EP2127876A1 - Method and device for configuring a printed picture created by a rotary printer - Google Patents

Method and device for configuring a printed picture created by a rotary printer Download PDF

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Publication number
EP2127876A1
EP2127876A1 EP09006850A EP09006850A EP2127876A1 EP 2127876 A1 EP2127876 A1 EP 2127876A1 EP 09006850 A EP09006850 A EP 09006850A EP 09006850 A EP09006850 A EP 09006850A EP 2127876 A1 EP2127876 A1 EP 2127876A1
Authority
EP
European Patent Office
Prior art keywords
printing
image
camera
adjustment
printing unit
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.)
Withdrawn
Application number
EP09006850A
Other languages
German (de)
French (fr)
Inventor
Michael Wiebe
Harald Brinkmann
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.)
BST International GmbH
Original Assignee
BST International 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
Priority to DE102008025114A priority Critical patent/DE102008025114A1/en
Application filed by BST International GmbH filed Critical BST International GmbH
Publication of EP2127876A1 publication Critical patent/EP2127876A1/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0036Devices for scanning or checking the printed matter for quality control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F13/00Common details of rotary presses or machines
    • B41F13/02Conveying or guiding webs through presses or machines
    • B41F13/025Registering devices

Abstract

The method involves recording a printing image (7) by a camera (6), where the printing image is compared with a stored reference image in a control and comparing unit (16). Printing units (2.1-2.8) are adjusted around a preset movement value. The printing image of a sequence of different printing images recorded by the camera is compared with the reference image. An adjustment interval is determined. The printing units are adjusted corresponding to the determined adjustment interval, and the printing of the image is continued based on the determined adjustment interval. An independent claim is also included for a device for positioning a printing image, comprising an adjusting motor.

