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WO2016135545A1 - Printing device and machine for printing ceramic tiles or slabs - Google Patents

Printing device and machine for printing ceramic tiles or slabs Download PDF

Info

Publication number
WO2016135545A1
WO2016135545A1 PCT/IB2015/060005 IB2015060005W WO2016135545A1 WO 2016135545 A1 WO2016135545 A1 WO 2016135545A1 IB 2015060005 W IB2015060005 W IB 2015060005W WO 2016135545 A1 WO2016135545 A1 WO 2016135545A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
printing
printing device
enamel
solenoid valves
Prior art date
Application number
PCT/IB2015/060005
Other languages
French (fr)
Inventor
Roberta CROCI
Original Assignee
G.Tech S.R.L.
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 G.Tech S.R.L. filed Critical G.Tech S.R.L.
Publication of WO2016135545A1 publication Critical patent/WO2016135545A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/04Apparatus or processes for treating or working the shaped or preshaped articles for coating or applying engobing layers
    • B28B11/048Apparatus or processes for treating or working the shaped or preshaped articles for coating or applying engobing layers by spraying or projecting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01Embodiments of or processes related to ink-jet heads
    • B41J2202/05Heads having a valve

Definitions

  • the present invention relates to a device (or printhead) and a printing machine for ceramic tiles or slabs, particularly for the screen printing or imprinting by using high volume enamels on ceramic plate-like objects. Therefore, the present invention finds particular application in ceramic manufacturing industry, and particularly in enamelling and staining (screen for example) of tiles or the like.
  • each printing device consists of a number of piezoelectric valves arranged in succession, each defining a varnish delivery nozzle.
  • each valve involves the use of a deformable crystal that, once excited with variable voltage as a function of a driving signal, allows for the passage of a predetermined amount of enamel.
  • Such nozzles are all defined by piezoelectric actuators, each associated with a separate enamel tank.
  • such a device is usable for only the ejection and distribution of enamels with low/mid volume, in which the particles have dimensions (i.e. diameter) much lower to a hundredth of a millimetre (in the order of microns or of tens of micron).
  • Object of the present invention is to provide a printing device and machine for ceramic tiles or slabs that overcome the drawbacks of the prior art mentioned above.
  • object of the present invention is to provide a printing device and machine for ceramic tiles or slabs, which allow the delivery of high volume enamels.
  • object of the present invention is to provide a printing device for ceramic tiles or slabs structurally simple and easy to be maintained or replaced.
  • a printing device for ceramic tiles or slabs comprising a containment body having at least one operating face provided with a plurality of printing nozzles and a plurality of solenoid valves for the delivery of enamel, each solenoid valve being associated with an enamel tank and a printing nozzle.
  • the valves are solenoid valves.
  • the delivery solenoid valves are each associated with a printing nozzle and extend between an outlet mouth, located at the nozzle, and an inlet mouth, associated with an enamel tank.
  • the delivery solenoid valves each comprise a tubular body, a shutter movable inside the tubular body, and an activation/driving coil or solenoid.
  • the tubular body develops within the containment body from the outlet mouth, located at the operating face, away therefrom.
  • the solenoid valves have a shutter having a first portion embedded into said tank, associated with a respective nozzle and movable towards and away therefrom between a locking position, in which it occludes the nozzle, and a releasing position, in which it allows the delivery of enamel.
  • the presence of solenoid valves in place of piezoelectric valves allows to increase the volume of enamel to be treated and delivered, allowing the printing and screen printing even with high volume enamels, e.g. containing pigments with particle size greater than 10 ⁇ , particularly comprised between 10 and 30 ⁇ .
  • the enamel tank is housed in the containment body.
  • the printing device comprises a card for driving the solenoid valves placed within the containment body and associated to the coil or solenoid of each solenoid valve.
  • the printing device is substantially self- sufficient, i.e. stand-alone, requiring simply a link to enamel pumping circuit to be operative.
  • the printing machine comprises a frame comprising at least a plane, a rod extending along its own main direction and facing to said plane, movement means for the bar along a direction transverse to said main direction, and a plurality of printing devices according to the present invention connected to the bar and arranged in succession along said main direction.
  • such devices are removable and releasable from the bar without having to remove or dismount other components, thus making very easy the maintenance of the system.
  • FIG. 1 shows an exploded perspective view of a first embodiment of a printing device for ceramic tiles or slabs according to the present invention
  • FIG. 2 shows a cross-sectional view of the device of Figure 1 ;
  • FIG. 3 shows a cross-sectional view of an alternative embodiment of a printing device for ceramic tiles or slabs according to the present invention;
  • FIG. 4 shows a bottom view of the device of Figure 1 or 3, in an assembled condition
  • FIG. 5 shows a plan view of a printing machine for ceramic tiles or slabs according to the present invention.
  • number 1 indicates a printing device (or printhead) for ceramic tiles or slabs according to the present invention.
  • the printing device 1 (or printhead) is thus preferably used within a more complete printing machine 100 for ceramic tiles or slabs in general.
  • the machine 100 (and thus the device 1 ) is therefore used for printing, staining and enamelling of ceramic plate-like elements, as tiles, by using special enamels.
  • the performable processes are screen printing type processes or the creation of "structures”.
  • the enamels usable for printing by the device 1 according to the present invention are water-based enamels both at low and high volume.
  • high volume is meant define those enamels containing particles of considerable size, generally higher than a tenth of a millimetre, which normally are not processable and dispensable by known printing devices, such as the piezoelectric devices.
