EP1748892B1 - Procede pour reguler un transfert d'encre - Google Patents

Procede pour reguler un transfert d'encre Download PDF

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Publication number
EP1748892B1
EP1748892B1 EP05747180A EP05747180A EP1748892B1 EP 1748892 B1 EP1748892 B1 EP 1748892B1 EP 05747180 A EP05747180 A EP 05747180A EP 05747180 A EP05747180 A EP 05747180A EP 1748892 B1 EP1748892 B1 EP 1748892B1
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EP
European Patent Office
Prior art keywords
printing
temperature
roll
forme cylinder
adjustment
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Not-in-force
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EP05747180A
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German (de)
English (en)
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EP1748892A1 (fr
Inventor
Georg Schneider
Wolfgang Otto Reder
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP1748892A1 publication Critical patent/EP1748892A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/005—Ink viscosity control means
    • 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
    • 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

Definitions

  • WO 03/045694 A1 and the WO 03/045695 A1 Methods are known in which by tempering a cooperating with a printing ink rotating component of a printing unit a tack of the ink on the rotating component in a temperature range of 22 ° C to 50 ° C is kept substantially constant, the speed of the ink from the temperature on the lateral surface of the rotating component and its production speed depends.
  • the application consists in particular in a waterless printing unit, preferably in a printing unit for newspaper printing.
  • EP 1 262 321 A2 is a preferably operated in a waterless offset printing process printing machine with multiple inking units, wherein in each inking means for adjusting a temperature of a lateral surface of a forme cylinder is independent of a device for adjusting a temperature of a lateral surface of a Farbwerkswalze adjustable, with the setting of the respective device for adjusting the respective temperature of the respective lateral surface of a reduction in the viscosity of the ink is counteracted by a temperature increase during the printing process.
  • the EP 0 652 104 A1 discloses a printing unit for the waterless offset printing with a control device with a plurality of regulators which, to avoid buildup of ink on a transfer cylinder of the printing unit depending on the deviation of each with a thermal sensor to the transfer cylinder or the Transfer cylinder associated with the form cylinder of the printing unit or a Farbreibzylinder of the forme cylinder associated inking temperature detected in each case by a desired value in each case a control valve for controlling the respective cylinders supplied coolant quantity, eg. As water controls.
  • During printing should by the controlled amount of coolant constant keeping the temperature of a arranged on the forme cylinder printing form z. B. be possible in a temperature range of 28 ° C to 30 ° C.
  • a temperature control device in a printing unit wherein the rheological properties of the printing ink, such as its viscosity or tack, are influenced by the tempering.
  • the associated printing machine with a forme cylinder has a short inking unit with an ink fountain, an anilox roller and an inking roller. At least one of the inking rollers or the forme cylinder can be tempered by the tempering device. The temperature is controlled by cooling or heating either from the lateral surface of the inking rollers or the forme cylinder or inside the inking rollers or the forme cylinder.
  • the color box can also be tempered, in particular also the squeegee for doctoring off excess printing ink from the anilox roller.
  • the amount of ink transferred to the forme cylinder can be regulated, the optical density measured on the substrate serving as the signal quantity, with the help of the regulators associated with the tempering devices controlling their temperatures.
  • DE 102 45 702 A1 is a method for controlling the color guide in a substrate-processing machine with at least one inking unit and a computer known, the computer at least the physical properties of ink and / or substrates are known as data, the stored data in a stored in the computer color control model read in and with this color control model the optimal settings regarding the Color guide to be made before the start of printing or during the printing process, among which included in the color guide physical properties of the ink include, among other things, their viscosity and speed.
  • the DE 101 43 827 A1 is a method for controlling a transferable from an anilox roller of a printing press to a roller in contact with the anilox roller amount, in particular color or paint amount, by influencing a peripheral speed difference between anilox roller and roller known, the peripheral speed difference as a function of the printing speed of the printing machine so is controlled that the printed Medium density remains constant or approximately constant at least in a wide printing speed range. It may be provided that the printed medium density is raised by increasing the screen roller temperature or that the printed medium density is lowered by lowering the screen roller temperature.
  • the printed medium density is in each case the optical density which has a printed image transferred to a printing material, and not the material density of the printing medium.
  • a printing plate of a printing unit for waterless offset printing to about 28 to 30 ° C.
  • DE 41 08 883 A1 is a printing device with an impression cylinder and with a Farb Committeeswerk with at least one roller for transferring ink to a substrate known, wherein the substrate between the impression cylinder and the Farb Committeeswerk passes through, wherein the impression cylinder and / or Farb Committeeswerk divided in the axial direction into several thermal zones is, wherein the zones have individually controllable tempering devices for changing the viscosity of the ink located in the respective zone.
  • the DE-OS 19 53 590 discloses a printing unit with an inking unit and a dampening unit, which is temperature controlled by means of a tempering device.
  • a setpoint for the temperature can depend on influencing variables, eg. B. the printing speed, determined before the start of the printing process by proofs or adjusted by means of tables.
  • An advantageous upper limit of the temperature of the printing ink is indicated at room temperature.
  • ISO 12634 of 15.11.1996 gives details on the tack of an ink and ISO 12644 of 01.12.1996 details the viscosity of a printing ink and details of its measuring methods.
  • the invention has for its object to provide a method for adjusting a transfer of ink.
