WO2017149484A1 - A pressing device - Google Patents

A pressing device Download PDF

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Publication number
WO2017149484A1
WO2017149484A1 PCT/IB2017/051213 IB2017051213W WO2017149484A1 WO 2017149484 A1 WO2017149484 A1 WO 2017149484A1 IB 2017051213 W IB2017051213 W IB 2017051213W WO 2017149484 A1 WO2017149484 A1 WO 2017149484A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressing
presser
pressing device
belt
elements
Prior art date
Application number
PCT/IB2017/051213
Other languages
French (fr)
Inventor
Franco Stefani
Franco Gozzi
Original Assignee
System S.P.A.
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 System S.P.A. filed Critical System S.P.A.
Priority to EP17716627.9A priority Critical patent/EP3423268B1/en
Priority to CN201780013949.7A priority patent/CN108698355B/en
Priority to RU2018129578A priority patent/RU2734313C2/en
Priority to BR112018067290-4A priority patent/BR112018067290B1/en
Priority to MX2018010392A priority patent/MX2018010392A/en
Priority to US16/075,788 priority patent/US10478995B2/en
Publication of WO2017149484A1 publication Critical patent/WO2017149484A1/en

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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
    • B28B3/02—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
    • 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
    • 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
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • 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
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/021—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of definite length
    • 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
    • B30B5/04—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 an endless band
    • B30B5/06—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 an endless band co-operating with another endless band
    • 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
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
    • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
    • B28B5/027—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of the indefinite length type, e.g. belts, and being continuously fed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/44—Compression means for making articles of indefinite length
    • B29C43/48—Endless belts
    • B29C2043/483—Endless belts cooperating with a second endless belt, i.e. double band presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/228—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length using endless belts feeding the material between non-rotating pressure members, e.g. vibrating pressure members

