EP1572457B1 - Pre-register adjustment - Google Patents

Pre-register adjustment Download PDF

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Publication number
EP1572457B1
EP1572457B1 EP20030811760 EP03811760A EP1572457B1 EP 1572457 B1 EP1572457 B1 EP 1572457B1 EP 20030811760 EP20030811760 EP 20030811760 EP 03811760 A EP03811760 A EP 03811760A EP 1572457 B1 EP1572457 B1 EP 1572457B1
Authority
EP
European Patent Office
Prior art keywords
printing
f4
f1
printed images
marking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20030811760
Other languages
German (de)
French (fr)
Other versions
EP1572457A2 (en
Inventor
Manfred Loddenkötter
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 DE2002154836 priority Critical patent/DE10254836A1/en
Priority to DE10254836 priority
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to PCT/EP2003/012865 priority patent/WO2004048093A2/en
Publication of EP1572457A2 publication Critical patent/EP1572457A2/en
Application granted granted Critical
Publication of EP1572457B1 publication Critical patent/EP1572457B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41LAPPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING, OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L13/00Stencilling apparatus for office or other commercial use
    • B41L13/04Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers
    • B41L13/06Stencilling apparatus for office or other commercial use with curved or rotary stencil carriers with a single cylinder carrying the stencil
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41LAPPARATUS OR DEVICES FOR MANIFOLDING, DUPLICATING, OR PRINTING FOR OFFICE OR OTHER COMMERCIAL PURPOSES; ADDRESSING MACHINES OR LIKE SERIES-PRINTING MACHINES
    • B41L13/00Stencilling apparatus for office or other commercial use
    • B41L13/16Driving gear; Control thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00Arrangements for the operation of printing presses
    • B41P2233/10Starting-up the machine
    • B41P2233/13Pre-registering

Abstract

Disclosed is a method for pre-registering a printing machine (1) comprising several printing groups (D1-D4). According to said method, the phase position of the print cylinders (F1-F4) which are involved in the printing process are coordinated in such a way that deviations of the print images of the various print cylinders (F1-F4) are located within the capture range of the measuring system which is used for registering purposes, when the print operation is running, in order to determine the position of the print images or parts thereof. The inventive method is novel in the sense that the web to be printed (4), which is supplied during pre-registering of the printing machine (1), is provided with at least one marking which runs through various printing groups during pre-registering, whereby the moments when the marking runs through measuring points in the printing groups are recorded and said moments in time are set in relation to the angle position of the print images of the respective printing groups (D1-D4) at said moments.

