EP1870246B1 - Procédé destiné à l'impression d'une matière d'impression - Google Patents

Procédé destiné à l'impression d'une matière d'impression Download PDF

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Publication number
EP1870246B1
EP1870246B1 EP07012240A EP07012240A EP1870246B1 EP 1870246 B1 EP1870246 B1 EP 1870246B1 EP 07012240 A EP07012240 A EP 07012240A EP 07012240 A EP07012240 A EP 07012240A EP 1870246 B1 EP1870246 B1 EP 1870246B1
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EP
European Patent Office
Prior art keywords
printing
ink
jet
print
current
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Not-in-force
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EP07012240A
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German (de)
English (en)
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EP1870246A3 (fr
EP1870246A2 (fr
Inventor
Peter Schulmeister
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Manroland AG
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Manroland AG
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Publication of EP1870246A3 publication Critical patent/EP1870246A3/fr
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Publication of EP1870246B1 publication Critical patent/EP1870246B1/fr
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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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/546—Combination of different types, e.g. using a thermal transfer head and an inkjet print head
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/008—Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins

Definitions

  • the invention relates to a method for printing a printing material according to the preamble of claim 1. Such a method is known from the document DE 197 45 136 A1 known.
  • inkjet printing devices In printing form-based, preferably operating on the offset printing principle printing machines, such. B. in web-fed rotary printing presses and sheetfed presses, find increasingly pressure-free inkjet printing devices use, in particular the customization of printed products produced by offset printing with z. As barcodes, numbering or other markings serve.
  • Such inkjet printing devices have at least one inkjet print head, the so-called continuous inkjet principle, the drop-on-demand inkjet principle, the thermal inkjet principle, the bubble inkjet principle or any other inkjet Principle can be formed.
  • the inkjet printheads usually have a nozzle row of several juxtaposed nozzles over which ink can be directed to a substrate to be printed.
  • inkjet printing devices Since the maximum printing speed of inkjet printing devices is significantly lower than the maximum printing speed of offset printing devices, it is difficult to print inline on a substrate after offset printing and after inkjet printing.
  • inkjet printing devices With a variety of inkjet printheads, namely on the one hand with multiple inkjet printheads transversely to the transport direction of the substrate or to the printing direction and on the other with a plurality of inkjet printheads in the transport direction of the printing material or in the printing direction, wherein the plurality of inkjet printheads are arranged in an array-like or matrix-like manner next to one another.
  • the required number of inkjet printheads transversely to the printing direction is defined primarily by the desired printing resolution in relation to the given printing resolution of the inkjet printhead used and by the desired total printing width based on the given printing width of an inkjet printhead.
  • the required number of inkjet printheads in the printing direction is determined primarily by two points, namely firstly that the desired printing speed is greater than the given printing speed of an inkjet printhead, and secondly that a plurality of printing inks via the inkjet printing device to be applied to a substrate.
  • the achievable printing speed can also be increased by the or each inkjet printhead of an inkjet printing device to the transport direction the printing material and thus obliquely aligned or inclined to the printing direction.
  • the inclination has the consequence that the effective distance of the nozzles transversely to the printing direction or transport direction of the printing material is reduced and thus the printing resolution can be increased transversely to the printing direction.
  • the printing speed remains unchanged, it can then be printed with a higher areal coverage or optical density. Equally, however, the areal coverage or optical density can be kept constant while increasing the printing speed.
  • this implementation takes place in the hardware of the inkjet printheads, but this has the disadvantage that this conversion is valid only for a defined inclination, only for a defined drop frequency and only for a defined printing speed. Changes z. As the printing speed, so it can not be reacted to, which ultimately results in the printing quality impairing distortions for the print image to be printed with the inkjet printing device.
