EP2167318B1 - Abfördern von druckfarbe - Google Patents

Abfördern von druckfarbe Download PDF

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Publication number
EP2167318B1
EP2167318B1 EP08784602.8A EP08784602A EP2167318B1 EP 2167318 B1 EP2167318 B1 EP 2167318B1 EP 08784602 A EP08784602 A EP 08784602A EP 2167318 B1 EP2167318 B1 EP 2167318B1
Authority
EP
European Patent Office
Prior art keywords
printing
sheets
ink
inking
cylinder
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.)
Active
Application number
EP08784602.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2167318A2 (de
Inventor
Jürgen Schölzig
Lothar KÜHLMEYER
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
Priority to PL08784602T priority Critical patent/PL2167318T3/pl
Publication of EP2167318A2 publication Critical patent/EP2167318A2/de
Application granted granted Critical
Publication of EP2167318B1 publication Critical patent/EP2167318B1/de
Active 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
    • B41F33/04—Tripping devices or stop-motions
    • B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/30—Recovering used solvents or residues

Definitions

  • the invention relates to a printing press with one or more printing units according to the preamble of claim 1 and a printing press according to the preamble of claim 2. Furthermore, the invention relates to a method for operating a printing press according to claim 10.
  • a substrate is moved through several printing units, wherein in each printing unit, a partial image of a printing plate, possibly on a blanket of a blanket cylinder, is applied to the substrate.
  • the substrate is usually moved through at least four printing units to apply partial printing images in the scale colors black, cyan, magenta and yellow to the substrate.
  • partial print images can be applied in special colors on the substrate.
  • printed images produced in this way can be applied with one or more coatings for the production of protective effects, for the production of structures or for the production of gloss or matt gloss effects.
  • the inking units used in the offset printing process can be conventional lifting inking units, film inking units or anilox inking units. Furthermore, combinations of such inking can be used within the printing press.
  • offset printing units it is also possible to use dampening units which serve to supply dampening solution to planographic printing plates mounted on plate cylinders and to ensure that only the image areas on the planographic printing plate can be wetted with printing ink. Dampening units are eliminated in so-called dry offset printing, which is carried out with special printing plates.
  • the decolorization is used when one of the printing plates is to be freed from printing ink without washing it, ie, having to clean it up in an expensive way. Otherwise, in the case of a washing process, the entire inking unit associated with the respective printing plate would have to be washed with.
  • decolorizing only a certain number of sheets without supply of ink to the printing plate are transported through the printing units, wherein printing units are shifted in pressure position and thus just then passing through the sheet remaining on the printing plate and the blanket residual ink largely decrease. Even in the case of the decolorization process, the printing plate is so clean that it can be removed or removed from the respective printing unit without causing further contamination of machine components or operating personnel.
  • the number of sheets to be used for decolorizing can be set by the operator on a control station of the printing press according to empirical values, wherein the position of the printing plate to be cleaned within the printing machine can be taken into account.
  • a paint-forming cylinder of a varnishing machine or a varnishing unit integrated in a printing machine is freed of superfluous varnish by the sheet passing through the printing press after the actual printing or coating process. Again, the number of sheets to be used is preselected. The cleaning of the paint forme cylinder is then much less expensive.
  • the corresponding printing plates are only conditionally cleaned, as these - albeit in decreasing quantity - continue to be supplied by the inking units.
  • the plate change so in this case is still only a dirty printing plate available, in particular also because in conventional inking, for example, offset presses a relatively large amount of ink is stored on a variety of ink rollers.
  • printing plates can be cleaned prior to removal via the inking unit or, covered in ink, removed by the plate changer in order to manually clean them outside. This pollute the plate change elements prematurely.
  • WO 2007/073834 A shows a printing machine according to the preamble of claim 1 and claim 2.
  • the present invention has the object to provide a novel method for operating printing, paint and inking units in printing presses.
  • a control circuit for measuring the color density on the printed sheet provides control signals, by means of which the number of necessary Entfärbungsbogen is determined.
  • the printing unit which has the greatest degree of contamination on the printing plates of the plate cylinders and the printing blankets of the blanket cylinders can be automatically selected in this way, so that when the order is terminated as a result of control with respect to a circulation counter corresponding to the number of printed good sheets the decolorization can run automatically.
  • the decolorizing or Abpackieren also occur before reaching a selected edition height. Then the respective process is initiated by a targeted interruption of the current printing process from the control center of the printing press. Thereafter, the printing process can be restarted or resumed with cleaned printing plates and blankets.
  • the same measures described above can be applied during paint removal.
  • the number of Ablack istsbogen is determined by the data in relation to a well volume of the anilox roller, the type of varnish used and the paint form (depending on whether full surface or suitable for spot varnishing) and the number of varnished sheets determinable.
  • the anilox roller and its specific data can also be identified via logistics data or integrated RFID systems.
  • the number of Ablack istsbogen can be determined by means of inline paint layer thickness measurement, so that when it falls below a minimum paint thickness, the paper feed to the feeder is stopped.
  • the printing or coating module for which the highest number of trailing sheets is calculated determines the actual number of sheets.
