EP2011656A1 - Production et déviation de gouttes de colorant de tailles variables - Google Patents

Production et déviation de gouttes de colorant de tailles variables Download PDF

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Publication number
EP2011656A1
EP2011656A1 EP08012220A EP08012220A EP2011656A1 EP 2011656 A1 EP2011656 A1 EP 2011656A1 EP 08012220 A EP08012220 A EP 08012220A EP 08012220 A EP08012220 A EP 08012220A EP 2011656 A1 EP2011656 A1 EP 2011656A1
Authority
EP
European Patent Office
Prior art keywords
sound
ink jet
ink
pulse
drops
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.)
Granted
Application number
EP08012220A
Other languages
German (de)
English (en)
Other versions
EP2011656B1 (fr
Inventor
Klaus Pechtl
Peter Schmitt
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.)
KBA Metronic GmbH
Original Assignee
KBA Metronic GmbH
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 KBA Metronic GmbH filed Critical KBA Metronic GmbH
Publication of EP2011656A1 publication Critical patent/EP2011656A1/fr
Application granted granted Critical
Publication of EP2011656B1 publication Critical patent/EP2011656B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/09—Deflection means
    • 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
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • 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
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
    • B41J2002/033—Continuous stream with droplets of different sizes

Definitions

  • the invention relates to a method for generating, in particular also for deflecting drops of ink of different sizes, in particular within a typeface of a continuous ink jet printer, wherein from a nozzle of a pressure chamber, a continuous contiguous ink jet emerges.
  • the invention further relates to a device for generating, in particular also for deflecting ink droplets of different sizes from a continuous ink jet, in particular within a typeface comprising a pressure chamber with a nozzle for generating a continuously emerging contiguous ink jet.
  • the nozzle in this case has an opening diameter in the range of eg 30 ⁇ to 200 ⁇ m. From the nozzle now the ink jet initially emerges as a continuous ink jet, which is impractical for a label, since the characters generated here are constructed in this type of labeling of individual dots or individual ink droplets.
  • a modulation element is mounted on the pressure chamber, which generates pressure fluctuations in the exiting ink jet, so that after leaving the nozzle after a short time at a defined distance breaks up into individual similar drops of ink.
  • the size of the ink drops depends on the applied modulation frequency, the nozzle diameter and the pressure generated by the pump, and can be set within the limits set by the combination of said parameters for the system. A variation of the droplet size of successive ink droplets is not possible.
  • the ink droplets are each provided with an individual electrical charge, the height of the charge depending on the desired impact position on the product to be labeled. To ensure electrical charging, the ink has a low electrical conductivity.
  • the ink droplet has not yet broken off from the ink jet emanating from the nozzle of the ink jet printer, so that due to electrical influence free charge carriers in the ink are moved towards or away from the charging electrode, depending on the polarity and magnitude of an external charging voltage Ink chamber and thus the ink reservoir, for example, electrically held at ground potential.
  • the charging electrode has no mechanical contact with the ink jet.
  • the ink droplet now tears off the ink jet while it is in the field region of the charging electrode, then the electrical charges migrated through the influence in the droplets remain in the drop volume and this appears to be electrically charged even after the demolition. If, for example, the charging electrode is charged positively, the negative free currents will migrate when the ink jet enters the electric field of the charging electrode Charge carriers in the ink into the field, whereas the positively charged free charge carriers in the ink are forced out of the electric field.
  • the electrically charged ink droplets subsequently enter the electrostatic field of a plate capacitor and, depending on their individual charge, are more or less deflected from their rectilinear trajectory and, upon leaving the electrostatic field, fly at a certain angle dependent on their charge continue to their original trajectory.
  • the ink droplets receive a certain fixed charge or remain uncharged, so that they meet after exiting the electrostatic field of the plate capacitor in a collection tube, from where they over Pump system be pumped back into the ink tank. This causes the unprinted ink to circulate, resulting in the designation of continuous ink jet printers.
  • a disadvantage of the described conventional design is that due to the systemic deflection of the ink droplets, the ink itself must have a low electrical conductivity, albeit low, so that the individual charge amount required for the electrostatic deflection can be applied to each individual ink droplet.
  • this may be an ink which has magnetic properties.
