EP2758243B1 - Verfahren und vorrichtung zur gewinnung homogener tinte für inkjet-geräte - Google Patents

Verfahren und vorrichtung zur gewinnung homogener tinte für inkjet-geräte Download PDF

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Publication number
EP2758243B1
EP2758243B1 EP12768760.6A EP12768760A EP2758243B1 EP 2758243 B1 EP2758243 B1 EP 2758243B1 EP 12768760 A EP12768760 A EP 12768760A EP 2758243 B1 EP2758243 B1 EP 2758243B1
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EP
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Prior art keywords
ink
ink droplets
droplets
homogenization
droplet catcher
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EP12768760.6A
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German (de)
English (en)
French (fr)
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EP2758243A1 (de
Inventor
Bernhard Heuft
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Simaco GmbH
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Simaco GmbH
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    • 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 a method and a device for obtaining homogeneous ink for inkjet devices, comprising an apparatus for generating an ink jet, with a nozzle assembly comprising an ultrasonic transducer and a nozzle for separating the ink jet into individual ink drops of the same size, with a charging tunnel in which at least a part of the ink droplets is provided with an electrical charge, with a deflector, with which the individual electrically charged ink droplets are deflected, and with a homogenizing drip.
  • an ink jet 12 (see FIG. 1 ) with pressure via a nozzle from the print head 10.
  • This beam 12 is modulated via a piezoelectric transducer located behind the nozzle, so that a uniform decay into individual drops 16 is achieved (Rayleigh drip decay).
  • the detaching droplets 16 are more or less electrostatically charged.
  • the 10 to 40 m / s fast drops 16 then fly through a larger deflection electrode 20, where they are deflected by different, specific electrical charge states laterally or in height.
  • the charged or uncharged drops 16 now reach the surface 21 to be printed.
  • Unnecessary drops 16 are already deflected at the print head into a conventional drip catcher 22, collected and returned to the ink circulation system. It is off EP 0 362 101 It is known to test and control the speed of the droplets, the quality of the ink and the formation and charging of the droplets in order to achieve a high print quality.
  • the jet-drop stream is deflected as it passes through a static deflection electric field.
  • the catcher is positioned directly opposite the deflection electrode and picks up droplets in the catching tracks while allowing the drops in the pressure paths to strike the pressure medium.
  • DE-OS 23 31 803 For example, an ink jet matrix printer (CIJ printer) with two ink traps is known.
  • the first ink catcher plate generates control signals for the synchronization of the drop formation and the Charging the drops.
  • the second ink catcher retains droplets unused at test intervals, which have a very high charge compared to the drops used for printing, thereby detecting system errors such as deflection voltage or character height errors.
  • JP 56113463 A For example, a two-part drip for a CIJ printer is described which captures undeflected drops and drops charged opposite to the drops used for writing. These oppositely charged drops are used to determine ink viscosity.
  • CIJ printers use special inks. These inks are composed of dyes, binders and solvents. As needed, additional salts, quaternary ammonium compounds or other means may be included to increase the conductivity of the ink. In addition, adhesion promoters, as well as agents for increasing or decreasing the surface tension may be included. In addition to dyes, pigments can also be used to color the ink. While dye inks produce more brilliant colors by comparison, pigment inks have the advantage of having less running on the surface to be printed and showing higher fastness and higher contrast.
  • the ink is as homogeneous as possible in order to form ink droplets that are as uniform as possible.
  • the ink droplets are said to have consistent teardrop-tear length, drop velocity, mass, and electrical chargeability.
  • the homogeneity of the ink is a prerequisite for the ink jet to be separated into small droplets with constant chemical and physical properties.
  • the loading capacity in relation to the weight is crucial, because only if the droplets have a certain charge / mass ratio, they can be directed to their intended place in the writing matrix.
  • a non-uniform droplet formation therefore leads to poorly controllable or vagabond ink droplets, the one Deterioration of the typeface of the printhead result.
