EP2829400B1 - Method and apparatus for producing printing stocks, and printing method - Google Patents

Method and apparatus for producing printing stocks, and printing method Download PDF

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Publication number
EP2829400B1
EP2829400B1 EP14177387.9A EP14177387A EP2829400B1 EP 2829400 B1 EP2829400 B1 EP 2829400B1 EP 14177387 A EP14177387 A EP 14177387A EP 2829400 B1 EP2829400 B1 EP 2829400B1
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EP
European Patent Office
Prior art keywords
printing
partial
separation
portions
print color
Prior art date
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Active
Application number
EP14177387.9A
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German (de)
French (fr)
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EP2829400A3 (en
EP2829400A2 (en
Inventor
Florian Fejfar
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.)
Manroland Web Systems GmbH
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Manroland Web Systems GmbH
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Publication date
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Publication of EP2829400A2 publication Critical patent/EP2829400A2/en
Publication of EP2829400A3 publication Critical patent/EP2829400A3/en
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B41F7/025—Multicolour printing or perfecting on sheets or on one or more webs, in one printing unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • B41C1/182—Sleeves; Endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/02—Rotary lithographic machines for offset printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing

Definitions

  • the invention relates to a method for producing printing forms, which serve the printing of a printing material web with a seamless transition or seamless variable format image in offset printing, according to the preamble of claim 1. Furthermore, the invention relates to a method for printing a printing substrate with a seamless or transitionless endless or format-variable printed image, which is gesgesammennot from at least two printing forms, in offset printing using such printing forms.
  • the printing of a substrate web with a seam-free or seamless continuous or formatvariablem print image is so far only to an insufficient extent possible because the offset printing printing forms are used, the defined length and / or beyond a pressure-free area for the device for fastening the printing form on the printing form cylinder, commonly referred to as a clamping channel, and thus leave a pressure-free area on the substrate during printing.
  • an overall separation of the respective printing ink must be divided into at least two printing forms for each printing ink of the printed image to be printed, so that With a first printing form, a first partial separation of the total separation of the respective printing ink and with a second printing form a second partial separation of the total separation of the respective printing ink onto the printing material can be printed.
  • the second subseparation of the second printing form prints in those regions or sections of the printing material web to be printed, which can not be printed with the first subseparation of the first printing form due to the limited length thereof.
  • the second subseparation of the second printing form accordingly fills in the first subseparation of the first printing form in the regions in which the first subseparation of the first printing form can not print on the printing material.
  • DE 31 17 663 A1 discloses a seamless or seamless, endless printing of a substrate web by means of two printing plates, which print partially overlapping the substrate.
  • the present invention has the object, a novel method for producing printing forms, which are used to print a substrate web with a seamless endless or format variable image in offset printing, and a corresponding method for printing a substrate web with a seamless endless or formatvariablen To create print image in offset printing.
  • the Bacseparation of each ink is divided into the subseparations, that the substrate web can be printed in the first sections exclusively from the first subseparation of the first printing form and in second sections exclusively from the second subseparation of the second printing form, however, in third sections of Substrate printing with the first subseparation of the first printing form and the second subseparation of the second printing form overlapping or superimposed can be printed.
  • the total separation of the respective printing ink is subdivided into the subseparations of the respective printing ink in such a way that expected tone value fluctuations are compensated by means of a tone value correction in the superimposition of the two subseparations in the printing, wherein the tone value correction is effected depending on the degree of superposition of the two subseparations.
  • an area ratio is introduced. This is the division of the print image on the involved in the printing process at least two printing plates.
  • the area fraction usually moves between 0% and 100%, since a division of one printing or pixel onto at least two printing forms involved in the printing otherwise represent a change in the visual impression compared to the non-divided print image and thus not to a identical optical reproduction of the original print image would result.
  • the total separation of the respective printing ink is divided among the subseparations in such a way that the first subseparation in the first sections of the printing material web provides 100% surface area of the respective area coverage for the respective printing ink that the second subseparation in the second sections of the printing material web provides for the respective ink 100% area fraction of the respective area coverage, and that for the third sections of the printing substrate, the first subseparation provides a position-dependent first area portion of the respective area coverage and the second subseparation a position-dependent second area portion of the respective area coverage.
  • the total separation of the respective printing ink is preferably subdivided into the subseparations of the respective printing ink such that in the third sections of the printing material web with the first area fraction of the first subseparation and the second area fraction of the second subseparation at least at some positions of the third sections of the printing material web in total overfilling as 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate.
  • the total separation of the respective printing ink is divided into the subseparations of the respective printing ink in such a way that in the third sections of the printing material web with the first area fraction of the first subseparation and the second area fraction of the second subseparation at each position of the third sections of the printing substrate web 100% in total Area fraction of the respective area coverage of the respective printing ink can be printed on the substrate.
  • the two subseparations are designed such that they can be printed overfilling with the same in the third sections, a high quality seamless endless or variable format printing can be realized in offset printing.
  • the method according to the invention for printing a printing material web with a seamless or endless printing image uses the printing forms produced by the printing plate production method according to the invention.
  • the invention relates to a method for producing printing forms which serve for printing a printing material web with a seamless, endless or format-variable printed image in offset printing. Furthermore, the invention relates to a device for producing such printing plates and a method for printing a printing material web with a seamless transitionless or format variable printed image in offset printing using such printing forms.
  • the total separation of the respective printing ink is subdivided into at least two printing forms for each printing ink to be applied in offset printing during seamless or format-variable printing on the printing substrate, so that a first partial printing of the total separation of the respective printing ink and of a second printing separation takes place with a first printing form Printing form a second
  • Partial separation of the total separation of the respective printing ink can be printed on the substrate.
  • the total separation of the respective printing ink is subdivided into the subseparations such that the printing material web can be printed in first sections exclusively by the first subseparation of the first printing form, that the printing substrate web can be printed in second sections exclusively by the second subseparation of the second printing form, and that the printing material web in third sections of the first sub-separation of the first printing form and the second sub-separation of the second printing form overlapping can be printed, so that between the subseparations of each ink no hard, edge-like transition, but rather a soft, running transition in Printed image exists.
  • the total separation of the respective printing ink is divided among the subsections in such a way that the first subseparation in the first sections of the printing material web for the respective printing ink 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate web , which can also be printed on the printing substrate with the help of the second subseparations in the second sections of the printing substrate for the respective ink 100% area fraction of the respective area coverage of the respective ink, and that in the third sections of the printing material with the first part separation, a position-dependent first surface portion the respective area coverage and the second subseparation a position-dependent second area ratio of the respective area coverage of the respective ink can be printed on the substrate web.
  • an embodiment in which the Bacseparation is distributed to the subseparations that in the third sections of the printing substrate with the first area portion of the first subseparation and the second area portion of the second subseparation in at least some positions, preferably at each position, the third Sections of the substrate web in total overfilling more than 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate, because in this way a particularly advantageous, high-quality seamless or seamless endless or variable format printing of the substrate in offset printing is possible.
  • the printing material web in the first sections is printed exclusively by the first partial separation of the first printing form.
  • the second subsections of the printing material web it is printed exclusively by the second subseparation of the second printing form.
  • the third sections of the printing material web is printed the same overlapping or superimposed by two subseparations of the two printing plates, preferably overfilling.
  • the total separation of the respective printing ink is preferably divided in such a way on the subseparations of the respective printing ink, that in the third sections of the printing substrate, in which overlapping or superimposed printed with two subseparations, the position-dependent first area portion of the first subseparation at the respective area coverage and the Position-dependent second area portion of the second subseparation at the respective area coverage is represented by a gradient, so that then depending on the gradient, the area proportions change continuously.
  • the total separation of the respective printing ink is divided in such a way on the subseparations of the respective printing ink, that in the third sections of the printing material starting from the first sections of the printing material in the direction of the second sections of the printing substrate, the area fraction of the first subseparation of a first portion decreases to a second portion and the surface portion of the second subseparation increases from the second portion to the first portion, whereas in the third portions of the printing material starting from the second portions thereof towards the first portions thereof the area fraction of the second subseparation of the first share decreases to the second share and the area proportion of the first partial separation increases from the second share to the first share.
  • the first portion is usually 100%, but can be designed depending on the subject, substrate, etc. also less than 100%, for example 80%.
  • the second fraction is usually 0%, but depending on the subject and / or printing material, it may also be greater than 0%, for example up to about 20%, without making the transition visually recognizable. These transitions are preferably configured continuously, for example in the form of a linear or parabolic or other gradient.
  • a first alternative to the tonal value correction of tone value fluctuations can be provided that for the first sections and the second sections of the printing material in which the subseparations do not overlap, no tonal correction is performed, however, that for the third sections of the printing material in which the Superimpose partial separations in the printing, position-dependent tonal correction is carried out in such a way that the tonal value correction in the form of a Tonwerterhöhung is greatest at those positions of the third sections to which the surface portions of the subseparations are most similar.
  • the tonal increase is greatest at those positions at which both partial separations provide in each case approximately 50% area fraction at the respective area coverage of the respective printing ink.
  • the tonal value correction can take place such that a tonal value reduction takes place for the first and second sections in which the partial separations do not overlap.
  • a position dependent tone reduction is performed, such that the tone reduction is lowest at those positions to which the surface portions of the subseparations are most similar.
  • the offset printing plates for the seamless or seamless endless or variable format printing of a printing substrate are prepared such that for each ink to be printed Retroabsparation the respective ink is provided, which is greater than the circumferential extent of the forme cylinder is, on which the printing forms are to be placed for printing.
  • the circumferential extent of the total separation of the respective printing ink is 50% longer than the cylinder circumference of the forme cylinder.
  • the total separation then has a length corresponding to 150% of the cylinder circumference of the forme cylinder used for printing.
  • the division of the surface portions of thePolseparation takes place on the subseparations after the screening of thePolseparation. If the partial separations are printed in register, it is ensured that the grid system used, including the local position of the halftone dots, is retained without restriction in the printed image of the finished printed product, despite the division of the overall separation into partial separations.
  • each ink is rasterized to a so-called primary grid for this purpose, in which case a non-periodic screening or a periodic screening can be used.
  • the rasterized total separation of each ink is stored.
  • the rastered total separation forms a primary grid.
  • Tonwertkorrektur namely, as described above, to compensate for in the superimposition of
  • This tonal correction preferably takes place weighted in a location-dependent manner, wherein the tonal value correction preferably has its maximum effect in those areas of the partial separations in which the partial separations develop the maximum superimposition in the pressure.
  • a so-called alpha channel is used for this tonal value correction in order to mask the still unscreened total separation of the respective printing ink for tonal value correction.
  • the corresponding tonwertkorrigêttechnischseparation is then rastered below again to form the primary grid.
  • the rastered total separation of each ink with the help of a secondary grid whose raster frequency is lower than the raster frequency of the primary grid or its point size greater than the dot size of the primary grid is divided into screened subseparations for the respective ink.
  • a so-called overlay mask is provided, which defines the overlapping or overlapping of the subseparations in the third sections, wherein this overlay mask is screened to form the secondary grid, namely via a non-periodic or a periodic screening.
  • Primary grid and secondary grid can each be both periodic or both non-periodic.
  • the raster frequency of the primary raster is higher than the raster frequency of the secondary raster.
  • the primary grid may be periodic and the secondary grid non-periodic or conversely the primary grid non-periodic and the secondary grid periodic.
  • the secondary grid is coarser than the primary grid.
  • the primary grid is superimposed with the secondary grid, preferably erased.
  • the primary grid is superimposed with the inverted secondary grid, in particular erased. Subsequently, the two screened subseparations are present for the respective printing ink, which have the length of the total separation.
  • the length of the subseparations is subsequently limited to the length of the peripheral extent of the printing plates, preferably such that when the length of the overall separation is 50% greater than the circumferential extent of the forme cylinder used for printing, both subsections are one by one compared to the overall separation Third, namely the first subseparation relative to a first end of the total separation and the second subseparation relative to an opposite second end of the total separation.
  • each ink is subsequently used to expose the printing plates so as ultimately to provide the printing plates for the seamless offset printing.
  • the order of the individual steps can also be varied.
  • the tonal correction can be done before the screening of the total separation of the respective printing ink or after the screening of the total separation of the respective printing ink.
  • the printing plates produced with the aid of the method according to the invention are typically printing plates which are positioned for free printing on a printing material web with a seamless continuous or format-variable printed image on corresponding form cylinders of a web-fed printing press.
  • the printing plates, the printing material superimposed overlap or printing on each printing ink, are preferably arranged on form cylinders that print rotated by 180 ° to each other, in which therefore the clamping channels for receiving the printing plates are offset by 180 ° to each other.
  • a printing material web with high quality can be printed seamlessly or in a format-variable manner without seams or transition.
  • the apparatus for producing the offset printing plates using the method according to the invention is a prepress apparatus having means for automatically or automatically carrying out the method, namely software modules implemented by software, with the aid of which the total separation of each print ferns to the above-described Art can be divided automatically or automatically to the subseparations.
  • the total separation per ink divided into subseparations then replenishes to form the total separation, resulting in a seamless or endless print product during printing.
  • the transition between the subseparations is overlapping, that is not hard in the sense of a smooth or stepped, but at the latest in the case of register deviations emerging optically perceptible edge but rather soft merging into each other.
  • the offset printing it is possible to print in high quality seamless or seamlessly continuous or format-variable printing.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Druckformen, die dem Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen bzw. formatvariablen Druckbild im Offsetdruck dienen, nach dem Oberbegriff des Anspruchs 1. Weiterhin betrifft die Erfindung ein Verfahren zum Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen bzw. formatvariablen Druckbild, welches aus mindestens zwei Druckformen zugesammengesetzt wird, im Offsetdruck unter Verwendung solcher Druckformen.The invention relates to a method for producing printing forms, which serve the printing of a printing material web with a seamless transition or seamless variable format image in offset printing, according to the preamble of claim 1. Furthermore, the invention relates to a method for printing a printing substrate with a seamless or transitionless endless or format-variable printed image, which is gesgesammengesetzt from at least two printing forms, in offset printing using such printing forms.

