EP2842753B1 - Têtes d'impression pour décorer des substrats céramiques - Google Patents

Têtes d'impression pour décorer des substrats céramiques Download PDF

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Publication number
EP2842753B1
EP2842753B1 EP13425119.8A EP13425119A EP2842753B1 EP 2842753 B1 EP2842753 B1 EP 2842753B1 EP 13425119 A EP13425119 A EP 13425119A EP 2842753 B1 EP2842753 B1 EP 2842753B1
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EP
European Patent Office
Prior art keywords
chamber
nozzle
printhead
actuator
glaze
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13425119.8A
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German (de)
English (en)
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EP2842753A1 (fr
Inventor
Gian Mario Guidotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
In Te Sa SpA
Intesa SpA
Original Assignee
In Te Sa SpA
Intesa SpA
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Publication date
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Priority to ES13425119T priority Critical patent/ES2861950T3/es
Priority to EP13425119.8A priority patent/EP2842753B1/fr
Publication of EP2842753A1 publication Critical patent/EP2842753A1/fr
Application granted granted Critical
Publication of EP2842753B1 publication Critical patent/EP2842753B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters 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
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/05—Heads having a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Definitions

  • the present invention relates to ink jet printheads and, particularly, but not exclusively, it relates to improvements to printheads for decorating ceramic substrates.
  • the glaze generally comprises an aqueous or solvent based ceramic solution or suspension, or a suspension within a solution, made up of a liquid part having a quantity of mineral particulates/powders dispersed therein, whereby the specific glaze formulation is dependent on the requirements of the end user.
  • EP1972450B discloses an example of a conventional printhead 1 used to print glaze as shown in section in Figure 1 .
  • the printhead 1 comprises a fluid chamber 2, having a fluid inlet (not shown) and fluid outlet (not shown), whereby the glaze 4 flows through the chamber 2 from the input to the output under a pressure of e.g. 1 Bar.
  • the printhead 1 comprises an actuator 6 in the form of a piezoelectric bar having an obturator 7 coupled thereto and located inside the chamber 2, whilst the printhead 1 further comprises a nozzle portion 8 having a surface 5 inside the chamber 2 and having at least one through-hole nozzle 9 therein providing a flow pathway from inside the chamber 2 to a substrate 10 through the nozzle 9.
  • the obturator 7 As the obturator 7 is coupled to the actuator 6, it moves in the same direction of deflection of the actuator 6, and is configured to engage with the surface 5 to block the nozzle 9 when the actuator 6 is in a non-deflected position, and to disengage from the surface 5 thereby uncovering the nozzle 9, when the actuator is in a deflected position.
  • Document EP0993951 discloses a solution for separating the actuating element from the ink fluid.
  • the solution relates to a printhead having a specific obturator which is different from the obturator of the printhead according to the present invention.
  • a further problem with conventional printheads is that they are generally only compatible with solvent based glazes, which are costly, and can be highly toxic, and require a furnace to burn the solvent after deposition.
  • solvent based glazes which are costly, and can be highly toxic, and require a furnace to burn the solvent after deposition.
  • using water based glazes in conventional printheads results in clogged nozzles, and increased wear on the internal components within the printhead.
  • the actuator element is mechanically coupled to the obturator, wherein the fluid chamber comprises at least one nozzle, and wherein the obturator is operable to close or open the inlet of the at least one nozzle on actuation of the actuator element.
  • the obturator is part of an obturator assembly.
  • Figure 2a shows, in section, a printhead 20, whereby glaze is prevented from flowing through a nozzle 29 in a nozzle portion 28, whilst Figure 2b shows in section the printhead 20 whereby glaze is not prevented from flowing through the nozzle 29.
  • any suitable fluid could be used depending on the specific application e.g. methyl ethyl ketone or acetone based ink for printing on cardboard/paper/food packaging or polymer/metallic based ink for 3D-printing, or engobe.
  • the glaze itself may contain pigment to provide colour after firing, and have other additives such as clay to provide different finishes such as glossy, matt, opaque finishes that may be combined on the same surface, as well as special effects such as metallic tones and lustre. Texture or relief structures can be provided by printing a solution containing predominantly engobe.
