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EP4173832A1 - Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung - Google Patents

Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung Download PDF

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Publication number
EP4173832A1
EP4173832A1 EP21205874.7A EP21205874A EP4173832A1 EP 4173832 A1 EP4173832 A1 EP 4173832A1 EP 21205874 A EP21205874 A EP 21205874A EP 4173832 A1 EP4173832 A1 EP 4173832A1
Authority
EP
European Patent Office
Prior art keywords
printhead
substitute
nozzles
color
nozzle
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Withdrawn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
EP21205874.7A
Other languages
English (en)
French (fr)
Inventor
Francisco Javier PEREZ GELLIDA
Raphael Meyer
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.)
Bobst Mex SA
Original Assignee
Bobst Mex SA
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 Bobst Mex SA filed Critical Bobst Mex SA
Priority to EP21205874.7A priority Critical patent/EP4173832A1/de
Publication of EP4173832A1 publication Critical patent/EP4173832A1/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Withdrawn legal-status Critical Current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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
    • 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
    • B41J2/2142—Detection of malfunctioning 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads

Definitions

  • the invention relates to a method for controlling a printing device comprising a printhead with a plurality of nozzles and a printing machine.
  • ink is dosed on a substrate by means of a multitude of nozzles from a printhead of the respective printing device, thereby forming ink dots or pixels on the substrate.
  • the type of ink dots as well as their size and distribution on the substrate result in a color impression being perceived by a human eye.
  • individual nozzles of the printhead can become inoperable during operation of the printing machine, e.g. by becoming deviated, lost, clogged, crooked or split.
  • no or at least only insufficient amounts of ink can be dosed anymore by the printhead at the position of the substrate associated to the defective nozzle, resulting in reduced printing quality.
  • the affected area of the substrate is perceived as having an uneven color appearance.
  • redundancy nozzle for each of the nozzles in the printhead. Said redundancy nozzle can continue dosing the same ink in case a nozzle becomes defective. However, keeping a high number of redundant nozzles result in larger and more expensive printheads, which is not desirable for many applications.
  • Another possibility is to compensate for a defective nozzle by nozzles arranged adjacent to the defective one.
  • the adjacent nozzles can provide an increased amount of ink next to the parts of the substrate the defective nozzle would have printed upon.
  • the idea behind this solution is that the additional amount of ink spreads into the missing area left on the substrate, thereby eventually filling up the gap.
  • the extent any ink spreads on a substrate is highly dependent on the interaction of the substrate with the respective ink, especially based on the surface tension of the ink on the substrate.
  • the additional ink does not spread at all but coalesce right on the edges of the empty area, actually resulting in even worse printing results by pronouncing the empty areas of the substrate.
  • EP 0 983 885 A2 discloses a method for operating an ink jet printer in which an inoperative black printing element is substituted for by printing with a plurality of non-black color printing elements at the pixel locations on which the black printing element would have been printed upon.
  • the quality of the printing results achievable by this method depends strongly on the accuracy of delivering the alternative inks on the exact same locations on the substrate the defective nozzle would have been printed upon. In case of high-resolution and high-throughput printing, this accuracy cannot be achieved in a reliable manner or only by using very expensive equipment. Additionally, the achievable color match between the color obtained by the non-black color printing elements and actual black still depends on the spreading behavior of the alternative inks on the substrate, i.e. on the individual surface tension of each of the non-black inks used for compensation.
  • the printing machine should be simple and cheap.
  • the object of the invention is solved by a method for controlling a printing device comprising a printhead with a plurality of nozzles along a printing direction of the printhead and a plurality of nozzles along a lateral direction of the printhead being perpendicular to the printing direction.
  • the method comprises the following steps: Detecting a defective nozzle and a pixel position associated to the defective nozzle along the lateral direction of the printhead (i.e. perpendicular to substrate's running direction). Then, a target color associated to the defective nozzle is determined and one or more substitute inks are ejected from a multitude of compensating nozzles to form substitute ink dots, wherein the substitute ink dots are of a substitute color or add up to a substitute color.
  • the multitude of compensating nozzles comprises a first compensating nozzle associated to the same pixel position along the lateral direction of the printhead as the defective nozzle and a second and third compensating nozzle associated to a pixel position adjacent to the pixel position of the first compensating nozzle at opposite sides along the lateral direction of the printhead.