  • Such an ink could, for example, be rendered electrically conductive by means of an additive, but the trajectories of the respective ink droplets can not be controlled due to the induction phenomena that occur and the associated additional additional deflection forces.
  • the DE 103 07 055 in contrast, describes a method for deflecting ink drops, which deflects the ink drops generated in the usual way by pressure modulation in the ink by means of an ultrasonic wave depending on the applied sound energy to different degrees.
  • the drops are generated via the pressure chamber by means of a resonance process and Thus, at least at a certain frequency in each case have an equal size, so that a typeface with different weights only by an overlay of several drops of ink generated and thus only in stages can be generated.
  • a further disadvantage is that when using a simple sound generator due to the size of the sound-generating surface, the acting sound energy not only acts exclusively on the ink drops to be deflected but at least partially on vorausfer and subsequent drops, whereby a precise deflection of the ink drops is only partially possible.
  • the object of the invention is therefore to provide a method and a device with which it is possible to eliminate the disadvantages mentioned. It is also an object of the invention to provide a method and a device with which it is possible to produce differently sized ink droplets within an inscription to be applied and to precisely divert them into a desired direction of flight
  • the object is achieved according to the invention in that, in contrast to the known technique, the generation of individual ink droplets from a continuous and contiguous ink jet after leaving the ink jet from the nozzle of the pressure chamber takes place in that a series of sound pulses laterally meets the propagation direction on the contiguous ink jet, and with each sound pulse, a portion of the ink jet acted on by the sonic pulse is released from the contiguous ink jet and deflected from its original propagation direction, thereby disrupting the original ink jet and forming in the original propagation direction an ink jet from the remaining portions, the respective length thereof is selectable by the time interval between two successive sound pulses.
  • a device of the type mentioned in which at least one sound generator outside the pressure chamber and the side of the ink jet is arranged, with which a sequence of sound pulses can be generated, which laterally meet the direction of propagation to the contiguous ink jet, with each Sonic pulse, a portion of the ink jet, which is acted upon by the sound pulse from the contiguous ink jet and deflected from its original propagation direction, whereby the original ink jet is interrupted and in the original direction of propagation, an ink jet from the remaining sections is formed, their respective length of the time interval between two successive sound pulses depends.
  • the invention is based on the core idea that by means of a sound pulse, preferably a bundled ultrasonic pulse or hypersonic pulse, a coherent ink jet can be selectively and preferably repeatedly interrupted so that, depending on the time interval of the sound interruption pulses, different lengths of remaining ink jet sections can result continue their original trajectory.
  • a sound pulse preferably a bundled ultrasonic pulse or hypersonic pulse
  • At least one sound generator is arranged, which is controlled by a suitable electrical control via a higher-level control and in particular short sound pulses across Inkjet sends out.
  • the ink jet passes through the respective focal points, so that the sound energy of the sound pulses can act in the best possible way on the ink jet.
  • the contiguous ink jet is hit by at least one sound pulse at the focal point of a first sound generator, a certain portion of the ink jet is released by means of the energy transmitted to the ink jet via the sound pulse and the associated sound pulse, whereby the ink jet is interrupted.
  • the leached portion leaves the original trajectory of the ink jet and flies at a certain angle range to the original Fugbahn on and can be collected by means of a catcher and back into the ink cycle be transported.
  • the remaining ink jet sections thus produced due to the fragmentation of the original contiguous ink jet can have a different arbitrary or even the same length, depending on the time sequence of the interrupting sound pulses.
  • these remaining portions due to the internal cohesive forces of the ink, form into different sized drops of ink depending on the length of the sections.
  • the ink jet is subdivided by means of a first sound pulse train of a specific frequency into sections remaining the same length, which can each be subdivided into segments of different length by means of a second sound pulse.
  • a first sound pulse train of a specific frequency into sections remaining the same length, which can each be subdivided into segments of different length by means of a second sound pulse.
  • one or two ink droplets can be formed from the respective route sections, of which in each case one can be provided for printing, for example.
  • the respective other drops can be collected by means of a suitable collecting device and fed back to the ink circuit. This makes it possible in a simple manner to produce ink droplets of different sizes for a label.