  • An exemplary digital glaze composition is disclosed in ES2386267 . Particle sizes within the glaze are generally in the range of between 0.1 ⁇ m - 50 ⁇ m, and preferably up to 30 ⁇ m, but will vary dependent on the specific formulation.
  • engobe may be used in the printhead, whereby engobe is used for priming of ceramic tiles, to make the tile water permeable after pressing; or for printing raised features on the tile for wood, stone effects.
  • the body of the printhead 20 is formed of a robust material which has mechanical and chemical resistance to the specific fluids used for a particular printing application.
  • One suitable material is polyether ether ketone (PEEK) e.g. Victrex PEEK 150GL30, which has suitable mechanical and chemical resistance properties for both organic and aqueous fluids including aqueous based glaze.
  • the printhead 20 comprises a fluid chamber 22, having a fluid inlet (not shown) and fluid outlet (not shown), whereby the glaze 24 flows through the chamber 22 from the inlet to the outlet under a substantially constant pressure above atmospheric pressure e.g. 1bar.
  • the inlet and outlets are fluidly connected to a closed circuit glaze supply system.
  • the closed-circuit supply system having a supply channel to supply the glaze to the inlets and outlets, a discharge channel and means for moving and pressurizing the glaze in the conduit e.g. pumps, whereby the CCSS is controlled by e.g. an electronic ink supply system, as known in the art.
  • the printhead 20 further comprises a flexible separation member 26 e.g. formed of nitrile butadiene rubber (NBR) 70 Shore A, which is operable to seal a top portion of the chamber 22, thereby providing a sealed separation between the chamber 22 and a compartment 23 of the printhead 20.
  • the compartment 23 is provided with an actuator 30 located therein.
  • the separation member 26 is retained in position, and provides a sealing functionality by means of formations 27 formed thereon which form a mechanical engagement with reciprocal formations formed in the printhead 20, thereby retaining the sealing means in position.
  • a sealant and/or adhesive may also be used to ensure the flexible separation member 26 is retained in position and/or to improve the seal at the interface 33 between the flexible separation member 26 and the printhead 20.
  • the separation member 26 is formed of a resilient material, but it is not limited to being resilient.
  • the actuator 30 is operable to deflect from a first position as shown in Figure 2a , whereby the actuator 30 is not deflected, to a second position as shown in Figure 2b , whereby the actuator 30 deflects in a direction away from the nozzle portion 28 (in the y-plane) upon application of an electric field thereto (e.g. a voltage across electrodes of the actuator).
  • Actuator retaining elements 39 are used to retain the actuator in position relative to the chamber 22, such that the deflection of the actuator 30 relative to the chamber 22 is maximized.
  • the actuator 30 is formed of a piezoelectric element formed, for example, of lead zirconate titanate (PZT) but may be formed of barium titanate, potassium sodium niobate (KNN) and/or bismuth sodium titanate (BNT) or any suitable material.
  • PZT lead zirconate titanate
  • KNN potassium sodium niobate
  • BNT bismuth sodium titanate
  • piezoelectric elements are well known, whereby the piezoelectric elements are deflected on the application of an electric field thereto e.g. by applying a voltage differential across the layer(s) of the element.
  • the actuator 30 is a piezoelectric element, in the form of a substantially flat rectangular plate comprising one or more piezoelectric layers, configured to function as a bimorph, whereby the driving and contraction of the ceramic element creates a bending moment that converts a transversal change in length into a large bending displacement perpendicular to the contraction.
  • a piezoelectric element for example, a PICMA® Bender Piezoelectric actuator (e.g. PL112-PL140), which allows for full differential control of the displacement.
  • a PICMA® Bender Piezoelectric actuator e.g. PL112-PL140
  • the shape of the element is not restricted to being a rectangular plate, but may be square, disc or any suitable polygonal shape.
  • the actuator 30 has at least two electrodes or terminals associated with, for each piezoelectric layer, whereby the electrodes are configured for allowing the supply of a controllable electric field to the actuator 30.
  • deflection in bending mode of approximately 30 ⁇ m is provided.