Description

  • The invention relates to a method for setting a printed image according to the preamble of claim 1 and to an apparatus for carrying out the method.
  • Out EP 1 249 346 a method is known in which the rollers involved in the color transfer are moved by their own actuators both together and independently against each other to adjust the quality of the printed image. With a camera, the print image is recorded on the substrate web and fed to an electronic control unit that evaluates the image of the print image or the image of parts of the print image and checks the ink transfer in the image of the print image for completeness, the control unit so generated signals for the actuators of the rollers involved in the printing and inking process until the images of the printed image are completely imaged.
  • In this method, the camera, as seen in the web running direction, positioned at a greater distance from the rollers involved in the printing, because the printed image must be dried before it can be picked up by the camera, so that a certain amount of time passes until a printed image of taken on the camera and can be checked for quality, which is done at not sufficient quality an adjustment of the rollers involved in printing and another print image is generated, which in turn is checked for quality by the camera after a certain time. For this setting a certain amount of time is required and there is also a relatively large amount of waste material of the printing material.
  • The invention has the object of providing a method and an apparatus of the type described in such a way that the adjustment of the printed image can be made faster.
  • According to the invention, a printing unit is adjusted stepwise by predetermined values, so that successively different printed images are produced on the printing material web. The camera takes this sequence of consecutive, different print images, whereupon this sequence is compared with a stored target image and from this sequence of print images that is selected which comes closest to the target image. Only then does an adjustment process take place. After the values of the individual setting steps have been stored in the control and comparison unit, the printing unit can be set to the value of that setting step which, after the preceding comparison, has brought a result closest to the target image.
  • While in the known method, the printing unit is always adjusted when the camera has detected an insufficient match with the target image, a sequence or sequence of different printed images is taken by the camera according to the invention, each individual printed image of the sequence compared with the target image is, then only then the adjustment of the printing unit according to the determined optimum setting is made.
  • In this way, the setting of the printed image can be made much faster and there is less waste of printing material, which is required for the adjustment process. It eliminates unnecessary waiting cycles until the adjustment result of a setting step has arrived at the camera. It is only a single adjustment step from already made setting steps or adjustments selected that best corresponds to the optimal print image.
  • The method according to the invention is particularly advantageous when the printing unit with the rollers involved in printing is lifted off the impression cylinder step by step from a predetermined printing position, so that a printing mark applied to the printing material web becomes weaker or incomplete with each step of lifting the printing unit from the impression cylinder until the print mark finally disappears. These successive printed images of the differently reproduced print mark are recorded by the camera, wherein from the sequence or from the sequence of differently reproduced print mark that step is selected in which just no more pressure takes place. Thereafter, the printing unit is set or pressed by a predetermined empirical value on the impression cylinder, which results in a good printed image, so that the printing can be continued with a good quality of the printed image without any further adjustment.
  • Advantageously, the print marks used for the adjustment can be used simultaneously for register setting, wherein the recorded by the camera print marks are checked not only in terms of their complete or incomplete playback, but also in terms of their position relative to a desired value. In this case, the control and comparison unit, in which the register position is checked on the basis of the print marks, applies corresponding control signals to further servo motors of the printing press in order to set the register.
  • In this way, in addition to the setting of the printing unit in terms of optimal print image and the registry setting is made in a short time, so that the overall result is an accelerated device of the printing press.
  • Another advantage is inventively achieved in that a predetermined distance of print marks from a reference mark on the printing substrate in the control and comparison unit is stored and compared with the recorded by the camera distance. If a difference between the recorded distance of the print marks and the predetermined distance is determined in this comparison, an aberration in the camera optics or an incorrect zoom setting can be determined in this way. From this, a correction value can be determined which can be used in further adjustment processes or in the evaluation of the printed image.
  • The invention will be explained in more detail for example with reference to the drawing. Show it
  • Fig. 1
    schematically an impression cylinder with arranged on its circumference color printing units and the arrangement of a camera,
    Fig. 2
    the setting of a single color printing unit relative to the impression cylinder,
    Fig. 3
    a field of print marks on a substrate, and
    Fig. 4
    schematically the reproduction of a print mark in an incorrect register setting.
  • Fig. 1 schematically shows an impression cylinder 1, on the circumference of which color printing units 2 are arranged, which can be adjusted by a respective servo motor 3 relative to the impression cylinder 1. In the illustrated embodiment, eight color printing units 2.1 to 2.8 are reproduced for eight colors. A printing material web 4 is guided in the direction of the arrow around the circumference of the impression cylinder 1. It passes through a device 5 for drying the printed image. In the direction of the printing material 4 behind this device 5 for drying a camera 6 is positioned close to the printing material 4, by means of a in Fig. 3 reproduced mark field 7 is recorded by print marks 8 to 15, as shown in Fig. 1 indicated at 7 on the substrate web 4 under the camera 6.
