a double system for feeding the hopper 34 ( Figure 3).
- a further collection surface 31' also provided with feed conduits 32' for the powders 33' and a pusher 30', which are identical to those already described and are located in a position symmetrical thereto about the axis of the hopper 34.
- the double feed means 3 and 3' the operation of the two means can be synchronized to create a continuous powder strip 100 on the belt 2, hence improving continuity of powder discharge from the hopper 34.
- the feed means 3 comprise, in addition to those already shown in Figure 1 , a powder loading hopper 322 and a feed conveyor belt 321.
- a powder loading hopper 322 and a feed conveyor belt 321.
- both the basic coloured powders from the powder loading hopper 322 and the powders of different nature and/or colour originating from the conduits 32 fall onto the generally horizontally disposed feed conveyor belt 321 , with prearranged paths controlled by suitable electronic control systems, not shown.
- the feed belt 321 discharges the powders preloaded in this manner onto the collection surface 31 for the powders 33.
- the feed belt 321 can be fixed in one position, or be synchronized (or not synchronized) with the stroke of the pusher 30.
- the plant 1 is provided with a second feed system 3' totally similar to the preceding and disposed symmetrical therewith about a vertical plane of symmetry through the hopper 34 ( Figure 7).
- a loading head 400 with multiple tubes is positioned exactly above the loading aperture 37 of the hopper 34, as visible in Figure 7. This head 400 directly discharges into the hopper 34 without passing via the feed belt 321 or pusher 30 (or tray 301 ), achieving further effects, in particular layers and veins which are very thin and pronounced compared with the powder mass.
- the method and plant for forming ceramic tiles and slabs of the present invention can also be used to deposit a powder layer 100' on the surface of a continuous monochromatic base slab 200 (Figure 5) previously obtained using means of the known art, indicated overall by 7 and 8.
- Said means of the known art comprise, for example, a discharge conduit 7, a hopper 70, a levelling rod 72 for regulating the thickness of said base slab 200, and a possible station 80 arranged to provide slight compacting of the material, to avoid possible "remixing" of the base slab 200 with the powder layer 100'.
- the veining effect obtainable with the method and plant 1 of the present invention does not extend through the entire mass of the final slab, but only through the surface part, obtaining a saving of coloured powders, which are more costly than the materials of the base slab.
- the mixture of powders 33 leaving the hopper discharge mouth 38 arrives on the base slab 200, which in this second case represents the fall-on surface for the powders 33.
- a further alternative is that shown in Figure 6, in which the powders present in the hopper are deposited discontinuously onto a tile 201 previously formed by a first discontinuous pressing system 300. After applying the surface powder layer 100', the tile 201 is conveyed by rollers 303 to a second pressing system, for example a discontinuous pressing system 302 ( Figure 6).
- the hopper 34 with a gate valve, not shown, which can be closed when necessary, to prevent outflow of powders 33 in the absence of the tile below the discharge aperture 38.
- a loading tray 250 is used as the fall- on surface, associated with a carriage sliding with reciprocating movement along a surface 340 to deposit within a cavity 320 a layer 120 of powders withdrawn from the hopper 34, to be compacted by usual means, such as a punch 350.
- the dimensions of the carriage 250 are such as to allow loading of a powder layer 120 having a thickness S equal to the distance B between the faces 34a, b of the hopper 34.
- a suitable gate valve can be avoided by using instead a closure plate 330 extending from the rear of the carriage 250 such as to close the discharge aperture 38 even when in its advanced position for depositing the powder layer 120 into the cavity 320.
- one of the faces (front 34a or rear 34b) of the hopper 34 can consist of a vertical portion of an endless movable belt 39 passing about three rollers, to accompany the material discharged onto it in a manner similar to that already described.
- the peripheral speed of the belt 39 is substantially equal to that of the belt 2.
- the belt 39 can convey agglomerated materials into the hopper 34, so that they deposit on the surface of the powders 100 to be compacted.
- the method and plant of the present invention enable the requirements to be satisfied while overcoming those drawbacks stated in the introduction to the present description with reference to the known art.
- the method and plant of the present invention enable ceramic slabs of the desired thickness to be continuously formed with bulk motifs reproducing the veining of natural stone.
- said method and relative plant enable the veining formed in the powder mixture present in the hopper to be quickly and efficiently transferred onto the ceramic slab.
- the powder mixture distribution within the hopper is preserved for forming the powder strip to be compacted.
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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)
Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05702196A EP1701830A2 (en) | 2004-01-08 | 2005-01-03 | Method and plant for prearranging powders for forming ceramic tiles or slabs |
MXPA06007668A MXPA06007668A (en) | 2004-01-08 | 2005-01-03 | Method and plant for prearranging powders for forming ceramic tiles or slabs. |
CN2005800018127A CN1906001B (en) | 2004-01-08 | 2005-01-03 | Method and plant for prearranging powders for forming ceramic tiles or slabs |
BRPI0506669-7A BRPI0506669A (en) | 2004-01-08 | 2005-01-03 | method for forming ceramic tiles or plates, and installation for pre-laying powders for forming ceramic tiles or plates |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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ITRE2004A000001 | 2004-01-08 | ||
ITRE20040001 ITRE20040001A1 (en) | 2004-01-08 | 2004-01-08 | METHOD AND PLANT FOR THE PREPARATION OF THE POWDERS FOR THE FORMING OF TILES OR CERAMIC SLABS |
Publications (2)
Publication Number | Publication Date |
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WO2005068146A2 true WO2005068146A2 (en) | 2005-07-28 |
WO2005068146A3 WO2005068146A3 (en) | 2005-10-27 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2005/000025 WO2005068146A2 (en) | 2004-01-08 | 2005-01-03 | Method and plant for prearranging powders for forming ceramic tiles or slabs |
Country Status (7)
Country | Link |
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EP (1) | EP1701830A2 (en) |
CN (1) | CN1906001B (en) |
BR (1) | BRPI0506669A (en) |
IT (1) | ITRE20040001A1 (en) |
MX (1) | MXPA06007668A (en) |
RU (1) | RU2006123124A (en) |
WO (1) | WO2005068146A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
MXPA06007668A (en) | 2007-01-26 |
WO2005068146A3 (en) | 2005-10-27 |
CN1906001A (en) | 2007-01-31 |
BRPI0506669A (en) | 2007-05-15 |
EP1701830A2 (en) | 2006-09-20 |
RU2006123124A (en) | 2008-02-20 |
CN1906001B (en) | 2010-05-05 |
ITRE20040001A1 (en) | 2004-04-08 |
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