  • the achievable with the present invention consist on the one hand, that by adjustable temperature control on different parameters of the ink, in particular their viscosity and tack, targeted, ie selective and needs influenced influence on the one hand to adapt transport of the printing ink prevailing in the printing machine operating conditions and on the other hand to avoid picking and / or toning of the ink by one hand z.
  • an anilox roll is kept at least approximately constant, so that with an increase in the production speed of the printing press despite a concomitant decrease in the assets of the anilox roll for transferring ink due to an increasingly incomplete emptying of their wells a consistent amount of ink is promoted to the substrate, and on the other hand by a dependent of the production speed of the printing machine setting the temperature on the lateral surface, in particular the forme cylinder, the tack of the ink transported from the forme cylinder is held valuewise in a suitable range for the printing process, so that in particular the plucking of the ink on the surface of the printing material is avoided.
  • the printing ink is dependent adapted from the production speed of the printing press in terms of their cleavage and adhesion by an appropriate adjustment of their temperature to the currently existing printing process, the adjustment of their temperature is carried out indirectly by adjusting the temperature on the lateral surface of a rotating body leading to this ink.
  • the different timing for performing the adjustment of the temperature of the ink and to carry out the adjustment of the production speed of the printing press is taken into account in an intended change in the production speed of the printing machine.
  • the possibility is granted, a machine specification within certain limits z. B. manually and thus to perform a directed to the production of a good quality for the printed product fine-tuning. All of these measures help maintain the quality of a printed product produced by the printing machine at a high level despite a change in the production speed of the printing press.
  • the Fig. 1 shows in a highly simplified representation by way of example four juxtaposed printing units 01; 02; 03; 04 an offset rotary printing machine each with a forme cylinder 06; 07; 08; 09, a transfer cylinder 11; 12; 13; 14 and an impression cylinder 16; 17; 18; 19, wherein for the production of printed on both sides printed products each impression cylinder 16; 17; 18; 19 is preferably also formed as a transfer cylinder, which in turn cooperates with a associated therewith (not shown) form cylinder.
  • an image sensor 22, z. B. a color camera 22, preferably a digital semiconductor camera 22 with at least one CCD chip, arranged and directed with its image pickup area preferably directly and directly on the print carrier 21, wherein the image pick-up area of the image sensor 22 z. B. detects the entire width of the print carrier 21, wherein the width of the print carrier 21 extends transversely to the transport direction through the printing press.
  • the image sensor 22 thus detects an electronically evaluable image z. B. of the entire width of the printed paper web 21, wherein along the width of the paper web 21, at least one printed image on the print carrier 21 is applied.
  • the image sensor 22 is z. B. formed as a surface camera 22.
  • the image sensor 22 transmits the correlated with the recorded image data to a suitable evaluation unit 23, in particular a program-controlled electronic computer system 23, the z. B. is arranged in a belonging to the printing press control room.
  • a suitable evaluation unit 23 in particular a program-controlled electronic computer system 23, the z. B. is arranged in a belonging to the printing press control room.
  • Parameters relevant for the printing process can be checked by an analysis and evaluation of the recorded image carried out in the evaluation unit 23 and corrected, if necessary, by programs running in the evaluation unit 23 so to speak automatically, ie program-controlled.
  • the evaluation and correction of all relevant parameters for the printing process takes place here practically at the same time by means of the same evaluation unit 23.
  • the image acquired by the image sensor 22 during an ongoing production of the printing press and supplied in the form of a data set of the evaluation unit 23 is evaluated as to whether the current Image recorded and evaluated printed image compared to a previously recorded and evaluated print image a Tonwertver selectedung, in particular a dot gain, ie a currently recorded image is checked in the current printing process in comparison to a reference image.
  • the dosage and / or the supply of the printing ink in the printing machine is determined by at least one outgoing from the evaluation unit 23, via a data line 24 and at least one of the printing units 01; 02; 03; 04 modified first control command to the effect that the Tonwertver selectedung is minimal by a subsequent to the currently tested image applying ink.
  • a picture of a print image in its color impression following the currently checked image corresponds better to a previously checked image of a print image, ie the reference image.
  • the control and regulation of the Tonwertver selectedung is therefore important in the printing process, the color balance or gray balance and thus the color impression of the produced Print products - possibly within permissible tolerance limits - to keep as constant as possible, which is an important quality feature for printed matter.
  • the amount of data generated from the image of the printed image and transferred to the evaluation unit 23 is used to check the registering of the printed image applied on the print substrate 21, in particular for checking and optionally correcting a color register of a printed image printed in multicolor printing.
  • at least one preferably motorized adjustable register is provided, for. B.
  • a circumferential register or a page register optionally also a diagonal adjustment for at least one of the forme cylinder 06; 07; 08; 09 relative to its associated transfer cylinder 11; 12; 13; 14, wherein the register by at least one outgoing from the evaluation unit 23, guided over a data line 26 and at least one of the printing units 01; 02; 03; 04 acting second control command is regulated in response to this test to the effect that for a recording of the evaluated image subsequent printing image results in a maximum register accuracy.
  • An adjustment or adjustment of the registers is thus calculated by the evaluation unit 23 from the image data which the image sensor 22 provides to the evaluation unit 23. With the adjustment or adjustment of the side register and fan-out conditional transverse strain can be counteracted, this transverse strain occurs in particular in printing machines, which have a so-called four-tower design for their printing units.
