WO2010046271A1 - Method for illustrating printed image carriers - Google Patents

Method for illustrating printed image carriers

Info

Publication number
WO2010046271A1
WO2010046271A1 PCT/EP2009/063310 EP2009063310W WO2010046271A1 WO 2010046271 A1 WO2010046271 A1 WO 2010046271A1 EP 2009063310 W EP2009063310 W EP 2009063310W WO 2010046271 A1 WO2010046271 A1 WO 2010046271A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
printing
test
step
printed image
determined
Prior art date
Application number
PCT/EP2009/063310
Other languages
German (de)
French (fr)
Inventor
Shahram Hauck
Original Assignee
Manroland Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41CPROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00Forme preparation

Abstract

The invention relates to a method for illustrating printed image carriers that ensure, during printing, a specified target printing characteristic, namely a specified relation between prepress-based setting copy surface covering values and printed image surface covering values actually developed during printing, thus ensuring a defined increase in tone value, said method comprising at least the following steps: a) producing a test printed image carrier for at least one printing ink used in the printing, namely in such a way that a RIP file is produced from a test setting copy that reproduces, for each printing ink, a fine gradation wedge having a defined number of gradation steps, wherein each test printed image carrier is illustrated based on said RIP file; b) using the or each test printed image carrier produced according to step a) to print a test printed image, wherein the test printed image comprises the respective fine gradation wedge having the defined number of gradation steps for at least one printing ink used in the printing; c) measuring the printed image printed in step b) with the or each test printed image carrier in such a way that for each gradation step of the or each fine gradation wedge a test printed image surface covering value actually developed during printing is determined, wherein an actual printing characteristic for each printing ink is determined from the test setting copy surface covering values of each gradation step of the fine gradation wedge and the test printed image surface covering values of each gradation step of the fine gradation wedge actually developed during printing; d) comparing the or each actual printing characteristic determined in step c) with the target printing characteristic specified for the respective printing ink in such a way that, for each printed image surface covering value specified in the target printing characteristic for a defined setting copy surface covering value, the test printed image surface covering value developed in the printing in step b) is determined and is placed in proportion therewith in order to calculate a ratio, wherein the printed image surface covering values in the target printing characteristic are replaced with values that result from multiplication of the setting copy surface covering values and the ratios determined therefor in order to provide a corrected target printing characteristic; e) using the or each corrected target printing characteristic produced in step d), producing an RIP file from the setting copy of the printed image actually to be printed, said RIP file being used to illustrate the printed image carrier.

Description

A method for imaging of printing an image carrier,

The invention relates to a method for imaging in printing a predetermined target pressure characteristic, namely a predetermined relationship between druckvorstufebasier- th master surface coverage values ​​and actually forming in printing printing image area coverage values ​​and thus a defined dot gain, guaranteeing print image carriers such. B. printing plates.

Fig. 1 illustrates the known from the prior art procedures for the manufacture of offset printing products. From a file 10 for a printing template image processor 1 1 is generated a so-called RIP file 12 in a grid, wherein the RIP file 12 is used in an exposer 13 for printing forms such. B. exposing printing plates 14 and restore it. thereby a pressure plate 14 is prepared for each involved in the printing ink used in the printing units of a printing machine 15, 16 to print a print product. In assessing the print quality of such a printing process, a so-called pressure characteristic plays an important role, with a printing curve describes the relationship between area coverage values ​​of the file 10 and thus the artwork and actually forming during printing of copies 16 area coverage values. Thus, FIG. 1 shows an example of a pressure characteristic curve 17, wherein on the horizontally extending axis 18 Druckvorlageflächen- coverage values ​​of the file 10 and on the vertical axis 19 Druckbildflä- of original copy chendeckungswerte 16 are plotted. Furthermore visualized Fig. 1, the so-called dot gain 20, which is dependent inter alia on the type and setting of the printing machine used for printing, the quality of the printing material used for printing, and the properties of the ink used for printing. one that forms when printing a Istdruckkennlinie superiors given target pressure characteristic must to ensure good print quality for each Party to the printing ink as far as possible correspond. Otherwise z can. B. occur a so-called color cast or some other color print faults that can print quality adversely affected, and printing of waste lead. So far, it presents great difficulties that in printing actually forming during printing Istdruckkennlinie a predetermined desired pressure characteristic corresponds, so that a defined relationship between prepress based Druckvorla- geflächendeckungswerten and chendeckungswerten when printing actually forming Druckbildflä- and thus a defined dot gain is provided.