  • This in Fig. 3 reproduced Markenfeld 7 is an example of an embodiment of a hereinafter referred to as a print image brand field, which is assigned to a applied to the substrate web 4, not shown print image. The inventive method can also be carried out in conjunction with only a single printing unit, by means of which, for example, only a single point is printed as a brand field.
  • Fig. 2 shows the impression cylinder 1 with a single printing unit 2, the rollers 21 and 22 involved in the pressure comprises, and z. B. one of in Fig. 1 schematically reproduced printing units 2.1 to 2.8 corresponds. In the Fig. 2a reproduced position of the rollers 21 and 22, which ensures the color transfer to the printing material 4, either as a function machine side exists or must be specified as empirical value. During the adjustment process, the roller 22 referred to as an anilox roller is moved back by the roller 21 designated as a pressure roller until no more ink transfer occurs, wherein Fig. 2b a more raised screen roller 22 shows. From the position of the anilox roller 22, in which no ink transfer to the platen roller 21 is taking place, the anilox roller 22 is rotated by an unillustrated control unit by an empirical value of, for example, 10. B. 100 microns to the pressure roller 21 again hired, so that a color transfer takes place.
  • Thereafter, the pressure roller 21, together with the anilox roller 22 by signals from the control unit by the actuator 3 from the impression cylinder 1 gradually retraced until no more print image is transferred to the printing substrate 4. It is from the camera 6 z. B. an in Fig. 2a Monitored in Volltondruck on the substrate sheet 4 applied print mark of about 2 mm in diameter, which can decrease at the transition from printing to non-printing at the edges or loses color density or depending on the step size abruptly disappears, as a result of which it becomes recognizable for the control unit connected to the camera that no color transfer to the printing material web 4 takes place in the relevant adjusting step. When this state is reached in which is no longer printed, the roller pair 21, 22 is stopped in its return movement of the control unit and then hired by a second empirical value, for example, 70 microns to the impression cylinder 1, whereupon the printing process starts again.
  • In this setting, which differs from the prior art of the aforementioned EP 1 249 346 differs, is only monitored by the camera 6, whether there is still a print or a color transfer or not, while the quality of the printed image itself is not monitored by the camera. It is assumed that only by the empirical value of the travel by which the pair of rollers 21, 22, starting from a position of just no more printing on the impression cylinder 1, a good print image is generated.
  • Regardless of whether a presetting of the printing press is carried out in the known manner or according to the previously described method, according to the invention a sequence of printed images is produced by stepwise adjusting operations, whereupon this sequence of different, successive printed images is taken by the camera 6 and evaluated becomes. It is provided an adjusting device, not shown, in which the values of the adjusting steps are stored adjustable, so that automatically by the adjusting the adjusting steps are carried out, depending on the setting of the adjusting z. B. 10, 20 or 50 microns may be.
  • In this stepwise adjustment process, the pair of rollers 21, 22 forming a printing unit 2 from the predetermined position of a full printing of the printed image ( Fig. 2a ) moved back by a first step, for example, 20 microns from the impression cylinder 1, whereupon after generating a corresponding print image in a second step, the printing unit 2 again to z. B. 20 microns back from the impression cylinder 1. Overall, for example, six such successive adjustment steps of 20 microns are made, for example, in the fourth step, the printed image of a print mark, z. B. 8 in Fig. 3 just disappears. After the first adjustment of z. B. 20 .mu.m, an originally printed in full black print mark 8, for example, dark gray or incomplete, whereupon in the second adjustment of 20 microns a printed image the print mark 8 is generated in light gray or incomplete until that position is reached in the currently no longer printed and the print mark disappears on the substrate web 4.
  • From the camera 6, this sequence of successive, different print images of the print mark is recorded, whereupon in a control and comparison device 16, these individual print images of the print mark are compared with a desired value of the print image and that fourth step is selected as the one, the correct position for the final production of the printing unit 2 in Fig. 2 reproduces. Then, a control signal from the control unit 16 via a machine control 17 to the servo motor 3 of the printing unit 2, so that this makes the fourth step (here 4 x 20 microns = 80 microns) corresponding adjustment of the printing unit.
  • In the same way, the quality of a printed image can be checked by successive, different print images by different settings of the printing units 2 in Fig. 1 and generates the sequence of printed images corresponding to the brand field 7 in FIG Fig. 3 taken by the camera 6 and compared in the downstream control and comparison unit 16 with a predetermined Solldruckbild, where from the sequence of printed images that setting step is selected, which has led to the target image closest to the next result, after which the setting of the printing unit. 2 ( Fig. 2 ) or the printing units 2 ( Fig. 1 ) according to this step and printing is continued.
  • In Fig. 1 is denoted by 18 a rotary encoder, which is coupled to one of the printing units and outputs signals to the control unit 16 via the positioning of the applied by the printing units mark field. This rotary encoder 18 is used for synchronization with the camera 6, each of which makes a recording of an incoming brand field 7 and receives the necessary triggering signals via the control unit 16 by the rotary encoder.