Definitions

  • the present invention relates to a pressing device for ceramic items.
  • the invention relates to a device for pressing ceramic items, designed by the same applicant and known in the sector by publication EP150048, in which the powder material to be pressed is arranged in the form of a layer on a bearing plane constituted by the upper face of a continuous conveyor belt which is supported slidably on a lower presser.
  • the pressing is carried out with an upper presser by means of interposing a continuous loop-wound belt, the external surface whereof is facing towards the continuous conveyor belt.
  • the aim of the present invention is to overcome the drawbacks of the currently available pressing devices.
  • the device according to the present invention offers the important advantage of preventing ceramic powders falling and/or being deposited outside the pressing space.
  • - figure 1 shows a schematic view of the pressing device, shown in a partial section on a vertical plane
  • - figure 1 a shows a schematic view of an alternative embodiment of the pressing device, shown in a partial section on a vertical plane
  • FIG. 1 b shows a schematic view of a further embodiment of the pressing device, shown in a partial section on a vertical plane;
  • FIG. 2 and 3 show a view of the device of figure 1 , shown in a partial section on the plane of trace A-A of figure 1 in two operating configurations;
  • FIG. 4 and 5 show an alternative embodiment of the device according to the present invention, shown in a partial section on the plane of trace B-B of figure 1a in two operating configurations;
  • FIG. 6 - figures 6, 7 and 8 show a further embodiment of the pressing device according to the present invention, shown in partial section on the plane of trace C-C of figure 1 b.
  • the pressing device of the present invention comprises a lower presser (10), provided with a pressing surface (10a) facing upwards, and an upper presser (1 1 ) provided with a pressing surface (1 1 a) facing downwards.
  • the two pressers are part of a press, not illustrated in detail, by which press they are activated to reciprocally near and distance so as to carry out the pressing of a deposited load (L) in the form of a layer of ceramic material.
  • the upper presser (1 1 ) may be provided inferiorly with a forming element (6), applied to its pressing surface (1 1 a), which is structured to delimit an outline on the load (L) along which the material is more greatly compacted.
  • the presence of the forming element (6) is not however essential.
  • the device further comprises a lower belt (2), which has an active portion (3) provided with a bearing surface facing upwards.
  • the active portion (3) is at least partially arranged between the upper presser (1 1) and the lower presser (10).
  • the lower belt (2) is thus arranged with the active portion (3) thereof above the lower presser (10) and below the upper presser (1 1 ).
  • the active portion (3) of the lower belt (2) is movable along an advancement direction (Y) for feeding the layers (L) of material to be pressed into the space comprised between the two pressers (10,1 1 ).
  • the loads (L) to be pressed are deposited on the lower belt (2) upstream of the two pressers, using known means to the person skilled in the art and not illustrated in detail.
  • the lower belt (2) is activated by means of rollers (R) arranged in relation to the pathway to be followed, in a known way in the art. Such rollers have been only schematically represented in figure 1.
  • the pressing device preferably comprises an upper belt (4) provided with an active portion (5) arranged at least partially between the lower belt (2) and the upper presser (1 1).
  • the active portion (5) of the upper belt (4) is movable along the advancement direction (Y) in accordance with the active portion (3) of the lower belt (2). At least for a portion arranged at the pressers (10,1 ), and partially upstream and downstream thereof, the two active portions (3,5) are both parallel to the advancement direction (Y).
  • the upper belt (4) is also activated by means of rollers (R) arranged in relation to the pathway to be followed, in a known way in the art. The rollers have been only schematically represented in the figures.
  • the movable belts (2,4) preferably move at the same speed.
  • the alignment and synchrony between the movable belts (2,4) can be obtained in a known way via a retroactive control.
  • the pressers (10,1 1 ) are separated by a greater distance to allow inlet of the load (L) into the space comprised between the pressers.
  • the active portions (3,5) are parallel to one another and are separated by a distance which enables the inlet of the load (L), the thickness of which, i.e. the height measured perpendicularly to the bearing surface of the lower active portion (3), is smaller than the distance separating the active portions (3,5).
  • the lower presser (10) and the upper presser (1 1 ) delimit overall a pressing space (V) within which the pressing of the load (L) takes place.
  • the pressing device comprises side barriers (13,14,15), which are so arranged as to laterally contain the layer (L) within the pressing space (V).
  • Such side barriers (13,14,15) do not interfere with the movement of the pressers (10, 1 1 ), i.e. they do not influence the pressing of the load (L), and maintain the load (L) within the pressing space (V).
  • the side barriers (13,14,15) prevent particles or parts of the load (L) escaping to the side of the lower belt (2).
  • the side barriers (13,14, 15) are located within the operating area of the pressers (10, 1 1 ), meaning the area inside which the pressers are able to exert pressure. In this way, the side barriers are compressed together with the layer (L), i.e. they perform their containment function throughout the entire pressing cycle.