Description

  • The invention relates to a method for Vorregistereinstellung according to the preamble of claim 1.
  • Printing machines - and in particular gravure printing machines - for multicolor printing apply the individual colors in individual printing units. The position of the images of different colors is controlled in the printing process by register controls to each other. For this purpose register marks are generally recorded and their spacing is kept constant.
    Such register methods are inter alia in the still unpublished German application with the application number 102 54 836 discussed.
    Before the printing process begins and this regulation begins, the printed images must be aligned to such an extent that the register marks are within the capture range of the measuring system used for the regulator (pre-register setting). For this purpose, the phase position of the cylinder and / or the web length is adjusted between the printing units. The effective web length between the printing units is generally not an integer multiple of the printing length.
    Pre-registering is usually done when setting up the machine. The print length varies according to the subject and the expected web stretch. The effective web length between the printing units varies through the chosen web path, through different sized impression cylinders and impression rollers, through mechanical compliances and tolerances Process parameters such as the web tension and the drying temperature as well as physical properties of the substrate such as its modulus of elasticity and its geometric dimensions.
  • The Vorregistereinstellung takes place according to the prior art for a print job, which is being prepared for the first time, usually manually. The printed images are printed in random position on the web. When the machine is at a standstill, the position deviation is then determined with a length. These data are entered as correction values in the machine control, which determines and adjusts a phase shift therefrom. When reprinting the printed images are then largely on top of each other. The time required and the amount of waste are disadvantageous in this method.
  • Automated pre-register settings require the input of the path length for the initial setup as a basis for calculating the phase angle of the cylinders. However, especially in the case of flexible substrates, the effective web length varies greatly due to the change in the length of the material, so that the catch area is generally missed and the process finds little use. The tolerance in the orientation of the printing cylinder to Drehwinkelaufnehmer the drive proves to be problematic here.
  • A pre-register setting for a repeat job can be based on stored information about the phase position of the printing cylinders in the original job. However, this procedure also requires the exact repetition of all process and machine parameters (even ambient temperature and air humidity) and thus generally has little success.
    The EP0993947 A1 and the US20010022143 A1 introduce automatic pre-register methods in which a register mark is printed on the substrate. The printing substrate then passes through the inking units of the printing press, wherein in each inking unit is an optical sensor device that detects the mark. In order to be able to detect the mark even with the greatest possible deviation, the sensor device must therefore have at least one track section which is the length of a Druckzylinderumfanges has, can scan. Since the sensor devices which detect registration marks during registration during printing operation are optimized to accurately determine the position of the print marks at high printing speed, they have a very small capture range and a high optical sharpness.
    Therefore, the application of the doctrine requires EP0993947 A1 and the US20010022143 A1 For each inking unit either a very complex sensor system with a large capture range and high sharpness, one sensor system with a large and one with a small capture range or a high expenditure of time (sequential scanning of the web through a variety of shots with a small capture range).
    These measures lead either to high investment costs in the sensor systems or a high amount of time for the Vorregistern.
    Therefore, the object of the present invention is to propose a simple, successful and quickly performed Vorregisterverfahren.
  • This object is solved by the characterizing part of claim 1 and claim 8.
    In a preferred embodiment of the method according to the invention, the phase position of the cylinders should be set automatically relative to one another. For this purpose, the web is marked with a raised mark in front of the first printing unit. The brand runs under any process conditions in the printing operation through the web through all printing units that end in random phase position. The brand is in every printing unit Locally detected and the phase position of the associated pressure cylinder is determined at the same time. A first cylinder forms the desired phase position to the print mark, further cylinders show deviating phase positions upon arrival of the mark hereof. By briefly lifting a impression roller with immediate phase adjustment of the cylinder according to the detected phase deviation and lowering again the printed images are superimposed after the mark pass.
  • However, it is also conceivable to initially store the information obtained by the method according to the invention for the relative angular position of the impression cylinder for the marking and to make the adjustments necessary for the preliminary registration at a later point in time.
  • The brand is preferably an adhesive tape which acts as a web thickness change in the printing nip between the printing cylinder and impression roller and disturbs the web transport and the rotation of the printing cylinder. Such a discontinuity / bead leads in the drive train of the individually driven pressure cylinder to a change in speed and thus to a deviation of the actual position of the desired position of the cylinder (following error). Control circuits in modern drives (current, speed and position control loops) compensate for this deviation by an increase in the motor current, which leads to a higher drive torque. The measured variables following error, position, velocity, acceleration, motor current and torque thus characterize the arrival of the mark in the printing nip by a change in its size. An additional sensor is not required. Indirect measurands can be calculated.
    The higher the impression pressure and the thicker, wider and harder the adhesive tape is, the greater the jumps in the measured quantities. Parameter changes in the drive control loops can cause both large momentary jumps and large following errors.
  • An adhesive tape can in principle also be a splice between two webs.
    A tape passage in the press nip leads to a simplified torque curve in the drive as he in FIG. 1 is shown.
    The first increase in the moment curve is suitable for recognizing the mark entry as well as a first maximum or derived quantities. Time-dependent signal curves are typically covered by transient phenomena.
    The local resolution is determined by the quality of the signal rise and the sampling times of the drive control loops in connection with the web speed.
  • The passage of such a mark (adhesive tape / splice) can also be detected as a web tension change. This is especially visible for solid substrates with a high modulus of elasticity. The following error reduces the web tension in the short term. In the web run web tension measuring rollers are integrated at various positions. This is the case in modern machines before, behind and between the printing units.
  • If the demands on the local accuracy and the web speed can not be satisfactorily fulfilled for an application, then the mark can also be detected with an additional sensor.
  • The mark run can be recognized as follows:
  • The adhesive strip raises the impression roller by a few 1/10 mm.
    A position transducer can detect this change in position (distance sensor, initiator, slave indicator, rotary angle sensor on differential ...). In addition to mechanical, optical and inductive sensors, the possibility of capacitive detection should also be mentioned here. For this purpose, the capacitance change between the grounded pressure cylinder and the semiconducting impression roller (ESA) can be determined. An adapted adhesive mark can also lead to a current or voltage change in the ESA circuit, which is recognized as a mark pass.
    An acceleration sensor can detect the jerky lifting of the impression roller.
  • A pressure gauge, which monitors the impression pressure, can detect the lifting of the impression roller.
  • An adhesive tape on the Bedruckstoffrückseite, which is designed in particular color, is also clearly recognizable with a so-called color sensor. A disadvantage of a sensor outside the printing nip are errors in the assignment of the phases of the printing cylinder z. B. by different impression diameter. This error occurs at the o. G. Do not process and is seen as an advantage.
  • Other brands such as hole perforation in the web are also conceivable for this application. Today's web tear sensors (optical / capacitive) or also reflection sensors can detect this marking.
  • It is particularly advantageous to use a method according to the invention in intaglio printing and, in particular, in gravure printing since large web lengths exist between the individual inking units which make the pre-registering particularly complicated in the flexible material frequently used here.
  • Further embodiments of the invention will become apparent from the description and the claims.
    The individual figures show:
  • Fig. 1
    The moment course in a drive of a pressure or counter-pressure roller in a passage of a raised mark
    Fig. 2
    View of a gravure printing machine
  • In FIG. 1 shows the graph G by way of example the course of the torque M against the time t.
    The torque applied by the drive of at least one of the two drives forming the nip reaches its relatively discrete maximum max at the inlet of the raised marking. If the mark is the Nip leaves, minimal torque is spent - the torque curve reaches its minimum min.
  • Fig. 2 shows a sketched side view of a series gravure printing machine 1, which is provided with a Vorregistereinstellung invention. Shown are four inking units F1 to F4, of which only the impression rollers P1 to P4 and the pressure rollers D1 to D4 are shown. As mentioned, the gravure printing machine is equipped with an embodiment of the Vorregistereinstellung invention. The more precise embodiment of the non-inventive features of the gravure printing machine such as their equipment with only four inking - which is insufficient for modern packaging printing - has only exemplary character.
    During the printing process substrate 4 is unwound from the Abwickelbeziehungsweise supply roll 2 and via guide rollers 3 initially the preference 14, of which 14 the pressure roller 10 a and the feed roller 10 b are shown stylized supplied. The advantage 14 also has the preferred printing unit 5, which is configured here - by way of example - as a flexographic printing unit. Accordingly, the format cylinder 22 and the anilox roller 23 and the doctoring chamber 24 are shown as components of the preferred printing unit.
    However, other printing units, automatic or manual labelers or even punching devices are also suitable for carrying out a method according to the invention. Also, the place where this "pre-marking" of the train is actually arbitrary.
  • The preferred printing unit applies a web marking (not shown) to the printing material web 4.
    The material web 4 is fed via the measuring roller 26, which measures the web tension and various guide rollers 3 to the printing units D1 to D4 and printed. Since the illustrated printing machine 1 is a re-type gravure printing machine in which the invention is particularly well-suited, these printing units D1 to D4 consist of impression rollers P1 to P4 and format cylinders F1 to F4, which are called pressure rollers for the purposes of this application , To determine the position of the marker mounted in the transport direction of the printing substrate 4 in front of the respective inking units F1 to F4 sensors 11. These sensors 11 transmit the arithmetic unit, not shown, the time at which the mark pass the respective measuring points.