  • enamels having a particle size (of the pigments) greater than 10 ⁇ , preferably between 10 and 30 ⁇ .
  • the printing machine 100 thus comprises a frame 101 comprising at least a plane 101 a on which the ceramic tiles or slabs are laid, with the face to be processed (i.e. to be stained) facing away from the plane 101 a.
  • a printing bar 103 is associated, which is adapted to realize the staining.
  • the bar 103 extends along its own main direction "A" and facing to said plane 101 a.
  • the bar 103 is made as a portal above the plane 101 a facing hereto.
  • movement means 104 are also associated, which are configured to move it along a direction transverse to said main direction "A".
  • the machine 100 is provided with a plurality of printing devices 1 connected to the bar 103 and arranged in succession along the main direction "A".
  • the machine 100 also includes an enamel-pumping circuit (not shown), connected to an enamel primary vessel and provided with one or more recirculation pumps.
  • a control unit 107 is connected to the pump and devices for activating them according to a drawing or the preset degree of colouration.
  • the pumping circuit operates at a pressure comprised between 1 and 10 bar, preferably about 3 bar.
  • the printing devices 1 are arranged in succession to each other on at least a first 105 and a second row 106 arranged side by side.
  • the devices 1 of the first row 105 are offset relative to the devices of the second row 106.
  • the resolution of the printing is increased until also 58 or 60 dpi.
  • the device or head 1 i.e., the main object of the present invention, it comprises a containment body 2 having at least one operating face 3 provided with a plurality of printing nozzles 4.
  • the containment body 2 is thus preferably defined by a box-like body 5 having at least one base 5a (or first base) and a side enclosure 5b delimiting a containment volume "V".
  • the side enclosure 5b comprises a plurality of side walls angled to each other to define a polygonal perimeter of the containment body 2.
  • the base 5a defines the operating face 3 and is thus provided with a plurality of holes defining the printing nozzles 4.
  • the nozzles 4 are arranged in succession along a predetermined extension direction "B".
  • the nozzles 4, and thus the holes formed in the base 5a are aligned along at least one row extending along this extension direction "B".
  • the nozzles 4 are arranged on at least one first 6a and a second row 6b arranged side by side.
  • the nozzles 4 are arranged on a plurality of first 6a and second rows 6b arranged side by side and alternate each other.
  • the nozzles 4 of the first row 6a are offset relative to the nozzles of the second row 6b.
  • each device 1 or head
  • the resolution of the printing of each device 1 is increased until also 14.5 dpi.
  • the device comprises a plurality of delivery valves 7, each of which associated with one of the nozzles 4.
  • valves 7 are solenoid valves 8, 80.
  • each solenoid valve 8 extends between an outlet mouth 8a or delivery mouth, located at the nozzle 4, and an inlet mouth 8b, placed in fluid connection with, i.e. associated with, an enamel tank 9.
  • each delivery solenoid valve 8 includes a tubular body 10, a shutter 20 movable inside the tubular body 10, and an activation coil 1 1 or solenoid.
  • the solenoid valve 8 has an operating frequency between 1000 and 1500 Hz, preferably about 1200 Hz.
  • the solenoid valve 8 in particular at least the parts in contact with the enamel, are made from one or more of the following materials:
  • the tubular body 10 extends within the containment body 2 starting from the outlet mouth 8a, placed at the operating face 3 away therefrom.
  • Fastening means 19 are also provided, which are housed within the containment body 2 and acting to fixedly constrain the solenoid valves 8 to the operating face 3.
  • the fastening means 19 are preferably defined by a drilled plate 19a anchored to the containment body 2 and provided with a plurality of apertures, each traversed by a tubular body 10.
  • the solenoid valves 8 extend starting from the base 5a of the boxlike body 5 within the containment volume "V".
  • the tubular bodies 10 are arranged in array and extend parallel to each other within such a containment volume "V".
  • the coil 1 1 is arranged around the respective tubular body, preferably at an intermediate zone between the enamel inlet mouth 8b and the enamel outlet mouth 8a.
  • the outlet mouth 8a of the solenoid valve 8 is in collaboration with the respective hole of the base 5a, a nozzle 4.
  • the outlet mouth 8a has a diameter between 0.1 and 1 mm, preferably between 0.2 and 0.6 mm.
  • the device 1 of the invention is possible to dispense high volume enamels and obtain novel quality products.
  • the device 1 is configured so that the enamel tank 9, 90 is housed within the containment body 2.
  • the device comprises the tank 9, 90 that is integrated therein.
  • the tank 9, 90 of the single device is placed in fluid connection with the valves 7 (in particular with the solenoid valves 8, 80) and with an enamel primary vessel.
  • the tank 9, 90 has at least a first 9a, 9b, and a second aperture 90a, 90b, designed to enable a continuous inlet and outlet flow from the enamel tank 9, 90.
  • these openings 9a, 9b, 90a, 90b are placed in connection with the pumping circuit, i.e. the vessel, associated to the printing machine 100.
  • each device comprises a respective enamel storage tank 9, from which the valve 7 (or solenoid valves 8) directly draws being traversed by the enamel.
  • the tank 9 is positioned at a zone of the containment body 2 distally from the operating face 3.
  • the tank 9 is located at the input mouths 8b of the tubular bodies 10 in order to provide them with enamel.
  • the solenoid valves 8 are placed so that at least the respective input mouths 8b are embedded (and at least in fluid connection) with the tank 9.
  • the tank 9 is spaced from the operating face 3 (i.e. the base 5a) to define a free space for accommodating a part of the solenoid valves 8, and in particular for accommodating the coils 1 1 .
