EP1938987B1 - Verfahren und Vorrichtung zur Steuerung des Farbtransportes in einem Farbwerk - Google Patents

Verfahren und Vorrichtung zur Steuerung des Farbtransportes in einem Farbwerk Download PDF

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Publication number
EP1938987B1
EP1938987B1 EP20070023427 EP07023427A EP1938987B1 EP 1938987 B1 EP1938987 B1 EP 1938987B1 EP 20070023427 EP20070023427 EP 20070023427 EP 07023427 A EP07023427 A EP 07023427A EP 1938987 B1 EP1938987 B1 EP 1938987B1
Authority
EP
European Patent Office
Prior art keywords
temperature
ink
rollers
inking
roller
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.)
Not-in-force
Application number
EP20070023427
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1938987A3 (de
EP1938987A2 (de
Inventor
Uwe Püschel
Jürgen Schölzig
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 Sheetfed GmbH
Original Assignee
Manroland Sheetfed GmbH
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 Manroland Sheetfed GmbH filed Critical Manroland Sheetfed GmbH
Publication of EP1938987A2 publication Critical patent/EP1938987A2/de
Publication of EP1938987A3 publication Critical patent/EP1938987A3/de
Application granted granted Critical
Publication of EP1938987B1 publication Critical patent/EP1938987B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41F33/0063—Devices for measuring the thickness of liquid films on rollers or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/022—Ink level control devices
    • 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
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • 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
    • B41P2233/10—Starting-up the machine
    • B41P2233/11—Pre-inking
    • 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
    • B41P2233/30—Measuring or controlling the consumption of ink