  • the side barriers (13, 14,15) comprise a pair of lower elements (13), solidly constrained to the lower belt (2) and overall oriented in a direction parallel to the forward direction ( Y).
  • the lower elements (13) project upwards, to the sides of the pressing space (V).
  • the lower elements (13) may be arranged for example in side areas of the lower belt (2).
  • the lower belt (2) may be formed by two or more distinct lengths, joined to one another to form a single belt.
  • the lower elements (13) could be interrupted in the area of the joins between the different lengths.
  • the motion of the lower belt (2) and the depositing of the loads (L) may be handled in such a way that the loads (L) are subsequently deposited at the portions in which the lower elements (13) are present.
  • the lower elements (13) comprise an envelope (13a), which is associated with the lower belt (2) and an inner body (13b) contained within the envelope (13a).
  • the envelope (13a) is preferably made of flexible material.
  • the inner body (13b) is preferably removable from the envelope (13a). This enables inner bodies to be used with different characteristics and thicknesses in relation for example to the thickness of the load (L) to be pressed. As the thickness of the load (L) to be pressed increases, it is possible to use an inner body (13b) with a greater thickness (H), where thickness means the height of the inner body (13b) with respect to the surface area of the lower belt (2).
  • the lower elements (13) are compressed between the pressers, becoming elastically deformed as shown in figure 3.
  • two stacks (1 1 b) may be provided. Such stacks (1 1 b) are preferably arranged on the pressing surface (1 1 a) of the upper presser (1 1 ).
  • the stacks (1 1 b) are substantially conformed in the form of recesses and are aligned on a vertical plane with a respective lower element (13).
  • the side barriers (13, 14, 15) comprise a pair of upper elements (14), solidly constrained to the upper belt (4) and overall oriented in a direction parallel to the forward direction (Y).
  • the upper elements (14) project downwards to the sides of the pressing space (V).
  • the upper elements (14) may be arranged for example in side areas of the upper belt (4).
  • the upper belt (4) may be formed by two or more distinct lengths, joined to one another to form a single belt. In that case the upper elements (14) could be interrupted in the area of the joins between the different lengths.
  • the motion of the upper belt (4) and the depositing of the loads (L) on the lower belt (2) may be handled in such a way that the loads (L) are located in the pressing space (V) simultaneously to the upper elements (14).
  • the upper elements (14) comprise an envelope (14a) solidly constrained to the upper presser (1 1 ), and an inner body (14b), contained within the envelope (14a).
  • the envelope (14a) is made of flexible material.
  • the inner body (14b) is preferably removable from the envelope (14a). This enables inner bodies to be used with different characteristics and thicknesses in relation for example to the thickness of the load (L) to be pressed. As the thickness of the load (L) to be pressed increases, it is possible to use an inner body (14b) with a greater thickness (H), where thickness means the height of the inner body (14b) with respect to the surface area of the upper belt (4).
  • the side barriers (13,14, 15) comprise a pair of upper elements (15), associated with the upper presser (1 1 ) and overall oriented in a direction parallel to the forward direction (Y).
  • the upper elements (15) project downwards from the upper presser (1 1 ), to the sides of the pressing space (V). The upper elements are therefore interposed between the upper presser (1 1) and the active portion (5) of the upper belt (4).
  • the upper elements (15) may be structured to assume an inactive configuration, wherein they have a lower volume, and an active configuration, wherein they have a larger volume.
  • the upper elements (15) are inflatable in order to assume the active configuration.
  • the upper elements (15) are preferably positioned so as not to interfere with the upper belt (4), which remains free to slide during the feeding of the load (L).
  • the upper elements (15) may be positioned to the sides of the active portion (5) of the upper belt (4).
  • the upper elements (15) may be kept in the inactive configuration during the feeding of the load (L) to the pressing space (V), as shown in figure 6, and be brought into the active configuration before the actual pressing step, as shown in figure 7.
  • the upper elements (15) may be associated directly with the upper presser (1 1), or by means of additional supports known to a person skilled in the art.
  • the pressing device according to the present invention achieves important advantages.
  • side barriers (13,14,15) prevents parts or particles of the load (L), even in the case of a thick load (L), escaping from the pressing space (V), becoming deposited in undesired areas of the machine.
  • the side barriers prevent parts of the load (L) being able to fall to the side of the active portion (3) of the lower belt (2). Furthermore, the side barriers do not interfere with the pressing of the load (L).
  • the side barriers along the whole length of the movable belt also have the advantage of preventing parts or particles of the load (L) escaping along the whole of the pressing line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Press Drives And Press Lines (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Abstract

