EP2849951B1 - Tintenstrahldrucker - Google Patents

Tintenstrahldrucker Download PDF

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Publication number
EP2849951B1
EP2849951B1 EP13727423.9A EP13727423A EP2849951B1 EP 2849951 B1 EP2849951 B1 EP 2849951B1 EP 13727423 A EP13727423 A EP 13727423A EP 2849951 B1 EP2849951 B1 EP 2849951B1
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EP
European Patent Office
Prior art keywords
ink
tank
gutter
makeup
solvent
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
EP13727423.9A
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English (en)
French (fr)
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EP2849951A1 (de
Inventor
Michael Stamp
Philip Blowfield
Robert Smith
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.)
Videojet Technologies Inc
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Videojet Technologies Inc
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Publication date
Application filed by Videojet Technologies Inc filed Critical Videojet Technologies Inc
Publication of EP2849951A1 publication Critical patent/EP2849951A1/de
Application granted granted Critical
Publication of EP2849951B1 publication Critical patent/EP2849951B1/de
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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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers

Definitions

  • the present invention relates to ink jet printing and more particularly to a continuous ink jet printer with reduced solvent consumption.
  • ink jet printing systems the print is made up of individual droplets of ink generated at a nozzle and propelled towards a substrate.
  • drop on demand where ink droplets for printing are generated as and when required; and continuous ink jet printing in which droplets are continuously produced and only selected ones are directed towards the substrate, the others being recirculated to an ink supply.
  • Continuous ink jet printers supply pressurized ink to a print head assembly having a drop generator where a continuous stream of ink emanating from a nozzle is broken up into individual regular drops by an oscillating piezoelectric element.
  • the drops are directed past a charge electrode where they are selectively and separately given a predetermined charge before passing through a transverse electric field provided across a pair of deflection plates.
  • Each charged drop is deflected by the field by an amount that is dependent on its charge magnitude before impinging on the substrate whereas the uncharged drops proceed without deflection and are collected at a gutter from where they are recirculated to the ink supply for reuse.
  • a phase measurement system is also usually present as part of deflection plate assembly and is used to ensure synchronization of deflection for the droplets.
  • the charged drops bypass the gutter and hit the substrate at a position determined by the charge on the drop and the position of the substrate relative to the print head assembly.
  • the substrate is moved relative to the print head assembly in one direction and the drops are deflected in a direction generally perpendicular thereto, although the deflection plates may be oriented at an inclination to the perpendicular to compensate for the speed of the substrate (the movement of the substrate relative to the print head assembly between drops arriving means that a line of drops would otherwise not quite extend perpendicularly to the direction of movement of the substrate).
  • a character is printed from a matrix comprising a regular array of potential drop positions.
  • Each matrix comprises a plurality of columns (strokes), each being defined by a line comprising a plurality of potential drop positions (e.g. seven) determined by the charge applied to the drops.
  • strokes each being defined by a line comprising a plurality of potential drop positions (e.g. seven) determined by the charge applied to the drops.
  • each usable drop is charged according to its intended position in the stroke. If a particular drop is not to be used then the drop is not charged and it is captured at the gutter for recirculation. This cycle repeats for all strokes in a matrix and then starts again for the next character matrix.
  • Ink is delivered under pressure to the print head assembly from an ink supply system that is generally housed within a sealed compartment of a cabinet that includes a separate compartment for control circuitry and a user interface panel.
  • the system includes a main pump that draws the ink from a reservoir or tank via a filter and delivers it under pressure to the print head assembly.
  • an ink source such as a replaceable ink cartridge that is releasably connected to the reservoir by a supply conduit.
  • the ink is fed from the reservoir via a flexible delivery conduit to the print head assembly. Electrical power to operate the heater in the print head assembly and the drop generator are supplied by power supply system cables, typically forming part of the supply conduit.
  • the unused ink drops captured by the gutter are recirculated to the reservoir via a return conduit, typically located as part of the supply conduit, by a pump.
  • the flow of ink in each of the conduits is generally controlled by solenoid valves and/or other like components.
  • US 4 998 116 discloses a cell having a variable volume chamber and a fluid supply circuit for an ink jet printing head which is equipped therewith.
  • the present disclosure provides a continuous ink jet printing system with improved management of ink viscosity and reduced solvent loss from the system.
  • a continuous ink jet printer according to claim 1 is disclosed.
  • the present disclosure provides a continuous ink jet printing system with improved management of ink viscosity and reduced solvent loss from the system.
  • Solvent is recovered from the air in the gutter line and made available for reuse within the system.