  • the actuator 30 is operable to deflect in a direction away from the nozzle portion 28 on application of an electric field thereto i.e. in the Y-plane, as demonstrated by the arrow 40
  • the actuator 30 may be arranged to deflect in a direction towards the nozzle portion 28 on application of an electric field thereto.
  • An obturator assembly 31 is attached to the actuator 30 using a suitable adhesive which will not degrade in the presence of the glaze e.g. Loctite 438.
  • the obturator assembly 31 is operable to engage the nozzle portion 28, to close/open the inlet to a nozzle 29 formed therein.
  • the obturator assembly 31 comprises a connecting element, wherein, in the present embodiment, the connecting element is a connecting rod 23, which is secured to the actuator 30.
  • the connecting element can take any suitable form to connect an obturator assembly to the actuator.
  • the connecting rod 32 protrudes through the flexible separation member 26 into the chamber 22, whilst a seal is formed between the flexible separation member 26 and the obturator assembly 31 thereby maintaining the seal between the chamber 22 and the compartment 23.
  • the connecting rod 32 is fabricated using a material having mechanical and chemical properties resistant to glaze or any other fluids used in the particular printing applications required by a user e.g. Polyetherimide (PEI) such as Ultem 1000, or polyether ether ketone (PEEK) etc.
  • PEI Polyetherimide
  • PEEK polyether ether ketone
  • the nozzle has a diameter substantially equal to 400 ⁇ m
  • the nozzle preferably has a diameter between 100 ⁇ m - 600 ⁇ m, and substantially between 375 ⁇ m - 425 ⁇ m, and preferably substantially the diameter is 400 ⁇ m to ensure that nozzle does not become blocked by the particles in the glaze.
  • the nozzle portion 28 may be formed integral to the chamber 22 during fabrication of the chamber 22, or may be a separate element which is assembled into the chamber 22 during manufacture of the printhead 1, and secured in place using a suitable adhesive e.g. Loctite 438.
  • the distal end 35 of the connecting rod 32 is inserted into a valve head 36 inside the chamber 22, whereby the valve head 36 is formed to engage the substantially flat surface of the nozzle portion 28 when the actuator 30 is in the first position.
  • the valve head 36 With the actuator in the first position, the valve head 36 is engaged with an area surrounding the inlet of the nozzle 29 of the nozzle portion 28 such that no pathway exists for fluid to flow from the chamber 22 into the nozzle 29.
  • valve head 36 engages with the nozzle portion 28. Therefore, in order to reduce wear on the valve head 36, the valve head 36 is formed of a durable material, e.g. NBR 70 Shore A or Titanium Grade 5, which is capable of withstanding repeated exposure to cavitation and abrasion caused by being driven towards or against the nozzle portion 28. Similar considerations are also taken into account when selecting the material used for the nozzle portion 28, which may comprise a hard component in the form of a valve seat insert made out of titanium to achieve good durability.
  • a durable material e.g. NBR 70 Shore A or Titanium Grade 5
  • valve head 36 may be absent and the connecting rod 32 or the separation member 26 may be adapted to engage the surface surrounding the area of the inlet of the nozzle 29 to prevent/restrict fluid flow therein from the chamber 22 when the actuator is in the first position.
  • Providing a suitable voltage differential across the piezoelectric actuator 30 causes the actuator 30 to deflect to the second position, thereby causing the obturator assembly 31 attached to the actuator 30, and the separation member 26 attached thereto, to move in the direction of deflection of the actuator 30, such that the valve head 36 disengages from surface surrounding the area of the inlet of the nozzle 29, whereby a pathway is formed such that glaze flows from the chamber 22 and into the nozzle 29 i.e. thereby filling the nozzle 29.
  • the flexible separation member 26 allows for deflection of the actuator 30 in the compartment 23 to effect movement of the valve head 36 inside the chamber 22, such that drops of glaze can be deposited on the substrate 38 through the nozzle 29 in a controlled manner, without risk of the actuator 30 coming into contact with the glaze.
  • the voltage differential ( ⁇ V) across the actuator 30 is increased from V0 (e.g. 0V) to V1 (e.g. 30V).
  • V0 e.g. 0V
  • V1 e.g. 30V
  • the actuator 30 will deform and deflect (e.g. 30 ⁇ m) from the first position as shown at Figure 2a to the second position as shown in Figure 2b , resulting in a separation of the valve head 36 from the nozzle portion 28.