Definitions

  • the invention relates to a method according to claim 1 and an apparatus according to claim 12.
  • thixotropic that is, the viscosity of the printing inks is reduced, inter alia, by movement.
  • ink fountain roller influenced by an ink fountain of dosing and the next inking roller provided in a first color layer.
  • This is usually a squeegee roller, which gradually decreases the ink layer from the ink fountain roller, or a film roller, which decreases the ink layer continuously from the ink fountain roller, and in an ink roller train formed by the inking rollers, arranged at the end of one or more inking rollers for coloring a printing plate are.
  • a squeegee roller which gradually decreases the ink layer from the ink fountain roller
  • a film roller which decreases the ink layer continuously from the ink fountain roller
  • an ink roller train formed by the inking rollers arranged at the end of one or more inking rollers for coloring a printing plate are.
  • the main task of an inking unit is to paint reliefs, which inevitably arise after a zonal different color output of ink to the printing plate on the inking rollers to equalize as completely as possible on a new inking of the inking rollers forth before the next contact of the inking rollers is done to the printing plate.
  • Devices of this kind are for example from the DE 4335097 A1 , of the DE 9316932 U1 and the DE 4202544 A1 known.
  • tempering With the so-called tempering the viscosity of the transported ink is influenced.
  • tempering devices have become known in almost all places of printing units and inking units.
  • the tempering can be made possible by means of the inking rollers through-flowing heat-bearing media from the inside.
  • temperature sensors are used to detect the surface temperature of inking rollers or cylinders in order to regulate the temperature of the tempering medium accordingly.
  • the location within an inking unit is described by the ink fountain roller on friction rollers to inking rollers.
  • the function of tempering is described for cooling and stabilizing the color transport.
  • the DE 4335097 A1 is described as a further effect, the reduction of pollution in a printing unit and the associated inking unit. It is not known how the color transport in an inking unit can be influenced by the devices described.
  • a tempering device for processing water-based printing inks. At the designated Heating of the inking unit by means of fan heaters is generated to evaporate water fractions of the ink from the ink fountain roller, starting from roller to roller in the inking unit down to the planographic printing decaying temperature gradient, the ink fountain roller is warmer than the other rollers.
  • the latter individual rolls are associated with a short inking unit.
  • the ink fountain roller of the short inking unit is designed as an anilox roller.
  • a color quantity control is basically not possible with an anilox roller, as it always provides the same amount of ink via a cell grid.
  • JP H08-290550 A a temperature control for printing machines, in which inking units are designed so that all distributor rollers and the ink fountain roller can be tempered.
  • the temperatures of the rollers should be performed in substantially the same temperature ranges, wherein for the ink fountain roller a smaller temperature range is specified than for the distributor rollers. Incidentally, these temperature ranges should be controlled in relation to the prevailing ambient temperature.
  • the object of the invention is therefore to provide a working method and an associated inking, in which avoided the disadvantages of the prior art and the color transport in an inking unit can be controlled as required in subjects with low color guide and the poster and display printing needs, so that the achievement of a fast coloring constancy is possible.
  • the inventive method provides that in a tempering of an offset printing unit, the temperature of the ink fountain roller is set to a lower value than the temperature of the following heatable rollers in the ink roller train.
  • this behavior is used in Drucker with relatively low color guide.
  • ink fountain roller Due to an increased temperature difference between ink fountain roller and inking unit, wherein the ink fountain roller has a lower temperature than the following inking rollers, a higher color density in inking the substrate with otherwise identical operating parameters such as speed, opening of Farbdosiermaschinen, lifter cycle, etc. achieved.
  • This behavior brings great advantages especially in poster or display printing with high demands on the color transfer and the color density in appearance on the substrate.
  • a very fast coloring constant is still achieved in the printing process.
  • the required temperature control can be done via the control of individual zones of the distributor roller.
  • a system is constructed via a manifold and control valves.
  • FIG. 1 a printing unit for sheetfed offset printing is shown in detail.
  • the printing unit contains a forme cylinder 1, a transfer cylinder 2 and an impression cylinder transport in sheet travel direction 3 serving impression cylinder 4.
  • the transfer cylinder 2, a dampening unit 5 and an inking unit 6 are assigned in a known manner.
  • the production of a printed image on a sheet is carried out in a nip between the transfer cylinder 2 and the impression cylinder 4.
  • the dampening unit 5 has in addition to a dampening solution and dampening solution rollers and a fountain solution application roller.
  • the inking unit 6 has an ink fountain 7, a ductor or ink fountain roller 8 and a squeegee roller 9.
  • the ink fountain 7 are further provided in association with the ink fountain roller 8 dosing systems not shown here.
  • so-called paint shifters or colorimeters are usually used, which produce a metering gap that can be varied according to the color requirement in relation to the ink fountain roller 8.
  • the dosing gap is zonal controllable and can be automatically adjusted in conjunction with a so-called color control system on the basis of color density measurements on the sheet.
  • the squeegee roller 9 is provided with a viscoelastic cover and is oscillated alternately against the ink fountain roller 8 and a first transfer roller 10 by means of a drive, not shown.
  • the first transfer roller 10 is usually carried out in practice as a so-called distributor roller.
  • the inking unit 6 has a plurality of further distributor rollers 11.
  • the distributor rollers 11 are rotationally and adjustably driven in an axially oscillating manner.
  • four inking roller 12 are provided by means of which printing ink is applied in the required amount to a stretched on the forme cylinder 1 pressure plate after it has been moistened by the dampening unit 5.
  • the inking unit 6 To generate a stationary color transport, the inking unit 6 must be filled. Only after all rollers, depending on their arrangement in the compactor and their surface condition including their surface temperature lead a certain color layer on their active surfaces, a stationary color transport can be set. The color transport is considered to be stationary if local nonuniformities of the ink layer thickness exceed the layer thickness differences resulting from the process start.
  • inking rollers 12 From the upper friction roller 11 two roller strands go out, the color flow to four inking rollers 12 each lead via two further distributor rollers 11 and transfer rollers. The division into roller strands results in a special color flow distribution. Inks of this type can often also be reversed in such a way that a standard configuration, a front-loading configuration or a symmetrical configuration with respect to the color flow distribution can be used during printing.
  • the inking rollers 12 apply the ink to the printing plate, from which the printed image on the transfer cylinder 2 is applied to the substrate on the impression cylinder 4.
