EP1251011A2 - Méthode pour varier la densité en pleine teinte des couleurs pour l'impression offset dans une machine d'impression rotative - Google Patents

Méthode pour varier la densité en pleine teinte des couleurs pour l'impression offset dans une machine d'impression rotative Download PDF

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Publication number
EP1251011A2
EP1251011A2 EP02008377A EP02008377A EP1251011A2 EP 1251011 A2 EP1251011 A2 EP 1251011A2 EP 02008377 A EP02008377 A EP 02008377A EP 02008377 A EP02008377 A EP 02008377A EP 1251011 A2 EP1251011 A2 EP 1251011A2
Authority
EP
European Patent Office
Prior art keywords
grid
printing
micro
area
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02008377A
Other languages
German (de)
English (en)
Other versions
EP1251011A3 (fr
EP1251011B1 (fr
Inventor
Armin Weichmann
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 AG
Original Assignee
MAN Roland Druckmaschinen 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
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Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP1251011A2 publication Critical patent/EP1251011A2/fr
Publication of EP1251011A3 publication Critical patent/EP1251011A3/fr
Application granted granted Critical
Publication of EP1251011B1 publication Critical patent/EP1251011B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • 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
    • 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
    • B41M1/02—Letterpress printing, e.g. book printing
    • B41M1/04—Flexographic 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
    • 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
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • controllability of the inking unit with regard to the range of colors has disadvantages both in terms of the standard effort, as well as in terms of the resulting resulting complexity of the inking unit, as well as in terms of the desired Different color samples have no effect on subsequent ones Printed copies.
  • inking systems e.g. B. in offset printing the anilox inking unit, that is Short inking unit for printing with low-viscosity printing inks, for example for the Newspaper printing, the ink more directly over an anilox roller and a few Bring the intermediate cylinder onto the printing form and thus considerably reduce it Show complexity with all the resulting benefits.
  • inking units only allow a very limited regulation of the Color range.
  • Each substrate now needs a specific one for a defined solid color density Color quantity, depending on surface roughness, absorbency, kick-off behavior and others.
  • An inking unit that cannot be regulated in terms of ink quantity in connection with A binary printing form can therefore only have certain solid densities, depending on The type of substrate fluctuates, it should not be different depending on the substrate Anilox roller or a color of other pigment concentrations or viscosity be used.
  • the object of the present invention is therefore to provide a method for varying the Color density of the full tone when printing within a rotary printing press develop that despite the constant color supply of the inking unit or the color-applying elements a control of the solid color density, or a Adjustment of the halftone values in the print allowed.
  • the object is achieved by the measures of claim 1. That included the printing process used itself can preferably be lithographic offset, High pressure, flexographic or electrophotographic or electrographic Be pressure. However, the invention is not limited to these methods.
  • the geometric tonal value increase in color transfer from the Note the printing form on the substrate.
  • dot gain is based on the concept of area coverage. Area coverage is defined as the share of Area in a specific location that is covered with paint. This is measured either via optical-geometric measurement methods, which the pure measure geometric area coverage or by measuring the Transmission ratios of fully covered area (full tone) and the partially covered area (halftone), which is then the effective or optical Measure area coverage.
  • the screen dot size (in a basic screen) is a decisive factor for the print quality. Lighter color nuances are usually represented in printing by rasterizing the three basic colors cyan, magenta and yellow together with black. The dot size is determined in the binary imaging of the printing form in accordance with the tonal values of the respective image information. During screening, bright image areas are broken down into small and dark image areas into larger screen dots (binary, area-variable image information). This applies to both a periodic autotype grid and a stochatic grid.
  • the area coverage in% serves as image information.
  • the halftone value can be in Percent area coverage are specified, i.e. 0% for white and 100% for Full surface. As is well known, the halftone tone value does not correspond to the print geometrical area coverage on the printing form, since both geometrical and optical effects also lead to a so-called dot gain.
  • Tonal value increase in the sense meant here is the increase in Coverage from the printing form to the substrate.
  • the dot gain splits into two parts, an optical and a geometric.
  • the optical component is caused by light migration in the substrate (light trap) uncovered areas to the covered areas.
  • the geometrical The part that just plays a role in the method according to the invention is represented by Squeezing effects in the ink transfer points from the printing form to the substrate or in electrophotography using toner clouds around the actual image areas evoked around. This effect reduces that on the printing form not covered area geometrically from the edges of the covered area.