  • the tank 90 is at least partially bounded by the operating face 3.
  • the tank is adjacent to the operating face 3 and has itself the plurality of nozzles 4.
  • the solenoid valves are not traversed by the enamel, but have a shutter 81 having a first portion 81 a embedded in the tank 90.
  • a first portion 81 a is associated with a respective nozzle 4 and movable towards and away therefrom between a locking position, in which it occludes the nozzle 4, and a releasing position, in which it allows the delivery of enamel.
  • valves are not traversed by the enamel, avoiding any problems of clogging.
  • the device 1 comprises a further air tank 91 .
  • Such further tank 91 is placed in fluid connection with a second portion 81 b of the shutter 81 facing the first 91 a.
  • such additional tank 91 is associable (i.e. associated during use) with a pressurized pneumatic circuit.
  • control unit 107 of the machine 100 is adapted to detect the pressure within the tank 90 and within the further tank 91 by special sensors.
  • the pressure in the enamel recirculation circuit and in the pressurized pneumatic circuit could be detected.
  • the control unit 107 is configured to control at least said pressurized pneumatic circuit to maintain the pressure within the further tank 91 substantially equivalent to the pressure within the tank 90 in order to reduce the stress on the solenoid valves 80.
  • the stiffness of the elastic member associated with the shutter is minimized and, consequently, the energy required by the solenoid 1 1 to move the shutter from the locking to the releasing position (the solenoid valve 80 is "normally closed") is minimized.
  • the further tank 91 is positioned at a zone of the containment body 2 distally from the operating face 3.
  • the second embodiment described herein is structurally analogous to the first one with the addition of the enamel tank 90 below the solenoid valves 80.
  • the tank 90 of the first embodiment corresponds structurally to the further tank 91 of the second one.
  • both the embodiments have at least one tank 9, 91 (for enamel or air) placed in fluid connection with the solenoid valves 8, 80 so that the same draw either enamel or air.
  • the containment body 2 i.e. the box-like body 5
  • the containment body 2 comprises a first 5a and a second base 5c facing each other and a plurality of side walls 5b, in which the first base 5a includes the operating face 3.
  • At least one intermediate septum 12 is provided, which is interposed between the first 5a and said second base 5c.
  • Such intermediate septum 12 delimits, in collaboration with the second base 5c (and part of the side walls 5b), the tank 9 or the further tank 91 .
  • the device 1 comprises a temperature sensor 21 associated with the tank 9.
  • Such sensor is configured to send to the control unit 107 a signal representative of the temperature of the enamel in the tank.
  • the control unit 107 is configured to determine a change in temperature of the enamel in the primary vessel as a function of a comparison between such signal and a reference signal.
  • the machine 100 comprises the presence of heating means (e.g. a resistance) associated to the primary vessel to change its temperature.
  • heating means e.g. a resistance
  • the solenoid valves 8 are received at least partially.
  • a temperature detector 22 associated with that compartment (between the first base 5a and the intermediate septum 12) for measuring its temperature.
  • Such detector is configured to send to the control unit 107 a signal representative of the temperature of the coils 1 1 in the compartment.
  • the control unit 107 is configured to determine a temperature shift in such a compartment for a comparison between such signal and a reference signal.
  • the machine 100 comprises the presence of cooling means (e.g. blowing nozzles) associated with the compartment (i.e., preferably placed between the first base 5a and the intermediate septum 12 vessel primary, in order to change the respective temperature.
  • cooling means e.g. blowing nozzles
  • the compartment i.e., preferably placed between the first base 5a and the intermediate septum 12 vessel primary, in order to change the respective temperature.
  • the intermediate septum 12 has a plurality of through holes 12a, each traversed by one end of a solenoid valve 8, 80 to allow the draft of the enamel in the tank 9 or of the air from the further tank 91 by the respective inlet mouth.
  • the intermediate septum 12 has a plurality of holes 12a each aligned and facing to a corresponding hole of the first base 5a, i.e. to each nozzle 4.
  • each hole 12a is provided with its own seal 13. More precisely, the seal 13 is defined by an annular seal interposed between a hole edge 12a and the end of the solenoid valve 8 (i.e. the tubular body 10).
  • the device 1 comprises a card 14 for driving the valve 7 (i.e. the solenoid valves 8), which is also placed within the containment body 2. More precisely, the card 14 is associated to the coil 1 1 or solenoid of each solenoid valve 8 in order to excite it; preferably, the driving of the coil 1 1 is executed by the card 14 according to a received signal from the control unit 107 of the machine 100.
  • the valve 7 i.e. the solenoid valves 8
  • the card 14 is associated to the coil 1 1 or solenoid of each solenoid valve 8 in order to excite it; preferably, the driving of the coil 1 1 is executed by the card 14 according to a received signal from the control unit 107 of the machine 100.
  • the driving card 14 is housed in the containment body 2 and interposed between the tank 9 (or the further tank 91 ) and the operating face 3 (i.e., the first base 5a).
  • the solenoid valves 8 extend (between the tank 9, 91 and the operating face 3) crossing the driving card 14.
  • the driving card 14 comprises a plurality of holes 14a each traversed by a portion of a solenoid valve 8.
  • the holes 14a of the card 14 are each aligned and facing to a corresponding hole of the first base 5a, i.e. to each nozzle 4.
  • the holes 14a of the card 14 are each aligned and facing to a corresponding hole of the intermediate septum 12.
  • the card 14 is not self-powered.
  • a power and/or driving cable 15 is provided, extending from the card 14 and linked or linkable to the control unit 107 of the machine 100.