  • the invention is based on the idea to use a multitude of compensating nozzles arranged at different but adjacent positions along the lateral direction of the printhead. In this way, a higher tolerance in positioning the compensating nozzles during ejection of the one or more substitute ink is achieved, while at the same time ensuring a high printing quality.
  • the visual perception of the area the substitute ink dots are printed upon is smooth because of the larger area the substitute ink is provided on compared to merely using a single compensating nozzle as known in the art.
  • the compensating nozzles and the defective nozzle are members of the plurality of nozzles of the printhead.
  • the plurality of nozzles of the printhead can be an array of nozzles.
  • several nozzles associated to the same ink are arranged next to each other along the printing direction of the printhead forming a nozzle line.
  • more than one nozzle line is arranged next to each other, each nozzle line preferably being associated to another ink.
  • Such an array of nozzles allows for printing a multitude of inks on a substrate within a single pass of the printhead.
  • pixel position denotes an area on a substrate the printhead prints upon with a nozzle of the printhead associated to this pixel position. Generally, this area on the substrate is not completely filled with the respective ink, but with one or more dots formed by the ink on the substrate.
  • the substrate preferably is paper, cardboard, plastic, films or foil.
  • the printhead can have nozzles associated to five or more base colors, preferably nozzles associated to six to eight base colors.
  • the base colors can comprise at least one further base color other than cyan, magenta, yellow and black, i.e. at least one further base color other than used in conventional CMYK printing.
  • the base colors comprise or consist of cyan, magenta, yellow, black, orange, violet and white, i.e. preferably the printing device can print colors in the so-called CMYKOV+W color space.
  • the target color is black. Being able to substitute a defective nozzle being responsible for printing black color is especially important, as the printing quality perceived by the human eye can diminish strongly in case parts of a printed motif is missing black. Therefore, it is especially desirable to compensate for missing black ink dots.
  • the substitute color can be determined as being the color of ink dots achievable by the one or more substitute inks with a minimum distance to the target color in the CIELAB space.
  • the substitute color can be determined as being the color which has the smallest Euclidian distance to the target color in the CIELAB space and which is achievable by ink dots of the one or more substitute inks associated to the compensating nozzles.
  • all of the compensating nozzles eject the same substitute ink. With other words, only a single substitute ink is used for producing the substitute color.
  • more than one substitute ink is ejected from the compensating nozzles, wherein the difference of the surface tension of the substitute inks on a substrate printed upon is below a pre-set threshold value.
  • the use of more than one substitute ink makes available a large color space from which the substitute color can be chosen. Further, by choosing the substitute inks in a way to ensure that the difference between their respective surface tension is below the pre-set threshold value, it can be prevented that the substitute inks spread differently on the substrate. Thus, an even distribution of the substitute inks and therefore of the substitute color is achievable, providing even better and more consistent printing results.
  • a defective nozzle can be detected by measuring the optical density at the pixel position associated to the respective nozzle.
  • the optical density is the negative decadic logarithm of the transmission rate, i.e. of the ratio of the transmitted to the incident radiant flux received by a material, multiplied by 100 %.
  • a given nozzle can be identified as being a defective nozzle if the optical density at the pixel position associated to said nozzle is below a certain pre-set threshold.
  • the pre-set threshold can be 90 % or less.
  • a pixel can have a size of 25 ⁇ m or less along the lateral direction of the printhead, preferably of 21 ⁇ m or less. Such a pixel size especially occurs in high-resolution printing, e.g. for printing with a resolution of 1200 dpi.
  • the first, second and third compensating nozzle for providing the one or more substitute inks to minimize the effect of small deviations during ink application on the overall printing quality.
  • a warning message can be shown on a display in case a defective nozzle is detected.
  • the warning message especially includes an information on the target color and the substitute color.
  • the display can be a touch-sensitive display which the user of the printing device can interact with to operate the printing device.
  • the user can choose a different substitute color other than the one automatically found by the printing device or stop the printing job, if necessary.
  • the object of the invention is further solved by a printing device comprising a printhead with a plurality of nozzles along a printing direction of the printhead and a plurality of nozzles along a lateral direction of the printhead being perpendicular to the printing direction, the printing device being adapted to apply the method as described above.