  • Controlling the color given is the basic grid of halftone dots for the area-variable image information, which determines the area coverage, a very fine, preferably compared to the basic grid by at least a factor of two finer micro grid is subordinate to the area coverage of the basic grid the set percentage is reduced.
  • the printing form now takes according to the geometrically covered areas from the system providing the color Ink off - in offset these are the inking rollers of the inking unit - through which However, the microgrid does not appear on the printing substrate more.
  • the dot gain results from the difference of the known Screen tone value for the printing form illustration and the measured Screen tone value in print.
  • the dot gain as a deviation of the Screen tone value in print from the screen tone value of the printing form can be used for Imaging and micro grid backing can be used directly in a so-called Pressure characteristic curve are shown.
  • This generation of characteristic curves and their Use in the printing process is from densitometric measuring technology for Printing presses are well known and are not discussed further here.
  • Fig. 1 B shows schematically. It is of course possible in Area of the highlights according to FIG. 1 C) to dispense with a micro grid, or to set to 0% tonal value reduction. Also a smooth transition with a high one Reduction with large tonal values and little to no reduction in small tonal values are conceivable.
  • the entire point structure must be in its transmission characteristics be characterized and compensated.
  • Area lower optical density of a raster point and in particular also the Solid tone density must of course be used when determining a tone value curve be taken into account.
  • the effective optical area coverage is then analogous to previous measurement, the ratio of remission of the grid area to Solid area, even if the printing form for both the solid and the halftone dot Can have holes.
  • the above procedure is also based on stochastic grids and hybrid Grid transferable.
  • the points are then essentially the same size a micro grid is highlighted. This happens in an extended version of the Then the procedure after checking the environment is not, or only to a lesser extent Extent when a point stands alone or a cluster does not have a certain size exceeds.
  • the micro grid can also be stochastic both in connection with conventional as well as stochastic Screening.
  • the method according to the invention for offset printing is preferably used an anilox inking unit used.
  • the printing form preferably a thermal one imageable plate or sleeve without chemical aftertreatment, which is a very high edge sharpness and resolution is allowed in or outside the Printing machine with a resolution of z.
  • the laser imagesetter writes with continuous steel.
  • the basic grid is not modified for maximum color transfer, or set to 0% area coverage reduction.
  • 25% in the covered areas i.e. the Area elements of the binary image information
  • the Laser writing beam each two pixels (halftone dots) wide, i.e. e.g. switched on for 10 ⁇ m, then one pixel (halftone dot) i.e. for 5 ⁇ m switched off. In the adjacent writing line, one pixel is then offset, written the same pattern, so that each 5 ⁇ m insulated holes arise.
  • Another embodiment can write beams larger than 10 microns use, but is not limited to this. Is in the writing direction of the Laser beam realizes a higher addressability than the spot diameter corresponds, the addressability grid in the scanning direction is narrower than transverse to Scanning direction. It can be used to create rectangular holes that are perpendicular to the Scanning direction lie (see Fig. 3 A)) up to the square hole (see Fig. 3 B) and C)) and rectangular hole in the scanning direction.
  • the proportion of 20 ⁇ m points to 10 ⁇ m points can then still be an intermediate gradation can be created.
  • Area of the higher Area coverage can be transferred with the same effective area coverage Color amount can be controlled via the average hole size. If the holes in the Medium is larger, more color is transferred than medium-sized ones but more numerous holes, because then the continuous solid areas are smaller.
  • this can also be used for correcting tonal value characteristics in conventional inking units which can be regulated in zones or over a wide range.
  • the full tone is not interspersed with holes and its effective density is reduced, but only the halftone dots according to a predetermined characteristic.
  • it can be used to produce a printing press with a linear transfer characteristic by just compensating for the effective dot gain.
  • Another alternative application is a local reduction in the full tone or Screen density, depending on predictable color transfer deviations from the target, e.g. Paint waste or stenciling. This is a compensation of Weaknesses in the paint application system possible, both independent of the subject can also be subject to subject.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Color Image Communication Systems (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP02008377A 2001-04-20 2002-04-12 Méthode pour varier la densité en pleine teinte des couleurs pour l'impression offset dans une machine d'impression rotative Revoked EP1251011B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10119368 2001-04-20
DE10119368A DE10119368B4 (de) 2001-04-20 2001-04-20 Verfahren zum Variieren der Farbdichte des Volltons beim Druck innerhalb einer Rotationsdruckmaschine

