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WO2008122444A1 - Procédé de mesure de spectres optiques dans l'impression sur presses à bobines - Google Patents

Procédé de mesure de spectres optiques dans l'impression sur presses à bobines Download PDF

Info

Publication number
WO2008122444A1
WO2008122444A1 PCT/EP2008/002844 EP2008002844W WO2008122444A1 WO 2008122444 A1 WO2008122444 A1 WO 2008122444A1 EP 2008002844 W EP2008002844 W EP 2008002844W WO 2008122444 A1 WO2008122444 A1 WO 2008122444A1
Authority
WO
WIPO (PCT)
Prior art keywords
spectra
partial
burst
web
measurements
Prior art date
Application number
PCT/EP2008/002844
Other languages
German (de)
English (en)
Inventor
Matthias Riepenhoff
Original Assignee
Wifag Maschinenfabrik 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
Application filed by Wifag Maschinenfabrik Ag filed Critical Wifag Maschinenfabrik Ag
Priority to AT08735153T priority Critical patent/ATE485164T1/de
Priority to DE502008001594T priority patent/DE502008001594D1/de
Priority to EP08735153A priority patent/EP2134547B1/fr
Publication of WO2008122444A1 publication Critical patent/WO2008122444A1/fr

Links

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
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

Definitions

  • Modern printing presses are increasingly being equipped with control systems to reduce waste and ensure quality. Examples: cutting registers, color register systems, color density control.
  • control elements are printed to assess print quality.
  • newspaper printing it is desirable to dispense with control elements or make them unattractive.
  • the measuring head of an optical measuring system is moved successively to different locations across the web. While the printed web passes the measuring head is continuously measured.
  • the individual elements of a burst correspond to smaller image sections.
  • the image sections are assigned to individual elements of a burst.
  • One way to implement the method uses a spectrometer and continuous illumination.
  • the remission spectra of the moving, printed web are continuously measured.
  • the first values correspond to the measuring spot around a pixel (X, Y)
  • the last values near infrared
  • the web travels a distance of almost 2cm during the reading time, so the measurement can not be assigned to a scene, but is "smeared” over about 2cm. With a radius of the measuring spot rm of approx. 2-4mm, this deviation is not negligible.
  • Preferred Solution Previously, burst measurements were made so that one burst corresponded to the slice length, or the measurement time was one print cycle (or multiple). If a burst of b corresponded to partial measurements of a circumference, then for a measurement over k printing cycles, the partial measurements at time ti and tj + b correspond in each case to the same image detail. For the preferred solution it is now proposed to adjust the measuring time so that the partial measurements violate this rule. There is a beating of the measured spectra with the frequency 1 / (T- (Vt 0 )) - 1 / T. The readout delay for the individual spectral ranges is known. One can re-sort the proportions of the spectra, so that corrected spectra arise, which can be assigned to an image area with sufficient accuracy.
  • FIG. 1 A first figure.
  • the section length of the machine is U.
  • the machine speed is V.
  • a burst measurement starts at a time to and has n partial measurements which start at the times to, ti, t 2 ,..., T n .
  • Burst measurement over the reduced D section length consists of b partial measurements.
  • S (i) is a spectrum that contains a wavelength range from 380nm to 980nm.
  • S (i, l) has a wavelength range from 380nm to 500nm, S (i, 2) from 501nm to 620nm, S (i, 3) from 621nm to 740nm, S (i, 4) from 741nm to 860nm, S (i , 5) from 861nm to 980nm.
  • S (i) has 180 nodes, then the partial spectra have 36 nodes each.
  • the partial spectra S (1, 2), ..., S (l, k), S (2,3), ..., S (k, 3), ..., S (k , kl), which are at the beginning of a burst, can not be assigned to S '(i). Also, the sub-spectra S (k, n-k + 1), S (k, n-k + 2), S (kl, n-k + 2), ..., S (l, n), in the end a bust measurement are included are not evaluated.
  • the measurement is performed such that each partial spectrum of a measured spectrum S can be used to be used as part of a new spectrum S '. This would be the case if the sub-spectra at the beginning and end of a burst could be assigned to each other.
  • a "cyclic" measurement situation would have to be achieved, ie the image locations of the last k partial measurements would have to correspond-at least with the accuracy D / 2-to the image locations of the first k partial measurements shifted by D.
  • the measurement data which are not needed to form this first spectrum, can therefore be used, if one does not stop the measurement after k pressure cycles, but measures a little longer.
  • the relative measuring time increases, the relative positioning time decreases.
  • the positioning of the measuring head takes a certain time, e.g. 0.5s.
  • the measurement duration for a print cycle is on the order of 0.1s. If measurements are taken over one printing cycle and then a new measuring position is approached, the measuring rate is less than 20%. The system takes most of the time to position the probe. The longer the measuring head measures in one place, the less time is lost for positioning.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un procédé permettant de mesurer des spectres optiques dans l'impression sur presses à bobines, qui se caractérise en ce qu'il est prévu une mesure continue de la bande imprimée.
PCT/EP2008/002844 2007-04-10 2008-04-10 Procédé de mesure de spectres optiques dans l'impression sur presses à bobines WO2008122444A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT08735153T ATE485164T1 (de) 2007-04-10 2008-04-10 Verfahren zur messung optischer spektren im rollendruck
DE502008001594T DE502008001594D1 (de) 2007-04-10 2008-04-10 Verfahren zur messung optischer spektren im rollendruck
EP08735153A EP2134547B1 (fr) 2007-04-10 2008-04-10 Procédé de mesure de spectres optiques dans l'impression sur presses à bobines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007016980A DE102007016980A1 (de) 2007-04-10 2007-04-10 Verfahren zur Messung optischer Spektren im Rollendruck
DE102007016980.0 2007-04-10