  • the maximum size of an ink droplet generated from such a section depends essentially on the length of the defined section.
  • an external frequency can, for example, be provided by an external machine controller and, for example, depend on the web speed of a production machine.
  • the deflection of the ink droplets produced in this way can take place in a subsequent deflection device, for example, by deflecting the respective ink droplets intended for labeling by means of a second sound generator into specific deflecting directions by imparting thereto a deflection pulse by means of at least one sound pulse acting laterally on the respective droplet , which preferably acts perpendicular to its original momentum and the ink drops in a for original direction of propagation is deflected inclined new direction of movement.
  • the sound pulses may differ in terms of their duration, their energy, their frequency spectrum, their pulse shape or their focus, etc., whereby it is also possible to generate a deflection of a drop, for example by means of a plurality of sound pulses.
  • the possible trajectories of the deflected ink droplets can be fan-shaped relative to one another, for example, whereby a pressure line can be written in the case of a deflection in a transverse direction to the original trajectory.
  • Sound are used, such as electrodynamic transducers, piezoelectric transducers, electrostrictive transducers, magnetostrictive transducers, electrostatic transducers, plasma generators, etc. wherein at least a portion of the pulsed sound waves generated by the sound generator are focused into a focal point according to the invention.
  • an acoustic lens, a reflector material or a combination thereof can be used.
  • the sound generator and in particular a sound-generating surface in such a way that it acts, for example, as a Fourier-transformed at least one substantially punctiform sound event.
  • sound waves emanating from this surface can be concentrated essentially in one or more focal points.
  • the sound-generating surface in a simple case, for example, designed as a Fresnel zone plate, wherein the sound-generating surface is divided into individual concentrically regions each individually controllable electrically.
  • a corresponding embodiment of the sound-generating surface and a corresponding electrical control of the respective areas to produce a plurality of mutually independent acoustic foci, so as to divide the ink jet into corresponding sections and, for example, in a first focal point resulting from to divert the ink droplets formed in the respective sections individually.
  • FIG. 1 shows for comparison with the invention by way of example a printhead of the known type of continuous ink jet printer.
  • the ink 1 is first pumped from a reservoir 2 by means of a pump 3 via leads 4a into the pressure chamber 5, at one end of which a nozzle 6 is introduced.
  • the pressure in the pressure chamber 5 is modulated so that the ink jet 9 emerging from the nozzle 6 at a short distance to its exit into individual ink droplets 11 of substantially the same size breaks up.
  • the individual ink droplets 11 are provided with an individual electrical charge via a charging electrode 8.
  • the ink drops 11 now enter an electric field 21, which is formed by means of the electrodes 20a and 20b of the plate capacitor 20.
  • the individual ink droplets are deflected into different spatial directions 101, 102 shown by way of example.
  • the total number of possible deflection angles depends only on the control of the charging electrode and is not limited in principle.
  • the individual plates 20a and 20b of the plate capacitor 20 may be inclined relative to each other, as in FIG. 1 shown. However, it is also possible to use plates arranged parallel to one another without restriction of generality.
  • the polarity and strength of the electric field 21 is expediently kept substantially constant in this embodiment, since a change in the field strength to a plurality of drops, which are located in the field space of the plate capacitor at this time, simultaneously affects and thus an influence of a single drop is impossible.
  • FIG. 2 shows a schematic representation for the production of ink droplets of different sizes.
  • the continuous and contiguous ink jet 9 exiting the nozzle 6 of a pressure chamber 5 along a direction of propagation 100 passes through the focal point 42c of a first sound generator arrangement 40 which comprises, for example, a recording device 40d for a sound generator 40a and a focusing device 40b upstream of the sound generator 40a, whereby the means of the Sound generator 40a sound waves 140 are bundled into a focal point 42c.
  • a first sound generator arrangement 40 which comprises, for example, a recording device 40d for a sound generator 40a and a focusing device 40b upstream of the sound generator 40a, whereby the means of the Sound generator 40a sound waves 140 are bundled into a focal point 42c.
  • the ink portions 12, which are dissolved out at the interruption of the ink jet 9 and thereby learn about the sound pulse a specific deflection pulse are thereby deflected, for example in a deflection 110 and get into, for example, a collecting opening 19a of a collecting device 18a, as in the FIGS. 3 and 4 and can be transported back into the ink tank 2 via return lines 4c.