Es besteht zunehmend Bedarf am Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen Druckbild, um zum Beispiel Verpackungen, Tapeten oder Geschenkpapieren herzustellen.There is an increasing demand for printing on a printing material web with a seamless continuous print image, for example to produce packaging, wallpapers or gift papers.

Im Offsetdruck ist das Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen bzw. formatvariablem Druckbild bislang nur in unzureichendem Maße möglich, da zum Offsetdruck Druckformen verwendet werden, die eine definierte Länge und/oder darüber hinaus einen druckfreien Bereich, der für die Vorrichtung zur Befestigung der Druckform auf dem Druckformzylinder, üblicherweise als Spannkanal bezeichnet, aufweisen und demnach auf dem Bedruckstoff beim Drucken einen druckfreien Bereich hinterlassen. Soll demnach im Offsetdruck mit Druckformen, die eine begrenzte Länge und/oder einen druckfreien Bereich aufweisen, nahtlos endlos bzw. formatvariabel gedruckt werden, so muss für jede zu druckende Druckfarbe des Druckbilds eine Gesamtseparation der jeweiligen Druckfarbe auf mindestens zwei Druckformen aufgeteilt werden, so dass mit einer ersten Druckform eine erste Teilseparation der Gesamtseparation der jeweiligen Druckfarbe und mit einer zweiten Druckform eine zweite Teilseparation der Gesamtseparation der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt werden kann.In offset printing, the printing of a substrate web with a seam-free or seamless continuous or formatvariablem print image is so far only to an insufficient extent possible because the offset printing printing forms are used, the defined length and / or beyond a pressure-free area for the device for fastening the printing form on the printing form cylinder, commonly referred to as a clamping channel, and thus leave a pressure-free area on the substrate during printing. Accordingly, if in offset printing with printing forms which have a limited length and / or a print-free area, seamlessly or format-variable printing is required, an overall separation of the respective printing ink must be divided into at least two printing forms for each printing ink of the printed image to be printed, so that With a first printing form, a first partial separation of the total separation of the respective printing ink and with a second printing form a second partial separation of the total separation of the respective printing ink onto the printing material can be printed.

