EP4338969A1 - Procédé d'impression avec un générateur de gouttelettes de liquide - Google Patents

Procédé d'impression avec un générateur de gouttelettes de liquide Download PDF

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Publication number
EP4338969A1
EP4338969A1 EP22195947.1A EP22195947A EP4338969A1 EP 4338969 A1 EP4338969 A1 EP 4338969A1 EP 22195947 A EP22195947 A EP 22195947A EP 4338969 A1 EP4338969 A1 EP 4338969A1
Authority
EP
European Patent Office
Prior art keywords
inlet
liquid
nozzles
zone
printmask
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.)
Pending
Application number
EP22195947.1A
Other languages
German (de)
English (en)
Inventor
Wout Verbeek
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.)
Agfa NV
Original Assignee
Agfa NV
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 Agfa NV filed Critical Agfa NV
Priority to EP22195947.1A priority Critical patent/EP4338969A1/fr
Priority to PCT/EP2023/068300 priority patent/WO2024056230A1/fr
Publication of EP4338969A1 publication Critical patent/EP4338969A1/fr
Pending legal-status Critical Current

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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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • 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
    • B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • 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
    • B41J2/1707—Conditioning of the inside of ink supply circuits, e.g. flushing during start-up or shut-down
    • 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
    • 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
    • B41J2/195—Ink jet characterised by ink handling for monitoring ink quality
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
    • B41J2/2117—Ejecting white liquids