  • the power and/or driving cable 15 departs therefrom crossing the tank 9 or the further tank 91 .
  • the power and/or driving cable 15 is of the flat type with seizure connector.
  • the tank comprises a central channel 9c traversed by said cable 15. More precisely, the tank 9, 91 extends annularly around its own central channel 9c, 91 c, through which the power and/or driving cable 15 passes. In order to ensure the seal, such a central canal 9c, 91 c is also provided with its own seal 18, which prevents leakage both between the tank and the volume "V" and outwardly.
  • both the second base 5b and the intermediate septum 12 are provided with respective through slots 16, 17, through which the cable 15 runs, so that it can be connected to the control unit 107.
  • Such through slots define the inlet and outlet ports of the central channel 9c through which the cable 15 passes.
  • the invention achieves the intended aim and achieves important advantages.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)

Abstract

A printing device for ceramic tiles or slabs, comprises a containment body (2) having at least one operating face (3) provided with a plurality of printing nozzles (4) and a plurality of solenoid valves (8) for the delivery of enamel, each solenoid valve being associated with an enamel tank (9) and with a printing nozzle (4).

Description

DESCRIPTION
PRINTING DEVICE AND MACHINE FOR PRINTING CERAMIC TILES
OR SLABS
The present invention relates to a device (or printhead) and a printing machine for ceramic tiles or slabs, particularly for the screen printing or imprinting by using high volume enamels on ceramic plate-like objects. Therefore, the present invention finds particular application in ceramic manufacturing industry, and particularly in enamelling and staining (screen for example) of tiles or the like.
In the prior art many solutions of printing devices for tiles are known, all or almost all of which are dedicated to delivery of low volume enamels, i.e. enamels containing particles with limited dimensions.
In light of the above considerations, in the prior art printing heads are utilized in which each printing device consists of a number of piezoelectric valves arranged in succession, each defining a varnish delivery nozzle. In particular, each valve involves the use of a deformable crystal that, once excited with variable voltage as a function of a driving signal, allows for the passage of a predetermined amount of enamel.
An example of such a solution is known from the device Xaar 001 , from the company Xaar®, which precisely has a box-like body having one operating face from which a plurality of nozzles are faced and arranged in succession on a row.
Such nozzles are all defined by piezoelectric actuators, each associated with a separate enamel tank.
Disadvantageously, as already mentioned above, such a device is usable for only the ejection and distribution of enamels with low/mid volume, in which the particles have dimensions (i.e. diameter) much lower to a hundredth of a millimetre (in the order of microns or of tens of micron).
This is thus greatly limiting for the manufacturer, which is in need to choose the products within a narrow range of solutions, leading to the creation of solutions increasingly uniform between each other. Object of the present invention is to provide a printing device and machine for ceramic tiles or slabs that overcome the drawbacks of the prior art mentioned above.
In particular, object of the present invention is to provide a printing device and machine for ceramic tiles or slabs, which allow the delivery of high volume enamels.
More precisely, object of the present invention is to provide a printing device for ceramic tiles or slabs structurally simple and easy to be maintained or replaced.
Said objects are achieved by a printing device having the features of one or more of claims 1 to 18, a well as a printing machine having the features of claims 19 or 22.
In particular, the intended objects are achieved by a printing device for ceramic tiles or slabs comprising a containment body having at least one operating face provided with a plurality of printing nozzles and a plurality of solenoid valves for the delivery of enamel, each solenoid valve being associated with an enamel tank and a printing nozzle.
Preferably, the valves are solenoid valves.
In a first embodiment, the delivery solenoid valves are each associated with a printing nozzle and extend between an outlet mouth, located at the nozzle, and an inlet mouth, associated with an enamel tank.
In particular, the delivery solenoid valves each comprise a tubular body, a shutter movable inside the tubular body, and an activation/driving coil or solenoid.
The tubular body develops within the containment body from the outlet mouth, located at the operating face, away therefrom.
Alternately, the solenoid valves have a shutter having a first portion embedded into said tank, associated with a respective nozzle and movable towards and away therefrom between a locking position, in which it occludes the nozzle, and a releasing position, in which it allows the delivery of enamel. Advantageously, the presence of solenoid valves in place of piezoelectric valves allows to increase the volume of enamel to be treated and delivered, allowing the printing and screen printing even with high volume enamels, e.g. containing pigments with particle size greater than 10 μιη, particularly comprised between 10 and 30 μιη.
Preferably, further, the enamel tank is housed in the containment body. Even more preferably, the printing device comprises a card for driving the solenoid valves placed within the containment body and associated to the coil or solenoid of each solenoid valve.
Advantageously, in this way, the printing device is substantially self- sufficient, i.e. stand-alone, requiring simply a link to enamel pumping circuit to be operative.
In light of the above considerations, the printing machine according to the present invention comprises a frame comprising at least a plane, a rod extending along its own main direction and facing to said plane, movement means for the bar along a direction transverse to said main direction, and a plurality of printing devices according to the present invention connected to the bar and arranged in succession along said main direction.
Advantageously, such devices are removable and releasable from the bar without having to remove or dismount other components, thus making very easy the maintenance of the system.
