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. Furthermore, the invention relates to a method for operating a printing press according to the preamble of claim 14.
• 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 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.
• the number of sheets to be used is preselected. The cleaning of the paint forme cylinder is then much less expensive.
• EP 0 983 852 B1 discloses a method and a device for regulating the layer thickness of a color film for a multicolor printing press.
• This publication takes into account that plate cylinders are provided in printing units, which hold a printing plate carrying the printing plate, wherein such printing plates must be replaced.
• the printing plates are to be supplied in different ways with printing ink.
• it is proposed to print a preselectable number of printed sheets with the ink supply switched off at the inking unit in the printing units where a printing plate is to be replaced. This results in a reduction of the ink layer thickness on the ink rollers of the inking unit, so that the conversion to a new color profile is facilitated.
• 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.
• 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 on 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 take place 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 réellesbogen 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 réellesbogen be determined by means of inline Lack Mrs- thickness measurement, so that when it falls below a minimum coating thickness, the paper feed is stopped at the feeder.
• the printing or coating module for which the highest number of trailing sheets is calculated determines the actual number of sheets.
• the operations of paper feed to the printing press, stopping the co-working with the forme cylinder / pressure plate applicator rollers or separation of the Formzylin- relative to the impression cylinder so linked together that a clamped on the plate cylinder pressure plate at the end of a print job and there finished printing process itself is largely cleaned.
• 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 dye 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.
• the blanket cylinder is largely colorless and no longer needs to be cleaned with great effort by means of a washing device.
• the printing plates are almost color-free and can easily be replaced by plate changing machines without polluting them.
• the inking and dampening rollers are turned off from the plate cylinder at a pre-calculated or metrologically determined point in time for a certain number of sheets before the final printing shutdown.
• a simultaneous stopping of dyeing and dampening rollers is provided according to the invention, since when turning off the inking rollers alone, a smaller 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 dyeing or dampening rollers in the context of decolorization.
• 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 press has a sheet feeder and, in the area of printing units, in each case at least one inking unit and the printing units connected downstream have a sheet delivery arm. Usually, several printing units are connected in succession. Printing sheets to be printed are moved through the printing press via a plurality of sheet guiding cylinders, 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.
• 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 print image over the blanket cylinder to 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 Weil assigned 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. This ensures that at the end of a print job nor the printing press continuous sheet pressure ink on the blanket cylinder from the plate cylinder decrease without ink is supplied from the inking unit to the printing plate.
• a residual ink layer is quickly removed from the blanket and plate cylinder, respectively the printing plate. The thus largely clean printing plate can be removed without danger via automatic plate changers and a new printing plate can be supplied.
• 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. If necessary, appropriate lead times or angles are provided depending on the machine speed so that the actuators react in good time.
• 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.
• As an adjustment can be further given that remains at dampening for the time during the run the Entfärbungsbogen with production speed. After that it can be turned off. Individual dampening units can still be turned off.
• 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 is so • determinable that after the final print-off position each positioned on the plate cylinder printing plate has a defined residual ink layer thickness and thus is 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. For example, the surfaces of printing blanket and printing plate are largely cleaned and the risk of ink drying is reliably avoided there.
• Sheet-fed printing presses are also known in which plate cylinders are provided with separate, so-called individual drives, which are separated mechanically from the other drives of the printing press.
• a so-called flying plate change is possible, in which with the help of individual drives and the exchange of printing plates on individual selected plate cylinders is possible.
• the further printing plates remain on the corresponding plate cylinders, so that only a partial image of the entire printed image is exchanged.
• Such a procedure may be useful if partial image contents, eg explanations in constantly changing languages, are to be printed in an otherwise static color image.
• the plate changing process taking place during a flying plate change corresponds to a conventional plate change, the replacement of a specific printing plate and the subsequent use of this printing plate with a new printing plate for subsequent further printing.
• the procedure is slightly changed for the flying plate change, since a delay of the printing process is useful to take the relevant printing unit back into operation can.
• the advantages of the method also apply to the single printing unit with individual drives.
• 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 usually already generated waste during braking of the press ", it can be used directly for discoloring.
• the inking and dampening rollers are turned off the plate cylinder at the time of a preselectable number of sheets before the final printing shutdown.