Definitions

  • the present invention relates to image formation by a liquid droplet generator wherein image quality issues due to liquid-sedimentation in the manifold of the liquid droplet generator are avoided.
  • Image formation is a procedure whereby a digital image is printed on a medium e.g. by jetting droplets of liquid or another type of print fluid onto said medium, such as paper, plastic, a substrate for 3D printing.
  • Said image formation is commonly employed in apparatuses, such as printers (e.g. inkjet printer) but also facsimile machines, copying machines, plotting machines, multifunction peripherals, etc.
  • the core of a typical jetting apparatus or image forming apparatus is one or more liquid droplet generators (also known as "printheads") having nozzles that discharge liquid droplets, a mechanism for moving the liquid droplet generator and/or the medium in relation to one another, and a controller that controls how liquid is discharged from the individual nozzles of the liquid droplet generator onto the medium in the form of pixels.
  • a typical liquid droplet generator includes a plurality of nozzles aligned in one or more rows (called “nozzlerows”) along a discharge surface of the liquid droplet generator.
  • Each nozzle is part of a “jetting channel", which includes the nozzle, a pressure chamber, and an actuator, such as a piezoelectric actuator.
  • a liquid droplet generator also includes a drive circuit that controls when each individual jetting channel fires based on image data. To jet from a jetting channel, the drive circuit provides a jetting pulse to the actuator, which causes the actuator to deform a wall of the pressure chamber. The deformation of the pressure chamber creates pressure waves within the pressure chamber that eject a droplet of print fluid (e.g., liquid) out of the nozzle.
  • print fluid e.g., liquid
  • Drop on Demand (DoD) printing is moving towards higher productivity and quality, which requires small droplet sizes ejected at high jetting frequencies.
  • the print quality delivered by a liquid droplet generator depends on ejection or jetting characteristics, such as droplet velocity, droplet mass (or volume/diameter), jetting direction, etc.
  • ejection or jetting characteristics such as droplet velocity, droplet mass (or volume/diameter), jetting direction, etc.
  • liquid-sedimentation inside the liquid droplet generator especially in the manifold, negatively affects the jetting characteristics and thus the image quality especially when said liquid droplet generator has a manifold with two inlets at both sides of said manifold.
  • the liquid-sedimentation in the manifold occurs e.g. when said liquid droplet generator, filled with liquid, is not used for a long period.
  • EP 2157163 A discloses a maintenance liquid for inkjet printers comprising at least one of glycol ethers and glycol esters and 45 to 10 mg/L of dissolved oxygen.
  • EP 1621348 A discloses a washing solution for washing a cationically UV curable inkjet ink inkjet printer head, which contains not less than 50 parts by weight of a polymerizable compound selected from the at least two kinds of polymerizable compounds included in the ink and having the lowest viscosity among the at least two kinds of polymerizable compounds, or not less than 50 parts by weight of a polymerizable compound having a viscosity of 30 mPa.s or less at ordinary temperature.
  • the liquid droplet generator (100) in the present embodiment and preferred embodiments has one or more rows of nozzles for jetting droplets of liquid, also called drop-on-demand printheads. Preferably said drop ejection is performed by using piezoelectric effects.
  • Such printheads are nowadays dominating in home and office inkjet print systems but also in industrial applications for either printing or digital fabrication.
  • actuation mechanisms are possible such as push-mode actuators or squeeze-mode actuators.
  • the liquid droplet generator (100) in the present embodiment has an essential manifold elongated in parallel to a nozzle row; and configured to provide a liquid path for the liquid to the plurality of nozzles.
  • the liquid is provided by a first inlet (516) and a second inlet (517) which are connected with said manifold each at both side of said manifold.
  • no outlet is provided as known in reflow liquid droplet generators.
  • the speed flow of the liquid at both inlets determines the liquid flow in said manifold.
  • the speed flow in the first inlet (516) and second inlet (517) are the same.
  • the liquid droplet generator (100) may have a master liquid inlet which is split in said first inlet (516) and said second inlet (517). The liquid supply is then connected to said master liquid inlet where from the liquid is further provided in said liquid droplet generator (100) via said first and second inlet (516, 517).
  • the liquid-sedimentation in the manifold can be displaced whereby the liquid droplet generator (100) can directly be used for printing without the necessary maintenance so an operator can directly start the production of printed articles.
  • the droplet generator is part of a multi-pass inkjet printer wherein the halftone image is printed in multiple passes and the part is jetted in a single pass.
  • the printmask (1000) defines then the jetting of nozzles in each pass.
  • the determined part of the halftone image is additional printed by another plurality of nozzles, arranged in one or more rows, of the liquid droplet generator (100), where the liquid droplet generator (100) has at a third location in another manifold a liquid-sedimentation with highest density and wherein the other manifold is
  • the liquid droplet generator (100) is preferably part of a printing system, such as an inkjet printer.
  • the printing system is preferably for printing on flat ink receiving media but may also be a three-dimensional printing system.
  • an image is formed by one or more of said liquid droplet generators which are capable of printing one ink or more inks.
  • the printing system is preferably configured to move the liquid droplet generator (100) for printing parts of an image, such as multi-pass inkjet printing system.
  • a multi-pass inkjet printing method is used in the Jeti Tauro TM manufactured by AGFA NV with a maximum printable width of 254 cm and which can accommodate for example rigid media up to 400 cm in length.
  • the printing system may also be hybrid printing device wherein conventional printing technologies and liquid droplet technology are combined in a printing system.
  • printmasks are well known in the technical field of printing with liquid jetting technology, mainly in multi-pass inkjet printing technology.
  • Print masks are stored in a memory of the printing system, e.g. in a hardware or software printer driver, and control the signals applied to liquid droplet generator (100).
  • the actual implementation of the print mask in either hardware or software formats is considered to be within the skill of those who have knowledge of the inkjet printer arts, when this skill is applied in view of the teachings herein.
  • the printmask (1000) in the present embodiment has a width and height, so called two-dimensional printmask (1000).