These and other advantages will become more apparent from the following exemplary, and therefore non-limiting description of a preferred, and therefore not exclusive embodiment of a printing device and machine for ceramic tiles or slabs, as shown in the following drawing figures, in which:
- Figure 1 shows an exploded perspective view of a first embodiment of a printing device for ceramic tiles or slabs according to the present invention;
- Figure 2 shows a cross-sectional view of the device of Figure 1 ; - Figure 3 shows a cross-sectional view of an alternative embodiment of a printing device for ceramic tiles or slabs according to the present invention;
- Figure 4 shows a bottom view of the device of Figure 1 or 3, in an assembled condition;
- Figure 5 shows a plan view of a printing machine for ceramic tiles or slabs according to the present invention.
With reference to the appended figures, number 1 indicates a printing device (or printhead) for ceramic tiles or slabs according to the present invention.
The printing device 1 (or printhead) is thus preferably used within a more complete printing machine 100 for ceramic tiles or slabs in general.
The machine 100 (and thus the device 1 ) is therefore used for printing, staining and enamelling of ceramic plate-like elements, as tiles, by using special enamels.
For example, the performable processes are screen printing type processes or the creation of "structures".
The enamels usable for printing by the device 1 according to the present invention are water-based enamels both at low and high volume.
Note that, by the term "high volume" is meant define those enamels containing particles of considerable size, generally higher than a tenth of a millimetre, which normally are not processable and dispensable by known printing devices, such as the piezoelectric devices.
In particular, with high volume enamels is meant define those enamels having a particle size (of the pigments) greater than 10 μιη, preferably between 10 and 30 μιη.
The printing machine 100 thus comprises a frame 101 comprising at least a plane 101 a on which the ceramic tiles or slabs are laid, with the face to be processed (i.e. to be stained) facing away from the plane 101 a.
To such frame 101 a printing bar 103 is associated, which is adapted to realize the staining. The bar 103 extends along its own main direction "A" and facing to said plane 101 a.
Therefore, the bar 103 is made as a portal above the plane 101 a facing hereto.
To the bar 103 movement means 104 are also associated, which are configured to move it along a direction transverse to said main direction "A".
According to one aspect of the present invention, the machine 100 is provided with a plurality of printing devices 1 connected to the bar 103 and arranged in succession along the main direction "A".
Note that the machine 100 also includes an enamel-pumping circuit (not shown), connected to an enamel primary vessel and provided with one or more recirculation pumps.
A control unit 107 is connected to the pump and devices for activating them according to a drawing or the preset degree of colouration.
In preferred embodiment, the pumping circuit operates at a pressure comprised between 1 and 10 bar, preferably about 3 bar.
Preferably, the printing devices 1 are arranged in succession to each other on at least a first 105 and a second row 106 arranged side by side.
In order to increase the resolution, the devices 1 of the first row 105 are offset relative to the devices of the second row 106.
Advantageously, thus, along the extension direction "A" of the rows, between two successive devices 1 of the first row 1 05 a device of the second row 106 is interposed, and vice versa.
That is, the resolution of the printing is increased until also 58 or 60 dpi.
In more detail of the device or head 1 , i.e., the main object of the present invention, it comprises a containment body 2 having at least one operating face 3 provided with a plurality of printing nozzles 4.
The containment body 2 is thus preferably defined by a box-like body 5 having at least one base 5a (or first base) and a side enclosure 5b delimiting a containment volume "V". In preferred embodiment, the side enclosure 5b comprises a plurality of side walls angled to each other to define a polygonal perimeter of the containment body 2.
The base 5a defines the operating face 3 and is thus provided with a plurality of holes defining the printing nozzles 4.
Preferably, the nozzles 4 are arranged in succession along a predetermined extension direction "B".
Therefore, the nozzles 4, and thus the holes formed in the base 5a, are aligned along at least one row extending along this extension direction "B". Preferably, however, the nozzles 4 are arranged on at least one first 6a and a second row 6b arranged side by side.
More preferably, in the operating face 3 the nozzles 4 are arranged on a plurality of first 6a and second rows 6b arranged side by side and alternate each other.
Preferably, the nozzles 4 of the first row 6a are offset relative to the nozzles of the second row 6b.
Advantageously, thus, along the extension direction "B" of the rows 6a, 6b, between two successive nozzles 4 of the first row 6a a nozzle of the second row 6b is interposed, and vice versa.
That is, the resolution of the printing of each device 1 (or head) is increased until also 14.5 dpi.
Note that, to allow the delivery of enamel from the nozzles 4, the device comprises a plurality of delivery valves 7, each of which associated with one of the nozzles 4.
According to one of the aspects of the invention, the valves 7 are solenoid valves 8, 80.
In a first embodiment (Figures 1 , 2), each solenoid valve 8 extends between an outlet mouth 8a or delivery mouth, located at the nozzle 4, and an inlet mouth 8b, placed in fluid connection with, i.e. associated with, an enamel tank 9. Preferably, each delivery solenoid valve 8 includes a tubular body 10, a shutter 20 movable inside the tubular body 10, and an activation coil 1 1 or solenoid.
Preferably, the solenoid valve 8 has an operating frequency between 1000 and 1500 Hz, preferably about 1200 Hz.
The solenoid valve 8, in particular at least the parts in contact with the enamel, are made from one or more of the following materials:
- sapphire;
- ruby;
- stainless steel;
- peek;
- pps;
- epoxy;
- tungsten carbide.
The tubular body 10 extends within the containment body 2 starting from the outlet mouth 8a, placed at the operating face 3 away therefrom.
Fastening means 19 are also provided, which are housed within the containment body 2 and acting to fixedly constrain the solenoid valves 8 to the operating face 3.
The fastening means 19 are preferably defined by a drilled plate 19a anchored to the containment body 2 and provided with a plurality of apertures, each traversed by a tubular body 10.