Proceeding from this lies the present invention, the problem of a novel method of imaging of printing image carriers to provide. This problem is solved by a method according to Claim. 1 The inventive method comprises at least the following steps: a) for at least one involved in the printing ink, a test print image carrier is produced, namely such that from a test master depicting a Gradationsfeinkeil with a defined number of gradation levels for each printing color, a RIP file is created is imaged on the basis of which the respective test print image carrier; b) Testdruck- the or each according to step a) is produced image carrier used to print a test print image, the print image test for at least one involved in the printing ink comprises the respective Gradationsfeinkeil with the defined number of gradation levels; c) the printed in step b) with the or each test print medium printed image is so measured that will be determined in the printing of actual training dender test printing image area coverage value for each gradation level of the or each Gradationsfeinkeils, wherein the Testdruckvorla- geflächendeckungswerten from each gradation level of Gradationsfeinkeils and each of the gradation is determined Gradationsfeinkeils a Istdruckkennlinie for each printing color when printing actually forming test printing image area coverage values; d) the or each Istdruckkennlinie determined in step c) is compared with the predetermined for the respective ink set pressure characteristic such that determined for each in the desired pressure characteristic given for a defined master surface coverage value print image area coverage value of that forms when printing in step b) the test printing image area coverage value and to form a is ratio value set in relation to the same, whereby to provide a corrected SoII- the print image area coverage values ​​printing characteristic are replaced by values ​​resulting from the multiplication of the master area coverage values ​​and the ratio values ​​calculated for the same in the desired pressure characteristic; e) by utilizing the or each corrected target pressure curve generated in step d) produces a RIP file from the master copy of the actual print image to be printed that is used for imaging of the print image carrier. With the present invention can be ensured in a simple and secure manner that a predetermined target pressure curve is maintained when printing for each involved in the printing ink. The inventive method can be performed fully automatically or semi-automatically. The procedure is for all known printing form-based printing processes, such. B. for offset printing, gravure printing, planographic printing, letterpress printing or stencil printing can be used. The inventive method can also be used for digital printing systems according to the Direktbebilderungsverfahren. It is suitable for use in sheet-fed printing machines and printing machines for Roll.

Preferred developments of the invention emerge from the subclaims and the following description. Exemplary embodiments of the invention, but are not limited to, explained in more detail on hand of the drawing. In which:

Fig. 1 is a block diagram showing a printing process; and

Fig. 2 shows a diagram to illustrate the method of the invention for imaging in the printing process a predetermined target pressure characteristic guaranteeing print image carriers.

The invention relates to a method for imaging or preparing for printing a predetermined target pressure characteristic guaranteeing print image carriers, wherein a predetermined desired characteristic curve original surface coverage values ​​a predetermined relationship between prepress based printing and image area coverage values ​​when printing actually forming pressure and thus describes a defined dot gain.

Next, the method for the production of printing plates will be described. However, the method is not limited thereto. Rather, the method can also be used for imaging of other print medium. At the predetermined target pressure characteristic, it may be a normalized set pressure curve or an internally defined by a printing target pressure curve to produce printed products in a desired print quality.

Fig. 2 shows such a predetermined target pressure characteristic curve 21, being plotted in Fig. 2 on the horizontally extending axis 22 each master area coverage values X n and on the vertical axis 23 of each printed image area coverage values Y n. Print image coverage values, the desired pressure characteristic curve 21 are marked with -soi_i_ Y n.

For the purposes of the process according to the invention a test plate is produced in a first step, for at least one involved in the printing ink, namely in such a way that, from a preferably linear test master depicting a Gradationsfeinkeil with a defined number of gradation levels for each printing color, preferably linear RIP file is created, of which the respective test printing plate is preferably exposed linearly to the base. The number of gradation levels for the Gradationsfeinkeil the respective ink is arbitrary. Thus, a Gradationsfeinkeil a printing ink may comprise up to 100 gradations, which are then each represent a gradation of the area coverage values ​​of 1%. It is also possible that a gradation comprising finely wedge 20 gradation levels, in which case each gradation level area coverage values ​​terracing by 5%.