  • the printing device is preferably a high-throughput printing machine for professional applications.
  • the printing machine is used in the large-scale production of printed paper or cardboard, plastic, films, packaging materials or labels.
  • the printing device comprises a control unit with a color computing module, the control unit being adapted to determine the substitute color and to control the operation of the plurality of nozzles in the printhead.
  • the substitute color can be determined automatically by the color computing module, thereby ensuring an interruption-free operation of the printing device.
  • Fig. 1 shows a printing device 10 comprising a housing 12 and an ink supply module 14 and a printing module 16 contained in the housing 12.
  • the ink supply module 14 comprises a multitude of ink reservoirs 18, wherein each of the ink reservoirs 18 comprises ink of a different base color.
  • the ink reservoirs 18 provide inks of the base colors cyan, magenta, yellow, black, orange, violet and white.
  • the printing device 10 could of course use different base colors than the ones recited above and less or more than eight ink reservoirs 18. Also, more than one of the ink reservoirs 18 can comprise ink of the same base color.
  • the ink supply module 14 is fluidically connected to a printhead 20 of the printing module 16 via an ink supply line 22 such that ink from each of the ink reservoirs 18 can be provided from the ink supply module 14 to the printhead 20.
  • the printhead 20 comprises a multitude of sub-modules 24 arranged next to each other along a printing direction P of the printhead 20.
  • Each of the sub-modules 24 comprises a multitude of nozzles 25 for ejecting ink provided from the ink supply module 14 (see Fig. 2 ).
  • each of the sub-modules 24 can be or comprise or a printhead of the type "Samba ® " available from the company Fujifilm.
  • the ink supply module 14, the ink supply line 22 and/or the printhead 20 can comprise any kind of suitable valves and/or distribution system for distributing any of the inks to an associated nozzle 25 of the printhead 20.
  • the printing module 16 comprises an unwinding roll 26 onto which a substrate 28 to be printed upon can be provided by a (not shown) user of the printing device 10.
  • the substrate 28 is transported, as indicated by arrows in Fig. 1 , by a series of rolls 30 to a rewinding roll 32 which is used to collect the printed substrate, thereby passing the printhead 20 along the printing direction P.
  • the printing module 16 comprises a preparation module 34, which prepares the substrates prior to printing, e.g. by heating the substrate to a processing temperature, and an after-printing module 36.
  • the after-printing module 36 can be used for drying the printed substrate 28 but can also have additional functionality like measuring the optical density of the printed substrate 28.
  • the printing device 10 has a display 38 which in the shown embodiment is a touch-sensitive display functioning as a human-machine-interface of the printing device 10 to the user.
  • the display 38 is connected to a control unit 40 which is used to control the operation of the printing device 10.
  • control unit 40 can be connected in a signal-transmitting manner to one, more than one or all components of the printing device 10.
  • control unit 40 comprises a color computing module 42 whose function will be explained in more detail below.
  • Fig. 2 one of the sub-modules 24 of the printhead 20 is shown in more detail.
  • the sub-module 24 comprises a multitude of nozzles 25 which are arranged in a regular pattern along the printing direction P and along a lateral direction L being perpendicular to the printing direction P.
  • the nozzles 25 are an array of nozzles.
  • the nozzles 25 being arranged at the same position along the printing direction P are associated to the same ink, while the nozzle 25 being arranged at different positions along the printing direction P but at the same position along the lateral direction L are associated to different inks.
  • a nozzle 25 of the printhead 20 can become damaged, e.g. by becoming deviated, lost, clogged, crooked or split. With other words, said nozzle becomes a defective nozzle 44
  • Fig. 3 shows a schematic top view of a printed area of the substrate 28.
  • a total of nine pixel positions 1 to 9 along the lateral direction L of the printhead 20 is shown, with the defective nozzle being the one which is associated to pixel position 7.
  • Each pixel position has a size along the lateral direction L of 25 ⁇ m or less, preferably of 21 ⁇ m or less.
  • a target color e.g. black
  • the defective nozzle 44 and the pixel position associated to the defective nozzle 44 is detected (see step S1 in Fig. 7 ).
  • Said detection can be made by the user of the printing device 10 when checking the printed substrate collected on the rewinding roll 32.
  • the detection is automatically done by the printing device 10, e.g. by measuring the optical density of the printed substrate by the after-printing module 36.
  • the corresponding nozzle 25 is termed to be a defective nozzle 44.
  • the pre-set threshold can be stored within the control unit 40 and can be adjustable by the user via the touch-sensitive display 38.
  • a target color associated to the defective nozzle 44 is determined (see step S2 in Fig. 7 ).
  • the substrate shall be printed black, i.e. the target color is black.
  • control unit 40 can take into account information about the current print job of the printing device 10.