  • the printing machine is preferably formed undulating.
  • a printing press preferably have the forme cylinder 06; 07; 08; 09 via individual drives, by the drives for the impression cylinder 16; 17; 18; 19 are mechanically decoupled, so that the phase position or the angular position of the forme cylinder 06; 07; 08; 09 against the counter-pressure cylinders 16; 17; 18; 19 by an appropriate control or regulation, preferably the drives of the forme cylinder 06; 07; 08; 09 can be changed whenever an evaluation of the from the print carrier 21 by means of the image sensor 22 recorded image this appears to be necessary.
  • the control or regulation of the printing unit in particular the drives of the forme cylinder 06; 07; 08; 09th
  • a control command generated by the evaluation unit 23 from the image content of the image recorded by the print image acts on a control device or control device of a preferably position-controlled electric motor for rotary drive during printing at least from one of the forme cylinders 06; 07; 08; 09, the transfer cylinder 11 assigned to it; 12; 13; 14 or impression cylinder 16; 17; 18; 19.
  • the electric motor of the forme cylinder 06; 07; 08; 09 is preferably coaxial with the axis of the forme cylinder 06; 07; 08; 09 arranged, wherein the rotor of the motor with a pin of the axis of the forme cylinder 06; 07; 08; 09 is preferably rigidly connected in the manner as z. B. in the DE 43 22 744 A1 is described.
  • the in different printing units 01; 02; 03; 04 of the printing machine arranged impression cylinder 16; 17; 18; 19 can, such. B. in the EP 0 812 683 A1 described, for. B. by a train of gears mechanically be connected to each other and z. B.
  • the forme cylinder 06; 07; 08; 09 or the associated transfer cylinder 11; 12; 13; 14 with regard to their drive from the counter-pressure cylinder 16 assigned to them; 17; 18; 19 remain decoupled.
  • Between the forme cylinder 06; 07; 08; 09 and its associated transfer cylinder 11; 12; 13; 14 may be a coupling z. B. by means of intermeshing gears, so that the forme cylinder 06; 07; 08; 09 and its associated transfer cylinder 11; 12; 13; 14 are driven by the same drive.
  • the control device or control device of the drives at least the forme cylinder 06; 07; 08; 09 is z. B. integrated in the evaluation unit 23.
  • the control or regulation of the phase position or the angular position of the forme cylinder 06; 07; 08; 09 against the counter-pressure cylinders 16; 17; 18; 19 takes place with respect to a fixed reference setting, so that the forme cylinder 06; 07; 08; 09 with respect to the associated counter-pressure cylinder 16; 17; 18; 19 may have a leading or trailing rotation, wherein the relation of the rotations of the forme cylinder 06; 07; 08; 09 and its associated impression cylinder 16; 17; 18; 19 is set in dependence on the image content of the image sensor 22 recorded image and also tracked with the control device or control device of their drives.
  • phase position or angular position of each other in the printing process downstream form cylinder 06; 07; 08; 09 be controlled or regulated with respect to a fixed reference setting, which in particular in the multi-color printing of a successive printing units 01; 02; 03; 04 of the printing press color printed matter is of importance. If the picture taken of the print image, which preferably has a plurality of colors, shows that for a print in one of the printing units 01; 02; 03; 04 verlacten ink correction needs, is the evaluation unit 23 to the relevant printing unit 01; 02; 03; 04 from the detected interference counteracting control command.
  • control unit to be controlled by the evaluation unit 23 via setting commands, z. B. the actuators for controlling the supply of the printing ink and the drives for controlling the peripheral register or the page register, are connected in the printing machine to a data network connected to the evaluation unit 23, are the data lines 24 provided for transmitting the first and second positioning commands; 26 preferably realized by the data network.
  • the examination of a tone value change that occurs in the printing process and the check for register integrity are advantageously carried out simultaneously in the evaluation unit 23 by data processing running in parallel branches.
  • these two tests are carried out continuously in the current printing process, advantageously at the end of the printing process and also for each individual printed copy produced.
  • the check for register validity initially refers to a congruent coincidence in the position of the printed image or type set between perfecting or between the top and bottom in the production of double-sided printed matter.
  • the test also includes z.
  • check the passport d. H. the verification of the intended accuracy, which have individual partial colors when overprinting in multi-color printing.
  • Register accuracy and register accuracy play an important role in multicolor printing.
  • the image sensor 22 is advantageously a lighting device 27, z. B. associated with a flashlamp 27, wherein from the flashlamp 27 emanating short-term flashes of light fast motion processes, as they represent the printing process, seem to be stopped by a stroboscopic method and make it observable to the human eye.
  • the detection of the printed image carried out with the image sensor 22 can also take place in or on a delivery 28 of the printing press, which is described in US Pat Fig. 1 by a dashed representation of the image sensor 22 and the associated lighting device 27 as a possible option for capturing the printed image behind the last printing unit 04 of the relevant printing side or at the end of the printing press is shown.
  • the image sensor 22 and optionally the associated lighting device 27 By an appropriate choice of the image sensor 22 and optionally the associated lighting device 27, the detection of the image on a visually invisible spectral range, such. As the infrared or ultraviolet range or be moved there. As an alternative to the preferred area camera 22 with a flashlamp 27, the use of a line camera with a permanent lighting is possible.