Hierbei ist nach der Praxis vorgesehen, dass die zweite Teilseparation der zweiten Druckform in diejenigen Bereiche bzw. Abschnitte der zu bedruckenden Bedruckstoffbahn druckt, die mit der ersten Teilseparation der ersten Druckform infolge der begrenzten Länge derselben nicht bedruckt werden können. Die zweite Teilseparation der zweiten Druckform füllt demnach die erste Teilseparation der ersten Druckform in den Bereichen auf, in welchen die erste Teilseparation der ersten Druckform den Bedruckstoff nicht bedrucken kann. Infolge von zum Beispiel Passerfehlern ist dies jedoch nur in unzureichendem Maße möglich, so dass im Offsetdruck ein naht- bzw. übergangsloser endloser bzw. formatvariabler Druck nur eingeschränkt möglich ist. Es besteht daher Bedarf an Druckformen, die im Offsetdruck einen nahtlosen bzw. endlosen Druck ohne wesentliche Qualitätseinschränkungen zulassen.In this case, it is provided in practice that the second subseparation of the second printing form prints in those regions or sections of the printing material web to be printed, which can not be printed with the first subseparation of the first printing form due to the limited length thereof. The second subseparation of the second printing form accordingly fills in the first subseparation of the first printing form in the regions in which the first subseparation of the first printing form can not print on the printing material. As a result of, for example, registration errors, however, this is only possible to an insufficient extent, so that in offset printing, seamless or seamless inputless or variable-format printing is only possible to a limited extent. There is therefore a need for printing forms that permit seamless or continuous printing in offset printing without significant quality restrictions.

DE 31 17 663 A1 offenbart ein naht- bzw. übergangsloses, endloses Bedrucken einer Bedruckstoffbahn mit Hilfe von zwei Druckformen, die teilweise überlappend den Bedruckstoff bedrucken. DE 31 17 663 A1 discloses a seamless or seamless, endless printing of a substrate web by means of two printing plates, which print partially overlapping the substrate.

DE 43 17 984 A1 offenbart ein weiteres Druckverfharen. DE 43 17 984 A1 discloses another Druckverfharen.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein neuartiges Verfahren zum Herstellen von Druckformen, die dem Bedrucken einer Bedruckstoffbahn mit einem nahtlosen endlosen bzw. formatvariablen Druckbild im Offsetdruck dienen, sowie ein entsprechendes Verfahren zum Bedrucken einer Bedruckstoffbahn mit einem nahtlosen endlosen bzw. formatvariablen Druckbild im Offsetdruck zu schaffen.On this basis, the present invention has the object, a novel method for producing printing forms, which are used to print a substrate web with a seamless endless or format variable image in offset printing, and a corresponding method for printing a substrate web with a seamless endless or formatvariablen To create print image in offset printing.

Diese Aufgabe wird durch ein Verfahren zum Herstellen von Druckformen gemäß Anspruch 1 gelöst.This object is achieved by a method for producing printing forms according to claim 1.

Mit der hier vorliegenden Erfindung wird vorgeschlagen, zum Drucken jeder zu druckenden Druckfarbe mehrere Druckformen bereitzuhalten, wobei die Gesamtseparation jeder Druckfarbe auf mehrere Teilseparationen und damit mehrere Druckformen aufgeteilt wird, und zwar derart, dass zwischen den Teilseparationen keine harte bzw. scharfe Übergangskante besteht, sondern vielmehr mit den Teilseparationen der Druckformen überlappend bzw. überlagert gedruckt wird. So wird die Gesamtseparation einer jeden Druckfarbe derart auf die Teilseparationen aufgeteilt, dass die Bedruckstoffbahn in den ersten Abschnitten ausschließlich von der ersten Teilseparation der ersten Druckform und in zweiten Abschnitten ausschließlich von der zweiten Teilseparation der zweiten Druckform bedruckt werden kann, wobei jedoch in dritten Abschnitten der Bedruckstoffbahn mit der ersten Teilseparation der ersten Druckform und der zweiten Teilseparation der zweiten Druckform überlappend bzw. überlagert gedruckt werden kann. Die Gesamtseparation der jeweiligen Druckfarbe wird derart auf die Teilseparationen der jeweiligen Druckfarbe aufgeteilt, dass mit Hilfe einer Tonwertkorrektur bei der Überlagerung der beiden Teilseparationen im Druck zu erwartende Tonwertschwankungen kompensiert werden, wobei die Tonwertkorrektur abhängig vom Grad der Überlagerung der beiden Teilseparationen erfolgt. Hierdurch kann im Offsetdruck nahtlos endlos bzw. formatvariabel mit hoher Qualität gedruckt werden.With the present invention, it is proposed to provide several printing plates for printing each printing ink to be printed, the total separation of each printing ink being subdivided into a plurality of subseparations and thus several printing forms in such a way that there is no hard or sharp transitional edge between the subseparations rather, it is printed overlapping or overlaid with the subseparations of the printing forms. Thus, the Gesamtseparation of each ink is divided into the subseparations, that the substrate web can be printed in the first sections exclusively from the first subseparation of the first printing form and in second sections exclusively from the second subseparation of the second printing form, however, in third sections of Substrate printing with the first subseparation of the first printing form and the second subseparation of the second printing form overlapping or superimposed can be printed. The total separation of the respective printing ink is subdivided into the subseparations of the respective printing ink in such a way that expected tone value fluctuations are compensated by means of a tone value correction in the superimposition of the two subseparations in the printing, wherein the tone value correction is effected depending on the degree of superposition of the two subseparations. As a result, in offset printing can be printed seamlessly endless or format variable with high quality.

In diesem Zusammenhang wird die Definition eines Flächenanteiles eingeführt. Dieser ist die Aufteilung des Druckbildes auf die am Druckprozess beteiligten mindestens zwei Druckformen. Somit bewegt sich der Flächenanteil in der Regel zwischen 0% und 100%, da eine Aufteilung von einem Druck- bzw. Bildpunkt auf mindestens zwei am Druck beteiligte Druckformen ansonsten eine Veränderung des optischen Eindruckes im Vergleich zum nicht aufgeteilten Druckbild darstellen und somit nicht zu einer identischen optischen Wiedergabe des ursprünglichen Druckbildes führen würde.In this context, the definition of an area ratio is introduced. This is the division of the print image on the involved in the printing process at least two printing plates. Thus, the area fraction usually moves between 0% and 100%, since a division of one printing or pixel onto at least two printing forms involved in the printing otherwise represent a change in the visual impression compared to the non-divided print image and thus not to a identical optical reproduction of the original print image would result.