  • output data, in particular an output data matrix, of a print image to be printed by the inkjet printing device depends on a current print speed, depending on a current drop frequency of the or each inkjet print head of the inkjet printer and depending on a current skew angle of the or each nozzle row of or each inkjet printhead with respect to the transport direction of the printing material before transmission of the data to the inkjet printing device in target data, in particular a target data matrix, converted to control the inkjet printing device in real time.
  • the conversion of the output data into the target data for controlling an inkjet printing device inclined in the printing direction be carried out independently of the hardware of the inkjet print heads of the inkjet printing device.
  • the inventive conversion of the output data in the target data is thus carried out before the transfer of image information from the prepress to the inkjet printing device and thus between the prepress and the inkjet printing device.
  • the conversion of the output data into the target data takes place in real time, wherein the current print speed, the current drop frequency and the current skew angle are variable variables in the conversion of the output data into the target data.
  • the conversion of the output data in the target data z. B. be adapted to a changing printing speed, so that even with changing printing speeds with the inkjet printing device, a high print quality can be guaranteed.
  • the conversion of the output data into the target data takes place via a transformation such that an output data matrix is scaled and sheared in the printing direction as well as transversely to the printing direction.
  • a scaling factor for scaling the output data matrix transversely printing direction is determined from the current skew angle, namely from the ratio of the expansion of the print image transversely to the printing direction with inclined inkjet printing device for extending the same transversely to the printing direction in non-inclined inkjet printing device.
  • a scaling factor for scaling the output data matrix in the printing direction is determined from the current print speed and the current drop frequency.
  • a shear angle to shear the output data matrix is determined from the current skew angle.
  • the conversion of the output data into the target data takes place in such a way that an output data matrix is scanned step by step depending on the current skew angle, the current print speed and the current drop frequency, wherein if one or more nozzle positions of the inkjet Printer to hit a pixel in an output data matrix, a corresponding pixel is set in a target data matrix.
  • FIG. 1 schematically an inkjet printhead comprising a nozzle row 10 of a plurality of juxtaposed nozzles 11, which are positioned along a row or line 12 equidistant from each other.
  • the spacing of the nozzles 11 of such a nozzle row 10 is predetermined by the technology used in the inkjet printing head.
  • the printing material to be printed is preferably moved in the direction of the arrow 13 relative to the preferably stationary ink-jet printing head, wherein in the case of a constant drop frequency of ink and a constant printing speed, the in Fig. 1 illustrated Raster of possible positions 14 for drops of ink results.
  • the droplet frequency, printing speed and the distance of the nozzles are chosen such that four adjacent positions 14 of ink droplets describe a square 15 with a defined surface area.
  • a distance X of the positions 14 in the printing direction determines the resolution in the printing direction
  • a distance Y of the positions 14 transverse to the printing directions determines the resolution transverse to the printing direction, wherein Fig. 1 these two resolutions are the same size.
  • the resolution in the printing direction can be different in size than the resolution transverse to the printing direction.
  • the nozzle row 10 of nozzles 11 with the pressure direction 13 forms an angle ⁇ of approximately 90 °.
  • the area of the square 15 of the Fig. 1 is a measure of the area coverage or optical density that can be used to print.
  • Fig. 2 illustrates the pressure conditions, which then set when the nozzle row 10 is tilted from the nozzles 11 by an angle ⁇ to the printing direction 13, wherein in Fig. 2 the angle ⁇ is for example 30 °. It follows immediately that the distance Y of the ink droplet positions 14 decreases transversely to the printing direction, whereby the resolution can be increased transversely to the printing direction. Should be compared to Fig. 1 are printed with unchanged area coverage or unchanged optical density, the distance X between the positions for ink droplets in the printing direction can be increased by increasing the printing speed.
  • Fig. 2 the achievable area coverage or achievable optical density is visualized by a parallelogram 16 spanned by four adjacent positions 14, the area of the parallelogram 16 of FIG Fig. 2 the area of the square 15 of the Fig. 1 equivalent.
  • inkjet printheads or nozzle rows thereof are inclined relative to the transport direction of the printing material and thus the printing direction, there is a need to provide output data of a print image to be printed with the inkjet printing device in target data for controlling the inkjet printing device in a prepress stage to change.