  • each printed copy is subjected to a check, in the current printing process, i. H. in the print run, a trend for both the Tonwertver selectedung and for the registration of successively produced printed copies recognizable.
  • the printed copies can be classified into groups of different quality levels and marked as reject copies if an allowable tolerance limit is exceeded.
  • Committee copies can be discharged in a controlled manner by the evaluation unit 23 or, in particular, in a sheet-fed printing machine in the delivery 28, at least deposited on a separate storage stack 29.
  • at least one third positioning command which is directed via a data line 31, is issued.
  • a rotary encoder 32 is installed, wherein the current Rotary encoder 32 in a fixed ratio to the speed of that transfer cylinder 11; 12; 13; 14 at which the image sensor 22 detects the images.
  • the rotary encoder 32 outputs its output signal to the evaluation unit 23 and / or also to the image sensor 22.
  • the output signal of the rotary encoder 32 is used inter alia as a trigger for the flash lamp 27.
  • the image detected by the image sensor 22 and supplied in the form of a data quantity to the evaluation unit 23 is preferably displayed on a monitor of an input and output unit 33 connected to the evaluation unit 23 and standing in bidirectional data exchange.
  • the input and output unit 33 provides correction options for at least one of the mentioned controls by allowing manual inputs and / or triggering of at least one control command.
  • the evaluation unit 23 has a memory 34 u. a. for storing captured image sequences and for storing data useful for logging and accompanying documentation of the quality of the printed matter as well as for statistical analysis of the printing process. It is of advantage if the evaluation unit 23 can provide the data evaluated and / or stored in it through a corresponding connection 36 to a company network.
  • the evaluation unit 23 For the comparison of data carried out by the evaluation unit 23, which correlate with an image currently recorded during ongoing production of the printing press, with data of a previously generated image, it may be provided that the data of the previously generated image is provided with a prepress preceding in one of the printing press correlated, wherein a data processing device of the prepress (not shown) is connected to the evaluation unit 23 and the data of the previously generated image of the evaluation unit 23 passes.
  • a data processing device of the prepress (not shown) is connected to the evaluation unit 23 and the data of the previously generated image of the evaluation unit 23 passes.
  • the data of the previously generated image are generated as an alternative or in addition to data which correlate with an image recorded by the image sensor 22, and are sent to the evaluation unit 23 for Evaluation provided.
  • Prepress data correlated with the print image forms the more accurate reference data for controlling or regulating the color register against data obtained from previously printed images in current production.
  • register control and color control based on an analysis of the image captured by the image with the image sensor 22 is possible by evaluating the image of the image with respect to various parameters relevant to the printing process in a single evaluation unit 23, and simultaneously inspecting the image Print image to assess the quality of the printed matter.
  • the register control is based on a register measurement in the printed image. After all printing inks required for the printed image have been printed, the entire printed image is preferably acquired by the camera at the end of the printing press.
  • the detected printed image is preferably decomposed into the color separations CMYK customary in printing technology and an analysis of suitable print image sections and relative position determination of a color separation with respect to a reference color separation by correlation methods with a previously acquired or obtained reference print image.
  • the reference image or reference value for image section or a print image mark (density target) is z. B. either from the prepress stage, which has the advantage that the reference image is already present in the individual color separations, or it will be a reference image, for. B. a printed image having reference sheet, used for the evaluation of a pressure of the printed image, this reference image must be additionally decomposed into the color separations.
  • This reference sheet is recorded after the image has been adjusted manually once so that all printed inks are properly positioned relative to each other and thus a proper one Color register is set.
  • This reference print image obtained in this way can be stored for subsequent repeat jobs, so that it is possible to fall back on this previously recorded reference image in the case of a repeat job.
  • the color register can also be adjusted automatically by the evaluation unit 23 without manual intervention, which leads to a further reduction of the waste in the case of a repeat job.
  • Suitable cutouts are selected based on which the position of the individual color separations is determined to the reference color separation. This is the so-called set position for the later register comparison.
  • This reference image including the color separations and the target position z. B. stored in memory 34.
  • the selection of the appropriate printed image sections can be done manually by the operator or automatically by the evaluation unit 23, z. B. for a presetting of the desired position, done.
  • Suitable printed image sections with regard to registration measurement are areas in which the printing ink to be measured dominates or exclusively occurs.
  • each print image is detected by means of the camera system and decomposed into the color separations CMYK.
  • the position of the individual color separations is now determined within the previously defined, suitable print image sections. This is done by comparison with the color separations from the reference print image z. B. by a correlation method, in particular a cross-correlation method.
  • the position of the color separations can be determined to be about 0.1 pixel of the camera resolution. If a stationary register offset is determined repeatedly for each signature, a high accuracy of the measured value is ensured by a suppression of stochastic scattering.
  • the determination of the position of the individual color separations takes place in the web running direction corresponding to the longitudinal register and in the transverse direction to the web running direction corresponding to the page register.
  • the position differences thus obtained are converted by the evaluation unit 23 into setting commands and used as correction signals to the adjustment system, i. H. to the drives, sent.
  • spot colors do not match the standard colors; H. the scales CMYK, mixed, but separately printed. Special colors are therefore also measured separately.
  • the areas in which special colors are printed must be specified.
  • suitable areas are now defined, in which the position of the color separation in the same manner as for the scale colors CMYK, d. H. the standard colors are determined.