Nach einer vorteilhaften Weiterbildung der Erfindung wird die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen aufgeteilt, dass die erste Teilseparation in den ersten Abschnitten der Bedruckstoffbahn für die jeweilige Druckfarbe 100% Flächenanteil der jeweiligen Flächendeckung bereitstellt, dass die zweite Teilseparation in den zweiten Abschnitten der Bedruckstoffbahn für die jeweilige Druckfarbe 100% Flächenanteil der jeweiligen Flächendeckung bereitstellt, und dass für die dritten Abschnitte der Bedruckstoffbahn die erste Teilseparation einen positionsabhängigen ersten Flächenanteil der jeweiligen Flächendeckung und die zweite Teilseparation einen positionsabhängigen zweiten Flächenanteil der jeweiligen Flächendeckung bereitstellt. Diese vorteilhafte Weiterbildung der Erfindung erlaubt ein hochqualitatives Drucken von Druckerzeugnissen mit einem nahtlosen endlosen bzw. formatvariablen Druckbild im Offsetdruck.According to an advantageous development of the invention, the total separation of the respective printing ink is divided among the subseparations in such a way that the first subseparation in the first sections of the printing material web provides 100% surface area of the respective area coverage for the respective printing ink that the second subseparation in the second sections of the printing material web provides for the respective ink 100% area fraction of the respective area coverage, and that for the third sections of the printing substrate, the first subseparation provides a position-dependent first area portion of the respective area coverage and the second subseparation a position-dependent second area portion of the respective area coverage. This advantageous development of the invention allows a high-quality printing of printed products with a seamless endless or format-variable printed image in offset printing.

Vorzugsweise wird die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen der jeweiligen Druckfarbe aufgeteilt, dass in den dritten Abschnitten der Bedruckstoffbahn mit dem ersten Flächenanteil der ersten Teilseparation und dem zweiten Flächenanteil der zweiten Teilseparation an zumindest einigen Positionen der dritten Abschnitte der Bedruckstoffbahn in Summe überfüllend mehr als 100% Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt werden kann. Alternativ wird die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen der jeweiligen Druckfarbe aufgeteilt wird, dass in den dritten Abschnitten der Bedruckstoffbahn mit dem ersten Flächenanteil der ersten Teilseparation und dem zweiten Flächenanteil der zweiten Teilseparation an jeder Position der dritten Abschnitte der Bedruckstoffbahn in Summe 100% Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt werden kann. Insbesondere dann, wenn in den dritten Abschnitten der Bedruckstoffbahn die beiden Teilseparationen derart ausgestaltet sind, dass mit denselben in den dritten Abschnitten überfüllend gedruckt werden kann, kann im Offsetdruck ein hochqualitativer nahtloser endloser bzw. formatvariabler Druck realisiert werden.The total separation of the respective printing ink is preferably subdivided into the subseparations of the respective printing ink such that in the third sections of the printing material web with the first area fraction of the first subseparation and the second area fraction of the second subseparation at least at some positions of the third sections of the printing material web in total overfilling as 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate. Alternatively, the total separation of the respective printing ink is divided into the subseparations of the respective printing ink in such a way that in the third sections of the printing material web with the first area fraction of the first subseparation and the second area fraction of the second subseparation at each position of the third sections of the printing substrate web 100% in total Area fraction of the respective area coverage of the respective printing ink can be printed on the substrate. In particular, when in the third sections of the printing material web, the two subseparations are designed such that they can be printed overfilling with the same in the third sections, a high quality seamless endless or variable format printing can be realized in offset printing.

Das erfindungsgemäße Verfahren zum Bedrucken einer Bedruckstoffbahn mit einem nahtlosen bzw. endlosen Druckbild nutzt die mit dem erfindungsgemäßen Druckformherstellungsverfahren hergestellten Druckformen.The method according to the invention for printing a printing material web with a seamless or endless printing image uses the printing forms produced by the printing plate production method according to the invention.

Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung.Preferred embodiments of the invention will become apparent from the dependent claims and the description below.

Die Erfindung betrifft ein Verfahren zum Herstellen von Druckformen, die dem Bedrucken einer Bedruckstoffbahn mit einem nahtlosen endlosen bzw. formatvariablen Druckbild im Offsetdruck dienen. Weiterhin betrifft die Erfindung eine Vorrichtung zur Herstellung solcher Druckformen sowie ein Verfahren zum Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen bzw. formatvariablen Druckbild im Offsetdruck unter Verwendung solcher Druckformen.The invention relates to a method for producing printing forms which serve for printing a printing material web with a seamless, endless or format-variable printed image in offset printing. Furthermore, the invention relates to a device for producing such printing plates and a method for printing a printing material web with a seamless transitionless or format variable printed image in offset printing using such printing forms.

Für jede im Offsetdruck beim naht- bzw. übergangslosen endlosen bzw. formatvariablen Bedrucken auf den Bedruckstoff aufzutragende Druckfarbe wird die Gesamtseparation der jeweiligen Druckfarbe auf mindestens zwei Druckformen aufgeteilt, so dass mit einer ersten Druckform eine erste Teilseparation der Gesamtseparation der jeweiligen Druckfarbe und mit einer zweiten Druckform eine zweiteThe total separation of the respective printing ink is subdivided into at least two printing forms for each printing ink to be applied in offset printing during seamless or format-variable printing on the printing substrate, so that a first partial printing of the total separation of the respective printing ink and of a second printing separation takes place with a first printing form Printing form a second

Teilseparation der Gesamtseparation der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt werden kann.Partial separation of the total separation of the respective printing ink can be printed on the substrate.

Die Gesamtseparation der jeweiligen Druckfarbe wird dabei erfindungsgemäß derart auf die Teilseparationen aufgeteilt, dass die Bedruckstoffbahn in ersten Abschnitten ausschließlich von der ersten Teilseparation der ersten Druckform bedruckt werden kann, dass die Bedruckstoffbahn in zweiten Abschnitten ausschließlich von der zweiten Teilseparation der zweiten Druckform bedruckt werden kann, und dass die Bedruckstoffbahn in dritten Abschnitten von der ersten Teilseparation der ersten Druckform und der zweiten Teilseparation der zweiten Druckform überlappend bzw. überlagernd bedruckt werden kann, so dass zwischen den Teilseparationen jeder Druckfarbe kein harter, kantenartiger Übergang, sondern vielmehr ein weicher, verlaufender Übergang im Druckbild besteht.According to the invention, the total separation of the respective printing ink is subdivided into the subseparations such that the printing material web can be printed in first sections exclusively by the first subseparation of the first printing form, that the printing substrate web can be printed in second sections exclusively by the second subseparation of the second printing form, and that the printing material web in third sections of the first sub-separation of the first printing form and the second sub-separation of the second printing form overlapping can be printed, so that between the subseparations of each ink no hard, edge-like transition, but rather a soft, running transition in Printed image exists.

Insbesondere wird bei der Herstellung der Offset-Druckformen die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen aufgeteilt, dass mit der ersten Teilseparation in den ersten Abschnitten der Bedruckstoffbahn für die jeweilige Druckfarbe 100 % Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf die Bedruckstoffbahn gedruckt werden kann, das mit Hilfe der zweiten Teilseparationen in den zweiten Abschnitten der Bedruckstoffbahn ebenfalls für die jeweilige Druckfarbe 100 % Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf die Bedruckstoffbahn gedruckt werden kann, und dass in den dritten Abschnitten der Bedruckstoffbahn mit der ersten Teilseparation ein positionsabhängiger erster Flächenanteil der jeweiligen Flächendeckung und mit der zweiten Teilseparation ein positionsabhängiger zweiter Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf die Bedruckstoffbahn gedruckt werden kann.In particular, in the production of the offset printing plates, the total separation of the respective printing ink is divided among the subsections in such a way that the first subseparation in the first sections of the printing material web for the respective printing ink 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate web , Which can also be printed on the printing substrate with the help of the second subseparations in the second sections of the printing substrate for the respective ink 100% area fraction of the respective area coverage of the respective ink, and that in the third sections of the printing material with the first part separation, a position-dependent first surface portion the respective area coverage and the second subseparation a position-dependent second area ratio of the respective area coverage of the respective ink can be printed on the substrate web.

Dabei kann vorgesehen sein, dass in den dritten Abschnitten der Bedruckstoffbahn mit dem ersten Flächenanteil der ersten Teilseparation und dem zweiten Flächenanteil der zweiten Teilseparation an jeder Position der dritten Abschnitte der Bedruckstoffbahn in Summe jeweils 100 % Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt wird.It can be provided that in the third sections of the printing material web with the first surface portion of the first subseparation and the second Area proportion of the second subseparation at each position of the third sections of the substrate web in total 100% area fraction of the respective area coverage of the respective printing ink is printed on the substrate.