  • a condenser and/or a heater is used to prevent liquid condensate from returning to the gutter.
  • the system allows control of the gutter entrance airflow to ensure reliable gutter clearing.
  • FIG. 1 is a schematic view showing a continuous ink jet printer 10.
  • the printer 10 includes a fluid system 20, a print module 30, and a condenser 40.
  • the fluid system 20 includes an ink or mixer tank 22 for holding ink and a makeup tank 24 for holding solvent.
  • Ink source 16 and solvent source 18 provide fluids to mixer tank 22.
  • Solvent is added to the ink or mixer tank 22 during operation of the printer to replace solvent loss due to evaporation and to properly control the ink viscosity.
  • Inks for continuous ink jet printers are typically complex mixtures of many substances, with a large proportion of volatile organic solvents. Typical organic solvents include methyl ethyl ketone (MEK), acetone, and ethanol.
  • MEK methyl ethyl ketone
  • the print module 30 includes a nozzle 32 in fluid communication with the ink tank for ejecting ink droplets and a gutter 34 for receiving, through an ink-receiving inlet thereof, ink droplets which are not used for printing.
  • a gutter flow path 50 starts at the ink-receiving inlet or orifice and provides fluid communication to the ink tank, for ink and air that has entered the gutter 34 through the ink-receiving inlet.
  • a return line 52 is in fluid communication with the gutter 34 for conveying air from the makeup tank 24 to enter the gutter flow path 50.
  • the makeup tank 24 is in vapor communication with the ink tank 22 to allow air to be conveyed from the ink tank to the makeup tank.
  • vapor communication is meant that vapor, but not necessarily liquid, can travel between the makeup tank 24 and the ink tank 22.
  • the makeup tank 24 is to be distinguished from conventional solvent sources (like solvent source 18) used in CIJ printers.
  • Makeup tank 24 includes liquid solvent condensed from air in the printer system itself, in contrast to liquid makeup added to the system from a liquid source like solvent source 18. In general, liquid ink will not be conveyed from ink tank 22 to makeup tank 24, but rather only solvent laden air.
  • fluid system 20 may be a single unit, including ink tank 22 and makeup tank 24, that is divided by a wall 26, for example, into fluid storage areas 22 and 24.
  • An opening 28 is disposed at a top portion of the wall 26 to provide vapor communication between ink tank 22 and makeup tank 24 under normal operation.
  • the ink tank 22 may contain a volume of 0.5 L to 2 L, generally between 1 L and 1.5 L.
  • the makeup tank 24 may contain a volume of 0.2 L to 1 L, generally between 0.5 L to 0.75 L.
  • a condenser 40 is in fluid communication with the makeup tank 24 and the return line 52 for condensing solvent from the makeup tank 24.
  • Condenser 40 is disposed between makeup tank 24 and the return line 52 to gutter 34.
  • Condenser 40 may be disposed directly above (e.g. at a top portion of) the makeup tank 24.
  • the condenser 40 is adapted to receive exhaust from the makeup tank 24 and condense solvent from the exhaust. Exhaust from the ink reservoir 24 will generally include air, organic solvent, and ink particles.
  • the makeup tank 24 and ink tank 22 may be under pressure to provide a force to move the exhaust.
  • the pressure may be any suitable pressure, but it has been found that a pressure of at least 0.1 Bar is sufficient.
  • the ink tank 22 and makeup tank 24 are separate containers.
  • Line 21 provides fluid communication from ink tank 22 to condenser 41.
  • the condenser 41 is adapted to receive exhaust from the ink tank 22 and the makeup tank 24 and condense the solvent from the exhaust, returning the condensed solvent to makeup tank 24.
  • Line 66 may provide fluid communication between solvent tank 24 and mixer tank 22 to allow makeup to be added to the ink tank 22 if the ink viscosity becomes too high or the makeup tank 24 becomes too full, for example.
  • Solvent source 18 may provide solvent to makeup tank 24 and/or ink tank 22. It will be apparent to those skilled in the art that, to the extent features are described herein with respect to the first embodiment of a fluid system 20, they may also be applied to the second embodiment of a fluid system 25.
  • the condenser 40 may be an active condenser. Alternatively condenser 40 may be a passive condenser, meaning it does not require any power or moving parts to operate. Such condensers are known in the art and any suitable condenser may be used.
  • the condenser 40 includes an inlet 42 for receiving the exhaust from the makeup tank 24.
  • a condensing chamber 44 is in fluid communication with the inlet 42. Because the walls of the condensing chamber 44 are at a lower temperature than the exhaust, fluid condenses from the exhaust in the condensing chamber 44. This allows condensed solvent and ink particles to be removed from the air stream.
  • An outlet 46 is in fluid communication with the return line 52 for providing air flow from the condenser 40 to the gutter 34. Condensed fluid flows back into makeup tank 24 from condenser 40.
  • Condenser 40 (or 41) is preferably disposed physically above makeup tank 24 to allow condensed solvent to flow by gravity into makeup tank 24.
  • the system 10 may include a gutter pump 62 (or venturi jet pump or a vacuum source) in fluid communication with the gutter 34 to draw air and unused ink droplets from the gutter 34 into the ink tank 32 via line 50.
  • the system 10 may include an ink pump 60 in fluid communication between the ink tank 22 and the nozzle 32 to provide ink to the nozzle via line 50.
  • a vent or purge line 56 may be used under certain conditions to purge air from the system.
  • the purge line 56 may be located in any suitable location, such as the ink tank 22 (as shown in FIG. 2 ), the makeup tank 24, or off of the recirculation line 52 (as shown in FIG. 1 ).