A pressing device, comprising: a lower presser (10), provided with a pressing surface (10a) facing upwards; an upper presser (11), provided with a pressing surface (11a), facing downwards; at least one of the two pressers is movable towards and away relative to the other in order to perform pressing of a layer (L) of a ceramic material; a pressing space (V) delimited inferiorly and superiorly by the lower presser (10) and by the upper presser (11); a lower belt (2), movable along a forward direction (Y) and comprising an active portion (3) arranged at least partially between the upper presser (11) and the lower presser (10); an upper belt (4), movable along the forward direction (Y) and comprising an active portion (5) arranged at least partially between the lower belt (2) and the upper presser (11); two side barriers (13,14,15), arranged to laterally contain the layer (L) within the pressing space (V).

Description

A PRESSING DEVICE
DESCRIPTION
The present invention relates to a pressing device for ceramic items. In particular, the invention relates to a device for pressing ceramic items, designed by the same applicant and known in the sector by publication EP150048, in which the powder material to be pressed is arranged in the form of a layer on a bearing plane constituted by the upper face of a continuous conveyor belt which is supported slidably on a lower presser. The pressing is carried out with an upper presser by means of interposing a continuous loop-wound belt, the external surface whereof is facing towards the continuous conveyor belt.
In the devices currently available it may happen, especially in the presence of thick layers (for example over 30 mm thick), that particles of powder and/or parts of the layer escape from the pressing space, falling to the sides of the continuous conveyor belt. Such an event is absolutely undesirable, since various movable parts of the press are arranged below the continuous conveyor belt, in particular the hydraulic actuator members of the lower piston. Any deposits of ceramic powder could therefore ruin couplings and mechanisms, and comprise the seal of the lower piston.
The aim of the present invention is to overcome the drawbacks of the currently available pressing devices.
In particular, the device according to the present invention offers the important advantage of preventing ceramic powders falling and/or being deposited outside the pressing space.
Further characteristics and advantages of the present invention will become more apparent in the following detailed description of an embodiment of the present invention, illustrated by way of non-limiting example in the attached figures, in which:
- figure 1 shows a schematic view of the pressing device, shown in a partial section on a vertical plane; - figure 1 a shows a schematic view of an alternative embodiment of the pressing device, shown in a partial section on a vertical plane;
- figure 1 b shows a schematic view of a further embodiment of the pressing device, shown in a partial section on a vertical plane;
- figures 2 and 3 show a view of the device of figure 1 , shown in a partial section on the plane of trace A-A of figure 1 in two operating configurations;
- figures 4 and 5 show an alternative embodiment of the device according to the present invention, shown in a partial section on the plane of trace B-B of figure 1a in two operating configurations;
- figures 6, 7 and 8 show a further embodiment of the pressing device according to the present invention, shown in partial section on the plane of trace C-C of figure 1 b.
The pressing device of the present invention comprises a lower presser (10), provided with a pressing surface (10a) facing upwards, and an upper presser (1 1 ) provided with a pressing surface (1 1 a) facing downwards. The two pressers are part of a press, not illustrated in detail, by which press they are activated to reciprocally near and distance so as to carry out the pressing of a deposited load (L) in the form of a layer of ceramic material. The upper presser (1 1 ) may be provided inferiorly with a forming element (6), applied to its pressing surface (1 1 a), which is structured to delimit an outline on the load (L) along which the material is more greatly compacted. The presence of the forming element (6) is not however essential.