Bevorzugt ist jedoch eine Ausgestaltung, in welcher die Gesamtseparation derart auf die Teilseparationen aufgeteilt wird, dass in den dritten Abschnitten der Bedruckstoffbahn mit dem ersten Flächenanteil der ersten Teilseparation und dem zweiten Flächenanteil der zweiten Teilseparation an zumindest einigen Positionen, vorzugsweise an jeder Position, der dritten Abschnitte der Bedruckstoffbahn in Summe überfüllend mehr als 100 % Flächenanteil der jeweiligen Flächendeckung der jeweiligen Druckfarbe auf den Bedruckstoff gedruckt werden kann, weil hierdurch ein besonders vorteilhafter, hochqualitativer naht- bzw. übergangsloser endloser bzw. formatvariabler Bedruck der Bedruckstoffbahn im Offsetdruck möglich ist.However, an embodiment in which the Gesamtseparation is distributed to the subseparations, that in the third sections of the printing substrate with the first area portion of the first subseparation and the second area portion of the second subseparation in at least some positions, preferably at each position, the third Sections of the substrate web in total overfilling more than 100% area fraction of the respective area coverage of the respective printing ink can be printed on the substrate, because in this way a particularly advantageous, high-quality seamless or seamless endless or variable format printing of the substrate in offset printing is possible.

Aus den obigen Zusammenhängen folgt demnach, dass die Bedruckstoffbahn in den ersten Abschnitten ausschließlich von der ersten Teilseparation der ersten Druckform bedruckt wird. In den zweiten Teilabschnitten der Bedruckstoffbahn wird dieselbe ausschließlich von der zweiten Teilseparation der zweiten Druckform bedruckt. In den dritten Abschnitten der Bedruckstoffbahn wird dieselbe überlappend bzw. überlagert von beiden Teilseparationen der beiden Druckformen bedruckt, und zwar vorzugsweise überfüllend.From the above contexts it follows that the printing material web in the first sections is printed exclusively by the first partial separation of the first printing form. In the second subsections of the printing material web, it is printed exclusively by the second subseparation of the second printing form. In the third sections of the printing material web is printed the same overlapping or superimposed by two subseparations of the two printing plates, preferably overfilling.

Die Gesamtseparation der jeweiligen Druckfarbe wird dabei vorzugsweise derart auf die Teilseparationen der jeweiligen Druckfarbe aufgeteilt, dass in den dritten Abschnitten der Bedruckstoffbahn, in welchen mit beiden Teilseparationen überlappend bzw. überlagert gedruckt wird, der positionsabhängige erste Flächenanteil der ersten Teilseparation an der jeweiligen Flächendeckung und der positionsabhängige zweite Flächenanteil der zweiten Teilseparation an der jeweiligen Flächendeckung über einen Gradienten abgebildet wird, so dass sich dann abhängig vom Gradienten die Flächenanteile kontinuierlich ändern.The total separation of the respective printing ink is preferably divided in such a way on the subseparations of the respective printing ink, that in the third sections of the printing substrate, in which overlapping or superimposed printed with two subseparations, the position-dependent first area portion of the first subseparation at the respective area coverage and the Position-dependent second area portion of the second subseparation at the respective area coverage is represented by a gradient, so that then depending on the gradient, the area proportions change continuously.

So kann vorgesehen sein, dass die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen der jeweiligen Druckfarbe aufgeteilt wird, dass in den dritten Abschnitten der Bedruckstoffbahn ausgehend von den ersten Abschnitten der Bedruckstoffbahn in Richtung auf die zweiten Abschnitte der Bedruckstoffbahn der Flächenanteil der ersten Teilseparation von einem ersten Anteil auf einen zweiten Anteil abnimmt und der Flächenanteil der zweiten Teilseparation von dem zweiten Anteil auf den ersten Anteil zunimmt, wohingegen in den dritten Abschnitten der Bedruckstoffbahn ausgehend von den zweiten Abschnitten derselben in Richtung auf die ersten Abschnitte derselben der Flächenanteil der zweiten Teilseparation von dem ersten Anteil auf den zweiten Anteil abnimmt und der Flächenanteil der ersten Teilseparation von dem zweiten Anteil auf den ersten Anteil zunimmt. Der erste Anteil beträgt üblicherweise 100%, kann aber abhängig vom Sujet, Bedruckstoff etc. auch kleiner 100%, beispielsweise 80% gestaltet werden. Der zweite Anteil beträgt üblicherweise 0%, kann aber in Abhängigkeit von Sujet und/oder Bedruckstoff auch größer 0%, beispielsweise bis ca. 20% ausgeführt werden, ohne den Übergang visuell erkennbar zu gestalten. Diese Übergänge werden vorzugsweise kontinuierlich ausgestaltet, zum Beispiel in Form eines linearen oder parabolischen oder sonstigen Gradienten.Thus, it can be provided that the total separation of the respective printing ink is divided in such a way on the subseparations of the respective printing ink, that in the third sections of the printing material starting from the first sections of the printing material in the direction of the second sections of the printing substrate, the area fraction of the first subseparation of a first portion decreases to a second portion and the surface portion of the second subseparation increases from the second portion to the first portion, whereas in the third portions of the printing material starting from the second portions thereof towards the first portions thereof the area fraction of the second subseparation of the first share decreases to the second share and the area proportion of the first partial separation increases from the second share to the first share. The first portion is usually 100%, but can be designed depending on the subject, substrate, etc. also less than 100%, for example 80%. The second fraction is usually 0%, but depending on the subject and / or printing material, it may also be greater than 0%, for example up to about 20%, without making the transition visually recognizable. These transitions are preferably configured continuously, for example in the form of a linear or parabolic or other gradient.

Nach einer vorteilhaften Weiterbildung der Erfindung ist vorgesehen, die Gesamtseparation der jeweiligen Druckfarbe derart auf die Teilseparationen der jeweiligen Druckfarbe aufzuteilen, dass mit einer Tonwertkorrektur bei der Überlagerung der beiden Teilseparationen im Druck zu erwartende Tonwertschwankungen kompensiert werden, wobei die Tonwertkorrektur abhängig von Druck der Überlagerung der beiden Teilseparationen erfolgt.According to an advantageous development of the invention, it is provided to divide the total separation of the respective printing ink onto the subseparations of the respective printing ink in such a way that expected tonal fluctuations are compensated with a tonal correction in the superimposition of the two subseparations in the printing, wherein the tonal correction depends on the superimposition of the ink both partial separations takes place.

So kann einer ersten Alternative zur Tonwertkorrektur von Tonwertschwankungen vorgesehen sein, dass für die ersten Abschnitte und die zweiten Abschnitte der Bedruckstoffbahn, in welchen sich die Teilseparationen nicht überlagern, keine Tonwertkorrektur durchgeführt wird, dass hingegen für die dritten Abschnitte der Bedruckstoffbahn, in welchen sich die Teilseparationen beim Druck überlagern, eine positionsabhängige Tonwertkorrektur durchgeführt wird, und zwar derart, dass die Tonwertkorrektur in Form einer Tonwerterhöhung an solchen Positionen der dritten Abschnitte am größten ist, an welchen die Flächenanteile der Teilseparationen am ähnlichsten sind. Vorzugsweise ist die Tonwerterhöhung an solchen Positionen am größten, an welchen beide Teilseparationen jeweils in etwa 50 % Flächenanteil an der jeweiligen Flächendeckung der jeweiligen Druckfarbe bereitstellen.Thus, a first alternative to the tonal value correction of tone value fluctuations can be provided that for the first sections and the second sections of the printing material in which the subseparations do not overlap, no tonal correction is performed, however, that for the third sections of the printing material in which the Superimpose partial separations in the printing, position-dependent tonal correction is carried out in such a way that the tonal value correction in the form of a Tonwerterhöhung is greatest at those positions of the third sections to which the surface portions of the subseparations are most similar. Preferably, the tonal increase is greatest at those positions at which both partial separations provide in each case approximately 50% area fraction at the respective area coverage of the respective printing ink.