That is, the solenoid valves 8 extend starting from the base 5a of the boxlike body 5 within the containment volume "V".
Preferably, the tubular bodies 10 are arranged in array and extend parallel to each other within such a containment volume "V".
The coil 1 1 is arranged around the respective tubular body, preferably at an intermediate zone between the enamel inlet mouth 8b and the enamel outlet mouth 8a.
Therefore, the outlet mouth 8a of the solenoid valve 8 is in collaboration with the respective hole of the base 5a, a nozzle 4. Preferably, the outlet mouth 8a has a diameter between 0.1 and 1 mm, preferably between 0.2 and 0.6 mm.
Advantageously, by using the device 1 of the invention is possible to dispense high volume enamels and obtain novel quality products.
Preferably, the device 1 is configured so that the enamel tank 9, 90 is housed within the containment body 2.
Therefore, the device comprises the tank 9, 90 that is integrated therein. Note that the tank 9, 90 of the single device is placed in fluid connection with the valves 7 (in particular with the solenoid valves 8, 80) and with an enamel primary vessel.
The tank 9, 90 has at least a first 9a, 9b, and a second aperture 90a, 90b, designed to enable a continuous inlet and outlet flow from the enamel tank 9, 90.
More precisely, these openings 9a, 9b, 90a, 90b are placed in connection with the pumping circuit, i.e. the vessel, associated to the printing machine 100.
Advantageously, in this way a continuous movement of the enamel is ensured, that avoids the sedimentation or fouling due to solid particles settling in the tank 9, 90 and/or the valves 8.
In said first embodiment (Figure 1 , 2), each device comprises a respective enamel storage tank 9, from which the valve 7 (or solenoid valves 8) directly draws being traversed by the enamel.
Preferably, in this embodiment, the tank 9 is positioned at a zone of the containment body 2 distally from the operating face 3.
More precisely, the tank 9 is located at the input mouths 8b of the tubular bodies 10 in order to provide them with enamel.
That is, the solenoid valves 8 are placed so that at least the respective input mouths 8b are embedded (and at least in fluid connection) with the tank 9. In the embodiment illustrated, the tank 9 is spaced from the operating face 3 (i.e. the base 5a) to define a free space for accommodating a part of the solenoid valves 8, and in particular for accommodating the coils 1 1 .
Alternately, with particular reference to Figure 3, the tank 90 is at least partially bounded by the operating face 3.
Therefore, in this embodiment the tank is adjacent to the operating face 3 and has itself the plurality of nozzles 4.
In this embodiment, the solenoid valves are not traversed by the enamel, but have a shutter 81 having a first portion 81 a embedded in the tank 90. Such a first portion 81 a is associated with a respective nozzle 4 and movable towards and away therefrom between a locking position, in which it occludes the nozzle 4, and a releasing position, in which it allows the delivery of enamel.
Advantageously, thereby the valves are not traversed by the enamel, avoiding any problems of clogging.
Note that, preferably, in this embodiment, the device 1 comprises a further air tank 91 .
Such further tank 91 is placed in fluid connection with a second portion 81 b of the shutter 81 facing the first 91 a.
Preferably, such additional tank 91 is associable (i.e. associated during use) with a pressurized pneumatic circuit.
Advantageously, in this way, it is possible to counteract the pressure exerted by the enamel on the first portion 81 a of the shutter 81 , so that the control of the solenoid valve 80 is less critical.
More precisely, the control unit 107 of the machine 100 is adapted to detect the pressure within the tank 90 and within the further tank 91 by special sensors.
Alternately, the pressure in the enamel recirculation circuit and in the pressurized pneumatic circuit could be detected.
The control unit 107 is configured to control at least said pressurized pneumatic circuit to maintain the pressure within the further tank 91 substantially equivalent to the pressure within the tank 90 in order to reduce the stress on the solenoid valves 80.
Advantageously, thereby the stiffness of the elastic member associated with the shutter is minimized and, consequently, the energy required by the solenoid 1 1 to move the shutter from the locking to the releasing position (the solenoid valve 80 is "normally closed") is minimized.
Note that the further tank 91 is positioned at a zone of the containment body 2 distally from the operating face 3.
Therefore, the second embodiment described herein is structurally analogous to the first one with the addition of the enamel tank 90 below the solenoid valves 80.
Therefore, the tank 90 of the first embodiment corresponds structurally to the further tank 91 of the second one.
Thus, both the embodiments have at least one tank 9, 91 (for enamel or air) placed in fluid connection with the solenoid valves 8, 80 so that the same draw either enamel or air.
In view of the above, preferably the containment body 2, i.e. the box-like body 5, has a further base 5c facing the base 5a and therefrom spaced. Therefore, the containment body 2 comprises a first 5a and a second base 5c facing each other and a plurality of side walls 5b, in which the first base 5a includes the operating face 3.
Further, at least one intermediate septum 12 is provided, which is interposed between the first 5a and said second base 5c.
Such intermediate septum 12 delimits, in collaboration with the second base 5c (and part of the side walls 5b), the tank 9 or the further tank 91 . Preferably, the device 1 comprises a temperature sensor 21 associated with the tank 9.
Such sensor is configured to send to the control unit 107 a signal representative of the temperature of the enamel in the tank. The control unit 107 is configured to determine a change in temperature of the enamel in the primary vessel as a function of a comparison between such signal and a reference signal.
In this respect, the machine 100 comprises the presence of heating means (e.g. a resistance) associated to the primary vessel to change its temperature.
Thus, between the first base 5a and the intermediate septum 12 the solenoid valves 8, and preferably at least the coils 1 1 , are received at least partially.