  • the conversion of the output data in the target data is done in real time, so that during printing z.
  • B. changing printing speed the target data for controlling the inkjet printing device can be changed so as to always provide an optimal print image with the inkjet printing device under changing printing conditions.
  • the current print speed, the current drop frequency and the current skew angle are therefore variable Sizes in the conversion of the output data of the prepress stage in the target data for controlling the inkjet printing device.
  • the skew angle of the or each nozzle row of the or each inkjet printhead of the inkjet printing device is a variable size of the method of the invention, but the skew angle is ideally chosen so that at a given maximum printing speed and a given maximum printing speed maximum drop frequency just a geometric area coverage or optical density of 100% is given.
  • the maximum printing speed is then only by physical parameters such. B. limits the drop speed itself and the associated placement accuracy of the ink droplets on the substrate.
  • the skew angle can also be selected to provide areal coverage of less than 100%.
  • the actual drop frequency is either the same or variable for all the nozzles of an inkjet printhead, and when a continuous inkjet printer is used, the drop frequency is the same for all nozzles, and then, if a drop-on-demand inkjet Pressure device is used, the drop frequency is variable.
  • the current printing speed is detected by measurement via a sensor and represents a variable input variable for the conversion of the output data of the prepress for the inkjet printing device to be printed image in the target data for controlling the inkjet printing device.
  • the output data is transformed into the target data via a transformation, namely such that output data in the printing direction and transversely to the output data are present in the form of an output data matrix, in particular an output bitmap print direction are scaled and further sheared to provide a target data matrix, in particular a target bitmap, for driving the inkjet printing device.
  • a transformation namely such that output data in the printing direction and transversely to the output data are present in the form of an output data matrix, in particular an output bitmap print direction are scaled and further sheared to provide a target data matrix, in particular a target bitmap, for driving the inkjet printing device.
  • the reference numeral 17 indicates an output data matrix provided in a prepress stage for a print image to be printed with an inkjet printer device, this output data matrix 17 being an orthogonal output bitmap which has been screened using known methods.
  • this output data matrix 17 being an orthogonal output bitmap which has been screened using known methods.
  • there are purely binary data per pixel which means that one pixel of the output data matrix 17 is either set and thus black or unset and thus white.
  • the printed image to be printed is an A, wherein in Fig. 3 an unoccupied and thus white pixel with the reference numeral 18 and a set and thus black pixel is designated by the reference numeral 19.
  • a scaling of the output data matrix is performed transversely to the printing direction 13, whereby a scaling factor for the scaling transversely to the printing direction results from the current skew angle.
  • the scaling factor for the scaling transversely to the printing direction results from a ratio of the printing width of the inclined inkjet printhead in relation to the printing width of the non-inclined inkjet printhead.
  • the scaling factor for the scaling transversely to the printing direction results from the ratio of the extent of the printed image transversely to the printing direction with an inclined inkjet printing device for extending the printed image transversely to the printing direction with non-inclined inkjet printing device.
  • a data matrix scaled by this scaling factor is identified by the reference numeral 20.
  • a scaling in the printing direction wherein a scaling factor for scaling in the printing direction from the current print speed and the current drop frequency is determined.
  • the scale factor in the print direction corresponds to the ratio of the print speed of the inkjet print head in non-skewed mode to the print speed thereof in the skewed mode.
  • Fig. 3 numbers a data matrix, which is scaled both transversely to the printing direction and in the printing direction, with the reference numeral 21.
  • a shear of the output data matrix takes place, wherein a shear angle is determined from the current skew angle.
  • a scaled by both scaling factors and the shear angle transformed data matrix corresponding to the target data matrix for driving the inkjet printing device is in Fig. 3 designated by the reference numeral 22.
  • Fig. 4 Visualizes the effects on the transformation of the output data matrix when the print speed is higher than in the embodiment of Fig. 3 , Otherwise, in the embodiment of Fig. 4 all parameters compared to the embodiment of Fig. 3 unchanged. By increasing the printing speed results in a different scaling in the printing direction, so that the data matrix 21 and thus ultimately the target matrix 22 against Fig. 3 is changed. Because opposite Fig. 3 However, only the printing speed has changed, the scaling factor across the printing direction and the shear angle remains unchanged.