  • inks with as high a degree of homogenization as possible, care is taken to ensure that the individual components of the ink have the highest possible solubility and dispersibility, and process engineering paths are selected which result in the highest possible homogeneity of the ink.
  • the ink is filtered several times during manufacture. In addition, so far the ink is exactly matched to the device in which the ink is to be used ( EP 0 438 427 ).
  • the object of the present invention is therefore to provide a method and a device with the aid of which a cleaner typeface is achieved in CIJ printing.
  • each ink droplet is provided with the same electrical charge.
  • each ink droplet is meant only the ink droplets used to obtain the homogeneous ink for inkjet devices. The necessary for the phasing ink droplets are loaded only slightly in the inventive method and are not meant.
  • the method according to the invention can also be combined with a CIJ printing process in such a way that ink droplets which are not required for printing and phasing are used to obtain homogeneous ink. "Each droplet of ink” therefore refers only to these last-mentioned ink droplets.
  • the flight length of the ink droplets used to obtain the homogeneous ink is greater than that in CIJ printing.
  • the flight length is preferably more than 50 mm, in particular more than 70 mm. The longer the flight path of the ink droplets and the greater the deflection, the closer the particle size fraction of the ink droplets collected by the homogenizing drip and the more homogeneous the recovered ink.
  • the ink droplets collected by the homogenizing drip are stored in an intermediate container.
  • the ink droplets are deflected more strongly than in CIJ printing, so that inhomogeneities of the ink droplets have a particularly pronounced effect.
  • the deflector generates an electrostatic or a magnetostatic field for deflecting the ink droplets.
  • the apparatus includes an intermediate container for storing the ink droplets collected by the homogenizing drip.
  • the device may be useful for both obtaining homogeneous ink and printing a surface with the homogeneous ink. It has for this purpose a device for holding and guiding a substrate with a surface to be printed and a drip which is arranged so that it collects the undeflected and not required for printing ink droplets.
  • the means for holding and guiding the substrate with the surface to be printed and the homogenizing drip are preferably arranged on opposite sides of the droplet for the undeflected ink droplets.
  • the means for holding and guiding the substrate with the surface to be printed over the droplet for the undeflected ink droplets can be arranged and the homogenization drip can be arranged under the droplet for the undeflected ink droplets.
  • the homogenizer according to the invention has substantially the same structure as a conventional inkjet printhead, with only a homogenizing drip is provided outside the undeflected trajectory, so that only those ink droplets are collected, which were deflected by a corresponding amount.
  • the inkjet printhead can be one for multi-deflection CIJ printing or one for binary CIJ printing.
  • Multi-Deflection CIJ printing uses a Printhead with a single nozzle orifice produces a series of individual ink droplets and the location at which an ink droplet impinges on the surface to be printed is controlled by the amount of deflection, which in turn is controlled by the charging of the droplet.
  • a plurality of ink jets ie, series of ink droplets
  • a plurality of printheads such as 192 or 256
  • the location where an ink droplet impinges on the surface to be imprinted is determined. determined by the position of the corresponding nozzle opening on the printhead, wherein all ink droplets receive either no or the same electrical charge, depending on whether a character or a space is to be printed.
  • a raw ink which has approximately the required properties in terms of viscosity and conductivity.
  • an ink jet is generated, which is divided by means of an ultrasonic transducer and a nozzle into individual equal droplets.
  • a charge device provides the ink jet with a charge so that any droplets that come off the ink jet have a charge.
  • a deflector deflects the charged droplets from their original trajectory and delivers the ink droplets to the homogenizer drip. Only the drops whose deflection corresponds to the position of the homogenization drip are picked up by the homogenization drip and forwarded to an intermediate reservoir.
  • Drops that experience a deviation other than the predetermined value due to inhomogeneities or contamination of the ink do not impinge on the homogenization drip and are not transferred to the surge tank, thus providing an effective separation between homogeneous and inhomogeneous inventory parts of the ink can be brought about.
  • the intermediate container only drops accumulate, which are optimally formed and almost no inhomogeneities or impurities. So you get an ink that has broken down into drops high linearity and repeatability and thus shows a very clean typeface.