Nach einer Alternative kann die Tonwertkorrektur derart erfolgen, dass für die ersten und zweiten Abschnitte, in welchen sich die Teilseparationen nicht überlagern, eine Tonwertreduzierung erfolgt. Für die dritten Abschnitte, in welchen sich die Teilseparationen überlagern, wird eine positionsabhängige Tonwertreduzierung durchgeführt, und zwar derart, dass die Tonwertreduzierung an solchen Positionen am geringsten ist, an welchen die Flächenanteile der Teilseparationen am ähnlichsten sind.According to an alternative, the tonal value correction can take place such that a tonal value reduction takes place for the first and second sections in which the partial separations do not overlap. For the third sections, in which the subseparations overlap, a position dependent tone reduction is performed, such that the tone reduction is lowest at those positions to which the surface portions of the subseparations are most similar.

Nach einer besonders vorteilhaften Ausgestaltung der Erfindung werden die Offset-Druckformen für den naht- bzw. übergangslosen endlosen bzw. formatvariablen Bedruck einer Bedruckstoffbahn derart hergestellt, dass für jede zu druckende Druckfarbe eine Gesamtseparation der jeweiligen Druckfarbe bereitgestellt wird, die größer als die Umfangserstreckung der Formzylinder ist, auf welchen die Druckformen für das Drucken zu platzieren sind.According to a particularly advantageous embodiment of the invention, the offset printing plates for the seamless or seamless endless or variable format printing of a printing substrate are prepared such that for each ink to be printed Gesamtabsparation the respective ink is provided, which is greater than the circumferential extent of the forme cylinder is, on which the printing forms are to be placed for printing.

Vorzugsweise ist die Umfangserstreckung der Gesamtseparation der jeweiligen Druckfarbe um 50 % länger als der Zylinderumfang der Formzylinder. Die Gesamtseparation verfügt dann über eine Länge, die 150 % des Zylinderumfangs der zum Drucken verwendeten Formzylinder entspricht.Preferably, the circumferential extent of the total separation of the respective printing ink is 50% longer than the cylinder circumference of the forme cylinder. The total separation then has a length corresponding to 150% of the cylinder circumference of the forme cylinder used for printing.

Nach einer weiteren, besonders vorteilhaften Ausgestaltung der Erfindung erfolgt die Aufteilung der Flächenanteile der Gesamtseparation auf die Teilseparationen nach der Rasterung der Gesamtseparation. Werden die Teilseparationen passergenau abgedruckt wird so gewährleistet, dass das verwendete Rastersystem einschließlich der örtlichen Lage der Rasterpunkte zueinander im Druckbild des fertigen Druckprodukts trotz Aufteilung der Gesamtseparation auf Teilseparationen uneingeschränkt erhalten bleibt.According to a further, particularly advantageous embodiment of the invention, the division of the surface portions of the Gesamtseparation takes place on the subseparations after the screening of the Gesamtseparation. If the partial separations are printed in register, it is ensured that the grid system used, including the local position of the halftone dots, is retained without restriction in the printed image of the finished printed product, despite the division of the overall separation into partial separations.

In einer vorteilhaften Ausgestaltung der Erfindung wird hierfür die Gesamtseparation jeder Druckfarbe zu einem sogenannten Primärraster gerastert, wobei hierbei eine nicht-periodische Rasterung oder eine periodische Rasterung zum Einsatz kommen kann. Die gerasterte Gesamtseparation jeder Druckfarbe wird gespeichert. Die gerasterte Gesamtseparation bildet ein Primärraster.In an advantageous embodiment of the invention, the Gesamtseparation each ink is rasterized to a so-called primary grid for this purpose, in which case a non-periodic screening or a periodic screening can be used. The rasterized total separation of each ink is stored. The rastered total separation forms a primary grid.

Vorzugsweise erfolgt vor der Rasterung der noch ungerasterten Gesamtseparation eine Tonwertkorrektur, und zwar, wie oben beschrieben, zur Kompensation von sich bei der Überlagerung der Teilseparation im Druck ausbildenden Tonwertschwankungen. Diese Tonwertkorrektur erfolgt vorzugsweise ortsabhängig gewichtet, wobei die Tonwertkorrektur vorzugsweise ihre maximale Wirkung in denjenigen Bereichen der Teilseparationen hat, in welchen die Teilseparationen die maximale Überlagerung im Druck entfalten. Nach einer vorteilhaften Ausgestaltung wird zu dieser Tonwertkorrektur ein sogenannter Alphakanal genutzt, um die noch ungerasterte Gesamtseparation der jeweiligen Druckfarbe zur Tonwertkorrektur zu maskieren. Die entsprechend tonwertkorrigierte Gesamtseparation wird dann nachfolgend wiederum unter Ausbildung des Primärrasters gerastert.Preferably, before the rasterization of the still unscreened Gesamtseparation a Tonwertkorrektur, namely, as described above, to compensate for in the superimposition of Teilseparation in pressure forming Tonwertschwankungen. This tonal correction preferably takes place weighted in a location-dependent manner, wherein the tonal value correction preferably has its maximum effect in those areas of the partial separations in which the partial separations develop the maximum superimposition in the pressure. According to an advantageous embodiment, a so-called alpha channel is used for this tonal value correction in order to mask the still unscreened total separation of the respective printing ink for tonal value correction. The corresponding tonwertkorrigierte Gesamtseparation is then rastered below again to form the primary grid.

Nach der vorteilhaften Ausgestaltung wird nachfolgend die gerasterte Gesamtseparation einer jeden Druckfarbe mit Hilfe eines Sekundärrasters, dessen Rasterfrequenz niedriger als die Rasterfrequenz des Primärrasters bzw. dessen Punktgröße größer als die Punktgröße des Primärraster ist, in gerasterte Teilseparationen für die jeweilige Druckfarbe aufgeteilt. Hierzu wird zunächst vorzugsweise eine sogenannte Überlagerungsmaske bereitgestellt, welche die Überlagerung bzw. Überlappung der Teilseparationen in den dritten Abschnitten definiert, wobei diese Überlagerungsmaske unter Ausbildung des Sekundärrasters gerastert wird, nämlich über eine nicht-periodische oder eine periodische Rasterung.According to the advantageous embodiment, the rastered total separation of each ink with the help of a secondary grid, whose raster frequency is lower than the raster frequency of the primary grid or its point size greater than the dot size of the primary grid is divided into screened subseparations for the respective ink. For this purpose, preferably a so-called overlay mask is provided, which defines the overlapping or overlapping of the subseparations in the third sections, wherein this overlay mask is screened to form the secondary grid, namely via a non-periodic or a periodic screening.

Primärraster und Sekundärraster können jeweils beide periodisch oder beide nicht-periodisch sein. Insbesondere dann, wenn beide Raster periodisch sind, ist die Rasterfrequenz des Primärrasters höher als die Rasterfrequenz des Sekundärrasters. Ferner kann das Primärraster periodisch und des Sekundärraster nicht-periodisch oder umgekehrt das Primärraster nicht-periodisch und des Sekundärraster periodisch sein. In jedem Fall ist das Sekundärraster gröber als das Primärraster.Primary grid and secondary grid can each be both periodic or both non-periodic. In particular, when both rasters are periodic, the raster frequency of the primary raster is higher than the raster frequency of the secondary raster. Furthermore, the primary grid may be periodic and the secondary grid non-periodic or conversely the primary grid non-periodic and the secondary grid periodic. In any case, the secondary grid is coarser than the primary grid.