  • each section Sn-1, Sn, Sn + 1,... can be divided into two differently sized ink drops by means of said second sound pulses, it is still possible, for example for a label, only the drops Sbn-1, Sbn, Sbn + 1, ... to use for a label and to deflect accordingly by means of a downstream deflection device for generating a printing line.
  • the remaining ink drops San-1, San, San + 1, ... are not deflected thereby and, for example, enter the collecting opening 19 of a collecting device 18 and can be conveyed back into the ink tank 2 via return lines 4b.
  • ink sheets Sb having different volumes for lettering, whereby the minimum volume of an ink drop provided for the lettering may disappear and the maximum volume of an ink drop intended for a lettering may be equal to the volume of ink present in a section Sn.
  • FIG. 3 shows a schematic representation of a first embodiment of an ink jet print head according to the invention for the generation and Deflection of ink droplets of a not necessarily electrically conductive ink and in particular an electrically non-conductive ink.
  • the ink 1 is for this purpose pumped from a reservoir 2 by means of a pump 3 via leads 4a in a pressure chamber 5, at one end of which a nozzle 6 is located. Due to the substantially static pressure generated by the pump 3 in the pressure chamber 5, the ink 1 exits the pressure chamber 5 via the nozzle 6 as a continuous and contiguous ink jet 9 along a propagation direction 100 and after a certain distance enters the area of the sound generation system 40th
  • the sound generator system 40 comprises, for example, a sound generator 40a located in a holder 40d, which has a focusing device 40b on its side facing the ink jet 9.
  • the distance of the sound generator system 40 to the ink jet 9 and in particular the configuration of the focusing device 40b are determined such that the focal point of the focusing device 40b falls on the ink jet 9 moving along the propagation direction 100.
  • the sound pulses 140 emitted from the sound generator 40a are concentrated in a small area on the ink jet 9 so as to transmit to a certain area of the ink jet 9 a certain sound energy and a certain sound pulse, thereby dividing the continuous and contiguous ink jet 9 into certain sections Sn-1, Sn, Sn + 1, .. can be divided by each of a particular ink content is dissolved at the separation points.
  • Tropfenablenkvoriques 41 which for example also represents a working by means of sound pulses deflector (sound generator) determine the required for a particular deflection type of sound pulses in a higher-level control and the sound generator 41 a control accordingly.
  • the deflection device 41 comprises, for example, a sound generator 41a located in a recording device 41d, whose generated sound waves 141 are focused by means of a focusing device 41b into a focal point 41c.
  • the deflecting device 41 is arranged transversely to the direction of propagation 100 of the ink drops Sa, Sb such that the ink drops Sa, Sb each pass through the focal point 41c and can be deflected by means of sound pulses from their original direction 100 into a desired new direction 101, 102, 103.
  • Ink droplets not intended for printing are not deflected and reach, for example, the collecting opening 19 of a collecting device 18 and can be transported back into the ink tank 2 via a return line 4b. If, for example, only the generated ink drops Sb are used for printing, they experience a respective required movement pulse transversely to their original direction of movement 100 according to size and desired direction of deflection via a sound pulse acting on them, whereas the ink drops Sa experience no additional impulse and along the direction 100 enter the said collecting opening 19. As a result, it is possible, for one purpose, to divert ink droplets of different sizes into a desired direction in a targeted manner, and thus one out of individual pressure points different size existing label on a substrate to produce.
  • FIG. 4 shows a second embodiment of the invention for generating ink droplets and their deflection, in which the sound generator system 42 is designed to produce different sized ink droplets so that it can be operated as a Fourier transform a punctiform sound event.
  • the deflection of the differently sized ink droplets produced in this way can be carried out in a manner similar to that described above by means of a downstream deflection device 43, which can also be designed as a Fourier-transformed at least one point-shaped sound event.
  • a downstream deflection device 43 which can also be designed as a Fourier-transformed at least one point-shaped sound event.
  • the use of "Fourier transform" sound generators it is also possible, for example, to improve the transmission effect of Sound energy to the ink jet 9 or the ink droplets to be deflected the focal point 42c, 43c along the direction 100, for example by changing the phase angles and / or the amplitudes and / or the frequency spectra of the sound generating segments 42a to each other at least for the duration of the sound pulse carry.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
EP08012220A 2007-07-06 2008-07-07 Production et déviation de gouttes de colorant de tailles variables Not-in-force EP2011656B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007031659A DE102007031659A1 (de) 2007-07-06 2007-07-06 Erzeugung und Ablenkung von Tintentropfen variabler Größe