  • Ink droplets that are not picked up by the homogenizer drip hit a baffle plate from which they drip off and can be collected in a separate sump.
  • the baffle plate is preferably arranged in the direction of flight of the droplets behind the homogenization drip. The ink collected in the sump can be recycled and returned to the homogenizer.
  • the homogenization process according to the invention like the CIJ printing process, is adjusted at short intervals of a few seconds in order to compensate for temperature fluctuations, pressure changes and changes in similar operating parameters and to perform a phasing. After each adjustment, the homogenization process is resumed and it is necessary to wait until the equilibrium is restored. Due to the frequent interruptions, in particular the slipstream effect which occurs when resuming the homogenization process has a disturbing effect.
  • the charge of the individual ink droplets can also be determined empirically and controlled as a function of the number of ink droplets in advance. The charge of the ink droplets is successively reduced until the trajectory of the ink droplets has stabilized. Although no ink droplets are lost in this way, an additional non-linear control is required, which makes both operation and maintenance of the device more complicated.
  • Another alternative is that alternately very highly charged and not or only slightly charged ink droplets are generated.
  • the distance between the individual highly charged ink droplets is so great that they no longer influence each other.
  • only every third, fourth, etc. ink droplet can be charged very high.
  • the yield is also greatly reduced in this method, the highest and most stable selectivity can be achieved.
  • the only slightly charged droplets can be used for phasing.
  • ink droplets it is also possible to charge the ink droplets alternately with charge of different polarization.
  • the ink droplets are then deflected alternately upwards and downwards (in the geometry of the figures), so that again no mutual Influencing the trajectories of successive ink droplets occurs.
  • another homogenization drip must be provided, which receives the reverse polarized ink droplets.
  • the individual methods for avoiding the mutual influence of the trajectories of the ink droplets can also be combined with each other for optimization.
  • the degree of deflection of the charged ink droplets depends on their charge / mass ratio.
  • the selection of the charge / mass ratio can be adjusted via the position of the homogenizing drip, the ink pressure, the charging voltage, the deflection voltage, as well as the distance of the homogenizing drip from the charging tunnel.
  • the selectivity of the homogenizer can be determined by the distance between the loading tunnel and the Homogenmaschinestropfenfnatureer, as well as the strength of the deflection field.
  • the actual charge applied to an ink droplet depends on the conductivity of the ink between the exit nozzle and the break-off point. Changes in the conductivity of the ink in this area lead to different charge of the ink droplets.
  • the location of the breakpoint depends on the speed or the pressure of the ink, as well as the drive voltage of the nozzle. Locally occurring changes in viscosity or surface tension caused by inhomogeneities of the ink lead to changes in the tear-off length and thus to a change in the charge of the ink droplets concerned.
  • the deflection field may be an electrostatic field generated by one or more high voltage electrodes.
  • the deflection of the ink droplets can also be realized via a magnetic field.
  • the homogenization process may be performed by the manufacturer of the ink or immediately before printing. If the ink has a high long-term stability, it is advantageous to carry out the homogenization already in the ink production and the finished ink product the To provide users.
  • the ink may also be prepared by a homogenizer directly in the user's printing device, with the ink being passed from the homogenizing drip into an intermediate container, from which the print head will then draw the ink for printing. Since the ink in this constellation is made "on demand", that is to say only when the printhead needs ink, it is necessary to provide a certain lead time during which the homogenizer produces the required ink.
  • the print head itself to be used both as a printing device and as a homogenizing device.
  • the printhead needs in addition to the usual drip nor a Homogenticianstropfenflinder for performing the homogenization process.
  • the printhead may then draw the raw ink from a first reservoir, homogenize that ink, and direct the filtered ink into an intermediate reservoir.
  • the printhead then retrieves the filtered or homogenized ink from the tundish.
  • Ink which has already proven in the homogenization process that it can be formed by this printhead into ink droplets with the desired charge / mass ratio, is likely to be decomposed into uniform ink droplets again in a subsequent printing process.