    Other preferred embodiments of the invention rely on other sensors at this point. Thus, inter alia, when used relative to the printing substrate 4 raised markings can be detected exactly when these marks pass through the nips in which the printing takes place. For this purpose, the torque curve of the roller drives can be monitored. However, it is also possible to measure the force effect of the marking on the rollers or the change in position triggered by this force effect with suitable sensors.
    A computing unit determines in the manner according to the invention the difference in the angular position of the different cylinders at the time at which the at least one marking passes through the respective printing unit. Subsequently, correction signals are generated which set the relative angular position of the pressure rollers and / or the web path between the different printing units. The latter can be done, for example, by changing the positions of the guide rollers 3 in the machine shown.
    at FIG. 2 It has also been dispensed with the representation of encoders or other position measuring devices, since it is known how, for example, more modern direct-drive machines are equipped with these sensors. For example, in the DE 101 45 957 A1 A number of adjusting mechanisms and drives are shown which play a role in printing presses, in the case of a central-cylinder flexographic printing press. The cited application also shows how the actuators can be connected to control devices. In modern, directly driven machines, the drives are often networked directly with control devices which have computing units. Therefore, the graphical representation of control and processing units and their connection to actuators of the printing machine can be omitted at this point.
    It should also be mentioned that the printed substrate is supplied in a known manner via the guide rollers 3 to the advantage 13, which consists of the pressure roller 6a and the feed roller 6b. After that comes the Substrate on the guide roller 3 for winding 7, in which he 4 wound and stored.
    In the present application, the printing nip or nip refers to the gap between any roller carrying a printed image and an abutment. It is emphasized that even a blanket cylinder which carries no printing form, but only an impression of the same, carries a printed image in the context of the present application. In the in FIG. 2 illustrated embodiment, the pressure gap between the pressure rollers D1-D4 and the respective impression rollers P1-P4 can be found. LIST OF REFERENCE NUMBERS 1 press 2 supply roll 3 guide roll 4 Substrate, web 5 Preferred printing unit 6a pressure roller 6b advancement roller 7 rewind 10a pressure roller 10b advancement roller 11 sensor 13 preference 14 preference 22 format cylinder 23 anilox roller 24 blade chamber 26 measuring roll D1-D4 printing units F1-F4 format cylinder P1-P4 pressers Max maximum min minimum G graph M torque t Time