  • the pixel position of the defective nozzle 44 is used to determine a first compensating nozzle 46 having the same pixel position along the lateral direction L of the printhead 20, i.e. in the shown embodiment a nozzle 25 which is also associated to pixel position 7 as shown in Fig. 2 .
  • Said first compensating nozzle 46 can be a further nozzle 25 within the same sub-module 24 of the printhead 20 or can be a nozzle 25 of another sub-module 24 (see Fig. 1 ).
  • a second compensating nozzle 48 and a third compensating nozzle 50 are determined, wherein the second and third compensating nozzles 48 and 50, respectively, are associated to a pixel position adjacent to the pixel position of the first compensating nozzle 46 at opposite sides along the lateral direction of the printhead 20.
  • the second compensating nozzle 48 is associated to pixel position 6 while the third compensating nozzle 50 is associated to pixel position 8.
  • the second and third compensating nozzles 48 and 50 can be a nozzle 25 within the same sub-module 24 of the printhead 20 as the defective nozzle 44 or can be a nozzle 25 of another sub-module 24 (see Fig. 1 ).
  • the first, second and third compensating nozzle 46, 48 and 50, respectively, are then used for ejecting one or more substitute inks to form ink dots on the substrate 28, wherein the substitute ink dots are of a substitute color or add up to a substitute color (see step S3 of Fig. 2 ).
  • the substitute color is determined within the control unit 40, especially in the color computing module 42.
  • the substitute color is determined as being the color of ink dots achievable by the one or more substitute inks having a minimum distance to the target color in the CIELAB space, said minimum distance being calculated as being the Euclidian distance in the CIELAB space between the substitute color and the target color.
  • Fig. 4 a first alternative for compensating for the defective nozzle 25 associated to pixel position 7 is shown.
  • all of the compensating nozzles i.e. the first, second and third compensating nozzle 46, 48 and 50, respectively, eject the same substitute ink as indicated by diagonal lines in Fig. 4 , thereby forming a continuous strip of the same substitute color along pixel positions 6 to 8.
  • This alternative is especially suitable, if one of the base colors provided in the ink reservoirs 18 closely matches the target color.
  • this ink can be used as the unique substitute ink.
  • This embodiment also corresponds to the choice of first, second and third compensating nozzle 46, 48 and 50, respectively, as shown in Fig. 2 , wherein each of said compensating nozzle 46, 48 and 50 are associated to the same position along the printing direction of the printhead 20 and thereby to the same ink provided from the ink supply module 14 (see Fig. 1 ).
  • a second alternative for compensating for the defective nozzle 44 associated to pixel position 7 is shown.
  • two different substitute inks are applied on the substrate 28 in a checkerboard pattern along pixel positions 6 to 8.
  • a first substitute ink is indicated with diagonal lines and a second substitute ink is indicated with lines along the printing direction P.
  • the first and second substitute inks are selected such that the difference of the difference of their respective surface tension on the substrate 28 is below a pre-set threshold value. This ensures that both of the substitute inks exhibits a comparable extent of ink spreading, providing a homogenous substitute color.
  • the first substitute ink is cyan and the second substitute ink is magenta.
  • At least two compensating nozzles per associated pixel position are used, i.e. there are at least two first compensating nozzles 46 associated to the same pixel position as the defective nozzle 44, at least two second compensating nozzles 48 and at least two third compensating nozzles 50 associated to pixel positions adjacent to the pixel position of the defective nozzle 44.
  • Fig. 6 a third alternative for compensating for the defective nozzle 44 associated to pixel position 7 is shown.
  • a first substitute ink is indicated with diagonal lines pointing to the left-hand side
  • a second substitute ink is indicated with lines along the printing direction P
  • a third substitute ink is indicated with diagonal lines pointing to the right-hand side.
  • the multitude of substitute inks are selected such that the differences of their respective surface tensions on the substrate 28 are below a pre-set threshold value.
  • the first substitute ink is cyan
  • the second substitute ink is magenta
  • the third substitute ink is yellow.
  • At least three compensating nozzles per associated pixel position are used, i.e. there are at least three first compensating nozzles 46 associated to the same pixel position as the defective nozzle 44, at least three second compensating nozzles 48 and at least three third compensating nozzles 50 associated to pixel positions adjacent to the pixel position of the defective nozzle 44.
  • the method for controlling the printing device 10 according to the invention allows to compensate for defective nozzles of the printhead 20 in an easy, reliable and automated manner.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
EP21205874.7A 2021-11-02 2021-11-02 Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung Withdrawn EP4173832A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21205874.7A EP4173832A1 (de) 2021-11-02 2021-11-02 Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21205874.7A EP4173832A1 (de) 2021-11-02 2021-11-02 Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung

Publications (1)

Publication Number Publication Date
EP4173832A1 true EP4173832A1 (de) 2023-05-03

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EP21205874.7A Withdrawn EP4173832A1 (de) 2021-11-02 2021-11-02 Verfahren zur steuerung einer druckvorrichtung und druckvorrichtung

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0983885A2 (de) 1998-08-25 2000-03-08 Denso Corporation Luftsteurvorrichtung für Klimaanlage
US20030085950A1 (en) * 2001-11-06 2003-05-08 Canon Kabushiki Kaiska Image correction method for inkjet recording system
EP2952355A1 (de) * 2014-05-02 2015-12-09 OCE-Technologies B.V. Verfahren zur kompensation einer ausfallenden düse
US20150375499A1 (en) * 2014-06-26 2015-12-31 Seiko Epson Corporation Liquid ejecting apparatus, method of controlling liquid ejecting apparatus, and program for controlling liquid ejecting apparatus
DE102014219965A1 (de) * 2014-10-01 2016-04-07 Heidelberger Druckmaschinen Ag Verfahren zur Kompensation ausgefallener Druckdüsen in Inkjet-Drucksystemen
US20190344560A1 (en) * 2017-02-02 2019-11-14 Hewlett-Packard Development Company, L.P. Nozzle replacement to minimize visual discontinuities

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0983885A2 (de) 1998-08-25 2000-03-08 Denso Corporation Luftsteurvorrichtung für Klimaanlage
US20030085950A1 (en) * 2001-11-06 2003-05-08 Canon Kabushiki Kaiska Image correction method for inkjet recording system
EP2952355A1 (de) * 2014-05-02 2015-12-09 OCE-Technologies B.V. Verfahren zur kompensation einer ausfallenden düse
US20150375499A1 (en) * 2014-06-26 2015-12-31 Seiko Epson Corporation Liquid ejecting apparatus, method of controlling liquid ejecting apparatus, and program for controlling liquid ejecting apparatus
DE102014219965A1 (de) * 2014-10-01 2016-04-07 Heidelberger Druckmaschinen Ag Verfahren zur Kompensation ausgefallener Druckdüsen in Inkjet-Drucksystemen
US20190344560A1 (en) * 2017-02-02 2019-11-14 Hewlett-Packard Development Company, L.P. Nozzle replacement to minimize visual discontinuities

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