• a simultaneous shutdown of dyeing and dampening rollers is implemented.
• the delayed or separate shutdown of the dampening rollers can be useful as a method 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. Then, the method of decoloring may be carried out alone or combined with a method of paint-coating.
• the shutdown of the coating is done at least offset to the shutdown of the dyeing or dampening rollers. This ensures that the waste sheets are still adequately covered with paint or coating medium during decolorization. This avoids that existing on the waste paper wet ink on a mounted on a paint cylinder of the coating unit paint plate or a suitably attached
• 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. Thus, a back-splitting of printing ink on elements of the coating unit 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 in parked dyeing 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 function and a splitting of Printing ink is reliably avoided by the printed sheets on lacquer forms or printing blankets in the coating plants. 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 precursor device for a print job and, in particular, as data relating to the printed image, such as for the production of a printing plate.
• This data can be stored and evaluated in a work preparation station or a control station of a printing press.
• that printing unit of the printing press which has the greatest degree of contamination determines the total number of necessary inking sheets. These sheets are pronounced as spoiling sheet because of the shutdown of the ink supply fast adjusting subcolouration and must be separated in or after the sheet delivery of the good.
• Jet printing device (marking) are provided.
• the decolorizing sheets can be found in a further processing by means of suitable detectors and discharged.
• a so-called bow-type soft- ware can be used, which serves to print single sheets on its own
• the separation of the discoloration sheet can continue to be done in a double pile delivery on a separate discard pile.
• 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 to be evaluated as soiling at the end of a print job is determined on the basis of specific data and used to determine the decolorizing or paint removal 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 necessary decolorization sheets or enable the further supply of printed sheets as a decolorization sheet.
• 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 process of bleaching can be initiated and executed 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 likewise - as described in connection with the printing units - a component of the order data 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 Abelackie- can arc over an inline paint layer thickness measurement can be determined. Accordingly, if a certain minimum paint layer thickness is exceeded, the paper feed can be stopped at the feeder.
• the decolorizing or Abpackieren can also be done before reaching a selected run 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 soiling, 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 staking of dyeing and dampening rollers process according to the procedure described above.
• the drawings show in FIGS. 1 and 2 suitable sheet-fed offset printing machines for carrying out the invention.
• a printing machine 1A and 1B having a plurality of printing units 3 at least one coating unit 4 and possibly 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 press 1A.
• a stack conveyor 2 in conjunction with a delivery arm 22 and a corresponding stack transport system 7 are provided.
• the sheet feed can be shallow from a. Roll-bow feeder to the feeder 14 by means of a roller handling 16 and a cross cutter 15 done.
• 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 devices for remote controllable adjustment of lifter strokes, trimming inserts and strokes, selectable roll centering and stopping 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 simul- tane washing functions and / or simultaneous Farbvorlaufprogramme and / or on-the-fly job changes 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.
• automated washing devices 32 are provided for the blankets, inking units, dampening units, printing cylinders, forme cylinders and the paint circuit in the printing units 3 and 4 coating units of the printing presses 1A 1 1B.
• the sheet transport by the printing press 1A, 1B takes place in the printing units by means of automated fan webs 18, transfer drums 19 and sheet guiding systems and in the delivery by means of sheet guiding 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 machine 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 storage functions for all press and order-related setting and measurement values, so that these can be called up for repeat orders 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. To monitor the printing process and the print job data, 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). As a result, pressure-process-relevant and order-relevant data are constantly obtained, which also include faults and adjustment corrections.
• color matching is preferably carried out for the front and back sides of the printed sheets by means of a double inline measuring and control system 8.
• the sheet front side is excluded prior to the turning operation 20. measure and evaluate the image of the back after completion of the backside printing.
• 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)

Priority Applications (6)

Applications Claiming Priority (4)

Publications (2)

Family

ID=40121679

Family Applications (1)

Country Status (8)

Cited By (2)

Families Citing this family (10)

Family Cites Families (17)

• 2008
  • 2008-06-24 DE DE102008029998A patent/DE102008029998A1/de not_active Withdrawn
  • 2008-07-03 US US12/668,175 patent/US20100199867A1/en not_active Abandoned
  • 2008-07-03 DK DK08784602.8T patent/DK2167318T3/en active
  • 2008-07-03 PL PL08784602T patent/PL2167318T3/pl unknown
  • 2008-07-03 CN CN200880024267A patent/CN101687415A/zh active Pending
  • 2008-07-03 JP JP2010515389A patent/JP2010532724A/ja active Pending
  • 2008-07-03 EP EP08784602.8A patent/EP2167318B1/de active Active
  • 2008-07-03 WO PCT/EP2008/005413 patent/WO2009007050A2/de not_active Ceased

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