  • the temperature of the inking unit 6 can in a known and here only schematically illustrated manner by flowing through the corresponding rollers with a bath liquid, z. B. according to heated or cooled heat transfer medium, such as water, take place.
  • a Temperierstoffniklauf with Temperieran Whyn TF for the ink fountain roller and T1 to T4 for the distributor rollers 11 is provided.
  • the Temperierstoffniklauf is provided with a cooling or heating device for the temperature control.
  • the temperature control is fed by means of feed pumps via appropriately guided lines and the temperature control TF or T1 to T4 the respective rollers axially and removed again.
  • the actual temperature control for the ink roller located on the ink fountain roller can be done either directly on the detection of properties of the ink or indirectly on the detection of properties of the temperature.
  • the temperature of the inking rollers or of the printing ink can be detected and subsequently controlled or regulated with the aid of sensors directed at the surfaces of the tempered inking rollers.
  • the control or regulation of the temperature control with the aid of control valves under detection of the temperature of the temperature control and the control of this temperature via heating or cooling and a suitable backmixing during circulation or also the control of the flow rates.
  • FIG. 2 and FIG. 3 schematics are shown, according to which the system can work.
  • FIG. 2 is a compilation of cutouts according to the already described inking unit 6 shown schematically.
  • the ink fountain rollers 8 are joined together by means of a temperature control TF.
  • the distributor rollers 11 are in turn to the Temperature control system connected to individual terminals T3 / T4 or to a summing terminal T1 ... T4. In this way, the temperature of the ink fountain rollers 8 can be adjusted completely independent of the temperature of the distributor rollers 11. As a controlled variable, the return temperature of the temperature control can be used.
  • FIG. 3 is a section of the inking unit 6 already described for a single printing unit shown schematically. Again, symbols for identifying a ink fountain roller 8 and distributor rollers 11 are given.
  • the ink fountain roller 8 is connected by means of a Temperierffenan gleiches TF via a control valve RF to a temperature control T.
  • a first upper friction roller 11 in turn is connected by means of a Temperierstoffan gleiches T1 via a further control valve R1 to the temperature control T. connected to individual terminals T3 / T4 or to a summing terminal T1 ... T4.
  • Two further distributor rollers 11 are connected by means of Temperierstoffan somebody T3 / T4 via a further control valve R3 to the temperature control T.
  • the temperature of the ink fountain roller 8 can be adjusted completely independent of the temperature of the distributor rollers 11.
  • the return temperature of the temperature control can be used.
  • the temperature of the ink fountain roller 8 can be done by means of the control valve RF to a flow rate control.
  • the inking unit 6 is operated as follows:
  • a color flow is transported from the ink fountain roller 8 to the first distributor roller 11.
  • the ink fountain roller 8 and the distributor roller 11 are tempered. They are flowed through independently of each other by means of temperature control, with appropriate devices to feed this and circulate.
  • the Temperiermedienströme or Temperiermedientemperaturen in the ink fountain roller 8 and the or the distributor rollers 11 are independently controllable in terms of both the amount and the temperature of the Tempering. Therefore, a different temperature level is adjustable at the ink fountain roller 8 than at the or the distributor rollers. 1
  • the ink fountain roller 8 When the ink fountain roller 8 is tempered to a lower temperature level relative to the temperature level of the distributor roller or distributor rollers 11, the ink flow from the ink fountain roller 8 via the squeegee roller 9 to the distributor roller 11 is intensified.
  • the temperature control in an undersupplied compactor e.g. for subjects that require only small amounts of ink in certain colors, relatively more ink is supplied at the same setting of the color dosage.
  • a sufficient amount of ink is always provided on the inking rollers 12 to saturate the printing areas of the printing plate with ink.
  • the ink layer thickness becomes e.g. detected on the first distributor roller 11.
  • the ink layer thickness there can then be changed relative to one another by the control mechanisms described by means of the temperature control of the ink fountain roller 8 and the distributor roller or the distributor rollers 11. Process-dependent changes can then be easily readjusted.
  • the required temperature control can take place via the regulation of individual zones of the temperature-controlled inking rollers 11.
  • the printed sheet is measured inline during the printing process and within the printing machine or offline outside the printing process on devices outside the printing press with regard to its color density printed per color. The measurements are used to determine if too much ink, enough ink, or too little ink has been applied to the sheet.
  • the control device of the tempering system can be influenced so that the temperature level is lowered at the ink fountain roller 8 by a defined amount. As a result, more ink is conveyed into the inking unit 6 and made a saturation of the ink supply to the sheet. In the event that too much ink was applied, the control device of the tempering system can be influenced so that the temperature level is raised at the ink fountain roller 8 by a defined amount. As a result, less ink is promoted in the inking unit 6 and made a reduction in the ink supply to the sheet to the necessary degree.
  • the required temperature differences between the ink fountain roller 8 and the temperature-controlled ink fountain rollers 11 can be stored as curves in the precursor, inking unit or machine control.
  • the parameters are the coverage of the image to be printed and the thus determined ink consumption, the type of ink, the general temperature level in the inking unit 6, the density level in the respective print image, the temperature level of the ink in the ink fountain 7, a limit temperature for the operation of ink fountain 7 and Dosing systems, the speed of the printing press and possibly other printing parameters in question.
  • the characteristics can be retrieved in the presetting or production control of the printing press on the control station for use in the respective inking unit 6. Likewise, the characteristics can be stored in the temperature control and retrieved by means of the machine control in connection with the respective color setting on each inking unit 6.
  • the starting temperature of the ink in the ink fountain is detected at the start of printing.
  • This can be done via a sensor optionally contactless by means of an infrared sensor.
  • the printing ink can be preheated prior to printing. It should be noted that at the Farbdosiersystemen that cooperate in the ink fountain 7 with the ink fountain roller 8 hydrodynamic Attack effects of the ink. Therefore, the ink must not be too tough, so that build up too high pressures and thus mechanical displacement, which change the color dosage or lead to leakage of the ink from the ink fountain. This is an important basic parameter for the starting temperature and the control limits of the temperature of the ink fountain roller 8.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP20070023427 2006-12-22 2007-12-04 Verfahren und Vorrichtung zur Steuerung des Farbtransportes in einem Farbwerk Not-in-force EP1938987B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610061341 DE102006061341A1 (de) 2006-12-22 2006-12-22 Vorrichtung zur Steuerung des Farbtransportes in einem Farbwerk