Publications (2)

Publication Number Publication Date
EP2011656A1 true EP2011656A1 (fr) 2009-01-07
EP2011656B1 EP2011656B1 (fr) 2009-11-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08012220A Not-in-force EP2011656B1 (fr) 2007-07-06 2008-07-07 Production et déviation de gouttes de colorant de tailles variables

Country Status (5)

Country Link
US (1) US20100097415A1 (fr)
EP (1) EP2011656B1 (fr)
CN (1) CN101391521A (fr)
AT (1) ATE447486T1 (fr)
DE (2) DE102007031659A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2989625B1 (fr) 2012-04-24 2015-12-25 Markem Imaje Impression d'un motif d'authentification avec une imprimante a jet d'encre continu devie
CN110884256A (zh) * 2019-11-26 2020-03-17 山东盈科杰数码科技有限公司 一种提高打印质量的喷墨方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190844A (en) * 1977-03-01 1980-02-26 International Standard Electric Corporation Ink-jet printer with pneumatic deflector
DE10307055A1 (de) 2003-02-20 2004-09-02 Rea Elektronik Gmbh Tintenstrahl-Druckverfahren und Vorrichtung hierfür
WO2006076195A2 (fr) * 2005-01-12 2006-07-20 Beckman Coulter, Inc. Procedes et appareil de tri hydraulique de particules

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595994A (en) * 1969-01-17 1971-07-27 Franklin M Whitman Facsimile printer-enlarger utilizing a displaceable marking stream
DE2913219A1 (de) * 1979-04-03 1980-10-23 Agfa Gevaert Ag Vorrichtung und verfahren zur aufzeichnung von informationen
US4620196A (en) * 1985-01-31 1986-10-28 Carl H. Hertz Method and apparatus for high resolution ink jet printing
US6364470B1 (en) * 1999-12-30 2002-04-02 Eastman Kodak Company Continuous ink jet printer with a notch deflector
US7288469B2 (en) * 2004-12-03 2007-10-30 Eastman Kodak Company Methods and apparatuses for forming an article

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190844A (en) * 1977-03-01 1980-02-26 International Standard Electric Corporation Ink-jet printer with pneumatic deflector
DE10307055A1 (de) 2003-02-20 2004-09-02 Rea Elektronik Gmbh Tintenstrahl-Druckverfahren und Vorrichtung hierfür
WO2006076195A2 (fr) * 2005-01-12 2006-07-20 Beckman Coulter, Inc. Procedes et appareil de tri hydraulique de particules

Also Published As

Publication number Publication date
DE502008000173D1 (de) 2009-12-17
EP2011656B1 (fr) 2009-11-04
US20100097415A1 (en) 2010-04-22
DE102007031659A1 (de) 2009-01-15
CN101391521A (zh) 2009-03-25
ATE447486T1 (de) 2009-11-15

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