The device further comprises a lower belt (2), which has an active portion (3) provided with a bearing surface facing upwards. The active portion (3) is at least partially arranged between the upper presser (1 1) and the lower presser (10). The lower belt (2) is thus arranged with the active portion (3) thereof above the lower presser (10) and below the upper presser (1 1 ). The active portion (3) of the lower belt (2) is movable along an advancement direction (Y) for feeding the layers (L) of material to be pressed into the space comprised between the two pressers (10,1 1 ). The loads (L) to be pressed are deposited on the lower belt (2) upstream of the two pressers, using known means to the person skilled in the art and not illustrated in detail. The lower belt (2) is activated by means of rollers (R) arranged in relation to the pathway to be followed, in a known way in the art. Such rollers have been only schematically represented in figure 1.
The pressing device preferably comprises an upper belt (4) provided with an active portion (5) arranged at least partially between the lower belt (2) and the upper presser (1 1). The active portion (5) of the upper belt (4) is movable along the advancement direction (Y) in accordance with the active portion (3) of the lower belt (2). At least for a portion arranged at the pressers (10,1 ), and partially upstream and downstream thereof, the two active portions (3,5) are both parallel to the advancement direction (Y). The upper belt (4) is also activated by means of rollers (R) arranged in relation to the pathway to be followed, in a known way in the art. The rollers have been only schematically represented in the figures.
During the feeding of a load (L) to the press (10,1 1 ), the movable belts (2,4) preferably move at the same speed. The alignment and synchrony between the movable belts (2,4) can be obtained in a known way via a retroactive control. During this step the pressers (10,1 1 ) are separated by a greater distance to allow inlet of the load (L) into the space comprised between the pressers. In this configuration the active portions (3,5) are parallel to one another and are separated by a distance which enables the inlet of the load (L), the thickness of which, i.e. the height measured perpendicularly to the bearing surface of the lower active portion (3), is smaller than the distance separating the active portions (3,5).
The lower presser (10) and the upper presser (1 1 ) delimit overall a pressing space (V) within which the pressing of the load (L) takes place. To prevent particles or parts of the load (L) escaping from the pressing space (V), deposited in undesired areas, the pressing device comprises side barriers (13,14,15), which are so arranged as to laterally contain the layer (L) within the pressing space (V). Such side barriers (13,14,15) do not interfere with the movement of the pressers (10, 1 1 ), i.e. they do not influence the pressing of the load (L), and maintain the load (L) within the pressing space (V). In particular, the side barriers (13,14,15) prevent particles or parts of the load (L) escaping to the side of the lower belt (2). Preferably, the side barriers (13,14, 15) are located within the operating area of the pressers (10, 1 1 ), meaning the area inside which the pressers are able to exert pressure. In this way, the side barriers are compressed together with the layer (L), i.e. they perform their containment function throughout the entire pressing cycle.
In a first embodiment, illustrated in figures 2 and 3, the side barriers (13, 14,15) comprise a pair of lower elements (13), solidly constrained to the lower belt (2) and overall oriented in a direction parallel to the forward direction ( Y). In the active portion (3) of the lower belt (2), the lower elements (13) project upwards, to the sides of the pressing space (V). The lower elements (13) may be arranged for example in side areas of the lower belt (2).
In a possible embodiment (not shown), the lower belt (2) may be formed by two or more distinct lengths, joined to one another to form a single belt. In that case the lower elements (13) could be interrupted in the area of the joins between the different lengths. The motion of the lower belt (2) and the depositing of the loads (L) may be handled in such a way that the loads (L) are subsequently deposited at the portions in which the lower elements (13) are present.
In the embodiment represented, the lower elements (13) comprise an envelope (13a), which is associated with the lower belt (2) and an inner body (13b) contained within the envelope (13a). The envelope (13a) is preferably made of flexible material. The inner body (13b) is preferably removable from the envelope (13a). This enables inner bodies to be used with different characteristics and thicknesses in relation for example to the thickness of the load (L) to be pressed. As the thickness of the load (L) to be pressed increases, it is possible to use an inner body (13b) with a greater thickness (H), where thickness means the height of the inner body (13b) with respect to the surface area of the lower belt (2).