  • the above-mentioned possibility of alternately opposing charge of the droplets can be used such that the negatively charged droplets are used for printing and optionally encounter the usual drip while the positively charged droplets are used for homogenization and the homogenizing drip or hit the flapper.
  • the nozzle assembly of the homogenizer should be of the same type as that of the write head of the inkjet device.
  • the diameter of the nozzle of the homogenizer should be equal to or less than the diameter of the nozzle used in the write head, and the operating frequency of the homogenizer should be equal to or greater than the operating frequency of the write head. In this way, it is ensured that the homogenized ink also forms homogeneous droplets of ink in the writing head of the inkjet device and results in a clean typeface.
  • An advantage achievable with the invention is that due to the increased homogeneity of the ink used, a high-quality typeface can be achieved.
  • the ink can be used over a wide range of settings without any problem.
  • pigment inks which are usually less homogenous than dye inks
  • stable ink compositions that are optimally suited for CIJ printing can be obtained.
  • any pigments can be used.
  • TiO 2 pigments are used.
  • the pigments typically have a diameter of 0.5 to 2 ⁇ m for CIJ applications.
  • the ink droplets usually have a size of 50 to 120 microns.
  • a typical unfiltered pigment ink therefore corresponds to a Gaussian-distributed liquid, ie the size distribution of the pigments dissolved in the ink corresponds approximately to a Gaussian distribution. Since the size of the pigments affects the chemical and physical properties of each ink droplet, it is possible to make a selection from the Gaussian distributed pigment ink according to the invention whose charge / weight ratio and its bandwidth are exactly predetermined.
  • the particles suspended in the inks tend to agglomerate. Such agglomerates hinder the formation of droplets and also affect the typeface. Characterized in that the ink before the printing process, the homogenization process according to the invention ensures that the ink used for printing allows uniform drop formation and that there is no annoying agglomeration in the ink due to the short time between homogenization and printing.
  • the homogenizing device is substantially identical to the printhead in which the ink is to be used. This ensures that the ink allows for optimal droplet formation under the environmental conditions encountered during printing.
  • FIG. 1 the structure of a conventional CIJ printhead 10 is shown.
  • An ink jet 12 is fed to the print head 10 via a high pressure line 13 and divided into individual ink droplets 16 of equal size by means of a nozzle arrangement 14 comprising an ultrasonic vibrator and a nozzle.
  • a charging tunnel 18 serves to charge the ink jet 12 electrostatically.
  • An ink droplet 16, which separates from the charged ink jet 12, carries a portion of the charge with it.
  • the charged ink droplets 16 are then passed through a deflector 20 in which the ink droplets 16 are deflected from their original trajectory according to their charge / mass ratio.
  • FIG. 2 an embodiment of the homogenizing device 30 according to the invention is shown.
  • the structure of the homogenizer 30 is broadly similar to that of a conventional CIJ printhead 10.
  • An ink jet 12 is again divided into equally sized ink droplets 16, with the charging tunnel 18 configured to provide the individual ink droplets 16 each with an identical charge amount.
  • the charged ink droplets 16 in the electrostatic field of the deflection electrode 20 are deflected from their original trajectory.
  • the deflection of the ink droplets 16 depends both on the strength of the electrostatic field of the deflection electrode 20, and on the charge / mass ratio of the ink droplets 16.
  • the homogenizer 30 is adjusted so that those, and only those ink droplets 32 having a predetermined charge / mass ratio meet a homogenizing drip 34 and are forwarded by this in an intermediate container 36. While the drip 22 of Fig. 1 is disposed on the path of the undeflected ink droplets 16, the homogenizing drip 34 is arranged so that only the homogeneous droplets 32 strike it.
  • the predetermined value of the charge / mass ratio depends individually on the particular ink and can be determined by appropriately selecting the position of the homogenizing drip 34, the pressure of the ink jet 12, the charging voltage in the charging tunnel 18, the voltage of the deflection electrode 20, and the distance of the Homogenmaschinedropfenfnatureers 34 are set by the charging tunnel 18.