  • the system 10 may include a heater to heat the air to ensure that it does not include any liquid solvent.
  • a heater is integrated into the condenser 40 to heat the air used in the recirculation line 52.
  • a heater 64 is provided in the recirculation line 52 close to the point that the recirculated air is returned to the gutter 34. The heater 64 can be used to force any remaining solvent to a vapor state so that liquid solvent does not interfere with gutter clearing.
  • the system 10 may include small bore piping or high recirculation air flow in the return line, compared to a conventional continuous ink jet ink jet printer.
  • the use of small bore piping and/or increased air flow reduces the size of the solvent droplets that are returned to the gutter 34 if the system is run without sufficient condensing or heating, to ensure only vapor reaches the gutter 34.
  • conventional CIJ printers may use piping with an inner diameter (ID) of 4 mm or 1.6 mm.
  • the piping of the present embodiment may have an ID of 1.6 mm or less, 1.0 mm or less, or 0.5 mm or less.
  • the system described herein may be used with existing continuous ink jet systems with the necessary modification, such as that disclosed in US Pat. No. 8,408,684 (commonly assigned with the present application to Videojet Technologies Inc.), the contents of which are hereby incorporated by reference.
  • the system may include other components that are commonly used in continuous ink jet printers but which are not shown in the present figures.
  • the system may include a solvent line (not shown) from solvent source 18 or makeup tank 24 to the print head 30, for flushing the nozzle during startup and shutdown.
  • solvent line not shown from solvent source 18 or makeup tank 24 to the print head 30, for flushing the nozzle during startup and shutdown.
  • FIGS. 1 and 2 it is apparent that various components may be combined together in different orientations and configurations.
  • the system may include separate ink and solvent containers, such as the cartridges disclosed in US Pat. No.
  • an ink source 16 is provided to mixer tank 22 and a solvent source 18 is provided to mixer tank 22 and/or solvent reservoir 24.
  • the gutter 34 may be of any suitable design.
  • One embodiment of a gutter is shown in FIG. 3 . It is apparent that the gutter 34 will have a first inlet or orifice 35 to collect ink droplets that are not used for printing, a second inlet 36 for the recirculated air from line 52, and an outlet 37 connected to gutter flow path 50 for the combined ink and air mixture.
  • Ink inlet 35 and gutter outlet 37 may be disposed essentially in a straight line with each other, with air inlet 36 disposed at an acute angle of about 45° with respect to ink inlet 35. It will be apparent that other gutter designs are possible. Gutter designs such as those shown in US Pat. No.
  • the gutter may be concave or slotted such as that shown in US 20110134183 .
  • the disclosed embodiments may be used with single nozzle CIJ systems, dual nozzle systems, or multiple nozzle (binary array) systems.
  • the printer 10 may be operated as follows.
  • the system 10 may include valves and restrictors to reduce or turn off re-circulation to give gutter suction during jet startup or other operating conditions.
  • purge line 56 may be open to allow air to be removed from the system.
  • Ink pump 60 transfers ink from ink tank 22 through ink line 54 into nozzle 32. Ink droplets are ejected from nozzle 32. Droplets that are not used for printing are collected in gutter 34 and returned to the ink tank 22 via gutter flow path 50 and gutter pump 62. The air in gutter flow path 50 will be laden with solvent and include ink particles. Solvent-laden air passes through opening 28 from ink tank 22 to makeup tank 24.
  • Condenser 40 condenses solvent from the air flow and returns the solvent to makeup tank 24. Air is recirculated through recirculation line 52 to gutter 34. Line 52 may directly connect the condenser 40 to the print head 30 and gutter 34. Compared to a conventional continuous ink jet system, this arrangement reduces or virtually eliminates the amount of ambient air introduced into the system and thus reduces solvent loss to the exterior environment.
  • the system 10 may have various controls on the ink and solvent levels in tanks 22 and 24. For example, during cleaning, solvent may be run through the system to removes dried ink and debris. The system 10 thus may include a level sensor so that if the volume of solvent in the makeup tank 24 becomes too high, it is transferred to another container.
  • the condenser 41 (or other separator) could be located in the print head 30 closer to the receiving orifice of the gutter 34.
  • This location of the condenser 41 has the advantage of overcoming the possibility of any further liquid condensing in the recirculation line 52, which may be located some meters away from the ink system. Additionally, this allows the recirculation line 52 to act as part of the condensing system.
  • the system disclosed herein has an advantage in that it gives the ability to thicken the ink (i.e. by condensing solvent) while recirculating air back to the gutter rather than venting to atmosphere. It also makes the recovered solvent available for reuse. It reduces the likelihood of gutter welling/overflow by reducing the liquid within the recirculating line. It also provides reduced make-up consumption and cost of ownership, enhanced ability to operate in high humidity without air dryer, reduced solvent odor and VOC emissions, and reduced ink oxidization.
  • the system preferably is able to reduce solvent consumption to less than 3.5 ml/hr, preferably less than 3.0 ml/hr, or less than 2.5 ml/hr, with a volatile organic solvent such as MEK, acetone, or ethanol. Tests using the disclosed system have been able to achieve solvent use of 3.3ml/hr using MEK.