  • the further procedure for register control for spot colors is identical to the procedure described above for standard colors.
  • the control of the ink feed is carried out as a reference variable via a temperature adjustable on the surface of the rotating body involved in the printing process.
  • the acquisition of the data over the entire web width or printing width only via one or more print image sections or special applied on the substrate brands.
  • the color density corresponds to a layer thickness of the ink applied to the substrate and can, for. B. be detected densitometrically, both inline, d. H. in the current printing process as well as offline, d. H. by measuring on printed copies ejected from the current printing process.
  • an adjusting device 37 is provided, which a signal with data from the evaluation unit 23 are supplied. For example, depending on z. B. from the deviation of a currently detected color density D 1 from a color density D 2 specified as the desired value, a change in the value determined by the setting device 37 by means of at least one tempering device 57; 58 set temperature on the lateral surface of at least one of the participating in the printing process, ink-transporting rotary body 43; 47; 53; 54 made. With regard to a fast, systematic and thus reproducible change z. B.
  • a functional relationship between the deviation in the color densities D1 and D2 and the temperature to be set be kept, this functional relationship z. B. in at least one characteristic, table or in another suitable, the correlation representing form z. B. is fixed graphically or electronically.
  • the adjustment device 37 may, for. B. be arranged in a belonging to the printing press control room.
  • the in the Fig. 2 illustrated printing machine is in particular designed as a rotary printing machine and has a printing unit 41, which at least one inking unit 42, a printing plate 44-bearing cylinder 43, z. B. has a form cylinder 43 executed printing cylinder 43, and a counter-pressure cylinder 46 has. Particularly advantageous is the solution described below for printing machines or operations at a web speed of more than 10 m / s, in particular greater than or equal to 12 m / s.
  • the printing form 44 is preferably designed as a printing plate 44 for the planographic printing (planographic printing plate 44), in particular for the waterless planographic printing (waterless planographic printing plate 44).
  • the printing unit 41 is z. B.
  • the transfer cylinder 47 forms with the impression cylinder 46 in a print-on position on a substrate 49, z. B. a printing substrate 49, a pressure point 51.
  • the impression cylinder 46 may be another transfer cylinder 46 of a non-designated further printing unit, or a non-ink leading impression cylinder 46, z. As a steel or a satellite cylinder, be.
  • the printing form 44 may be sleeve-shaped or else designed as one (or more) pressure plate 44, which is fastened or suspended with its ends in at least one narrow channel which does not exceed a circumferential width of 3 mm (indicated in FIG Fig. 2 ).
  • the elevator 48 on the transfer cylinder 47 sleeve-shaped or as (at least one) blanket be executed 48, which is also attached and / or tensioned in at least one channel. If the blanket 48 is designed as a multi-layer metal printing blanket, then the channel is also designed with the above-mentioned maximum width.
  • the inking unit 42 has a paint supply 52, z. B. a paint tray with a fountain roller or a lift, or a chamber doctor blade with ink supply, and at least one engageable with the forme cylinder 43 in a print-on position roller 53, z. B. an applicator roller 53.
  • the ink is transported in the example shown by the ink supply 52 via an executed as an anilox roller 54 54, the roller 53, the forme cylinder 43 and the transfer cylinder 47 on the substrate 49 (eg web-shaped or as a sheet). It can also be at least one more, z. B. a second, with the anilox roller 54 and the forme cylinder 43 acting together, dashed lines applicator roller 53 may be arranged.
  • the anilox roller 54 has on its lateral surface recesses or wells to with this ink from a reservoir 61 for the ink, z. B. scoop color box 61 contained in a printing ink and on an adjacent rotary body 53, z. B. the applicator roll 53 to transfer.
  • the printing unit 41 is designed as a so-called. "Printing unit for the waterless planographic printing” in particular “waterless offset printing” (dry offset "), ie that in addition to the supply of ink no further supply of a dampening solution for the formation of "non-printing” areas is required.
  • dry offset dry offset
  • the application of a moisture film on the printing plate 44 can be omitted, which otherwise in the so-called “wet offset” prevents the non-printing parts on the printing plate 44 from accepting printing ink.
  • waterless offset printing this is achieved by the use of special inks and the special design of the surface on the printing plate 44.
  • So z. B. take a silicone layer in waterless offset printing the role of assignable with dampening hydrophilic range of wet offset and prevent the printing plate 44 on the color recording.
  • the non-printing areas and the printing areas of the printing form 44 are achieved by the formation of areas of different surface tensions when interacting with the ink.
  • the non-printing areas are preferably formed as a silicone layer, a printing ink with a compared to the wet offset significantly higher tack is needed for this purpose.
  • the tack for example, according to "The web offset printing", Walenski 1995, the resistance with which the ink of the film cleavage in a nip or during the transfer of the ink in the printing zone between cylinder and substrate and counteracts.
  • the cylinders 43; 47 and the inking unit 42 tempered, in particular cooled, and kept at a constant temperature to the toning for to avoid the changing operating conditions during printing.
  • the tack of the ink in addition to the separation of printing and non-printing areas, however, also influences the thickness of a plucking in the interaction of a color-guiding cylinder 43; 47 with the substrate 49.
  • the substrate 49 as uncoated, low-density newsprint with very good absorbency, ie open-pored and with very low Wegschlagzeit executed, increases the risk of loosening caused by fibers or dust. This danger is but z. B. also used in web offset printing lightly coated or lightweight, coated paper grades with a coating weight of z. B. 5 - 20 g / m 2 , in particular 5 - 10 g / m 2 or even less before.