  • the bottom surface 40 of the valve head 36 blocks the nozzle 29 and a drop is ejected from the nozzle towards the substrate 38 during the time 94.
  • the waveform shown in Figure 3 is repeated at a frequency of 1 kHz, for as long as drops are required to be ejected from the nozzle.
  • the frequency/drive time (90, 92, 94) may be increased or decreased as required by a user e.g. to increase or decrease the volume of the printed drop, or to increase the frequency of drop ejection from the printhead 20.
  • the differential is held substantially at V0.
  • the print head 20 of the present invention comprises the advantage of being both mechanically and electronically adjustable, so that the print head 20 is flexible and versatile, and adaptable to various desired applications, and to various ceramic glazes e.g. aqueous based and solvent based glazes. It will also be appreciated that a variety of different inks with different fluid properties could be used by modifying various parameters of the printhead 20 e.g. deflection of the actuator, the nozzle diameter, drive voltage etc. as required.
  • Figure 4 shows in perspective view a cross section of a printhead 50.
  • the printhead 50 comprises a fluid chamber 52 having a flexible separation member in the form of a diaphragm 53, a side wall 54, a top-wall 59 and a nozzle portion 56.
  • the side wall 54 comprises a glaze inlet 55 in fluid connection with a glaze manifold (not shown), through which glaze enters the chamber 52 from the manifold, and a glaze outlet (not shown) in fluid connection with the manifold, through which fluid leaves the chamber 52 into the manifold.
  • the nozzle portion 56 is formed of KETRON®PEEK 100 NATURAL and is arranged to sealably fit into the housing of the chamber 52.
  • a nozzle 60 having a diameter ⁇ of approximate 400 ⁇ m is provided in the nozzle portion 56.
  • the nozzle 60 provides a fluid pathway from the chamber 52 to atmosphere 51.
  • the specific diameter ⁇ of the nozzle is chosen dependent for example on the specific fluid properties and the desired drop volume range.
  • the diameter may be in the range of 80 ⁇ m - 1000 ⁇ m, whilst for applications using ink solutions e.g. MEK based or Acetone ink, the diameter may be in a much smaller range e.g. in the order of 10-60 ⁇ m.
  • an adhesive e.g. Loctite 438 is provided around the formation 62, and when the diaphragm is inserted into the chamber 52, the formation 62 engages with formation 65, and the adhesive retains the diaphragm 53 in position relative to the chamber 52, thereby providing a sealing functionality between the chamber 52 and the compartment 63.
  • the diaphragm 53 locates within a central aperture of the top wall 59.
  • the diaphragm 53 is further provided with a central aperture 66 through which an elongated connecting rod 68, formed e.g. of Ultem 1000, is inserted.
  • the formation may be secured relative to the elongated connecting rod 68 using e.g. Loctite 438.
  • a first end of the elongated connecting rod 68 is secured to the actuator 64 using a suitable adhesive e.g. Loctite 438.
  • valve head 76 is formed as a cylindrical structure having a closed end 78 and an open end 80, whereby the open end 80 is formed to receive the distal end of the elongated connecting rod 68.
  • the distal end of the connecting rod 68 is inserted into the valve head 76 and secured relative thereto using a suitable adhesive e.g. Loctite 438.
  • the valve head 76 is formed of a material having a high mechanical resistance to wear e.g. NBR 70 Shore A or Titanium Grade 5, although using a deformable material for the valve head 76 such as NBR allows for reduced contact energy because the valve head 76 will deform to correct for nonplanar alignment between valve head and valve seat such the overall impact energy is reduced.
  • the open end 80 of the valve head 76 is also formed to engage with a diaphragm 88 e.g. an elastomeric 'O'-ring to seal the connecting rod 68 from the inside of the chamber 52 and to ensure that glaze does not leak from the chamber 52 into the compartment 63.
  • a diaphragm 88 e.g. an elastomeric 'O'-ring to seal the connecting rod 68 from the inside of the chamber 52 and to ensure that glaze does not leak from the chamber 52 into the compartment 63.