  • Fig. 5 Visualizes the relationships in the transformation of the output data matrix 17 in a target data matrix 22 for the case in which the inkjet printing device relative to a curved guide element, such. B. a cylinder, is tilted for printing material to be printed.
  • a transformation is carried out to compensate for or compensate for differences in the transit time caused by the different distances of the nozzles of the or each inkjet printhead of the inkjet printing device to the printing substrate.
  • This transformation is done to compensate for the different distances of the nozzle to the substrate between the scaling in the printing direction and the shear, but here too the order is arbitrary.
  • Fig. 5 is a scaled in both directions and transformed to compensate for the different nozzle distances data matrix with the reference numeral 23, wherein the target data matrix 22 is additionally sheared by the shear angle.
  • the procedure is preferably such that the output data of the print image to be printed is adjusted so that such print image information associated with the nozzles at a greater distance from the substrate to be printed, compared with such print image information, the nozzles with a smaller distance are assigned by printing material to be printed, be moved to a position earlier in the printing direction.
  • a second variant of the method according to the invention for converting the output data of the prepress stage into the target data for controlling the inkjet printing device is described below with reference to FIG Fig. 6 to 8 described, wherein this conversion of the output data in the target data according to the second variant of the present invention takes place in that an output data matrix depending on the current skew angle, the current print speed and the current drop frequency is scanned stepwise, wherein if one or more nozzle positions of the inkjet -Druck worn hit a pixel in the output data matrix, a corresponding pixel in the target data matrix is set.
  • Fig. 6 shows an example of an L to be printed by means of an inkjet printing device an output data matrix 24 of 8x12 pixels, wherein set for printing pixels in Fig. 6 are shown as rounded squares 25.
  • the resolution for the output data matrix 24 in both directions of the same 200 dpi so that a screen width 26 of 127 ⁇ m results in both directions.
  • This output data matrix 24 of the Fig. 6 is according to Fig. 7 assuming a skew angle ⁇ of a nozzle row 10 of nozzles 11 is virtually sampled relative to the printing direction 13, wherein when one or more nozzle positions 11 strike a set pixel 25 in the output data matrix 24, a corresponding pixel 27 is set in the target data matrix.
  • a step size 28 of this sample which corresponds to the raster width of the target data matrix, depends on the current print speed and the current drop frequency. The step size of the scan and thus the raster width of the target data matrix is greater, the greater the print speed.
  • pixels 27 set in the target data matrix are represented as circles which are shown somewhat smaller than they could cover in terms of area.
  • Fig. 8 is compared to Fig. 7 increases the step size of the scan or the raster width 28 of the target data matrix by increasing the printing speed at a constant drop frequency, wherein Fig. 8 the pixels 27 of the target data matrix have approximately the same point density as the pixels 25 of the output data matrix. As a result, printing speed can be increased with almost unchanged optical density.
  • the setting of the pixels in the target data matrix can be done in binary form or via gray scale modulation. Then, when the inkjet printing device uses binary inkjet printheads, pixels in the target data matrix, all of which have the same drop size, are set or not, depending on whether nozzle positions hit pixels in the output data matrix during the scan. If, on the other hand, an inkjet printing device is used whose inkjet printheads can modulate gray values, then when a nozzle position encounters a pixel in the output data matrix, the gray value in the target data matrix is set, which is the ratio of the areal coverage of an ink drop and the imaginary pixel area closest to this position.
  • the conversion of output data into target data described above is performed in real time, so that a speed change of the printing speed in the inkjet printing device can be taken into account.
  • a side effect of the method described is that at a lower printing speed than the maximum printing speed, a higher optical density can be achieved. Especially when printing black and white graphics or when printing texts, this side effect has a positive effect on the print quality. However, if this side effect is perceived as disturbing, then the target data matrix can be thinned out by deleting pixels, in such a way that if only one pixel of the target data matrix has multiple pixels, only the best placed pixels are selected.