  • the ink droplets 38 whose deflection does not correspond to the value determined by the position of the homogenizing drip 34, are, on the other hand, deflected to a different trajectory and therefore do not strike the homogenizing drip catcher 34. These inhomogeneous droplets of ink 38 are thereby effectively removed from the homogeneous ink droplets 32 separated. On the other hand, all ink droplets which do not hit the homogenization drip, ie the inhomogeneous droplets of ink and the homogeneous droplets of ink which still undergo too little deflection at the beginning of the homogenization process, strike a baffle plate 39 and are conveyed back into the reservoir 24.
  • the ink collected in tundish 36 consists solely of ink droplets 32 having the desired charge / mass ratio.
  • the ink formed from these ink droplets 32 has a high repeatability, i. This ink can be decomposed in a subsequent printing process again into ink droplets 32 with a constant charge / mass ratio, so that a very clean typeface can be achieved.
  • FIG. 3 a further embodiment of the homogenization device 40 according to the invention is shown.
  • both the homogenization of the ink and the printing of a surface 21 with the same printhead 10 can be performed.
  • This embodiment includes, in addition to the homogenizer 30 of FIG Fig. 2 a device not shown in detail for holding and guiding a substrate with the surface to be printed 21 and a conventional drip 22. Via a 3-way valve 42 is selected whether the print head 10 is supplied with raw ink from the reservoir 24 or with homogenized ink from the intermediate reservoir 36.
  • the usual drip 22 is located at the level of the nozzle assembly 14, while the means for holding and guiding the substrate with the surface to be printed 21 above this drip 22 and the homogenizing drip 34 is disposed below the usual drip 22, or vice versa.
  • the whole structure can also be tilted in relation to the horizontal. It is essential that the ink droplets 16 receive an electric charge for printing which is opposite to the charge of the ink droplets 32, 38 which serve to obtain the homogeneous ink.
  • homogenized ink is fed from the intermediate container 36 into the print head 10.
  • the printing process is performed as described above.
  • the ink droplets 16 are charged and guided via the deflection electrode 20 to its intended write matrix position of the surface 21. Unnecessary ink droplets 16 are collected in the drip tray 22 and returned to the surge tank 36 to reuse the ink in a later printing process.
  • the inventive method for obtaining homogeneous ink can be performed with the printhead 10, the inventive method for obtaining homogeneous ink.
  • the 3-way valve 42 is controlled so that the print head 10 raw ink from the reservoir 24 relates.
  • the raw ink jet 12 is decomposed into uniform and co-charged ink droplets 16.
  • ink droplets 32 which have a predetermined charge / mass ratio, are directed by the deflection electrode 20 into the homogenization drip 34 and forwarded from there into the intermediate container 36.
  • inhomogeneous ink droplets 38 which do not have the preset charge / mass ratio, are discarded.
  • Ink droplets 16 picked up by the usual drip catcher 22 during the homogenization process (eg during an adjustment of the device), must not get into the intermediate container 36, but must be returned to the reservoir 24. For this reason, a further 3-way valve 44 is provided, with which it is selectable, in which container the ink from the usual drip 22 is passed.
  • a CIJ printing system from Videojet, Germany, type EXCEL 2000 opaque was modified as follows:
  • the printhead has been replaced by a printhead, including the 53 ⁇ m nozzle, 80 kHz quartz and the software of a CIJ printer from the company Videojet EXCEL 170i Ultra High Speed.
  • the tube of the drip was placed in a vacuum bottle to ensure that only fresh ink was added.
  • the homogenization drip trap is a metal tube whose end is horizontally bent and has an opening with a clear diameter of 1 mm. This trap for the homogenized ink drops opens into a bottle, which can be acted upon by negative pressure.
  • This construction is movable, and thus a stepless adjustment of the distance to the print head or path of ink dropping by positioning the print head is possible.
  • this structure opens up a way to homogenize ink droplets, where we can control the properties of the droplets, size or mass in a large area by extending the flight path and varying the charging voltage.