  • the width and height are larger than 1.
  • the number of sequential zones may be 3, 4, 5, 6, 7, 8, 9 or 10 or equal to the width of the printmask (1000) or number of nozzles.
  • the printmask (1000) represents a blue noise halftoned gradient from nearest nozzle of the plurality of nozzles at the first inlet (516) to nearest nozzle of the plurality of nozzles at the second inlet (517); respectively from dark to light.
  • the printmask (1000) divides for another selected printing period following the selected printing period the plurality of nozzles in other sequential zones between the first inlet (516) and second inlet (517) comprising minimal for printing the determined part:
  • the part is determined by using a printmask (1000) which divides for a determined printing period the plurality of nozzles in sequential zones between said first and second inlet (516, 517) comprising minimal
  • the liquid is preferably an ink but it may also be a varnish, primer, a coating, a cleaning liquid, a top-protection coating, pre-treatment liquid, post-treatment liquid.
  • Liquid sedimentation results in clogging of the liquid droplet generator (100) and poor storage stability of the liquid. They are mainly some particles of the liquid having a specific gravity between said particles and the liquid medium.
  • the liquid is preferably pigmented inkjet inks as the use of colour pigments provide higher light stability to the decorative laminate panels than dyes. It may be a pigmented aqueous inkjet ink or an UV curable inkjet ink. Said pigments are mainly found in said liquid sedimentation.
  • An aqueous inkjet ink preferably includes at least a colour pigment and water, more preferably completed with one or more organic solvents such as humectants, and a dispersant if the colour pigment is not a selfdispersible colour pigment.
  • An UV curable inkjet ink preferably includes at least a colour pigment, a polymeric dispersant, a photoinitiator and a polymerizable compound, such as a monomer or oligomer.
  • the jetting viscosity of the liquid is between 2 mPa.s and 50 mpA.s and the jetting temperature of the liquid is between 20°C and 85° C degrees.
  • the jetting viscosity is measured by measuring the viscosity of the liquid at the jetting temperature.
  • the jetting viscosity may be measured with various types of viscometers such as a Brookfield DV-II+ viscometer at jetting temperature and at 12 rotations per minute (RPM) using a CPE 40 spindle which corresponds to a shear rate of 90 s -1 or with the HAAKE Rotovisco 1 Rheometer with sensor C60/1 Ti at a shear rate of 1000 s -1 .
  • the jetting viscosity is from 10 mPa ⁇ s to 200 mPa ⁇ s more preferably from 25 mPa s to 100 mPa ⁇ s and most preferably from 30 mPa ⁇ s to 70 mPa ⁇ s.
  • the jetting temperature may be measured with various types of thermometers.
  • the jetting temperature of jetted liquid is measured at the exit of a nozzle in the liquid droplet generator (100) while jetting or it may be measured by measuring the temperature of the liquid in the liquid channels or nozzle while jetting through the nozzle.
  • the jetting temperature is from 10° C to 100° C more preferably from 20° C to 60° C and most preferably from 30° C to 50° C.
  • the liquid has preferably a pigment an average particle size larger than 100 nm more preferably 200 nm or has a pigment in an amount of more than 16 wt% based on the total weight of the liquid.
  • a pigment is preferably an inorganic pigment and most preferably a white pigment as colorant.
  • the determination of the numeric average particle diameter is best performed by photon correlation spectroscopy at a wavelength of 633 nm with a 4mW HeNe laser on a diluted sample of the pigmented inkjet ink.
  • a suitable particle size analyzer used was a Malvern TM nano-S available from Goffin-Meyvis.
  • a sample can, for example, be prepared by addition of one drop of ink to a cuvette containing 1.5 mL ethyl acetate and mixed until a homogenous sample was obtained.
  • the measured particle size is the average value of 3 consecutive measurements consisting of 6 runs of 20 seconds.
  • a white pigment preferably has a numeric average pigment particle size larger than 180 nm in order to have a strong opacifying capability.
  • Suitable white pigments are given by Table 2 in [0116] of WO 2008/074548 (AGFA GRAPHICS ).
  • the white pigment is preferably a pigment with a refractive index greater than 1.60.
  • the white pigments may be employed singly or in combination.
  • titanium dioxide is used as pigment with a refractive index greater than 1.60.
  • Suitable titanium dioxide pigments are those disclosed in [0117] and in [0118] of WO 2008/074548 (AGFA GRAPHICS ).
  • the liquid is an UV curable based pigmented inkjet ink
  • the liquid has to be cured by ultraviolet radiation.
  • An UV curing device may be arranged in combination with the liquid droplet generator (100), travelling therewith so that the UV curable inkjet ink is exposed to curing radiation very shortly after been jetted. This method of curing is called 'UV-pinning' and helps to provide a high image quality, such as high sharpness. UV-pinning is often followed by a final UV curing step, when the UV dose in UV-pinning is insufficient to obtain full cure.
  • any ultraviolet light source as long as part of the emitted light can be absorbed by the photo-initiator or photo-initiator system, may be employed as a radiation source, such as, a high or low pressure mercury lamp, a cold cathode tube, a black light, an ultraviolet LED, an ultraviolet laser, and a flash light.
  • the preferred source is one exhibiting a relatively long wavelength UV-contribution having a dominant wavelength of 300-400 nm.
  • a UV-A light source is preferred due to the reduced light scattering therewith resulting in more efficient interior curing.
  • the UV curing and especially UV-pinning is preferably performed using UV LEDs.
  • the UV curing is performed using UV LEDs having an emission wavelength higher than 370 nm.
  • UV LEDs have a long life-time and an almost constant UV dose until the end of life, contrary to e.g. mercury bulbs.
  • the inkjet printer may include one or more oxygen depletion units.
  • the oxygen depletion units place a blanket of nitrogen or other relatively inert gas (e.g. CO 2 ), with adjustable position and adjustable inert gas concentration, in order to reduce the oxygen concentration in the curing environment. Residual oxygen levels may be maintained as low as 200 ppm, but are generally in the range of 200 ppm to 1200 ppm.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
EP22195947.1A 2022-09-15 2022-09-15 Procédé d'impression avec un générateur de gouttelettes de liquide Pending EP4338969A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22195947.1A EP4338969A1 (fr) 2022-09-15 2022-09-15 Procédé d'impression avec un générateur de gouttelettes de liquide
PCT/EP2023/068300 WO2024056230A1 (fr) 2022-09-15 2023-07-04 Procédé d'impression avec un générateur de gouttelettes de liquide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22195947.1A EP4338969A1 (fr) 2022-09-15 2022-09-15 Procédé d'impression avec un générateur de gouttelettes de liquide