  • a valve seat 82 is provided atop the nozzle portion 56 around the entrance to the nozzle 60 inside the chamber 52.
  • the valve seat 82 is formed as an annular insert which engages with the nozzle portion 56; such that the top surface of the valve seat 82 is flush with the entrance 83 to the nozzle 60.
  • the valve seat 82 may be formed of a material which has a good mechanical resistance to wear e.g. Titanium Ti-6AI-4V grade 5.
  • valve seat 76 in order to prevent the valve seat 76 becoming dislodged in operation, it may be secured relative to the nozzle portion 56 using a suitable adhesive e.g. Loctite 438, or it may be a friction fit e.g. "click-fit.”
  • a suitable adhesive e.g. Loctite 438
  • a friction fit e.g. "click-fit.”
  • the bottom surface 79 of the valve head 76 is operable to engage with the valve seat 82 to seal/close the inlet 83 to the nozzle 60, such that when the valve head 76 is in contact with the valve seat 82 the entrance 83 to the nozzle 60 is sealed relative to the chamber 52, such that glaze is prevented/restricted from flowing from the chamber 52 into the nozzle 60, whilst when there is no contact between the valve head 76 and the valve seat 82, the nozzle 60 is not sealed relative to the chamber 52, and glaze is not prevented/restricted from flowing from the chamber 52 into the nozzle 60.
  • the operation of the printhead 50 is similar to the operation of the printhead 20, and a similar waveform as shown in Figure 3 can we applied to the actuator 64.
  • a voltage differential is applied across the actuator 64, the actuator 64 deflects in the Y-direction from a first non-deflected position to a second deflected position.
  • the elongated connecting rod 68 is secured relative to the actuator 64, whilst the valve head 76 is secured relative to the connecting rod 68 at a distal end 89 thereof, and, therefore, the elongated connecting rod 68 and the valve head 76 will deflect inside the chamber 52 in the same direction as the actuator 64, which is located outside of the chamber in the compartment 63.
  • the flexible separation member 26 of the first embodiment forms substantially the whole top wall of the chamber 22.
  • the separation member 26 is an element which does not form substantially the whole of a wall, but for example, may simply be a rubber 'O' ring(s) insertable into an annular groove in a diametric aperture of a non-flexible top wall of the chamber 22, through which the connecting rod 32 is inserted, whereby the 'O'-ring(s) is in contact with the separation member 26.
  • the 'O' - ring(s) allows for the same functionality as discussed above, in that the connecting rod, coupled to a valve head in a chamber and to an actuator outside the chamber, is caused to deflect by deflection of the actuator thereby closing/opening the nozzle inlet accordingly, whilst the 'O' - ring located in contact with the connecting rod provides a sealing functionality between the fluid chamber and the actuator, whilst also allowing the actuator effect movement of the valve head.
  • a deflection of up to 20-60 ⁇ m's is desirable, such that a separation of approximately 20-60 ⁇ m is provided between the bottom surface of the valve head 76 and the valve seat 82 when the actuator is deflected. Such a separation is sufficient for the water-based glaze to pass from the chamber 52 into the nozzle 60.
  • deflection of approximately 30 ⁇ m is preferred, but it will be seen that deflection of up to 600 ⁇ m could be used in operation, depending on the specific properties of the fluid to be printed, and the specific application. For example MEK based inks are less viscous than glaze, and have a smaller particle size distribution, and so will flow more easily through a smaller separation than the glaze.
  • the printhead comprises a fluid chamber, designed to contain the glaze to be deposited on a substrate, whereby the glaze is supplied to the chamber 52 from a controlled glaze supply system via an inlet and an outlet at a pressure of e.g. 0.1Bar - 10Bar, and preferably, wherein the pressure is preferably between 0.5 and 1.5Bar, and preferably substantially equal to 1Bar.
  • An electronically controlled closed fluid supply system 103 as shown in Figures 5a and 5b having e.g. pressure monitoring equipment 104, valves 105 etc. enables a modification of the speed of circulation of the glaze internally of the conduit; and maintains a constant flow of glaze around the system at a controlled pressure e.g. 1Bar.
  • the continuous and controlled flow of the glaze prevents sedimentation of the -components contained in the suspension, a vital condition for good functioning of the head, and provides for consistent pressure in the printhead.