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  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (12)

  1. Procédé d'impression d'une matière d'impression selon lequel
    on imprime la matière d'impression par un procédé d'impression utilisant une forme d'impression notamment selon un procédé d'impression offset ainsi que selon un procédé d'impression par jet d'encre, sans forme d'impression, en ligne par rapport au procédé d'impression utilisant une forme d'impression,
    une installation d'impression par jet d'encre pour la réalisation du procédé d'impression par jet d'encre comportant au moins une tête d'impression par jet d'encre ayant au moins une rangée de buses (10) composée de buses (11), placée l'une à côté de l'autre, qui dirigent l'encre d'impression sur la matière à imprimer, et
    la ou chaque tête d'impression par jet d'encre est alignée par rapport à la matière d'impression de façon que la ou chaque rangée de buses de la ou de chaque tête d'impression par jet d'encre soit inclinée par rapport à la direction de transport de la matière d'impression,
    caractérisé en ce que
    avant de transmettre les données à l'installation d'impression par jet d'encre, les données de départ notamment une matrice de départ d'une image d'impression à imprimer par l'installation d'impression par jet d'encre sont converties en temps réel en des données cibles notamment en une matrice cible pour commander l'installation d'impression par jet d'encre, en fonction de la vitesse d'impression actuelle du procédé d'impression utilisant une forme d'impression et ainsi du procédé d'impression par jet d'encre, en fonction de la fréquence actuelle des gouttes de la ou de chaque tête d'impression par jet d'encre de l'installation d'impression par jet d'encre et en fonction de l'angle d'inclinaison actuel de la ou de chaque rangée de buses (10) de la ou de chaque tête d'impression par jet d'encre, par rapport à la direction de transport de la matière d'impression.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    par des techniques de mesure, on saisit la vitesse actuelle d'impression du procédé d'impression utilisant sur une forme d'impression et ainsi du procédé d'impression par jet d'encre, et la vitesse est ainsi une grandeur variable de la conversion des données de sortie en des données cibles commandant l'installation d'impression par jet d'encre.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    la fréquence actuelle des gouttes est la même pour toutes les buses de la ou de chaque tête d'impression par jet d'encre, si l'on utilise une installation continue d'impression par jet d'encre, ou cette fréquence est variable si l'on utilise une installation d'impression par jet d'encre fournissant des gouttes à la demande, à chacune des buses de la ou de chaque tête d'impression à jet d'encre.
  4. Procédé selon une ou plusieurs des revendications 1 à 3,
    caractérisé en ce que
    l'on choisit l'angle d'inclinaison actuel, pour obtenir une couverture géométrique de surface qui atteint juste encore 100 %, pour la vitesse d'impression maximale et pour la fréquence de gouttes maximale.
  5. Procédé selon l'une ou plusieurs des revendications 1 à 4,
    caractérisé en ce que
    la conversion des données de sortie en données cibles se fait par une transformation de mise à l'échelle et une transformation affine d'une matrice de données de sortie, dans la direction d'impression et dans la direction transversale à la direction d'impression.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    le coefficient d'échelle pour la mise à l'échelle de la matrice de données de sortie, transversalement à la direction d'impression se détermine à partir de l'angle d'inclinaison actuel, à savoir le rapport entre l'extension de l'image d'impression transversalement à la direction d'impression lorsque l'installation d'impression par jet d'encre est inclinée par rapport à l'extension de l'image d'impression transversalement à la direction d'impression pour une installation d'impression à jet d'encre non inclinée.