  • the supply of ink to the printing plate is in this case interrupted by the shutdown of the inking rollers, so that in printing position of the printing unit only residual ink from the printing plate or the blanket cylinder is vertikbar.
  • a color image is printed on a number of spoil sheets with constantly diminishing color order, whereby these waste sheets produced shortly before the printing stop can be discharged from the production process.
  • An advantage of this method is that the remaining ink layer on the surface of the printing plate by the interaction of form cylinder and blanket cylinder printed very quickly by dissipation on the blanket cylinder Substrate can be removed.
  • the color layer is reduced by the half split of the residual layer to very small layer thicknesses.
  • the inking and dampening rollers are turned off from the plate cylinder at a pre-calculated or metrologically determined point in time of a certain number of sheets before the final printing shutdown.
  • a simultaneous shutdown of inking and dampening rollers is provided according to the invention, since when turning off the inking rollers alone, a lower color decrease and thus a poorer cleaning effect was found.
  • the delayed or separate shutdown of the dampening rollers can still be useful as a procedure for special subjects, substrates or printing inks.
  • the shutdown of the coating units at least offset to the shutdown of the inking or dampening rollers in the context of decolorization done.
  • This can also be provided a paint removal be.
  • this should only take place when the quantity of ink remaining on the plate cylinder and the blanket cylinder is minimized, so that a splitting of printing ink from the printing sheet to coating forms or blankets in the coating units is reliably avoided in the or the coating units.
  • a printing machine has a sheet feeder and in the area of printing units each have at least one inking unit and the printing units downstream of a sheet delivery. Usually, several printing units are connected in succession. Printing sheets to be printed are moved over several sheet guiding cylinders through the printing machine, with some sheet guiding cylinders being designed as transfer cylinders and others as impression cylinders. In the area of the inking units, a transfer cylinder or blanket cylinder rolls on the impression cylinder. In turn, a printing cylinder or plate cylinder carrying at least one printing plate interacts with the blanket cylinder. About an inking unit with inking rollers and optionally a dampening unit with dampening rollers printing ink and optionally previously dampening solution is applied to the or each positioned on the plate cylinder printing plate.
  • the inking rollers and dampening rollers are this against the plate cylinder in an employee employed on the printing plate or parked off this position and turned off.
  • the printing ink is applied in each printing unit as a monochrome partial print image on the blanket cylinder on the printed sheets held on the impression cylinder.
  • the print sheets printed in the printing units with a complete printed image and optionally finished in a coating unit with a colored or clear surface layer are conveyed out of the printing press via a conveying system and placed on top of one another in a delivery pile in the sheet delivery.
  • the plate cylinders each have clamping means for printing plates to be positioned on the plate cylinder.
  • the plate cylinders are preferably each associated with a plate changing machine, by means of which the supply and discharge of fresh or used printing plates on the plate cylinder is made possible.
  • the stopping of at least the inking rollers from the plate cylinder always takes place at the end of production before the completion of the sheet travel or transport of printed sheets during a print job.
  • Plate cylinder, blanket cylinder and impression cylinder then still remain in contact with each other.
  • the on and off of inking rollers and the plate or blanket cylinder is performed via the actuators, which are controlled by a control device with respect to the working position of the printing press.
  • the actuators which are controlled by a control device with respect to the working position of the printing press.
  • corresponding lead times or angles are provided so that the actuators react in a timely manner.
  • the process of decolorization can be carried out either with dampening systems parked on the printing plates or with dampening units.
  • the operating mode can be selected and depends on the substrates used, the ink used, the type of printing plates or the area coverage of the subject on the respective printing plates. Therefore, it is also envisaged that a different treatment of printing plates in different printing units of the printing machine is made possible.
  • a so-called permanent moistening can be selected so that each of the dampening units can not be turned off when the decolorization process takes place, ie the decolorization must take place in all printing units used with the dampening unit on.
  • control device By means of the control device, it is possible to fix a number of printed sheets which, after the inking rollers have been turned off, are each still printed with an incomplete color image by means of the remaining ink remaining on the blanket cylinder and the printing plate.
  • the number of printed sheets can be determined such that after the final print-off position, each printing plate positioned on the plate cylinder has a defined residual ink layer thickness and is therefore virtually cleaned.
  • decolorizing color images are printed with reduced inking, which is due to the decreasing ink layer thickness, since the ink supply to the printing plate and the blanket cylinder is cut off from the inking unit.
  • the surfaces of printing blanket and printing plate are largely cleaned and the risk of drying of ink is avoided there safe.
  • the inking rollers are turned off and the remaining on blanket and plate cylinder excess ink is already removed during braking of the printing machine before the flying plate change without the input of additional waste sheet from the selected printing unit. But as the printing press decelerates, it usually causes waste, so it can be used directly for decolorizing.
  • the color and dampening rollers are turned off at the time of a preselectable number of sheets before the final print-off of the plate cylinder when the blanket cylinder.
  • a simultaneous shutdown of inking and dampening rollers is implemented. In practice it has been found that when stopping the inking rollers while the dampening rollers are still employed, resulted in a smaller color decrease by the sheets from the blanket cylinder and also between the plate cylinder and blanket cylinder. This was a worse cleaning effect for the plates detected.