  • Figure 5a shows a printer 100 having a printhead 101 formed by several discrete printheads 102, arranged side by side.
  • the printheads 102 are as described above in relation to Figures 2a , 2b and 4 .
  • the printheads 102 are arrayed and may be angled to the direction of substrate travel, so as to adjust the distance between the nozzles 29 of adjacent printheads 102. It will also be seen, that fewer or more printheads 102 can be added to the printhead 101.
  • the individual heads may be designed to interlock such as to provide a continuous fluid flow through each head by providing means that connect the fluid inlets and fluid outlets of neighboring chambers, so that the fluid flow through all heads can be controlled by the same closed circuit supply system.
  • a single printhead 101 having a plurality of nozzles 29 formed within a single chamber is also achievable, whereby a single fluid chamber having a plurality of obturators (not shown) to close/open the nozzles 29 is provided, whereby the obturators are each controllable by respective actuators located outside of the chamber, in the manner as described above.
  • the printheads 101, 102 described above can be advantageously used not only for decoration, finishing and texturing of ceramic tiles, but as a result of the size of the drops of glaze which can be obtained it can also be employed in full-surface glazing.
  • glaze can be ejected from the printhead in a controlled manner. Unlike the conventional printheads, water-based glaze can be deposited using the printhead 50.
  • adjusting the parameters of the printhead can influence the final graphic effect, and improve the functionality and performance of the head.
  • the diameter of the nozzle 29 can be varied to provide access to different ranges of drop volumes and ejection frequencies.
  • the benefits of depositing of a larger diameter particles and high solid content fluids such as glaze and engobe are apparent.
  • the ability to add large size pigment particles of 20-30 ⁇ m to a glaze results in a high colour density and full flexibility to apply colour glaze digitally. This is not possible to achieve with printheads having a nozzle diameter of ⁇ 50 ⁇ m where the pigment diameter has to be kept low.
  • the pressure at which the glaze is maintained in circulation internally of the printhead is adjustable in a controlled manner according to the density and viscosity of the glaze. In this way the quantity of glaze exiting from the nozzle can be controlled e.g. whilst maintaining a constant drive waveform, the volume of the printed drops will increase by increasing the pressure in the system, whilst the volume of the drops will be decreased by decreasing the pressure in the system.
  • Such functionality is also obtainable by maintaining a constant pressure and modifying the drive waveform. For example, reducing the time for which the V1 drive voltage is applied to the actuator (Time 92 in Figure 3 ) to open the inlet to the nozzle results in a reduced drop volume because the amount of fluid flowing into the nozzle and available for ejection is limited to the time the nozzle is being filled.
  • actuators other than piezoelectric actuators could be used to provide the same driving functionality to effect droplet ejection, for example electrostatic actuators, magnetic actuators, electrostrictive actuators, Thermal uni/bi morph elements, solenoids, shape memory alloys etc. could readily be used to provide the functionality described above whilst obtaining the desirable functionality as will be apparent to the skilled person upon reading the above specification.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Coating Apparatus (AREA)

Claims (7)

  1. Tête d'impression (20) comprenant :
    une chambre (52) ;
    un élément actionneur piézoélectrique (64) situé à l'extérieur de la chambre (52) ;
    un obturateur (68, 76) comprenant une tige de raccordement allongée (68) fixée par rapport à l'élément actionneur piézoélectrique (64), et une tête de valve (76) fixée par rapport à la tige de raccordement (68) à une extrémité distale (89) de celle-ci, dans laquelle l'élément actionneur piézoélectrique (64) est couplé à l'obturateur (68, 76) ;
    un compartiment (63) servant à retenir l'élément actionneur piézoélectrique (64) ;