It should be pointed out at this juncture that in the first step of the method according to the invention egg ne nonlinear RIP file may alternatively from preferably linear test master also be produced, of which the respective test plate is then exposed to non-linear based.

Such non-linear RIP file is preferably a previously determined using corrected target pressure characteristic, the image processor is stored in the raster, gener- ates. Thus, the target pressure curve for previously determined. have been determined as well by this method, however, the like under no more valid print conditions such as a different temperature, using a different ink type, a different or Bedruckstofftyps. In a second step of the method according to the invention, the or each test plate produced in the first step is used to print a test print image, wherein the test print image linearly exposed for at least one involved in the printing ink, namely, for the or each printing ink, for which in the first step, a respective test pressure plate was includes a Gradationsfeinkeil with the defined number of gradation levels. In the second step of the method according to the invention, therefore, the or each linear Test exposed printing plate is used for printing, wherein the printing in the second step of the method according to the invention to be used for printing the actual print image printing machine on which the actual printing

Print image to be used as well as printing is performed using the to be used for printing the actual print image printing ink and, optionally, to use for the dampening solution.

In a third step of the method the printed with the or each printing plate test print image is measured, namely such that a will be determined when printing actually forming Direction test printing image area coverage value for each gradation level of the or each printed Gradationsfeinkeils.

From the test master area coverage values X of each of the gradation level Gradationsfeinkeils and actually forming in printing Testdruckbildflächende- n ckungswerten Y n- ιsτ each gradation level of the corresponding Gradationsfeinkeils is determined a Istdruckkennlinie for each printing color. In Fig. 2, such Istdruckkennlinie 24 is shown by way of example, one such Istdruckkennlinie 24 accordingly for a printing ink ckungswerten the relationship between the Druckbildflächende- and the master area coverage values ​​indicates which is established when printing a Gradationsfeinkeils with a linearly exposed test printing plate. . Furthermore, in Fig 2 is a registered Especially 25, against which the so-called dot gain is determined and in which: X n = Y n.

The metrological evaluation of the gradation levels of the or each printed Gradationsfeinkeils for determining the respective Istdruckkennlinie for the respective printing ink is preferably carried out using a densitometer. Alternatively, however, another Farbmessqerät can be used. Measuring the gradation of the or each printed Gradationsfeinkeils can be done offline for printing eg using hand-held instruments or fully automated measuring devices or inline for printing by means of fully automated instruments.

In a fourth step of the method the Istdruckkennlinie 24 determined for a printing ink is compared with the predetermined for the respective ink set pressure characteristic curve 21 so below that for everyone in the target pressure curve 21 coverage value for a defined master surface coverage value X n predetermined Druckbildflächen- Y n -soi_i_ the will be worth determined Y n I S T when printing forming Testdruckbildflächendeckungs- and taken into consideration to form a ratio value using the same, wherein the print image area coverage values by values Y Π for providing a corrected desired pressure characteristic in the target pressure curve - be replaced NRC, resulting from the - SOLL result of the multiplication master area coverage values X n and the ratio values calculated for those same. It therefore applies:

Y n-SOLL

± Y n-SET NEW = Λ X n *

Y n "-LST

In FIG. 2, this is exemplarily provided for the master surface coverage value X n by 40% DAR which, after the desired pressure characteristic curve 21, a printing image area coverage value Y n -soι_ι_ should guarantee of 65%. On the Istdruckkennlinie 24 to the prepress position coverage value X n of 40% corresponding Testdruckvorlageflächende- ckungswert X n of 40% of that forms when printing Testdruckbildflächende- ckungswert Y n ι S τ is now determined, in accordance with the Istdruckkennlinie 24 of FIG. 2 carries 53% loading here. The printed image area coverage value determined Y n -soι_ι_ of 65% and the test printing image area coverage value Y n-ι S thus determined τ of 53% are taken into consideration and multiplied by the master area coverage value or test master surface coverage value X n by 40%, so to provide the corrected target pressure characteristic in the set pressure characteristic for the master area coverage value or Testdruckvorlage- area coverage value X n by 40% of the printing image area coverage value by following value Y n- sET NEW is replaced Y. target NEW = 40% * (65/53) = 49%. Utilizing the generated in the fourth step of the inventive method corrected desired pressure characteristic for each printing color image processor, a corrected RIP file from a master copy of the actually printing the print image generated in the grid used for exposing the area needed to print the actually printed printing image printing plates becomes. The calculated corrected target pressure curve thus represents a correction characteristic for the raster image processor represents the same are generated for a print job printing plates using, of which the predetermined desired pressure characteristic can be maintained 21 for each printing color by means then that can be used which so ensures that the Istdruckkennlinien correspond to the respective desired pressure characteristics.

Preferably, an ink which is determined individual Istdruckkennlinie an ink individual corrected desired pressure characteristic for the raster image processor on the basis is determined for each participant for printing the actual print image printing ink to the above manner.

In this case, an appropriate test printing plate is generated with a corresponding Gradationsfeinkeil then for each involved in the printing ink, in which case the JE weiligen printed using the test plates to determine the Gradationsfeinkeile Istdruckkennlinien are evaluated by measurement.

Are for. B. continues to participate two special inks for offset printing by the autotypical combined printing besides the four process colors cyan, magenta, yellow and black, so then appropriate for all six inks test printing plates would be generated with appropriate Gradationsfeinkeilen, for each of the printing colors, a corrected set pressure characteristic for the raster image processor to determine printing inks individually.

In contrast, it is also possible that individual printing inks and printing inks Istdruckkennlinien individual corrected desired pressure characteristics only for a subset of the inks used to print the actual printed image according to the invention is determined. For the or each printing ink, for which no print colors individual Istdruckkennlinie is determined by printing and measurement technology evaluating an ink-individual Gradationsfeinkeils, a corrected desired pressure characteristic can be determined based on the Solldruck- characteristics correction of a reference printing ink, for which an ink individual Istdruckkennlinie and an ink individual corrected target pressure curve was determined.

The method described above is ren for all known printing form based Druckverfah-, such. B. for offset printing, gravure printing, planographic printing, letterpress printing or stencil printing can be used. The inventive method can also be used for digital printing systems according to the Direktbebilderungsverfahren. So it is not limited to the production of printing plates, but rather can also be used in the production or other imaging print medium or printing forms.