  • the temperature is particularly suitable for uncoated or coated papers with a coating weight of less than 20 g / m 2 .
  • the temperature of the ink-carrying cylinder 43; 47 then advantageous if it is found that the stroke is "pulled off” by increasing speed from the paper (at least partially).
  • one or more of the color-leading components such. B. in an advantageous embodiment of the form cylinder 43 designed as a printing cylinder 43 as farbfacedes component 43, and / or the ink itself, are heated simultaneously in dependence on the production speed V of the press, including a correlating with the production speed V of the printing press signal z. B. sensor on the ink-carrying transfer cylinder 47, z. B. with a rotary encoder (not shown), tapped and the adjustment device 37 (in Fig. 2 dashed lines) and / or the evaluation unit 23 is supplied.
  • the temperature on the lateral surface of at least one of the rotating bodies 43 involved in the printing process; 47; 53; 54, preferably of the forme cylinder 43, is not kept constant for all production speeds V in a specific temperature range, as otherwise usual in waterless offset printing, but has different setpoint values for different production speeds V.
  • the temperature is set by means of the adjusting device 37 as a function of the production speed V such that the tack of the printing ink at any desired production speed V lies in a predefinable window of tolerable tack values. For a higher production speed V, an increased setpoint value for the temperature of the corresponding component 43 or the printing ink is selected.
  • a regulation is now based, for example, on the principle that for the intended, imminent or currently set production rate V as a reference variable, a specific setpoint or maximum value for the temperature of the component 43 or the printing ink is provided as output variable on the basis of a systematic assignment.
  • the desired value or maximum value represents a presetting temperature, which in the first case corresponds to a temperature to be maintained and in the second case corresponds to an upper limit of an admissible temperature.
  • a photoelectric sensor 56 preferably an image sensor 56, in particular a
  • the CCD camera 56 preferably carried out inline acquisition of the currently on the substrate 49 by the printing process applied color density D1 and the comparison of this detection value with the intended in this pressure for the color density D2 setpoint, the temperature is varied and tracked until a sufficient match between the actual color density D1 and the target color density D2 is reached.
  • the values of the relationship may differ significantly from the above values.
  • the solution is still the common setting of the temperature of the forme cylinder 43 as a function of the production speed V, in such a way that it has a higher setpoint or maximum value in a range of higher production speeds V than for a range of lower production speeds V. Plucking between ink-guiding cylinder 43; 47 and the substrate 49 reduced and ideally almost prevented.
  • the above-mentioned relationships between a determined color density deviation and a temperature change and / or between temperature on the lateral surface of at least one of the rotational body 43 involved in the printing process; 47; 53; 54 and the production speed V of the printing press can be stored for different printing inks and / or types of printing material. During the printing operation, the relationship specific to the respective printing ink and / or the respective printing material is then used.
  • At least the anilox roller 54 and the forme cylinder 43 each have a respective acting from its interior on the respective lateral surface, preferably of a flowable tempering, z.
  • Water flowed through tempering device 57; 58, wherein the temperature at the lateral surface of the anilox roller 54 is adjusted, preferably controlled, with regard to the quantity of ink to be transferred therefrom and the temperature at the lateral surface of the forme cylinder 43, taking into account the production speed V of the printing machine to avoid picking and / or cloning or regulated.
  • the adjusting device 37 is formed as a control device 37 or as a control device 37 depending on the present case, whether the process is controlled or regulated. In the case of the embodiment as a control device 37, there is no feedback in the process via the photoelectric sensor 56 or the signals or data supplied by it.
  • the temperature (empirical) at which the desired color density can be determined on the product is determined, for example, in the run-up to production for the relevant pairing (s) of printing ink / paper at different production speeds V is.
  • the currently set temperature can be detected by means of at least one arranged on or at least close to the lateral surface of the anilox roller 54 thermosensor 59, the output of the adjusting device 37 or the evaluation unit 23 and then fed in response to a in the adjustment device 37 or in the evaluation unit 23 performed comparison of the current temperature with a temperature set as the desired value if necessary reset and thus tracked to promote the required color for the print image.
  • this is not additionally varied over the result of the output unit 23, but it correlates firmly with the production speed V of the printing machine.
  • the control or regulation of the temperature on the lateral surface of the anilox roller 54 is preferably independent of the control or regulation of the temperature on the lateral surface of the forme cylinder 43, so between the control or regulation of the temperature on the lateral surface of the anilox roller 54 and the control or regulation of the temperature on the lateral surface of the forme cylinder 43, as a rule, there is no rigid positive coupling and therefore the tempering devices 57; 58 of the adjusting device 37 are individually actuated and thus individually adjustable.
  • the setting of the temperature control 57; 58 is preferably carried out by a remote adjustment, ie by a setting made by a control center.
  • different tempering agents can be used for the anilox roller 54 and the forme cylinder 43.
  • the flow of the respective Temperianssstoff straines preferably each individually and independently both for the temperature control means of the anilox roller 54 leading lines and for the temperature control means of the forme cylinder 43 leading lines interacting, adjustable by the adjustment device 37 valves (not shown) may be provided.