Publications (1)

Publication Number Publication Date
WO2008122444A1 true WO2008122444A1 (fr) 2008-10-16

Family

ID=39618985

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002844 WO2008122444A1 (fr) 2007-04-10 2008-04-10 Procédé de mesure de spectres optiques dans l'impression sur presses à bobines

Country Status (4)

Country Link
EP (1) EP2134547B1 (fr)
AT (1) ATE485164T1 (fr)
DE (2) DE102007016980A1 (fr)
WO (1) WO2008122444A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685139A (en) * 1985-03-14 1987-08-04 Toppan Printing Co., Ltd. Inspecting device for print
DE4136461A1 (de) * 1991-11-06 1993-05-19 Roland Man Druckmasch Verfahren und vorrichtung zur grossflaechigen bildinspektion
EP0738886A2 (fr) * 1995-04-20 1996-10-23 Eastman Kodak Company Analyseur de la densité de couche et procédé d'utilisation des appareils photographiques TDI nonsynchronisés
DE10131934A1 (de) 2001-07-02 2003-01-30 Wifag Maschf Messung und Regelung der Farbgebung im Rollendruck

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685139A (en) * 1985-03-14 1987-08-04 Toppan Printing Co., Ltd. Inspecting device for print
DE4136461A1 (de) * 1991-11-06 1993-05-19 Roland Man Druckmasch Verfahren und vorrichtung zur grossflaechigen bildinspektion
EP0738886A2 (fr) * 1995-04-20 1996-10-23 Eastman Kodak Company Analyseur de la densité de couche et procédé d'utilisation des appareils photographiques TDI nonsynchronisés
DE10131934A1 (de) 2001-07-02 2003-01-30 Wifag Maschf Messung und Regelung der Farbgebung im Rollendruck

Also Published As

Publication number Publication date
ATE485164T1 (de) 2010-11-15
DE502008001594D1 (de) 2010-12-02
EP2134547A1 (fr) 2009-12-23
DE102007016980A1 (de) 2008-10-16
EP2134547B1 (fr) 2010-10-20

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