    dans laquelle : l'élément actionneur piézoélectrique (64), la tige de raccordement allongée (68) et la tête de valve (76) dévient dans une même première direction (Y) d'une première position non déviée à une seconde position déviée ; la tige de raccordement allongée (68) et la tête de valve (76) dévient à l'intérieur de la chambre (52) dans la première direction (Y) ;
    une partie de l'obturateur (68, 76) étant située à l'intérieur de la chambre (52) et pouvant être actionnée pour se déplacer d'une première position à l'intérieur de la chambre (52) à une seconde position à l'intérieur de la chambre (52) lors de l'actionnement de l'élément actionneur piézoélectrique (64) ;
    un élément séparateur (53) servant à séparer la chambre (52) et le compartiment (63), l'élément séparateur (53) étant constitué d'une partie flexible ; l'élément séparateur (53) se mettant en prise avec l'obturateur (68, 76) et pouvant être actionné pour fournir le mouvement de l'obturateur (68, 76) situé à l'intérieur de la chambre (52) lors de l'actionnement de l'élément actionneur dans le compartiment (63),
    dans laquelle deux éléments de retenue (86) élastomères sont utilisés pour retenir l'élément actionneur piézoélectrique (64) en position par rapport à la chambre (52) ; dans laquelle ladite tête de valve est formée comme étant une structure cylindrique comportant une extrémité fermée (78) et une extrémité ouverte (80) ;
    dans laquelle ladite tête d'impression (20) comprend également un diaphragme (88) et dans laquelle ladite extrémité ouverte (80) est formée pour recevoir l'extrémité distale de la tige de raccordement (68) et est également formée pour se mettre en prise avec ledit diaphragme (88) pour sceller la tige de raccordement (68) de l'intérieur de la chambre (52).
  2. Tête d'impression selon la revendication précédente, dans laquelle l'élément actionneur est couplé mécaniquement à l'obturateur.
  3. Tête d'impression selon la revendication 1, dans laquelle la chambre de fluide comprend au moins une buse.
  4. Tête d'impression selon la revendication 3, dans laquelle l'obturateur peut être actionné pour fermer ou ouvrir partiellement l'entrée de l'au moins une buse lors de l'actionnement de l'élément actionneur.
  5. Tête d'impression selon la revendication 1, dans laquelle l'élément de séparation (53) peut être mis en prise avec une partie de la chambre (52).
  6. Imprimante comportant une tête d'impression selon l'une quelconque des revendications 1 à 5.
  7. Procédé d'impression à jet d'encre, le procédé comprenant l'utilisation de l'imprimante selon la revendication 6 pour déposer un fluide sur le substrat.
EP13425119.8A 2013-08-29 2013-08-29 Têtes d'impression pour décorer des substrats céramiques Active EP2842753B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES13425119T ES2861950T3 (es) 2013-08-29 2013-08-29 Cabezal de impresión para decorar sustratos cerámicos
EP13425119.8A EP2842753B1 (fr) 2013-08-29 2013-08-29 Têtes d'impression pour décorer des substrats céramiques

Applications Claiming Priority (1)

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EP13425119.8A EP2842753B1 (fr) 2013-08-29 2013-08-29 Têtes d'impression pour décorer des substrats céramiques

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EP2842753B1 true EP2842753B1 (fr) 2021-01-20

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ITUA20164471A1 (it) 2016-06-17 2017-12-17 System Spa Ugello per stampanti a getto di inchiostro
TWI625468B (zh) 2016-09-05 2018-06-01 研能科技股份有限公司 流體控制裝置
TWI602995B (zh) 2016-09-05 2017-10-21 研能科技股份有限公司 流體控制裝置
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JP6772725B2 (ja) 2016-09-29 2020-10-21 セイコーエプソン株式会社 流体吐出装置および流体を吐出する方法
JP2018051478A (ja) * 2016-09-29 2018-04-05 セイコーエプソン株式会社 流体吐出装置および流体を吐出する方法
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DE102016014919A1 (de) 2016-12-14 2018-06-14 Dürr Systems Ag Applikationsvorrichtung und Verfahren zum Applizieren eines Beschichtungsmittels
DE102016014943A1 (de) 2016-12-14 2018-06-14 Dürr Systems Ag Druckkopf mit Temperiereinrichtung
DE102016014953A1 (de) 2016-12-14 2018-06-14 Dürr Systems Ag Lackieranlage und entsprechendes Lackierverfahren
DE102016014952A1 (de) 2016-12-14 2018-06-14 Dürr Systems Ag Beschichtungseinrichtung zur Beschichtung von Bauteilen
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