Zur Erzeugung der ersten Teilseparation wird das Primärraster mit dem Sekundärraster überlagert, vorzugsweise gelöscht. Zur Erzeugung der zweiten Teilseparation wird das Primärraster mit dem invertierten Sekundärraster überlagert, insbesondere gelöscht. Anschließend liegen für die jeweilige Druckfarbe die beiden gerasterten Teilseparationen vor, die die Länge der Gesamtseparation aufweisen.To generate the first subseparation, the primary grid is superimposed with the secondary grid, preferably erased. To generate the second subseparation, the primary grid is superimposed with the inverted secondary grid, in particular erased. Subsequently, the two screened subseparations are present for the respective printing ink, which have the length of the total separation.

Die Länge der Teilseparationen wird nachfolgend auf die Länge der Umfangserstreckung der Druckformen begrenzt, und zwar vorzugsweise derart, dass dann, wenn die Länge der Gesamtseparation um 50 % größer als die Umfangserstreckung der zum Drucken verwendeten Formzylinder ist, beide Teilseparationen gegenüber der Gesamtseparation um jeweils ein Drittel gekürzt werden, nämlich die erste Teilseparation bezogen auf ein erstes Ende der Gesamtseparation und die zweite Teilseparation bezogen auf ein gegenüberliegendes zweites Ende der Gesamtseparation.The length of the subseparations is subsequently limited to the length of the peripheral extent of the printing plates, preferably such that when the length of the overall separation is 50% greater than the circumferential extent of the forme cylinder used for printing, both subsections are one by one compared to the overall separation Third, namely the first subseparation relative to a first end of the total separation and the second subseparation relative to an opposite second end of the total separation.

Die so bereitgestellten Teilseparationen für jede Druckfarbe werden nachfolgend zur Belichtung der Druckplatten verwendet, um so letztendlich die Druckplatten für den naht- bzw. übergangslosen endlosen bzw. formatvariablen Offset-Druck bereitzustellen.The subseparations thus provided for each ink are subsequently used to expose the printing plates so as ultimately to provide the printing plates for the seamless offset printing.

Obwohl die oben beschriebene Reihenfolge der einzelnen Schritte zur Herstellung der Offset-Druckformen für den naht- bzw. übergangslosen endlosen bzw. formatvariablen Bedruck einer Bedruckstoffbahn bevorzugt ist, kann die Reihenfolge der einzelnen Schritte auch variiert werden. So kann die Tonwertkorrektur vor der Rasterung der Gesamtseparation der jeweiligen Druckfarbe oder auch nach der Rasterung der Gesamtseparation der jeweiligen Druckfarbe erfolgen.Although the above-described sequence of the individual steps for producing the offset printing forms for the seamless or variable-format printing of a printing material web is preferred, the order of the individual steps can also be varied. Thus, the tonal correction can be done before the screening of the total separation of the respective printing ink or after the screening of the total separation of the respective printing ink.

Ferner ist es möglich, bei der Ausbildung der Teilseparationen das Primärraster vor der Überlagerung mit dem Sekundärraster bzw. invertierten Sekundärraster in der Länge auf die Länge der Umfangserstreckung der herzustellenden Druckform zu begrenzen.Furthermore, it is possible to limit the length of the primary grid before the superposition with the secondary grid or inverted secondary grid in the length to the length of the circumferential extent of the printing forme to be produced in the formation of the subseparations.

Bei den mit Hilfe des erfindungsgemäßen Verfahrens hergestellten Druckformen handelt es sich typischerweise um Druckplatten, die zum freien Bedrucken einer Bedruckstoffbahn mit einem naht- bzw. übergangslosen endlosen bzw. formatvariablen Druckbild auf entsprechenden Formzylindern einer Rollendruckmaschine positioniert werden.The printing plates produced with the aid of the method according to the invention are typically printing plates which are positioned for free printing on a printing material web with a seamless continuous or format-variable printed image on corresponding form cylinders of a web-fed printing press.

Die Druckformen, die je Druckfarbe den Bedruckstoff überlagernd bzw. überlappend bedrucken, werden dabei vorzugsweise auf Formzylindern angeordnet, die um 180° zueinander verdreht drucken, bei denen also die Spannkanäle zur Aufnahme der Druckplatten um 180° zueinander versetzt sind. Unter Verwendung der erfindungsgemäß hergestellten Druckformen kann eine Bedruckstoffbahn mit hoher Qualität naht- bzw. übergangslos endlos bzw. formatvariabel bedruckt werden.The printing plates, the printing material superimposed overlap or printing on each printing ink, are preferably arranged on form cylinders that print rotated by 180 ° to each other, in which therefore the clamping channels for receiving the printing plates are offset by 180 ° to each other. Using the printing plates produced according to the invention, a printing material web with high quality can be printed seamlessly or in a format-variable manner without seams or transition.

Bei der Vorrichtung zur Herstellung der Offset-Druckformen unter Verwendung des erfindungsgemäßen Verfahrens handelt es sich um eine Druckvorstufenvorrichtung, die Mittel zur automatischen bzw. automatisierten Durchführung des Verfahrens aufweist, nämlich softwareseitig implementierte Funktionsmodule, mit Hilfe derer die Gesamtseparation einer jeden Druckfarne auf die oben beschriebene Art und Weise automatisch bzw. automatisiert auf die Teilseparationen aufgeteilt werden kann.The apparatus for producing the offset printing plates using the method according to the invention is a prepress apparatus having means for automatically or automatically carrying out the method, namely software modules implemented by software, with the aid of which the total separation of each print ferns to the above-described Art can be divided automatically or automatically to the subseparations.

Wie oben bereits ausgeführt, ergänzt sich beim Drucken demnach die je Druckfarbe auf Teilseparationen aufgeteilte Gesamtseparation wieder zur Gesamtseparation, so dass sich ein nahtloses bzw. endloses Druckprodukt beim Drucken ergibt. Der Übergang zwischen den Teilseparationen ist überlappend, also nicht hart im Sinne einer glatten oder gestuften, sich spätestens im Falle von Registerabweichungen abzeichnenden optisch wahrnehmbaren Kante sondern vielmehr weich ineinander übergehend. Hierdurch kann mit dem Offset-Druck hochqualitativ naht- bzw. übergangslos endlos bzw. formatvariabel gedruckt werden.As already explained above, when printing, the total separation per ink divided into subseparations then replenishes to form the total separation, resulting in a seamless or endless print product during printing. The transition between the subseparations is overlapping, that is not hard in the sense of a smooth or stepped, but at the latest in the case of register deviations emerging optically perceptible edge but rather soft merging into each other. As a result, with the offset printing, it is possible to print in high quality seamless or seamlessly continuous or format-variable printing.