In preferred embodiment, it is additionally contemplated a temperature detector 22 associated with that compartment (between the first base 5a and the intermediate septum 12) for measuring its temperature.
Such detector is configured to send to the control unit 107 a signal representative of the temperature of the coils 1 1 in the compartment.
The control unit 107 is configured to determine a temperature shift in such a compartment for a comparison between such signal and a reference signal.
In this respect,, the machine 100 comprises the presence of cooling means (e.g. blowing nozzles) associated with the compartment (i.e., preferably placed between the first base 5a and the intermediate septum 12 vessel primary, in order to change the respective temperature.
Instead, between the intermediate septum 12 and the second base 5c there is the tank 9 or the further tank 91 .
Therefore, the intermediate septum 12 has a plurality of through holes 12a, each traversed by one end of a solenoid valve 8, 80 to allow the draft of the enamel in the tank 9 or of the air from the further tank 91 by the respective inlet mouth.
That is, the intermediate septum 12 has a plurality of holes 12a each aligned and facing to a corresponding hole of the first base 5a, i.e. to each nozzle 4.
In order to avoid leakages, each hole 12a is provided with its own seal 13. More precisely, the seal 13 is defined by an annular seal interposed between a hole edge 12a and the end of the solenoid valve 8 (i.e. the tubular body 10).
Preferably, the device 1 comprises a card 14 for driving the valve 7 (i.e. the solenoid valves 8), which is also placed within the containment body 2. More precisely, the card 14 is associated to the coil 1 1 or solenoid of each solenoid valve 8 in order to excite it; preferably, the driving of the coil 1 1 is executed by the card 14 according to a received signal from the control unit 107 of the machine 100.
Preferably, the driving card 14 is housed in the containment body 2 and interposed between the tank 9 (or the further tank 91 ) and the operating face 3 (i.e., the first base 5a).
Therefore, the solenoid valves 8 extend (between the tank 9, 91 and the operating face 3) crossing the driving card 14.
In order to facilitate such placement in the containment body 2, the driving card 14 comprises a plurality of holes 14a each traversed by a portion of a solenoid valve 8.
Therefore, the holes 14a of the card 14 are each aligned and facing to a corresponding hole of the first base 5a, i.e. to each nozzle 4.
Thus, the holes 14a of the card 14 are each aligned and facing to a corresponding hole of the intermediate septum 12.
In the embodiment illustrated, the card 14 is not self-powered.
Therefore, a power and/or driving cable 15 is provided, extending from the card 14 and linked or linkable to the control unit 107 of the machine 100. Preferably, the power and/or driving cable 15 departs therefrom crossing the tank 9 or the further tank 91 .
In preferred embodiment, the power and/or driving cable 15 is of the flat type with seizure connector.
In this respect, the tank comprises a central channel 9c traversed by said cable 15. More precisely, the tank 9, 91 extends annularly around its own central channel 9c, 91 c, through which the power and/or driving cable 15 passes. In order to ensure the seal, such a central canal 9c, 91 c is also provided with its own seal 18, which prevents leakage both between the tank and the volume "V" and outwardly.
Note that both the second base 5b and the intermediate septum 12 are provided with respective through slots 16, 17, through which the cable 15 runs, so that it can be connected to the control unit 107.
Such through slots define the inlet and outlet ports of the central channel 9c through which the cable 15 passes.
The invention achieves the intended aim and achieves important advantages.
Indeed, by using of the printing device of the invention, it is possible to manufacture ceramic tiles or slabs, which are partially or fully coated on their visible face in use with a high volume enamel, i.e. an enamel comprising solid particles with a size, i.e., a diameter greater than 10 μιη.
Such products, being new products with respect to the prior art, can be also considered subject matter of the present invention.
However, the presence of printing devices in which distribution (or delivery) valves, tank and control card are integrated, allows to considerably simplifying the manufacturing, the assembling and the maintenance of the printhead.

Claims

Claims
1 Printing device for ceramic tiles or slabs, characterized by comprising:
- a containment body (2) having at least one operating face (3) provided with a plurality of printing nozzles (4);
- a plurality of solenoid valves (8, 80) for the delivery of enamel, each solenoid valve being associated with a enamel tank (9, 90) and a printing nozzle (4).
2 Printing device according to claim 1 , characterized in that said delivery solenoid valves (8, 80) each comprise a tubular body (10), a shutter movable inside the tubular body (10) and a coil (1 1 ) or solenoid; said tubular body (10) extending within the containment body (2) from a printing nozzle (4), located at the operating face (3) away therefrom.
3 Printing device according to claim 1 or 2, characterized in that each printing nozzle (4) has a diameter between 0.1 and 1 mm, preferably between 0.2 and 0.6 mm.
4 Printing device according to any one of the preceding claims, characterized in that said nozzles (4) are arranged in succession to one another on at least a first (6a) and a second rows (6b) arranged side by side, in which the nozzles (4) of the first row (6a) are offset with respect to the nozzles of the second row (6b) so that, along an extending direction (A) of the rows (6a, 6b), between two subsequent nozzles (4) of the first row (6a) a nozzle of the second row (6b) is interposed.
5 Printing device according to any one of the preceding claims, characterized in that said enamel tank (9, 90) is housed in said containment body (2).
6 Printing device according to claim 5, characterized in that said tank (9, 90) has at least a first (9a, 90a) and a second openings (9b, 90b) designed to enable a continuous inlet and outlet flow from the enamel tank (9, 90).