  7. Procédé selon la revendication 5 ou la revendication 6,
    caractérisé en ce que
    l'on détermine un coefficient d'échelle pour la mise à l'échelle de la matrice de données de sortie dans la direction d'impression à partir de la vitesse d'impression actuelle et de la fréquence actuelle des gouttes.
  8. Procédé selon l'une ou plusieurs des revendications 5 à 7,
    caractérisé en ce que
    l'on détermine un angle de transformation affine pour transformer la matrice de données de sortie à partir de l'angle d'inclinaison actuel.
  9. Procédé selon l'une ou plusieurs des revendications 1 à 4,
    caractérisé en ce que
    l'on convertit les données de sortie en données cibles en détectant une matrice de données de sortie en fonction de l'angle d'inclinaison actuel, de la vitesse d'impression actuelle et de la fréquence actuelle des gouttes, par une détection pas à pas et si une ou plusieurs positions des buses de l'installation d'impression par jet d'encre arrivent sur un point image d'une matrice de données de sortie, on fixe un point image correspondant dans une matrice de données cibles.
  10. Procédé selon la revendication 9,
    caractérisé en ce que
    pour moduler les niveaux de gris, on fixe le niveau de gris respectif de la matrice de données cibles qui est le plus proche du rapport de la couverture en surface d'une goutte et d'un point image à cet endroit.
  11. Procédé selon la revendication 9 ou 10,
    caractérisé en ce que
    le pas de la détection de la matrice de données de sortie dépend de la vitesse d'impression actuelle et de la fréquence actuelle des gouttes, le pas étant d'autant plus grand que la vitesse d'impression est grande.
  12. Procédé selon l'une ou plusieurs des revendications 1 à 11,
    caractérisé en ce que
    si l'installation d'impression par jet d'encre est inclinée par rapport à un élément bombé de guidage de la matière d'impression et si les buses de la ou de chaque rangée de buses de la ou de chaque tête d'impression à jet d'encre sont à une distance différente de la matière d'impression, on convertit les données de sortie en données cibles de façon à compenser la différence de temps de parcours de l'encre jusqu'à la matière d'impression, et qui dépend de la différence de distance entre les buses et la matière d'impression,
    les données de sortie de l'image d'impression à imprimer étant adaptées de façon que l'information d'image d'impression associée à des buses plus éloignées de la matière d'impression soient décalées vers une position plus avancée dans la direction d'impression que l'information d'image d'impression associée à des buses plus rapprochées de la matière d'impression.
EP07012240A 2006-06-24 2007-06-22 Procédé destiné à l'impression d'une matière d'impression Not-in-force EP1870246B1 (fr)

Applications Claiming Priority (1)

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DE102006029088A DE102006029088A1 (de) 2006-06-24 2006-06-24 Verfahren zum Bedrucken eines Bedruckstoffs

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EP1870246A2 EP1870246A2 (fr) 2007-12-26
EP1870246A3 EP1870246A3 (fr) 2008-07-16
EP1870246B1 true EP1870246B1 (fr) 2010-01-06

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US (1) US7571971B2 (fr)
EP (1) EP1870246B1 (fr)
JP (1) JP4885803B2 (fr)
CN (1) CN101117061B (fr)
CA (1) CA2592878C (fr)
DE (2) DE102006029088A1 (fr)

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JP2008001105A (ja) 2008-01-10
DE502007002529D1 (de) 2010-02-25
US7571971B2 (en) 2009-08-11
JP4885803B2 (ja) 2012-02-29
CA2592878C (fr) 2010-11-30
DE102006029088A1 (de) 2007-12-27
CA2592878A1 (fr) 2007-12-24
CN101117061A (zh) 2008-02-06
US20080001982A1 (en) 2008-01-03
EP1870246A3 (fr) 2008-07-16
CN101117061B (zh) 2011-04-20
EP1870246A2 (fr) 2007-12-26

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