  • the distance of the homogenizer drip from the printhead was 50 mm in most experiments. Some experiments were also driven with 70 mm distance.
  • the ink drops are generated and loaded.
  • the charging voltage for CIJ printing was between 70 and 275 volts. This is the normal stress of a full matrix 16 x 24 ink drop (h x b).
  • the phasing drops have 10 volts.
  • the modified electronics used to raise the charge voltage for all ink drops to 210 volts. At this charge voltage no interactions of the ink drops are noticeable. Any drops of ink that have not been charged are returned via the standard drip.
  • the threshold is 50 volts to pass the phase drops loaded at 10 volts and not to a higher level.
  • the charged drops are deflected at the high voltage plate and, if they are qualified, i. homogenized ink drops are collected over the homogenization drip.
  • This construction delivers approximately 250 ml of homogenized ink within 3.5 hours, which showed very good performance in different printing systems.
  • the thus obtained printing ink was used for CIJ printing.
  • the viscosity of the printer ink was adjusted to compensate for the evaporation losses incurred in recovering the homogeneous ink. While at Pressure tests with the non-homogenized raw ink 5 to 10% misfeeds occurred, the misfeedings were less than 1% when using the homogenized ink.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP12768760.6A 2011-09-20 2012-09-19 Verfahren und vorrichtung zur gewinnung homogener tinte für inkjet-geräte Active EP2758243B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011113664A DE102011113664A1 (de) 2011-09-20 2011-09-20 Verfahren und Vorrichtung zur Homogenisierung von Tinte für Inkjet-Geräte
PCT/EP2012/068470 WO2013041589A1 (de) 2011-09-20 2012-09-19 Verfahren und vorrichtung zur gewinnung homogener tinte für inkjet-geräte

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EP2758243A1 EP2758243A1 (de) 2014-07-30
EP2758243B1 true EP2758243B1 (de) 2018-12-19

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US (1) US9067429B2 (da)
EP (1) EP2758243B1 (da)
JP (1) JP6204360B2 (da)
KR (1) KR101616654B1 (da)
CN (1) CN103813905B (da)
BR (1) BR112014006404B1 (da)
CA (1) CA2846688C (da)
DE (1) DE102011113664A1 (da)
DK (1) DK2758243T3 (da)
ES (1) ES2713567T3 (da)
MX (1) MX348140B (da)
RU (1) RU2580092C2 (da)
WO (1) WO2013041589A1 (da)

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CN107685539B (zh) * 2017-09-22 2019-04-23 京东方科技集团股份有限公司 喷墨打印喷头、喷墨量测量系统和方法及喷墨量控制方法
CN110525048B (zh) * 2019-08-30 2020-10-09 合肥京东方卓印科技有限公司 一种测量墨滴体积的装置、系统及方法
CN110614849B (zh) * 2019-09-16 2020-12-01 武汉先同科技有限公司 一种基于改进的墨滴充电小字符喷头喷印方法
CN110587884B (zh) * 2019-09-30 2021-07-06 深圳市华星光电半导体显示技术有限公司 调整机构、打印头模组及喷墨打印装置

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CN103813905A (zh) 2014-05-21
EP2758243A1 (de) 2014-07-30
KR101616654B1 (ko) 2016-04-28
RU2014115697A (ru) 2015-10-27
WO2013041589A1 (de) 2013-03-28
MX2014003247A (es) 2015-05-20
BR112014006404B1 (pt) 2021-03-02
BR112014006404A2 (pt) 2017-04-04
CA2846688A1 (en) 2013-03-28
CN103813905B (zh) 2016-08-24
DK2758243T3 (da) 2019-03-25
MX348140B (es) 2017-05-30
ES2713567T3 (es) 2019-05-22
US20140225965A1 (en) 2014-08-14
US9067429B2 (en) 2015-06-30
DE102011113664A1 (de) 2013-03-21
RU2580092C2 (ru) 2016-04-10
JP6204360B2 (ja) 2017-09-27
CA2846688C (en) 2018-01-02
JP2015501228A (ja) 2015-01-15

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