  • In order to clarify the distance of the individual printed images or brand fields 7 in a sequence, between the individual adjustment steps of z. B. each 20 microns to be serviced until the impression cylinder 1 has performed two or three revolutions before a further adjustment is made by 20 microns.
  • In the case of several printing units 2, as in Fig. 1 are reproduced in 2.1 to 2.8, the printing units can be adjusted together in the manner described stepwise, each printing unit 2.1 to 2.8 one of the print marks 8 to 15 in Fig. 3 assigned. But it is also possible to adjust a single or individual printing units from the group of eight printing units 2.1 to 2.8 stepwise with a different step size, if this should be appropriate by the circumstances of a printing press.
  • In one embodiment, for a print image corresponding to the tag field 7 in FIG Fig. 3 all eight printing units 2.1 to 2.8 adjusted in the same setting steps by the associated servo motors 3, so that after each setting step, a changed brand field 7 is obtained. The setpoint best corresponding brand field 7 z. B. the fourth adjustment step is then selected for printing.
  • But it is also possible that within the brand field 7 z. B. printed by the printing unit 2.2 brand 9 in the third setting step has the optimum value in relation to the setpoint of this mark 9, while all other brands 8 and 10 to 15 come closest to the setpoint in the fourth setting step.
  • According to the invention, such an individual comparison of the individual marks 8 to 15 of a mark field 7 is made with the individual desired values and then, if z. B. a single mark 9 in another setting step, the setpoint comes closest to the other brands, the associated printing unit 2.2 adjusted to the third setting step, while the printing units of other brands 8 and 10 to 15 are adjusted to the fourth setting step, because this come closest to the setpoint in the fourth setting step.
  • Thus, a setting for individual inks can be made within a brand field 7, which differs from the setting of the other brands of the brand field 7.
  • Fig. 3 shows the brand field 7 with the print marks 8 to 15, these print marks, for example, have a diameter of 2 mm, starting from a reference mark 8 a predetermined distance of z. B. 12 mm from each other. This brand field 7 is associated with a printed image, not shown on the printing substrate 4 and can be a dimension of z. B. 20 x 100 mm.
  • The brand field 7 includes reference marks 8, 8.1, 8.2 and 8.3, wherein the reference marks 8 and 8.2 are each formed of two adjacent print marks. The reference marks 8.1 and 8.3 consist of a single point. These reference marks 8 to 8.3 come from a single printing unit 2, wherein each of the eight printing units 2.1 to 2.8 can be specified as a reference printing unit. The reference marks 8 to 8.3 are fixed by a corresponding etching in the printing cylinder 21 of the reference printing unit, such as the printing unit 2.4, so that the pressure marks applied by the other printing units 9 to 15 can be assessed in position relative to the reference marks 8 to 8.3. The reference print marks 8 to 8.3 are printed in full black by the reference printing unit. Each of the other printing units is assigned one of the print marks 9 to 15, in the reproduced example, the printing unit 24, the reference printing marks 8 to 8.3 prints and the other seven printing units, the print marks 9 to 15. In the control and comparison unit 16 is the camera 6 recorded position of the print marks 9 to 15 relative to the fixed predetermined reference marks 8 to 8.3 detected and evaluated. During the evaluation, the reference print marks 8 to 8.3 are given as fixed values at which the remaining print marks 9 to 15 must align. The reference printing unit is therefore not adjusted in a register setting as the other printing units, but remains fixed.
  • The brand field 7 is recorded in total with a picture taken by the camera 6. The predetermined distance of the individual print marks 9 to 15 of each z. B. 12 mm from each other and from the reference marks 8 to 8.3 is stored according to the invention in the control and comparison unit 16. If it is recognizable during the recordings by the camera 6 that in the recorded print image of the print marks 9 to 15 they have a different distance from the reference marks from the reference marks 8 to 8.3, then a register setting must be made.
  • Fig. 4 shows as an example the printing of a print mark 9a, which is offset from the target position of the print mark 9 in relation to the reference print mark 8, so that an error of the register setting of the printing press can be seen. Thereafter, in a conventional manner, an adjustment of the register with respect to axial position and phase angle between Reference printing and another printing unit to be made. Again, regardless of the setting of the rollers involved in the printing in terms of print quality, a stepwise adjustment of the register can be made. Usually, a presetting or a presetting of the register, whereupon the register with respect to longitudinal and side register in the manner described can be made stepwise or in a conventional manner in a single adjustment.
  • Furthermore, the two adjacent print marks 8 can be used to correct an error in the optics of the camera or in the zoom setting of the camera. The two print marks 8 have transversely to the direction of a predetermined distance of, for example, 10 mm. If instead of the printed distance of 10 mm as a setpoint a distance of z. B. 11 mm between the two marks 8 is taken by the camera, this results in an error of 10% of the optics of the camera 6, which can be calculated as a correction value for the further control and comparison operations.
  • Instead of the error correction on the basis of the double mark 8, such an error correction can also be made on the basis of the distance of the double mark 8 from the print mark 8.1, that is, in the longitudinal direction of the mark field in FIG Fig. 3 instead of in the transverse direction.
  • The method described is advantageous for all rotary printing machines, in particular also for flexographic printing machines.
  • At 19 is in Fig. 1 a reader for a code 19a on the substrate web 4. This code 19a does not form part of the Fig. 3 reproduced brand field 7.