During the pressing step, the lower elements (13) are compressed between the pressers, becoming elastically deformed as shown in figure 3. To limit the pressure exerted on the lower elements, two stacks (1 1 b) may be provided. Such stacks (1 1 b) are preferably arranged on the pressing surface (1 1 a) of the upper presser (1 1 ). The stacks (1 1 b) are substantially conformed in the form of recesses and are aligned on a vertical plane with a respective lower element (13).
In a further possible embodiment, illustrated in figures 4 and 5, the side barriers (13, 14, 15) comprise a pair of upper elements (14), solidly constrained to the upper belt (4) and overall oriented in a direction parallel to the forward direction (Y). Along the active portion (5) of the upper belt (4), the upper elements (14) project downwards to the sides of the pressing space (V). The upper elements (14) may be arranged for example in side areas of the upper belt (4).
In a possible embodiment (not shown), the upper belt (4) may be formed by two or more distinct lengths, joined to one another to form a single belt. In that case the upper elements (14) could be interrupted in the area of the joins between the different lengths. The motion of the upper belt (4) and the depositing of the loads (L) on the lower belt (2) may be handled in such a way that the loads (L) are located in the pressing space (V) simultaneously to the upper elements (14).
In a possible embodiment, illustrated in figures 4 and 5, the upper elements (14) comprise an envelope (14a) solidly constrained to the upper presser (1 1 ), and an inner body (14b), contained within the envelope (14a). In the same way as for the lower elements (13) described above, the envelope (14a) is made of flexible material. The inner body (14b) is preferably removable from the envelope (14a). This enables inner bodies to be used with different characteristics and thicknesses in relation for example to the thickness of the load (L) to be pressed. As the thickness of the load (L) to be pressed increases, it is possible to use an inner body (14b) with a greater thickness (H), where thickness means the height of the inner body (14b) with respect to the surface area of the upper belt (4).
In a further possible embodiment, illustrated in figures 6, 7 and 8, the side barriers (13,14, 15) comprise a pair of upper elements (15), associated with the upper presser (1 1 ) and overall oriented in a direction parallel to the forward direction (Y). The upper elements (15) project downwards from the upper presser (1 1 ), to the sides of the pressing space (V). The upper elements are therefore interposed between the upper presser (1 1) and the active portion (5) of the upper belt (4).
The upper elements (15) may be structured to assume an inactive configuration, wherein they have a lower volume, and an active configuration, wherein they have a larger volume. For example, the upper elements (15) are inflatable in order to assume the active configuration. The upper elements (15) are preferably positioned so as not to interfere with the upper belt (4), which remains free to slide during the feeding of the load (L). For example, the upper elements (15) may be positioned to the sides of the active portion (5) of the upper belt (4). The upper elements (15) may be kept in the inactive configuration during the feeding of the load (L) to the pressing space (V), as shown in figure 6, and be brought into the active configuration before the actual pressing step, as shown in figure 7. This allows the pressers (10,1 1 ) to be kept very close together in the steps of introducing the load (L), therefore allowing a reduction in the time needed for the pressing stroke of the pressers themselves. During the pressing step, illustrated in figure 8, the upper elements (14) are compressed and deformed, maintaining a delimitation or lateral closure of the pressing space (V).
The upper elements (15) may be associated directly with the upper presser (1 1), or by means of additional supports known to a person skilled in the art.
The pressing device according to the present invention achieves important advantages.
The use of side barriers (13,14,15) prevents parts or particles of the load (L), even in the case of a thick load (L), escaping from the pressing space (V), becoming deposited in undesired areas of the machine. In particular, the side barriers prevent parts of the load (L) being able to fall to the side of the active portion (3) of the lower belt (2). Furthermore, the side barriers do not interfere with the pressing of the load (L).
The side barriers along the whole length of the movable belt also have the advantage of preventing parts or particles of the load (L) escaping along the whole of the pressing line.
/