Publications (3)

Publication Number Publication Date
EP1251011A2 true EP1251011A2 (fr) 2002-10-23
EP1251011A3 EP1251011A3 (fr) 2003-12-10
EP1251011B1 EP1251011B1 (fr) 2006-06-07

Family

ID=7682089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02008377A Revoked EP1251011B1 (fr) 2001-04-20 2002-04-12 Méthode pour varier la densité en pleine teinte des couleurs pour l'impression offset dans une machine d'impression rotative

Country Status (4)

Country Link
US (1) US6701847B2 (fr)
EP (1) EP1251011B1 (fr)
CA (1) CA2382338C (fr)
DE (2) DE10119368B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109890623A (zh) * 2016-05-27 2019-06-14 艾司科软件有限公司 用于弹性印刷中的平滑器色调响应的方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1944160A1 (fr) * 2007-01-12 2008-07-16 Renolit AG Film multicouches, spécialement pour la production d'articles de bureautique, utilisation du film et son processus de fabrication
DE102009015580A1 (de) 2008-04-22 2009-10-29 Heidelberger Druckmaschinen Ag Verfahren zur Reduzierung der Flächendeckung einer Druckplatte
EP2112818B1 (fr) 2008-04-22 2015-06-10 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de réduction de la couverture de surface d'une plaque de compression
DE102009034078A1 (de) 2008-08-08 2010-02-11 Heidelberger Druckmaschinen Ag Verfahren zur Reduzierung der Flächendeckung einer Druckplatte
US8399177B2 (en) * 2008-12-08 2013-03-19 Eastman Kodak Company Enhanced relief printing plate
US9446578B2 (en) * 2012-06-11 2016-09-20 Eastman Kodak Company Methods of manufacture and use of customized flexomaster patterns for flexographic printing
US20140020587A1 (en) * 2012-07-19 2014-01-23 Kurt M. Sanger Embedding data with offset printing
GB201604532D0 (en) 2016-03-17 2016-05-04 Reproflex3 Ltd Improvements in printing plate surface patterning
EP3461116B1 (fr) * 2017-09-23 2024-04-17 Heidelberg Polska Sp. z o.o. Procédé et système pour criblage am et protection d'imprimés

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363842B1 (fr) 1988-10-08 1993-12-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé pour la fabrication de plaques d'impression
DE19624441C1 (de) 1996-06-19 1997-12-04 Roland Man Druckmasch Verfahren und Vorrichtung für den Tiefdruck mittels einer löschbaren Tiefdruckform

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660245B1 (fr) * 1990-04-03 1996-08-09 Nouel Jean Marie Plaques ou cliches destines a l'impression, procede pour leur preparation, films ou caraceres utiles a leur preparation, leur utilisation en imprimerie.
US5121689A (en) * 1991-03-27 1992-06-16 Rockwell International Corporation Ultrasonic ink metering for variable input control in keyless lithographic printing
US5396839A (en) * 1992-09-23 1995-03-14 Col1Or Apparatus and method for printing color images
FR2722584B1 (fr) * 1994-07-13 1996-10-31 Nouel Jean Marie Utilisation du tramage a modulation de frequence pour alleger en offset les surfaces imprimantes
US6060208A (en) 1996-12-16 2000-05-09 Creo Products Inc. Method for matching optical density in color proofing
DE19822662C2 (de) * 1998-05-20 2003-12-24 Roland Man Druckmasch Verfahren zur Farbreproduktion auf einer Bilddaten orientierten Druckmaschine
US6522421B2 (en) * 1998-10-28 2003-02-18 Nexpress Solutions Llc Method and apparatus for automatically communicating returning status and information from a printer using electronic mail (email).
US6731405B2 (en) * 1999-05-14 2004-05-04 Artwork Systems Printing plates containing ink cells in both solid and halftone areas
US6213018B1 (en) * 1999-05-14 2001-04-10 Pcc Artwork Systems Flexographic printing plate having improved solids rendition
US6198886B1 (en) * 1999-08-12 2001-03-06 Xerox Corporation Method and apparatus comprising process control for scavengeless development in a xerographic printer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363842B1 (fr) 1988-10-08 1993-12-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé pour la fabrication de plaques d'impression
DE19624441C1 (de) 1996-06-19 1997-12-04 Roland Man Druckmasch Verfahren und Vorrichtung für den Tiefdruck mittels einer löschbaren Tiefdruckform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109890623A (zh) * 2016-05-27 2019-06-14 艾司科软件有限公司 用于弹性印刷中的平滑器色调响应的方法
CN109890623B (zh) * 2016-05-27 2021-10-08 艾司科软件有限公司 弹性板、创建其的方法和成像系统

Also Published As

Publication number Publication date
CA2382338C (fr) 2007-06-19
DE10119368A1 (de) 2002-11-21
US6701847B2 (en) 2004-03-09
US20020152911A1 (en) 2002-10-24
EP1251011A3 (fr) 2003-12-10
EP1251011B1 (fr) 2006-06-07
CA2382338A1 (fr) 2002-10-20
DE10119368B4 (de) 2004-09-09
DE50207059D1 (de) 2006-07-20

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