Publications (1)

Publication Number Publication Date
EP4338969A1 true EP4338969A1 (fr) 2024-03-20

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EP22195947.1A Pending EP4338969A1 (fr) 2022-09-15 2022-09-15 Procédé d'impression avec un générateur de gouttelettes de liquide

Country Status (2)

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EP (1) EP4338969A1 (fr)
WO (1) WO2024056230A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4908638A (en) * 1988-12-15 1990-03-13 Xerox Corporation Ink jet marking head having multicolor capability
EP1621348A1 (fr) 2004-07-22 2006-02-01 Toshiba Tec Kabushiki Kaisha Solution de lavage pour une tête imprimante à jet d'encre et procédé de lavage utilisant la solution
WO2008074548A1 (fr) 2006-12-21 2008-06-26 Agfa Graphics Nv Encre blanche pour impression à jet d'encre améliorée pour la stabilité de dispersion
EP2157163A1 (fr) 2007-04-25 2010-02-24 Toyo Ink Mfg. Co. Ltd. Liquide d'entretien pour imprimante à jet d'encre
US20150306872A1 (en) * 2014-04-24 2015-10-29 Seiko Epson Corporation Liquid discharging apparatus and liquid discharge method
US20170253025A1 (en) * 2016-03-01 2017-09-07 Seiko Epson Corporation Droplet ejection control apparatus, droplet ejection control method, and droplet ejection control program
EP3536508A1 (fr) 2018-03-06 2019-09-11 Ricoh Company, Ltd. Tête d'impression

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4908638A (en) * 1988-12-15 1990-03-13 Xerox Corporation Ink jet marking head having multicolor capability
EP1621348A1 (fr) 2004-07-22 2006-02-01 Toshiba Tec Kabushiki Kaisha Solution de lavage pour une tête imprimante à jet d'encre et procédé de lavage utilisant la solution
WO2008074548A1 (fr) 2006-12-21 2008-06-26 Agfa Graphics Nv Encre blanche pour impression à jet d'encre améliorée pour la stabilité de dispersion
EP2157163A1 (fr) 2007-04-25 2010-02-24 Toyo Ink Mfg. Co. Ltd. Liquide d'entretien pour imprimante à jet d'encre
US20150306872A1 (en) * 2014-04-24 2015-10-29 Seiko Epson Corporation Liquid discharging apparatus and liquid discharge method
US20170253025A1 (en) * 2016-03-01 2017-09-07 Seiko Epson Corporation Droplet ejection control apparatus, droplet ejection control method, and droplet ejection control program
EP3536508A1 (fr) 2018-03-06 2019-09-11 Ricoh Company, Ltd. Tête d'impression

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Publication number Publication date
WO2024056230A1 (fr) 2024-03-21

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