Claims (13)

  1. A method for producing printing formes, which serve for the printing of a printing material web with a seamless or transitionless, respectively, endless or format-variable print image, respectively, in offset printing, wherein a total separation of the respective print color is divided among at least two printing formes for each print color of the print image to be printed, so that with a first printing forme, a first partial separation of the total separation of the respective print color and with a second printing forme, a second partial separation of the total separation of the respective print color can be printed onto the printing material, wherein the total separation of the respective print color is divided among the partial separations in such a manner that the printing material web in first portions can be printed exclusively by the first partial separation of the first printing forme, that the printing material web in second portions can be printed exclusively by the second partial separation of the second printing forme, and that the printing material web in third portions can be printed in an overlapping or overlaying manner, respectively, by the first partial separation of the first printing forme and by the second partial separation of the second printing forme, characterized in that the total separation of the respective print color is divided among the partial separations of the respective print color in such a manner that, with the help of a tonal value correction during the overlaying of the two partial separations, tonal value fluctuations to be expected during printing are compensated, wherein the tonal value correction is performed as a function of the degree of the overlaying of the two partial separations.
  2. The method according to claim 1, characterized in that the total separation of the respective print color is divided among the partial separations in such a manner that the first partial separation for the first portions of the printing material web provides approximately 100 % area proportion of the respective area coverage for the respective print color, that the second partial separation for the second portions of the printing material web provides approximately 100 % area proportion of the respective area coverage for the respective print color, and that the first partial separation provides a position-dependent first area proportion of the respective area coverage for the third portions of the printing material web and the second partial separation provides a position-dependent second area proportion of the respective area coverage.
  3. The method according to claim 1 or 2, characterized in that the total separation of the respective print color is divided among the partial separations of the respective print color in such a manner that in the third portions of the printing material web with the first area proportion of the first partial separation and the second area proportion of the second partial separation, in total maximally 100 % area proportion of the respective area coverage of the respective print color can be printed onto the printing material in every position of the third portions of the printing material web.
  4. The method according to claim 1 or 2, characterized in that the total separation of the respective print color is distributed among the partial separations of the respective print color in such a manner that in the third portions of the printing material web with the first area proportion of the first partial separation, and the second area proportion of the second partial separation, in total more than 100 % area proportion of the respective area coverage of the respective print color can be printed onto the printing material in at least some positions of the third portions of the printing material web in an overfilling manner.
  5. The method according to one of claims 1 to 4, characterized in that the total separation of the respective print color is divided among the partial separations of the respective print color in such a manner that the position-dependent first area proportion of the first partial separation for the third portions of the printing material web is depicted at the respective area coverage and the position-dependent second area proportion of the second partial separation is depicted at the respective area coverage, in each case via a gradient.
  6. The method according to one of claims 1 to 5, characterized in that the total separation of the respective print color is divided among the partial separations of the respective print color in such a manner that in the third portions of the printing material web starting out from the first portions of the printing material web in the direction of the second portions of the printing material web, the area proportion of the first partial separation decreases from a first proportion to a second proportion and the area proportion of the second partial separation increases from the second proportion to the first proportion, whereas in the third portions of the printing material web starting out from the second portions of the printing material web in the direction of the first portions of the printing material web, the area proportion of the second partial separation decreases from the first proportion to the second proportion and the area proportion of the first partial separation increases from the second proportion to the first proportion.
  7. The method according to claim 6, characterized in that the first proportion is in a range of between 80 % and 100 % and the second proportion is in a range of between 20 % and 0 % so as to ensure the optical non-recognizability of the transition point.
  8. The method according to one of claims 1 to 7, characterized in that no tonal value correction is carried out for the first and second portions, in which the partial separations are not overlaid, and that a position-dependent tonal value correction is carried out in such a manner for the third portions, in which the partial separations are overlaid, that a tonal value increase is greatest in such positions of the third portions, in which the area proportions of the partial separations are most alike.
  9. The method according to one of claims 1 to 7, characterized in that a tonal value reduction is carried out for the first and second portions, in which the partial separations are not overlaid, and that a position-dependent tonal value reduction is carried out in such a manner for the third portions, in which the partial separations are overlaid, that the tonal value reduction is smallest in such positions of the third portions, in which the area proportions of the partial separations are most alike.
  10. The method according to one of claims 1 to 9, characterized by the following steps: a) for each print color to be printed, provision is made for a total separation of the respective print color, the length of which is greater than the circumferential extension of forme cylinders, on which the printing formes have to be placed for the printing; b) the total separation of each print color to be printed is screened to form a primary screen; c) the primary screen of each print color to be printed is divided with the help of a secondary screen, the screen frequency of which is greater than the screen frequency of the primary screen, into screened partial separations for the respective print color, wherein, for creating the first partial separation, the primary screen is overlaid with the secondary screen, in particular erased, and wherein, for creating the second partial separation, the primary screen is overlaid with the inverted secondary screen, in particular erased; d) the length of the partial separations is maximally limited to the length of the circumferential extension of the printing formes, wherein at least a partial separation can also be shorter than the length of the circumferential extension of the printing formes.
  11. The method according to claim 10, characterized in that the as yet unscreened total separation is subjected to a tonal value correction before screening the total separation to form the primary screen, namely in such a manner that tonal value fluctuations to be expected through the overlaying of the partial separations in the print image are compensated.
  12. The method according to claim 10 or 11, characterized in that the length of the total separation is approximately 50 % greater than the circumferential extension of forme cylinders, on which the printing formes for printing are to be placed for the printing, and that both partial separations compared with the total separation are in each case shortened by approximately 1/3, namely the first partial separation based on a first end of the total separation and the second partial separation based on a second end of the total separation.
  13. A method for printing a printing material web with a seamless or transitionless, respectively, endless or format-variable print image, respectively, in offset printing, wherein, for each print color to be printed of the print image, a total separation of the respective print color with at least two printing formes is applied to the printing material in such a manner that with a first printing forme, a first partial separation of the respective print color and with a second printing forme, a second partial separation of the respective print color is printed onto the printing material, characterized in that for each of the print color to be printed of the print image, the total separation of the respective print color is initially divided among at least two printing formes, namely by producing the corresponding first and second printing formes according to one of claims 1 to 12, and that exclusively the first partial separation of the first printing forme is subsequently printed onto the printing material by using these printing formes in first portions of the printing material web, and that exclusively the second partial separation of the second printing forme is printed onto the printing material in second portions of the printing material web, and that the first partial separation of the first printing forme and the second partial separation of the second printing forme is printed onto the printing material in an overlapping or overlaying manner, respectively, in third portions.
EP14177387.9A 2013-07-26 2014-07-17 Method and apparatus for producing printing stocks, and printing method Active EP2829400B1 (en)

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DE102013107996.2A DE102013107996A1 (en) 2013-07-26 2013-07-26 Method and device for producing printing forms and printing method

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EP2829400A2 EP2829400A2 (en) 2015-01-28
EP2829400A3 EP2829400A3 (en) 2015-08-19
EP2829400B1 true EP2829400B1 (en) 2016-10-05

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EP (1) EP2829400B1 (en)
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JPS57185152A (en) * 1981-04-08 1982-11-15 Konishiroku Photo Ind Co Ltd Manufacture of printing plate
DE3117663C2 (en) * 1981-05-05 1984-09-20 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Web-fed rotary printing press
DE4317984A1 (en) * 1993-01-29 1994-08-04 Dlw Ag Printing method and printing device
DK0681525T3 (en) * 1993-01-29 1997-06-02 Dlw Ag Method and apparatus for printing
JPH06297692A (en) * 1993-04-16 1994-10-25 Suzutora Seisen Kojo:Kk Lithographic rotary press for long sheet
IL116123A (en) * 1995-11-23 1999-07-14 Scitex Corp Ltd System and method for printing
JP3748194B2 (en) * 2000-04-26 2006-02-22 大日本スクリーン製造株式会社 Printing color management method and prepress printing system
CN1186694C (en) * 2002-12-05 2005-01-26 王柏枝 Printing printmaking method and printing plate thereof
DE102007047086A1 (en) * 2006-10-26 2008-04-30 Heidelberger Druckmaschinen Ag Printing form producing method for e.g. anilox printing machine, involves producing printing form based on image data, and producing correction values within area of printing machine in area wise manner based on print image
DE102006055587B4 (en) * 2006-11-24 2008-12-11 OCé PRINTING SYSTEMS GMBH Method, computer program and printing system for trapping print data with a plurality of objects
WO2009087440A2 (en) * 2008-01-09 2009-07-16 Flooring Industries Limited, Sarl Floor covering, formed from floor panels and method for manufacturing such floor panels

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ES2597243T3 (en) 2017-01-17
EP2829400A3 (en) 2015-08-19
DE102013107996A1 (en) 2015-02-19
US20150027331A1 (en) 2015-01-29
CN104339822A (en) 2015-02-11
EP2829400A2 (en) 2015-01-28

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