  • the delayed or separate shutdown of the dampening rollers can be useful as a procedure for special subjects, substrates or printing inks.
  • the prolonged humidification of the printing plate may be advantageous if it is still desired a cleaning effect on the printing plate against contamination of a kind other than printing ink. This is conceivable for subjects with low color coverage or coverage or for dusty substrates.
  • certain printing inks can tend to re-splits, which can be avoided by an extended moistening of the printing plate.
  • the process of decolorization is adaptable when carried out on a printing press equipped with one or more coating units for coating the printed sheets.
  • the method of decoloring may be carried out alone or combined with a method of paint-coating.
  • the shutdown of the coating is at least offset to the shutdown of the inking or dampening rollers. This ensures that the waste sheets are still sufficiently covered with paint or coating medium during decolorization. It is thus avoided that moist printing ink present on the waste paper sheet can split back onto a coating plate mounted on a paint form cylinder of the coating unit or a correspondingly attached printing blanket and can dirty it in an undesired manner.
  • a paint application roller can be parked in the coating unit from the paint form cylinder. This achieves a significantly faster reaction than if the paint supply were switched off.
  • a splitting of ink on elements of the coating is reliably avoided and allows a precisely controllable removal of the residual paint from the coating.
  • the paint removal should therefore only take place when the amount of ink remaining on the plate cylinder and the blanket cylinder has been minimized. Therefore run here a predetermined number of sheets for removing ink when parked ink and possibly dampening rollers in employed on the plate and the impression cylinder blanket cylinder by the printing press, while the or the coating units are still in operation and a splitting of ink from the printed sheet is reliably avoided on lacquer forms or blankets in the coating units. Only then is a possibly predetermined number of further printed sheets for the removal of the remaining coating or residual coating medium in the coating plants promoted by the printing press and the coating plants.
  • process data for decolorizing or repainting are now also obtained from setting data which are available in a pre-stage device for a print job and in particular as data related to the print image, such as for producing a printing plate.
  • This data can be stored and evaluated in a work preparation station or a control station of a printing machine.
  • the optimal number of printed sheets for decolorizing the printing plate or printing plates is calculated by a control computer, which is assigned to the printing press or is present within the printing press itself.
  • the invention determines that printing unit of the printing press, which has the highest degree of contamination, the total number of necessary Entfärbungsbogen. These sheets are pronounced as spoiling sheet because of the shutdown of the ink supply quickly adjusting sub-coloration and must be separated in or after the sheet delivery of the voucher.
  • An inventive development of the method described above may consist in that by means of a device for inline color density measurement or by means of in-line sheet inspection systems, optionally including an image analysis, the number of required Entfärbungsbogen is determined at the used for decolorizing printing or waste sheet.
  • the color or coating occupation of the working units from the printing process which is to be assessed as soiling at the end of a print job is determined on the basis of specific data and used to determine the decolorizing or decoating process.
  • the procedure is such that if, during the process of decolorization, the decolorization sheet falls below a certain color density value, the paper feed at the feeder is stopped. Then, namely, the cleaning of the printing plate is considered sufficient.
  • the operator is only to select the function for decolorizing and the control of the printing press generates the process steps of decolorization with selection of the required Entfärbungsbogen and the respective required circuit of the printing units during decolorization independently.
  • a control loop is established.
  • control signals are generated which determine the number of decolorizing sheets required or allow further delivery of printed sheets as decolorizing sheets.
  • the printing ink or the printing unit with the greatest degree of contamination on plate and blanket cylinder is automatically selected. This in turn can be done on the basis of the preliminary stage data or on the basis of the setting of the color metering, wherein large ink supply also means great contamination in the printing unit or on the printing plate.
  • the deinking process can be initiated and run fully automatically within a defined order structure on the basis of the data of a circulation counter of the respectively printed credit.
  • the same measures described above can be used in the paint removal to liberate or clean a paint form of excess paint by after the printing process or controlled during interruptions of a printing process, the printing press continuous sheet.
  • the number of Ablack réellesbogen is calculated by the dependent on the well volume of the anilox roller paint amount, the type of paint and the nature of the paint form, which may be formed over the entire surface or for spot painting, as well as the number of coated during the print job sheet.
  • the operating data mentioned here are also - as described in connection with the printing units - a part of the order data, which are stored in a work preparation station or a control station of a printing press.
  • the data of the anilox roller used can alternatively also be identified via logistics data or via RFID system.
  • the number of Ablack istsbogen can be determined via an inline paint layer thickness measurement. Accordingly, if a certain minimum paint layer thickness is exceeded, the paper feed can be stopped at the feeder.
  • the decolorizing or Abpackieren also occur before reaching a selected edition height. Then the respective process is initiated by a targeted interruption of the current printing process from the control center of the printing press. Thereafter, the printing process can be restarted or resumed with cleaned printing plates and blankets. The print interruption can then be connected with respect to the control so with the machine control that automatically or manually preselected the decolorization of the printing plates or the Abelack Schl of / the coating modules takes place.