Claims (6)

  1. Method for setting a printed image (7) generated by a rotary printing press on a printing substrate web (4) by a printing unit (2),
    wherein the printing unit (2) is adjusted and the print image (7) produced after the adjustment is taken by a camera (6) and compared in a control and comparison unit (16) with a stored target image for agreement,
    characterized in that
    - the printing unit (2) is adjusted stepwise by predetermined adjustment values,
    - The camera receives the different printed images (7) thus generated,
    in the control and comparison unit (16) the printed images (7) of the individual adjustment steps are stored,
    - Each printed image of the recorded by the camera sequence of different printed images compared with the target image and
    it is determined at which adjustment step the image closest to the target image (7) was generated,
    - Whereupon the printing unit (2) adjusted according to the so determined adjustment step and the pressure is continued with this adjustment value.
  2. Method according to claim 1, wherein the printing unit (2) is moved stepwise away from an impression cylinder (1) and in each case a weaker or incomplete reproduced printed image (7) is produced,
    whereupon that adjustment step is selected in which just no more pressure has occurred, and
    from the setting position corresponding to this adjusting step of the printing unit (2) a job on the impression cylinder (1) is made to an empirical value.
  3. Method according to claim 1, wherein the print image (7) has a plurality of print marks (8 to 15), which are each produced by one of a plurality of printing units (2.1 to 2.8), wherein the printing units (2.1 to 2.8) are adjusted together stepwise for generating a sequence of printed images (7) and are adjusted together or individually according to the adjustment step in which the printed image came closest to the target image.
  4. Method according to Claim 1, wherein the register (6) is simultaneously determined by the camera (6) and a register adjustment is made if the ascertained register alignment does not correspond to the desired value.
  5. Method according to one of claims 1 to 4, wherein at a predetermined distance transversely to the direction of two marks (8) in the printed image (7) are provided, whose predetermined distance value in the control and comparison means (16) is stored and with the distance of the camera (6) recorded marks (8), is compared, whereupon a difference of the predetermined distance and the recorded distance, an error of the optics of the camera is recognized and taken into account as a correction value in the setting operations.
  6. Device for adjusting a printed image produced by a rotary printing press on a printing substrate web (4) by a printing unit (2)
    - a servomotor (3) for the printing unit (2)
    - A camera (6) for recording the generated print image (7), and
    a control and comparison unit (16) in which the target image of the print image (7) is stored and in which the target image is compared with the image captured by the camera (6),
    - wherein the control unit (16) emits signals to the servomotor (3) in order to carry out an adjustment of the printing unit (2),
    characterized in that
    an adjusting device is provided by which the printing unit (2) is adjusted stepwise by predetermined values,
    - The camera (6) is connected so that it receives the sequence of images generated by the stepwise adjustment, and
    - The control and comparison unit (16) compares each print image (7) of the sequence of captured by the camera (6) printed images (7) with the target image, and
    - Issues a control signal to the servo motor (3) of the printing unit (2), which corresponds to the adjustment step in which the recorded print image (7) came closest to the target image.
EP09006850A 2008-05-26 2009-05-20 Method and device for configuring a printed picture created by a rotary printer Withdrawn EP2127876A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102008025114A DE102008025114A1 (en) 2008-05-26 2008-05-26 Method and device for adjusting a printed image generated by a rotary printing machine