LIST OF REFERENCE NUMBERS

10 a master file

1 1 raster image processor 12 RIP file

13 imagesetter

14 pressure plate

15 printing press

16 17 Pressure copy printing curve

18 a master coverage values

19 print image area coverage values

20 dot gain

21 target pressure characteristic curve 22 a master area coverage values

23 print image area coverage values

24 Istdruckkennlinie

25 straight

Claims

claims
1. A method for imaging in printing a predetermined target pressure characteristic, namely a predetermined relationship between prepress based Druckvorla- image area coverage values ​​geflächendeckungswerten and actually forming in printing pressure and thus a defined dot gain, guaranteeing print image carriers, with at least the following steps: a) for at least one at Print involved printing ink is generated, a test printing image carrier, namely such that reflects from a test master, the staining for the particular printing a Gradationsfeinkeil with a defined number of gradation levels, a RIP file is created is imaged on the basis of which the respective test print image carrier; b Test pressure generated image carrier), the or each according to step a) is used to print a test print image, the print image test for at least one involved in the printing ink comprises the respective Gradationsfeinkeil with the defined number of gradation levels; c) the printed in step b) with the or each test print medium printed image is so measured that will be determined in the printing of actual forming Direction test printing image area coverage value for each gradation level of the or each Gradationsfeinkeils, wherein the test master area coverage values ​​of each gradation level of Gradationsfeinkeils and actually made during printing forming test printing image area coverage values ​​of each gradation level is determined Gradationsfeinkeils a Istdruckkennlinie for each printing color; d) the or each Istdruckkennlinie determined in step c) is compared with the predetermined for the respective ink set pressure characteristic such that, in each of the
Target pressure curve given for a defined master surface coverage value printing image area coverage value which will determined when printing in step b) forming test printing image area coverage value and taken into consideration to form a ratio value using the same, wherein by the provision of a corrected desired pressure characteristic in the target pressure characteristic, the print image area coverage values
Values ​​are replaced, the ckungswerte from the multiplication of the and Druckvorlageflächende- give the ratio values ​​determined for the same; e) by utilizing the or each corrected target pressure curve generated in step d) produces a RIP file from the master copy of the actual print image to be printed that is used for imaging of the print image carrier.
2. The method according to claim 1, characterized in that for each participant for printing the actual print image Duck color for the purposes of steps a) to e) a custom Istdruckkennlinie and individual corrected desired pressure characteristic is ER- averages.
3. The method according to claim 1, characterized in that for a subset of the Duck inks involved for printing the actual print image in accordance with the steps of a) an individual Istdruckkennlinie and individual corrected Solldruck- is characteristic determined to e), and that for the or each Duck color for which no individual Istdruckkennlinie a corrected target pressure characteristic based on the desired printing characteristics correction of a reference print color is determined for which to e) a custom Istdruckkennlinie and individual corrected target pressure curves which were determined for the purposes of steps a) is determined.
4. The method according to any one of claims 1 to 3, characterized in that) the test print image is printed on the to be used for printing the actual print image printing machine and under the conditions prevailing for printing the actual print image printing conditions in step b.
5. The method according to any one of claims 1 to 3, characterized in that) is measured, the test print image using a densitometer in step c.
6. A method according to any one of claims 1 to 5, characterized in that to be exposed for the purposes of steps a) to e) as a print medium printing forms.
7. The method according to claim 6, characterized in that are exposed as printing formes printing plates.
8. A method according to any one of claims 1 to 5, characterized in that for the purposes of steps a) to e) are directly imaged as a print image carrier erasable and writable resist printing forms.
9. The method according to any one of claims 1 to 8, characterized in that a linear RIP file is created in step a) from a test print template is imaged straight on the basis of which the respective test print image carrier.
10. A method according to any one of claims 1 to 8, characterized in that in
Step a) is generated a non-linear RIP file from a master test using a determined advance corrected desired pressure characteristic is imaged non-linearly on the basis of which the respective test print image carrier.
PCT/EP2009/063310 2008-10-24 2009-10-13 Method for illustrating printed image carriers WO2010046271A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102008043164.8 2008-10-24
DE200810043164 DE102008043164A1 (en) 2008-10-24 2008-10-24 A method for imaging of printing an image carrier,

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090748728 EP2349718B1 (en) 2008-10-24 2009-10-13 Method for illustrating printed image carriers

Publications (1)

Publication Number Publication Date
WO2010046271A1 true true WO2010046271A1 (en) 2010-04-29

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DE (1) DE102008043164A1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2953756A1 (en) * 2009-12-15 2011-06-17 Profil Press New process for designing usable cliches flexography

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260806A (en) * 1990-08-29 1993-11-09 E. I. Du Pont De Nemours And Company Process for controlling tone reproduction
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
WO2001091453A1 (en) 2000-05-22 2001-11-29 Mark Priest Calibrating printing machines
US20020122081A1 (en) * 2001-03-01 2002-09-05 Rudolf Epple Reproduction method for printing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6575095B1 (en) * 1999-09-10 2003-06-10 Agfa-Gevaert Method and apparatus for calibration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260806A (en) * 1990-08-29 1993-11-09 E. I. Du Pont De Nemours And Company Process for controlling tone reproduction
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
WO2001091453A1 (en) 2000-05-22 2001-11-29 Mark Priest Calibrating printing machines
US20020122081A1 (en) * 2001-03-01 2002-09-05 Rudolf Epple Reproduction method for printing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2953756A1 (en) * 2009-12-15 2011-06-17 Profil Press New process for designing usable cliches flexography
WO2011073136A1 (en) * 2009-12-15 2011-06-23 Profil Press Novel method for designing plates usable in flexography

Also Published As

Publication number Publication date Type
EP2349718B1 (en) 2013-08-28 grant
EP2349718A1 (en) 2011-08-03 application
DE102008043164A1 (en) 2010-04-29 application

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