7 Printing device according to claim 5 or 6, characterized in that said tank
(9) is locate at a zone of the containment body (2) distally from the operating face (3); said solenoid valves (8) extending between an outlet mouth (8a), located at a nozzle (4), and an inlet mouth (8b), associated to the tank (9) to draw the enamel from the enamel tank (9) and deliver it through the nozzle (4) from the outlet mouth (8a).
8 Printing device according to claim 5 or 6, characterized in that said tank (90) is at least partially bounded by said operating face (3); said solenoid valves (80) having a shutter (81 ) having a first portion (81 a) embedded in said tank (90), associated with a respective nozzle (4) and movable towards and away therefrom between a locking position, in which it occludes the nozzle (4), and a releasing position, in which it allows the delivery of enamel.
9 Printing device according to claim 8, characterized in that said shutter (81 ) of the solenoid valves (80) comprises a second portion (81 b) facing the first (81 a); said device comprising a further air tank (91 ) placed in fluid connection with said second portion (81 b) and connectable to a pressurized pneumatic circuit.
10 Printing device according to claim 9, characterized in that said further tank (91 ) is positioned at a zone of the containment body (2) distally from the operating face (3)
1 1 Printing device according to any one of claims 5 to 10, characterized in that said containment body (2) has at least a first (5a) and a second bases (5c) opposite each other, and a plurality of side walls (5b), wherein said operating face (3) is defined by said first base (5a); said device (1 ) further comprising at least one intermediate septum (12) interposed between said first (5a) and said second bases (5b) and delimiting the tank (9) or the further tank (91 ), in cooperation with the second base (5b).
12 Printing device according to claim 1 1 , characterized in that said intermediate septum (12) has a plurality of holes (12a) each traversed by one end of a solenoid valve (8, 80) and each having an own seal (13). 13 Printing device according to any one of the preceding claims, characterized in that it comprises a card (14) for driving the solenoid valves (81 , 80) placed inside said containment body (2) and associated to the coil (1 1 ) or solenoid of each solenoid valve (8, 80).
14 Printing device according to claim 1 1 , characterized in that said driving card (14) comprises a plurality of holes (14a) each traversed by one end of a solenoid valve (8, 80).
15 Printing device according to claim 13 or 14, characterized in that said driving card (14) is housed in the containment body (2) and interposed between the tank (9), or the further tank (91 ), and said operating face (3); said solenoid valves (8, 80) extending between the tank (9), or the further tank (91 ), and the operating face (3) crossing the driving card (14).
16 Printing device according to claim 15, characterized in that the driving card (14) has at least one power/driving cable (15) extending away and crossing the tank (9) and/or the further tank (91 ).
17 Printing device according to claim 16, characterized in that said tank (9) and/or said further tank (91 ) extends annularly around its own central channel (9c) through which said power/driving cable (15) passes.
18 Printing device according to any one of the preceding claims, characterized in that it comprises fastening means (17) housed within the containment body (2) and acting to fixedly constrain the solenoid valves (8) to the operating face (3).
19 Printing machine for the enamelling of ceramic tiles or slabs, comprising:
- a frame (101 ) comprising at least a plane (101 a);
- a bar (103) extending along its own main direction (A) and facing to said plane (101 );
- a plurality (1 ) of printing devices according to any one of the preceding claims connected to said bar (103) arranged in succession along said main direction (A);
- movement means (104) of said bar (103) along a direction transverse to said main direction (A).
20 Printing machine according to claim 19, characterized in that said printing devices (1 ) are arranged in succession to one another on at least a first (105) and a second rows (106) arranged side by side, in which the devices (1 ) of the first row (105) are offset with respect to the devices of the second row (106) so that, along an extending direction (B) of the rows (105, 106), between two subsequent devices (1 ) of the first row (105) a device (1 ) of the second row (106) is interposed.
21 Printing machine according to claim 19 or 20, characterized in that each printing device (1 ) comprises said enamel tank (90) and said further air tank (91 ) connected to a movement hydraulic circuit and to a pressurized pneumatic circuit, respectively.
22 Printing machine according to claim 20, characterized in that it comprises a control unit (107) adapted to detect the pressure within the tank (90) and the further tank (91 ), and configured to control at least said pressurized pneumatic circuit to maintain within the further tank (91 ) a pressure substantially equivalent to the pressure within the tank (90) in order to reduce the stress on the solenoid valves (80)
PCT/IB2015/060005 2015-02-27 2015-12-28 Printing device and machine for printing ceramic tiles or slabs WO2016135545A1 (en)

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ITMI20150303 2015-02-27
ITMI2015A000303 2015-02-27
ITMI2015A000561 2015-04-17
ITMI20150561 2015-04-17

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IT201700019466A1 (en) * 2017-02-21 2018-08-21 Tecno Italia S R L DEVICE AND METHOD FOR THE DECORATION OF MANUFACTURED ARTICLES BY DIGITAL PRINTING
CN108943348A (en) * 2018-08-20 2018-12-07 佛山市赛普飞特机械有限公司 A kind of digital printing device using ceramic powder
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EP4227051A4 (en) * 2021-11-30 2024-08-14 Foshan Hope Digital Printing Equipment Co Ltd Ceramic digital glaze spraying device
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IT201600131820A1 (en) * 2016-12-28 2018-06-28 Cementhai Ceram Co Ltd DEVICE AND PRINTING MACHINE FOR CONSTRUCTION MATERIALS
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WO2024165965A1 (en) * 2023-02-09 2024-08-15 Dolcini Antonella Device for glazing objects such as ceramic slabs and tiles

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