  • a preselection mode can also be provided, by means of which it is possible to determine whether the printing machine is shut down with or without a decolorizing or decoating process.
  • the adjustment can be made automatically if there are certain conditions such as heavy paint, paper prone to contamination, or sensitive inks. Again, this can also be done in conjunction with measuring devices (preferably arranged inline) for detecting color densities or for sheet inspection.
  • Both methods can be carried out in machines with inline coating in one operation.
  • the printing or coating module for which the highest number of trailing sheets is calculated determines the actual number of decolorization and decoating sheets.
  • the combination of decolorization and paint removal takes place with respect to the avoidance of ink residues into the coating unit as described above.
  • the combination of stopping of inking and dampening rollers process according to the procedure described above.
  • the drawings are in FIGS. 1 and 2 sheetfed offset printing machines suitable for carrying out the invention again.
  • a printing machine 1A and 1B with a plurality of printing units 3 at least one coating unit 4 and optionally further processing units in the form of punching, cutting or embossing units 5, and numbering or calendering units 6 are provided. Furthermore, a cold foil unit 23 can be provided for transferring a metallic film layer onto a printing material within two printing units 3.
  • a stack conveyor 12 is provided in connection with a feeder 14 and a stack transport system 13 with automatic stack feed to the printing machine 1A.
  • a stack conveyor 2 is provided in connection with a boom 22 and a corresponding stack transport system 7.
  • the sheet feed can be made underfolded from a roll-bow feeder to the feeder 14 by means of a roll unwind 16 and a cross cutter 15.
  • the printing units 3 are designed as offset printing units for automated operation.
  • facilities are provided by means of which all settings and the supply of supplies can be made without manual intervention.
  • the printing units 3 of the printing presses 1A, 1B each have automated inking units 30 and dampening units 31. These are equipped with means for remote control and adjustable adjustment for lifter strokes, trimming inserts and strokes, selectable roll centering and shutoff positions, variations in duct speed, etc.
  • the plate cylinders (forme cylinders) of the printing machines 1A, 1B are each provided with a direct drive independent of the main drive.
  • a simultaneous plate change and / or simultaneous Washing functions and / or simultaneous color advance programs and / or flying order change are performed.
  • the design can be designed as a paint modules or Inlinelackierwerk on the printing unit.
  • an automatic paint supply including temperature control of the paint and / or viscosity control system for the paint is furthermore provided.
  • automatic printing plate changing devices for the plate and forme cylinders are provided in the printing units 3 and possibly in the coating units 4 of the printing presses 1A, 1B. By means of these devices printing plates can be easily replaced when changing jobs.
  • automated washing devices 32 for the blankets, inking units, dampening units, printing cylinders, forme cylinders and the paint circuit are provided in the printing units 3 and coating units 4 of the printing presses 1A, 1B.
  • the sheet transport through the printing machine 1A, 1 B takes place in the printing units by means of automated fan webs 18, transfer drums 19 and sheet guiding systems and in the boom by means of sheet guide paths 21.
  • a so-called turning device 20 is provided in the printing machine 1A.
  • a curved switch 8 or a double boom 9 are provided.
  • the safe and smear-free display powder dusting 11 which is based on the Drucksujet or the sheet format, and end dryer 10 and intermediate dryer are provided.
  • the quality is monitored by means of in-line inspection systems 9 in a printing press 1 B and / or inline densitometry devices 8. These can optionally be arranged as linline color density measuring and control device or as an inspection system before and after a sheet turning device to capture both sides of the substrate and to be able to evaluate.
  • the machine control station is equipped with memory functions for all printing machine and order-related setting and measured values, so that they can be called up for repeat jobs or current evaluations.
  • the machine control center and the machine control are further characterized by an integration into a printer network with prepress, logistics, material supply, other printing presses and pre- and post-processing.
  • a good sheet counter and a waste sheet counter are used.
  • Consumption data collection is also provided for all substances required in the printing process (eg printing ink, dampening solution, paint).
  • substances required in the printing process eg printing ink, dampening solution, paint.
  • pressure-process-relevant and order-relevant data are constantly obtained, which also include faults and adjustment corrections.
  • a double inline measuring and control system 8 For printing machines 1A with turning device 20, in which substrate is printed on the front and back, preferably a color matching for the front and back of the sheet by a double inline measuring and control system 8.
  • the sheet front side is measured before the sheet turning 20 and after completion of the backside printing, the image of the backside is evaluated.
  • a double inline inspection system is provided, which is automatically coupled to the control device of the printing press 1A for the case of the reversing operation.
  • the integration of self-learning processes is provided. These affect washing cycles, simultaneous washing preferably e.g. in connection with stack change operations and measurable conditions of contamination of the printing machine.
  • the inline density measuring devices 8 and the inline inspection device 9 are used in conjunction with the automated inking units 30, dampening units 31 and washing devices 32.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
EP08784602.8A 2007-07-11 2008-07-03 Abfördern von druckfarbe Active EP2167318B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08784602T PL2167318T3 (pl) 2007-07-11 2008-07-03 Odprowadzanie farby drukarskiej