Landscapes

  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (15)

  1. Kontinuierlicher Tintenstrahldrucker, der Folgendes umfasst:
    einen Tintentank zum Aufbewahren von Tinte;
    ein Druckmodul;
    eine Tintendüse, die im Druckmodul angeordnet ist und die in Fluidverbindung mit dem Tintentank steht, um Tintentröpfchen auszustoßen;
    eine Rinne, die im Druckmodul angeordnet ist, um durch einen tintenaufhehmenden Einlass davon Tintentröpfchen aufzunehmen, die nicht zum Drucken verwendet werden;
    einen am tintenaufnehmenden Einlass beginnenden Rinnenflussweg für die Tinte, die durch den tintenaufnehmenden Einlass in die Rinne eingedrungen ist, und der die Fluidverbindung zum Tintentank bereitstellt;
    einen Hilfstank in Dampfverbindung mit dem Tintentank, damit Luft aus dem Tintentank zum Hilfstank geleitet werden kann;
    eine Rückführungsleitung; und
    einen Kondensator, der in Fluidverbindung mit dem Hilfstank und der Rückführungsleitung steht;
    wobei:
    die Rückführungsleitung in Fluidverbindung zwischen dem Hilfstank und der Rinne steht, um Luft aus dem Hilfstank in den Rinnenflussweg zu übertragen; und
    der Kondensator zwischen dem Hilfstank und der Rückführungsleitung angeordnet ist, wobei der Kondensator angepasst ist, um Abgas aus dem Hilfstank aufzunehmen und Lösemittel aus dem Abgas zu kondensieren, wobei das kondensierte Lösemittel an den Hilfstank zurückgeführt wird.
  2. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, der ferner eine Pumpe umfasst, die im Rinnenflussweg angeordnet ist, um Fluid von der Rinne zu leiten.
  3. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, der ferner eine Vakuumquelle umfasst, die im Rinnenflussweg angeordnet ist, um Fluid von der Rinne zu leiten.
  4. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, der ferner eine Tintenversorgungsleitung umfasst, die zwischen dem Tintentank und der Tintendüse angeordnet ist und die optional ferner eine Tintenpumpe umfasst, die in der Tintenversorgungsleitung angeordnet ist.
  5. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, wobei der Kondensator ein passiver Kondensator oder ein aktiver Kondensator ist.
  6. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, wobei der Kondensator über dem Hilfstank angeordnet ist.
  7. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, der ferner Folgendes umfasst:
    einen Heizkörper, der in der Rückführungsleitung benachbart zum Kondensator angeordnet ist, um aus dem Hilfstank geleitete Luft zu erhitzen; oder
    einen Heizkörper, der in der Rückführungsleitung benachbart zur Rinne angeordnet ist, um aus der Rinne geleitete Luft zu erhitzen.
  8. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, wobei der Hilfstank und der Tintentank in einer einzelnen Komponente integriert sind.
  9. Kontinuierlicher Tintenstrahldrucker nach Anspruch 8, wobei die einzelne Komponente eine Wand umfasst, die zwischen dem Hilfstank und dem Tintentank mit einer Öffnung benachbart zu einer Oberseite der Komponente angeordnet ist, um eine Dampfverbindung zwischen dem Hilfstank und dem Tintentank zu erlauben.
  10. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, wobei der Hilfstank und der Tintentank separate Komponenten sind.
  11. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, wobei die Rückführungsleitung Luft mit verdampftem Lösemittel in einer Menge umfasst, die kleiner als die Sättigung ist, und die im Wesentlichen frei von flüssigem Lösemittel ist.
  12. Kontinuierlicher Tintenstrahldrucker nach Anspruch 1, der ferner eine Entlüftung zum Ablassen von Luft aus dem Drucker umfasst.
  13. Verfahren zum Betreiben eines kontinuierlichen Tintenstrahldruckers, das Folgendes umfasst:
    Leiten von Tinte aus dem Tintentank zu einer Tintendüse, die in einem Druckmodul angeordnet ist;
    Ausstoßen von Tintentröpfchen aus der Düse;
    Aufnehmen von Tintentröpfchen, die nicht zum Drucken verwendet werden, durch einen tintenaufnehmenden Einlass einer Rinne;
    Leiten von Tinte, die durch den tintenaufnehmenden Einlass in die Rinne eingedrungen ist;
    Leiten von Luft von einem Hilfstank zur Rinne,
    Leiten von Luft von dem Tintentank zum Hilfstank; und
    Kondensieren von Lösemitteln aus Luft aus dem Hilfstank und Leiten des kondensierten Lösemittels zum Hilfstank.
  14. Verfahren nach Anspruch 13, das ferner das Ablassen von Luft aus dem Drucker in eine Außenumgebung umfasst.
  15. Verfahren nach Anspruch 13, das ferner das Entfernen von Lösemittel aus dem Tintentank durch Kondensieren des Lösemittels in den Hilfstank umfasst.
EP13727423.9A 2012-05-14 2013-05-13 Tintenstrahldrucker Active EP2849951B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261646412P 2012-05-14 2012-05-14
PCT/US2013/040698 WO2013173200A1 (en) 2012-05-14 2013-05-13 Ink jet printer

