EP3626455A1 - Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck - Google Patents

Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck Download PDF

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Publication number
EP3626455A1
EP3626455A1 EP18195808.3A EP18195808A EP3626455A1 EP 3626455 A1 EP3626455 A1 EP 3626455A1 EP 18195808 A EP18195808 A EP 18195808A EP 3626455 A1 EP3626455 A1 EP 3626455A1
Authority
EP
European Patent Office
Prior art keywords
liquid
droplet
nozzle
liquid chamber
electric actuator
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.)
Withdrawn
Application number
EP18195808.3A
Other languages
English (en)
French (fr)
Inventor
Arjan B. FRATERS
Marcus J. Van Den Berg
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.)
Canon Production Printing Holding BV
Original Assignee
Canon Production Printing Holding BV
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 Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Priority to EP18195808.3A priority Critical patent/EP3626455A1/de
Publication of EP3626455A1 publication Critical patent/EP3626455A1/de
Withdrawn legal-status Critical Current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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04516—Control methods or devices therefor, e.g. driver circuits, control circuits preventing formation of satellite drops
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on 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
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • 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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04591—Width of the driving signal being adjusted

Definitions

  • the invention relates to a method for driving a droplet jetting element comprising a piezo electric actuator in connection with a liquid chamber ending in a nozzle, the piezo electric actuator being capable of shaping a volume of the liquid chamber upon application of an electric voltage to the electrodes of the actuator, the method comprising the steps of: filling the liquid chamber with a liquid that is capable of being ejected in droplets from the nozzle and applying a driving waveform to the piezo electric actuator, wherein the driving waveform comprises a part for discharging a droplet from the nozzle, shortly followed by a part for preventing a primary satellite droplet.
  • a a droplet of a liquid may be discharged from a nozzle of a liquid chamber by shaping the volume of the chamber on a timescale comparable to the Helmholtz resonance frequency of the liquid geometry.
  • the chamber is first expanded to draw liquid, such as ink, into the chamber. This expanded state is maintained for a short time and then the chamber is contracted for pushing the liquid out of the chamber in a fill-before-fire driving method.
  • the mechanisms that play a role in the behaviour of the liquid and the formation of droplets are the subject of extensive academic and applied research.
  • the viscosity of the liquid which is strongly dependent on the liquid temperature, is an important parameter in this behaviour.
  • An analysis of the liquid being pushed out of the nozzle of the liquid chamber shows that the liquid initially comes out as a string that breaks up while being separated from a meniscus in or outside the nozzle.
  • a principal droplet materializes, followed by a tail, in which a primary tail, a secondary tail and sometimes even a tertiary tail can be discerned.
  • This analysis involves stroboscopic laser-induced fluorescence microscopy to image the fluid tail dynamics at nanoseconds temporal resolution.
  • the different tails break up into different droplets, called satellites.
  • the primary satellites, stemming from the primary tail are droplets that mainly follow the path of the principal droplet and may or may not merge with this droplet, depending on their relative speed.
  • the secondary (and tertiary) satellites stemming from the secondary (and tertiary) tail, are droplets that are usually so small that they quickly lose their speed and are carried away by residual airflow. Their behaviour is comparable to mist. Whereas the primary satellites may disturb the pattern created by the principal droplets, especially when the jetting device is moving relative to a substrate that receives the droplets, as is quite commonly the case, the further satellites mainly cause pollution of the device wherein the droplet jetting element is operated.
  • the primary satellite is sufficiently suppressed by application of the above-mentioned waveform, but secondary satellites are still abundantly present.
  • the device wherein the droplet jetting element is operated is profusely polluted by the material that is supposed to be jetted in droplets towards a receiving surface.
  • the method according to the invention comprises a waveform wherein the second part comprises a variable retention timing to reduce an amount of liquid in a secondary satellite droplet.
  • the present invention may also be embodied in a jetting device.
  • the jetting element that is used has a piezo-electric actuator in connection with a liquid chamber ending in a cylindrical nozzle with a diameter of 14 ⁇ m and a length of 10 ⁇ m. Droplets with an approximate volume of 1 pico-liter (about 12 ⁇ m diameter) are produced at a velocity of 6.8 m/s as measured at a distance of 0.5 mm from the nozzle.
  • the liquid jetted from the element is Iso Bornyl Acrylate, which is a single component liquid with a viscosity and surface tension similar to more complex inks that are used in commercial inkjet printing. Resistive heating elements and temperature sensors are incorporated to accurately control and monitor the liquid temperature.
  • Fig. 1 a characteristic shape of the waveform to be applied for a droplet jetting element.
  • the waveform is given as a voltage 2 along the vertical axis as a function of time 1 along the horizontal axis.
  • the total time of the waveform 3 is in the order of 8 to 12 ⁇ s.
  • the waveform comprises two parts: a first part 4, comprising an expansion element 6, a retention element 7 and a contraction element 8, has the effect of drawing the liquid into the liquid chamber, waiting for the acoustic wave to propagate and pushing liquid out of the nozzle of the chamber to generate a principal droplet.
  • a short retention time 9 later a second part 5 of the waveform tries to keep the liquid that is not part of the principal droplet inside the liquid chamber and to restore an initial condition.
  • This second part 5 comprises an re-expansion element 10, a retention element 11, a first re-contraction element 12, a retention element 13 and a second re-contraction element 14.
  • the base line 15 indicates the voltage of the initial
  • the dashed curve 20 indicates a waveform that gives a different, lower amount of material in secondary satellites that usually end up as pollution around the device comprising the jetting element.
  • the total time 3' of this waveform is substantially longer.
  • the retention time 11 may need to be varied to obtain a minimum of secondary satellites.
  • the length of this timing is indicated by the arrow 25.
  • Fig. 2 shows a part of the liquid string 50 coming out of the nozzle of the jetting element at a fixed time. On top the meniscus 51 coming out of the nozzle is visible. Out of the meniscus a secondary tail 52 can be discerned. A transition 53 marks the boundary between the primary tail 54 and the secondary tail 52. The waveform is designed to keep the various tails as short as possible. An amount of material can be estimated from images such as shown in this Fig. 2 .
  • Fig. 3 shows an amount of material in the secondary tail along the vertical axis 61 in units of femto-liter, as a function of the variable timing 25 in units of micro-seconds along the horizontal axis 60.
  • a first curve 62 is at a slightly higher temperature, meaning a slightly lower viscosity than a second curve 63. Both curves show that a minimum can be found by varying the timing 25 for starting the re-contraction of the liquid chamber.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP18195808.3A 2018-09-20 2018-09-20 Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck Withdrawn EP3626455A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18195808.3A EP3626455A1 (de) 2018-09-20 2018-09-20 Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18195808.3A EP3626455A1 (de) 2018-09-20 2018-09-20 Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck

Publications (1)

Publication Number Publication Date
EP3626455A1 true EP3626455A1 (de) 2020-03-25

Family

ID=63667827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18195808.3A Withdrawn EP3626455A1 (de) 2018-09-20 2018-09-20 Verfahren zur verminderung von sekundären satelliten im tintenstrahldruck

Country Status (1)

Country Link
EP (1) EP3626455A1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738600A2 (de) * 1995-04-20 1996-10-23 Seiko Epson Corporation Tintenstrahlkopf, Tintenstrahlaufzeichnungsvorrichtung und Steuerverfahren
US20070002091A1 (en) * 2005-07-01 2007-01-04 Hitoshi Kida Method of Ejecting Microdroplets of Ink
US20070046704A1 (en) * 2005-08-25 2007-03-01 Fuji Xerox Co. Ltd. Droplet ejecting apparatus and droplet ejecting method
US20100182363A1 (en) 2009-01-22 2010-07-22 Seiko Epson Corporation Liquid discharging apparatus and control method thereof
JP2013248750A (ja) * 2012-05-30 2013-12-12 Seiko Epson Corp 液体噴射装置、および、液体噴射装置の制御方法
US20140160193A1 (en) * 2012-12-07 2014-06-12 Ricoh Company, Ltd. Droplet ejecting apparatus and method for driving the same
US20180111369A1 (en) * 2015-06-29 2018-04-26 Océ-Technologies B.V. Electronic circuit for driving an array of inkjet print elements

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738600A2 (de) * 1995-04-20 1996-10-23 Seiko Epson Corporation Tintenstrahlkopf, Tintenstrahlaufzeichnungsvorrichtung und Steuerverfahren
US20070002091A1 (en) * 2005-07-01 2007-01-04 Hitoshi Kida Method of Ejecting Microdroplets of Ink
US20070046704A1 (en) * 2005-08-25 2007-03-01 Fuji Xerox Co. Ltd. Droplet ejecting apparatus and droplet ejecting method
US20100182363A1 (en) 2009-01-22 2010-07-22 Seiko Epson Corporation Liquid discharging apparatus and control method thereof
JP2013248750A (ja) * 2012-05-30 2013-12-12 Seiko Epson Corp 液体噴射装置、および、液体噴射装置の制御方法
US20140160193A1 (en) * 2012-12-07 2014-06-12 Ricoh Company, Ltd. Droplet ejecting apparatus and method for driving the same
US20180111369A1 (en) * 2015-06-29 2018-04-26 Océ-Technologies B.V. Electronic circuit for driving an array of inkjet print elements

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