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007032598 2007-07-11
DE102008029998A DE102008029998A1 (de) 2007-07-11 2008-06-24 Abfördern von Druckfarbe
PCT/EP2008/005413 WO2009007050A2 (de) 2007-07-11 2008-07-03 Abfördern von druckfarbe

Publications (2)

Publication Number Publication Date
EP2167318A2 EP2167318A2 (de) 2010-03-31
EP2167318B1 true EP2167318B1 (de) 2014-11-19

Family

ID=40121679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784602.8A Active EP2167318B1 (de) 2007-07-11 2008-07-03 Abfördern von druckfarbe

Country Status (8)

Country Link
US (1) US20100199867A1 (enExample)
EP (1) EP2167318B1 (enExample)
JP (1) JP2010532724A (enExample)
CN (1) CN101687415A (enExample)
DE (1) DE102008029998A1 (enExample)
DK (1) DK2167318T3 (enExample)
PL (1) PL2167318T3 (enExample)
WO (1) WO2009007050A2 (enExample)

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DE102004039536A1 (de) * 2004-08-13 2006-02-23 Man Roland Druckmaschinen Ag Verfahren zum Steuern einer Verarbeitungsmaschine für Bogenmaterial
JP2007090655A (ja) * 2005-09-28 2007-04-12 Mitsubishi Heavy Ind Ltd 印刷機及び水均しローラの洗浄方法
JP4859023B2 (ja) * 2005-10-03 2012-01-18 日本ボールドウィン株式会社 ブランケット洗浄方法
DE102005062373A1 (de) * 2005-12-24 2007-06-28 Man Roland Druckmaschinen Ag Verfahren zum Steuern einer Verarbeitungsmaschine für Bogenmaterial
WO2007073834A2 (de) * 2005-12-27 2007-07-05 Manroland Ag Verfahren zur reinigung von druckplatten

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CN101687415A (zh) 2010-03-31
JP2010532724A (ja) 2010-10-14
WO2009007050A3 (de) 2009-04-02
DE102008029998A1 (de) 2009-01-15
PL2167318T3 (pl) 2015-04-30
DK2167318T3 (en) 2015-02-23
US20100199867A1 (en) 2010-08-12
EP2167318A2 (de) 2010-03-31

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