Publications (1)

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EP2127876A1 true EP2127876A1 (en) 2009-12-02

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EP09006850A Withdrawn EP2127876A1 (en) 2008-05-26 2009-05-20 Method and device for configuring a printed picture created by a rotary printer

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711186A3 (en) * 2012-09-19 2014-05-21 BST International GmbH Method and device for adjusting printing units relative to a printing cylinder

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012216749A1 (en) * 2012-09-19 2014-03-20 Bst International Gmbh Printing machine e.g. flexograpihc printing machine has camera that captures print image on printing web of printing units, and monitor that reproduces captured print image stored in memory
DE102014101433B4 (en) * 2014-02-05 2016-03-24 CONPRINTA GmbH & Co. KG Printing unit for a flexographic printing machine and method for its operation

Citations (6)

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Publication number Priority date Publication date Assignee Title
DE4413735A1 (en) * 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Control of regulation of dot size produced by rotary printing press
EP1249346A1 (en) 2001-03-27 2002-10-16 Windmöller & Hölscher KG Device for adjusting the printing image in a flexographic printing machine
EP1384580A1 (en) * 2002-07-27 2004-01-28 serv-o-tec Druck- und Papierverarbeitungsmaschinen GmbH Method and device for setting registers of a printing press
WO2007086052A2 (en) * 2006-01-25 2007-08-02 Advanced Vision Technology (Avt) Ltd. System and method for setting up a printing press
EP1839854A1 (en) * 2006-03-31 2007-10-03 ELTROMAT GmbH Method and device for the optimal position adjustment in a rotary flexographic printing machine comprising several printing groups
EP1961569A1 (en) * 2007-02-21 2008-08-27 Bobst Sa Device and method of adjustment for a rotary printing machine

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Publication number Priority date Publication date Assignee Title
ES2264390B1 (en) * 2005-06-10 2008-03-01 Comexi, S.A. Method for automatically adjusting print pressure in flexographic printing machines.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413735A1 (en) * 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Control of regulation of dot size produced by rotary printing press
EP1249346A1 (en) 2001-03-27 2002-10-16 Windmöller & Hölscher KG Device for adjusting the printing image in a flexographic printing machine
EP1384580A1 (en) * 2002-07-27 2004-01-28 serv-o-tec Druck- und Papierverarbeitungsmaschinen GmbH Method and device for setting registers of a printing press
WO2007086052A2 (en) * 2006-01-25 2007-08-02 Advanced Vision Technology (Avt) Ltd. System and method for setting up a printing press
EP1839854A1 (en) * 2006-03-31 2007-10-03 ELTROMAT GmbH Method and device for the optimal position adjustment in a rotary flexographic printing machine comprising several printing groups
EP1961569A1 (en) * 2007-02-21 2008-08-27 Bobst Sa Device and method of adjustment for a rotary printing machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711186A3 (en) * 2012-09-19 2014-05-21 BST International GmbH Method and device for adjusting printing units relative to a printing cylinder

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