Publications (2)

Publication Number Publication Date
EP2849951A1 EP2849951A1 (de) 2015-03-25
EP2849951B1 true EP2849951B1 (de) 2018-07-11

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EP13727423.9A Active EP2849951B1 (de) 2012-05-14 2013-05-13 Tintenstrahldrucker

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EP (1) EP2849951B1 (de)
CN (1) CN104507689B (de)
WO (1) WO2013173200A1 (de)

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US20150160111A1 (en) * 2013-12-06 2015-06-11 Videojet Technologies Inc. Viscometer
FR3045458B1 (fr) * 2015-12-22 2018-02-16 Dover Europe Sarl Imprimante a jet d'encre a circuit de recuperation de solvant ameliore
GB2551321B (en) * 2016-06-07 2021-06-09 Linx Printing Tech Ink jet printer
FR3055108A1 (fr) 2016-08-16 2018-02-23 Dover Europe Sarl Procede et dispositif de filtrage de l'atmosphere recyclee d'une tete d'impression
JP6626801B2 (ja) * 2016-08-22 2019-12-25 株式会社日立産機システム インクジェット記録装置
EP3582869A1 (de) * 2017-02-16 2019-12-25 HP Indigo B.V. Kondensierung von verdampftem fluid
GB2575986A (en) * 2018-07-30 2020-02-05 Domino Uk Ltd Solvent supply tube arrangement

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FR2619753B2 (fr) * 1986-12-10 1990-08-31 Imaje Sa Circuit d'alimentation fluide d'une tete d'impression equipee d'une cellule multifonctions comportant une chambre a volume variable
JPH01247167A (ja) * 1988-03-30 1989-10-03 Hitachi Ltd インクジェット記録装置のインク回収装置
US5469202A (en) * 1992-03-20 1995-11-21 Scitex Digital Printing, Inc. Continuous ink jet catcher with improved screen structure
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GB0720290D0 (en) * 2007-10-12 2007-11-28 Videojet Technologies Inc Ink jet printer
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Publication number Publication date
CN104507689A (zh) 2015-04-08
EP2849951A1 (de) 2015-03-25
CN104507689B (zh) 2016-11-16
WO2013173200A1 (en) 2013-11-21

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