Publications (3)

Publication Number Publication Date
EP1938987A2 EP1938987A2 (de) 2008-07-02
EP1938987A3 EP1938987A3 (de) 2011-10-26
EP1938987B1 true EP1938987B1 (de) 2014-09-10

Family

ID=39365664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070023427 Not-in-force EP1938987B1 (de) 2006-12-22 2007-12-04 Verfahren und Vorrichtung zur Steuerung des Farbtransportes in einem Farbwerk

Country Status (3)

Country Link
EP (1) EP1938987B1 (enrdf_load_stackoverflow)
JP (1) JP2008155644A (enrdf_load_stackoverflow)
DE (1) DE102006061341A1 (enrdf_load_stackoverflow)

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CN102039725B (zh) 2009-10-21 2014-12-17 海德堡印刷机械股份公司 用于在具有网纹辊短输墨装置的印刷机中调整色差的方法
US20120274914A1 (en) 2011-04-27 2012-11-01 Palo Alto Research Center Incorporated Variable Data Lithography System for Applying Multi-Component Images and Systems Therefor
US20120103214A1 (en) * 2010-10-29 2012-05-03 Palo Alto Research Center Incorporated Heated Inking Roller for a Variable Data Lithography System
US8991310B2 (en) 2011-04-27 2015-03-31 Palo Alto Research Center Incorporated System for direct application of dampening fluid for a variable data lithographic apparatus
US9021948B2 (en) 2011-04-27 2015-05-05 Xerox Corporation Environmental control subsystem for a variable data lithographic apparatus
US8347787B1 (en) 2011-08-05 2013-01-08 Palo Alto Research Center Incorporated Variable data lithography apparatus employing a thermal printhead subsystem
US9021949B2 (en) 2012-02-06 2015-05-05 Palo Alto Research Center Incorporated Dampening fluid recovery in a variable data lithography system
US8950322B2 (en) 2012-03-21 2015-02-10 Xerox Corporation Evaporative systems and methods for dampening fluid control in a digital lithographic system
US9032874B2 (en) 2012-03-21 2015-05-19 Xerox Corporation Dampening fluid deposition by condensation in a digital lithographic system
US9316993B2 (en) 2012-07-12 2016-04-19 Xerox Corporation Electrophotographic patterning of an image definition material
US9639050B2 (en) 2012-07-12 2017-05-02 Xerox Corporation Electrophotographic patterning of an image definition material
US9316994B2 (en) 2012-07-12 2016-04-19 Xerox Corporation Imaging system with electrophotographic patterning of an image definition material and methods therefor
US9529307B2 (en) 2012-07-12 2016-12-27 Palo Alto Research Center Incorporated Imaging system for patterning of an image definition material by electro-wetting and methods therefor
US8833254B2 (en) 2012-07-12 2014-09-16 Xerox Corporation Imaging system with electrophotographic patterning of an image definition material and methods therefor
US8586277B1 (en) 2012-07-12 2013-11-19 Palo Alto Research Center Incorporated Patterning of an image definition material by electro-wetting
US9561677B2 (en) 2012-08-31 2017-02-07 Xerox Corporation Imaging member for offset printing applications
US9567486B2 (en) 2012-08-31 2017-02-14 Xerox Corporation Imaging member for offset printing applications
US8919252B2 (en) 2012-08-31 2014-12-30 Xerox Corporation Methods and systems for ink-based digital printing with multi-component, multi-functional fountain solution
US9956801B2 (en) 2012-08-31 2018-05-01 Xerox Corporation Printing plates doped with release oil
US9616654B2 (en) 2012-08-31 2017-04-11 Xerox Corporation Imaging member for offset printing applications
US9327487B2 (en) 2012-08-31 2016-05-03 Xerox Corporation Variable lithographic printing process
US9592698B2 (en) 2012-08-31 2017-03-14 Xerox Corporation Imaging member for offset printing applications
EP2886345A1 (en) * 2013-12-23 2015-06-24 Comexi Group Industries, S.A.U Automatic printing parameters adjustment and control method

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Also Published As

Publication number Publication date
EP1938987A3 (de) 2011-10-26
JP2008155644A (ja) 2008-07-10
EP1938987A2 (de) 2008-07-02
DE102006061341A1 (de) 2008-06-26

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