Claims

A pressing device, comprising:
a lower presser (10), provided with a pressing surface (10a) facing upwards;
an upper presser ( 1), provided with a pressing surface (1 1a) facing downwards; at least one of the two pressers is movable towards and away relative to the other in order to perform pressing of a layer (L) of ceramic material;
a pressing space (V), which is delimited inferiorly and superiorly by the lower presser (10) and the upper presser (1 1 );
a lower belt (2), movable along a forward direction (Y) and comprising an active portion (3) which is disposed at least partially between the upper presser (1 1 ) and the lower presser (10);
an upper belt (4), movable along the forward direction (Y) and comprising an active portion (5), which is disposed at least partially between the lower belt (2) and the upper presser (1 1 );
characterized in that it comprises side barriers (13, 14,15), which are so arranged as to laterally contain the layer (L) within the pressing space (V).
A pressing device according to claim 1 , wherein the side barriers (13, 14, 15) comprise a pair of lower elements (13), which are solidly constrained with the lower belt (2) and overall oriented in a direction parallel to the forward direction (Y).
A pressing device according to claim 2, wherein the lower elements (13) comprise an envelope (13a), which is associated with the lower belt (2) and an inner body (13b) contained within the envelope (13a).
A pressing device according to claim 2, comprising two stacks (1 1 b) aligned with a respective lower element (13) on a vertical plane. A pressing device according to claim 1 , wherein the side barriers (13, 14, 15) comprise a pair of upper elements (14) being solidly constrained with the upper presser (1 1 ) and overall oriented in a direction parallel to the forward direction (Y).
6. A pressing device according to claim 5, wherein the upper elements
(14) comprise an envelope (14a), which is solidly constrained with the upper presser (1 1 ) and an inner body (14b) contained within the envelope (14a).
7. A pressing device according to claim 1 , wherein the side barriers (13,14, 15) comprise a pair of upper elements (15) which are so structured as to take on an inactive configuration, wherein they exhibit a lower volume, and an active configuration, wherein they exhibit a greater volume.
8. A pressing device according to claim 7, wherein the upper elements
(15) are inflatable in order to assume the active configuration.
9. A pressing device according to claim 1 , wherein the side barriers (13, 14, 15) are so structured as to take on an inactive configuration, in which they exhibit a lower volume, and an active configuration, in which they exhibit a greater volume.
10. A pressing device according to claim 9, wherein the side barriers (13, 14, 15) are inflatable in order to take on the active configuration. 11. A pressing device according to claim 1 , wherein the side barriers (13,14, 15) are located within the operating area of the pressers (10,1 1 ), i.e. within an area of the pressers (10, 11 ) inside which the pressers are able to exert pressure.
PCT/IB2017/051213 2016-03-04 2017-03-02 A pressing device WO2017149484A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17716627.9A EP3423268B1 (en) 2016-03-04 2017-03-02 A pressing device
CN201780013949.7A CN108698355B (en) 2016-03-04 2017-03-02 Pressure device
RU2018129578A RU2734313C2 (en) 2016-03-04 2017-03-02 Press device
BR112018067290-4A BR112018067290B1 (en) 2016-03-04 2017-03-02 PRESSING DEVICE
MX2018010392A MX2018010392A (en) 2016-03-04 2017-03-02 A pressing device.
US16/075,788 US10478995B2 (en) 2016-03-04 2017-03-02 Pressing device

Applications Claiming Priority (2)

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IT102016000022906 2016-03-04
ITUA2016A001363A ITUA20161363A1 (en) 2016-03-04 2016-03-04 PRESSING DEVICE

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BR (1) BR112018067290B1 (en)
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EP3895864A1 (en) 2020-04-14 2021-10-20 System Ceramics S.p.A. Press provided with a deaeration system

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RU2734313C2 (en) 2020-10-15
RU2018129578A3 (en) 2020-04-06
CN108698355A (en) 2018-10-23
CN108698355B (en) 2020-11-20
BR112018067290B1 (en) 2024-01-30
EP3423268B1 (en) 2024-08-21
BR112018067290A2 (en) 2019-01-02
RU2018129578A (en) 2020-04-06
US20190061197A1 (en) 2019-02-28
US10478995B2 (en) 2019-11-19
ITUA20161363A1 (en) 2017-09-04
MX2018010392A (en) 2018-12-06
EP3423268A1 (en) 2019-01-09

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