  • a temperature to be set for a value of the production speed V of the printing press on the lateral surface of the roller, in particular the anilox roller 54 and / or of the cylinder, in particular of the forme cylinder 43 is started or at least started with the setting of this required temperature the printing machine sets the new value of the production speed V, so that the temperature adjustment with respect to an intended change of the production speed V is advanced.
  • the ink-filled depressions or wells on the lateral surface of the anilox roller 54 increasingly imperfectly emptied, so that the deteriorating transfer behavior of the anilox roller 54 can be compensated by an adapted liquefaction of the ink to be transferred, wherein the reduction in viscosity the ink is advantageously carried out by means of the temperature to be set on the lateral surface of the anilox roller 54.
  • the tempering device 57; 58 formed such that with the tempering device 57; 58 associated adjusting device 37 due to a predetermined functional assignment for a value of the production speed V of the printing press on the lateral surface of the roller 54, in particular the anilox roller 54, and / or the cylinder 43, in particular the forme cylinder 43, set temperature within predetermined limits z. B. is changeable by a manually executed setting. As a result, a possibility of intervention in machine-specified settings is given, whereby within a maximum permissible tolerance range of z. B. +/- 5% or 10% with respect to the default value as needed a z. B. manually executed fine tuning is feasible.
  • the threshold values may be symmetrically or asymmetrically spaced from the default value, e.g. B. also define a tolerance range between - 5% and + 10%.
  • Fig. 3 shows by way of example a functional relationship, such as the temperature T at the Lateral surface of at least one of the rotating bodies 43 involved in the printing process; 47; 53; 54 may be dependent on the production speed V of the printing press.
  • the functional relationship can be linear or not linear. In any case, based on the functional relationship for a printing process determined inter alia by the printing ink used and the substrate 49 used as a function of the production speed V of the printing machine, a suitable value for the on the lateral surface of at least one of the rotating body 43 involved in the printing process; 47; 53; 54 temperature T to be set.
  • the value determined by machine for the at least one of the rotating bodies 43 involved in the printing process on the lateral surface; 47; 53; 54 to be set temperature T can within predetermined limits in the sense of fine-tuning z.
  • Fig. 4 also shows by way of example a functional relationship of an amount of ink delivered by the anilox roller 54 as a function of the production speed V of the printing press.
  • the viscosity of the ink to be delivered can be changed such that the delivery rate remains at least approximately constant with a change in the production speed V of the printing press.
  • the delivery rate of the anilox roller 54 may alternatively or in addition to its dependency on the production speed V of the printing machine be made dependent on a determined deviation of the currently detected color density D1 from the color density D2 predetermined as the desired value.
  • the second parameter of the printing ink ie its tack
  • the second parameter of the printing ink is set with decreasing values, so that the tack of the printing inks successively printed on the same printing substrate 49 preferably decreases in value.
  • This decrease in the value of the tack ie the decrease in the corresponding tack values of the respective printing inks, can be continuous from the first to the last printing ink printed in the printing press.

Claims (20)

  1. Procédé de réglage du transfert d'une encre d'impression, où un premier rouleau (54) disposé dans un mécanisme d'encrage (42) d'une machine à imprimer transfère une encre d'impression sur un cylindre porte-plaque (43), où une température est réglée sur une surface périphérique du premier rouleau (54) au moyen d'un système d'équilibrage de température (57) pourvu d'un dispositif de réglage (37), où le dispositif de réglage (37) règle une température à régler à la surface périphérique du cylindre porte-plaque (43) au moyen d'un système d'équilibrage de température (58) du cylindre porte-plaque (43), où les systèmes d'équilibrage de température (57 ; 58) règlent un paramètre de l'encre d'impression, où un premier paramètre de l'encre d'impression est réglé par la température réglée à la surface périphérique du premier rouleau (54), et un deuxième paramètre différent de la même encre d'impression à transférer vers le cylindre porte-plaque (43) est réglé par la température réglée à la surface périphérique du cylindre porte-plaque (43), où le premier paramètre d'encre d'impression réglé à la surface périphérique du premier rouleau (54) est relatif à la viscosité de celle-ci, caractérisé en ce qu'un relâchement du transport de l'encre d'impression à mesure que la vitesse de production (V) de la machine à imprimer augmente est compensé par le premier rouleau (54) au moyen d'une diminution de la viscosité de l'encre d'impression due à la température réglée à la surface périphérique du premier rouleau (54), et en ce que le deuxième paramètre d'encre d'impression réglé à la surface périphérique du cylindre porte-plaque (43) est relatif au poisseux de celle-ci, un renforcement du poisseux de l'encre d'impression transportée vers un support d'impression, dû à la vitesse de production (V) croissante de la machine à imprimer, étant compensé par une élévation de la température à régler à la surface périphérique du cylindre porte-plaque (43).
  2. Procédé selon la revendication 1, caractérisé en ce que le premier rouleau (54) transfère l'encre d'impression en vidant des évidements ménagés sur sa surface périphérique et remplis d'encre d'impression.
  3. Procédé selon la revendication 2, caractérisé en ce qu'un relâchement de la vidange des évidements du premier rouleau (54) remplis d'encre d'impression à mesure que la vitesse de production (V) de la machine à imprimer augmente, est compensé par le premier rouleau (54) au moyen de la diminution de la viscosité de l'encre d'impression due à la température réglée à la surface périphérique du premier rouleau (54).
  4. Procédé selon la revendication 1, caractérisé en ce qu'un capteur photoélectrique (56) ou un capteur d'images (56) saisit une image d'au moins une partie du support d'impression (49) imprimé avec l'encre d'impression, et transmet les données corrélées à l'image au dispositif de réglage (37) ou à une unité d'analyse (23).
  5. Procédé selon la revendication 4, caractérisé en ce que le dispositif de réglage (37) ou l'unité d'analyse (23) génère une valeur de réglage de la température à la surface périphérique du premier rouleau (54) et/ou du cylindre porte-plaque (43) sur la base d'une comparaison des données d'une image actuelle saisie pendant la production en cours de la machine à imprimer avec des données d'une image antérieurement générée.
  6. Procédé selon la revendication 5, caractérisé en ce que la valeur de réglage de la température à la surface périphérique du premier rouleau (54) et/ou du cylindre porte-plaque (43) est déduite d'une courbe caractéristique ou d'un tableau.
  7. Procédé selon la revendication 5, caractérisé en ce que les données de l'image antérieurement générée sont déduites d'un étage de préparation d'impression en amont de la machine à imprimer.
  8. Procédé selon la revendication 5, caractérisé en ce que les données de l'image actuelle saisie pendant la production en cours de la machine à imprimer sont corrélées à la densité chromatique (D1) de celle-ci.
  9. Procédé selon la revendication 1, caractérisé en ce qu'aucun agent mouillant n'est appliqué sur le cylindre porte-plaque (43).
  10. Procédé selon la revendication 1, caractérisé en ce que le réglage de température à la surface périphérique du premier rouleau (54) et le réglage de température à la surface périphérique du cylindre porte-plaque (43) sont effectués dans des sections parallèles l'une à l'autre.
  11. Procédé selon la revendication 1, caractérisé en ce que le réglage de température à la surface périphérique du premier rouleau (54) et le réglage de température à la surface périphérique du cylindre porte-plaque (43) sont effectués de manière sélective.
  12. Procédé selon la revendication 1, caractérisé en ce que le réglage der température à la surface périphérique du premier rouleau (54) est effectué indépendamment du réglage de température à la surface périphérique du cylindre porte-plaque (43).
  13. Procédé selon la revendication 1, caractérisé en ce que le réglage de la température à la surface périphérique du premier rouleau (54) et le réglage de la température à la surface périphérique du cylindre porte-plaque (43) sont effectués en accouplement variable l'une par rapport à l'autre.
  14. Procédé selon la revendication 1, caractérisé en ce qu'au moins un des systèmes d'équilibrage de température (57 ; 58) est commandé ou régulé par le dispositif de réglage (37).
  15. Procédé selon la revendication 1, caractérisé en ce qu'une variation du réglage de température à la surface périphérique du premier rouleau (54) et/ou du cylindre porte-plaque (43) allant de pair avec une modification de la valeur de la vitesse de production (V) de la machine à imprimer est initiée avant que la nouvelle valeur de sa vitesse de production (V) soit réglée pour la machine à imprimer.
  16. Procédé selon la revendication 15, caractérisé en ce qu'une exécution du réglage de la nouvelle valeur de vitesse de production (V) est retardée jusqu'à ce que le premier rouleau (54) et/ou le cylindre porte-plaque (43) aient atteint, intégralement ou au moins en grande partie, la température à régler pour la nouvelle valeur de la vitesse de production (V) sur la surface périphérique correspondante.
  17. Procédé selon la revendication 1, caractérisé en ce que la température réglée avec le dispositif de réglage (37) est modifiée dans le cadre de limites définies en raison d'une affectation fonctionnelle prescrite pour une valeur de vitesse de production (V) de la machine à imprimer à la surface périphérique du premier rouleau (54) et/ou du cylindre porte-plaque (43).
  18. Procédé selon la revendication 17, caractérisé en ce que la température réglée est modifiée par un réglage effectué manuellement.
  19. Procédé selon la revendication 1, caractérisé en ce que l'encre d'impression est transférée avec un premier rouleau (54) réalisé comme rouleau anilox (54).
  20. Procédé selon la revendication 1, caractérisé en ce que le premier rouleau (54) transfère l'encre d'impression sur le cylindre porte-plaque (43) au moyen d'au moins un autre rouleau (53).
EP05747180A 2004-05-25 2005-05-18 Procede pour reguler un transfert d'encre Not-in-force EP1748892B1 (fr)

Applications Claiming Priority (3)

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DE102004025604 2004-05-25
DE102004044215A DE102004044215B4 (de) 2004-05-25 2004-09-14 Verfahren zur Einstellung einer Übertragung von Druckfarbe
PCT/EP2005/052287 WO2005115758A1 (fr) 2004-05-25 2005-05-18 Procede et dispositif pour reguler un transfert d'encre, et procede pour se servir de ce dispositif

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EP1748892B1 true EP1748892B1 (fr) 2012-10-10

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WO (1) WO2005115758A1 (fr)

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EP1748892A1 (fr) 2007-02-07
DE102004044215B4 (de) 2008-03-13
RU2006145671A (ru) 2008-06-27
US20080011171A1 (en) 2008-01-17
RU2370371C2 (ru) 2009-10-20
DE102004044215A1 (de) 2005-12-22
WO2005115758A1 (fr) 2005-12-08
US7421948B2 (en) 2008-09-09

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