Claims (8)

  1. Method for pre-registering a printing press (1) having a plurality of printing units (D1-D4),
    - in which method the phase relation of the impression cylinders (F1-F4) which are involved in the printing process is adapted to one another in such a way
    - that the discrepancies of the printed images of the different impression cylinders (F1-F4) from one another lie within the lock-in range of the measuring system
    - which, in the context of registering during running printing operation, is used in each case to determine the position of the printed images or of parts thereof,
    - the web (4) to be printed which is fed to the printing press (1) during pre-registering carries at least one marking
    - which runs through different printing units during pre-registering,
    - the instants, at which the mark runs through measuring points in the printing units, being recorded, and these instants being set in relation to the angular position of the printed images of the respective printing units (D1-D4) at these instants, and
    - in that the drives of the impression cylinders (F1-F4) and/or the web path between the printing units are set on the basis of this comparison in such a way
    - that the discrepancies of the printed images of the different impression cylinders (F1-F4) from one another lie within the lock-in range of the measuring system
    - which, in the context of registering during running printing operation, is used in each case to determine the position of the printed images or of parts thereof,
    characterized in that
    - the instants, at which the printing mark passes the roll nips, are recorded, and
    - the marking, with which the web (4) to be printed is provided, is elevated with respect to the printing material on at least one surface of the web (4).
  2. Method according to the preceding claim, characterized in that the force action which the marking exerts on the impression cylinders (F1-F4) or their opposing bearing as it runs through the roll nip, or the positional change or acceleration of the impression cylinder (F1-F4) and/or the opposing bearing caused by this force action, or other derived mechanical variables are recorded.
  3. Method according to one of the preceding claims, characterized in that the torque change (M) is recorded which a drive applies to a roll which delimits the press nip, when the marking runs through the press nip.
  4. Method according to the preceding claim, characterized in that, in order to record the torque change (M), the torque-forming current of the drive of the impression cylinder (F1-F4), the opposing bearing (P1-P4) or an electric variable related to the current such as the voltage is measured.
  5. Method according to one of the preceding claims, characterized in that the lag error of the drive of the impression cylinder (F1-F4) or the opposing bearing (P1-P4) is monitored and the instant of the marking running through is determined using its profile.
  6. Method according to one of the preceding claims, characterized in that
    - the instants, at which the mark runs through measuring points in the printing units (D1-D4),
    - and/or the angular position of the printed images at this instant - and/or the difference in the angular position of the different printed images at the instant, at which the at least one marking runs through the respective printing unit,
    - are made visible with the aid of a display apparatus, and
    - in that a machine operator sets the drives of the impression cylinders (F1-F4) and/or the web path between the printing units (D1-D4) on the basis of the indicated information.
  7. Method according to one of Claims 1 to 5, characterized in that
    - the instants, at which the mark runs through measuring points in the printing units (D1-D4),
    - and/or the angular position of the printed images at this instant
    - are made visible with the aid of a display apparatus, and
    - in that, from this information, a computing unit calculates the difference in the angular position of the different printed images at the instant, at which the at least one marking runs through the respective printing unit (D1-D4), and sets the drives of the impression cylinders (F1-F4) and/or the web path between the printing units (D1-D4).
  8. Printing press which comprises a pre-register device for automatically setting the phase relation of the impression cylinders which are involved in the printing process,
    - the phase relation of the impression cylinders (F1-F4) which are involved in the printing process being adapted to one another during the setting in such a way
    - that the discrepancies of the printed images of the different impression cylinders (F1-F4) from one another lie within the lock-in range of the measuring system
    - which, in the context of registering during running printing operation, is used in each case to determine the position of the printed images or of parts thereof,
    and the pre-register device having the following features:
    - sensors for determining the position of a marking on the printing-material web at measuring points in the inking units,
    - a computing unit, by way of which the instants, at which the mark runs through the measuring points in the printing units, can be recorded, and these instants can be set in relation to the angular position of the printed images of the respective printing units (D1-D4) at these instants,
    - it being possible to set the drives of the impression cylinders (F1-F4) and/or the web path between the printing units of the printing press on the basis of this comparison in such a way
    - that the discrepancies of the printed images of the different impression cylinders (F1-F4) from one another lie within the lock-in range of the measuring system
    - which, in the context of registering during running printing operation, is used in each case to determine the position of the printed images or of parts thereof,
    characterized in that, by way of the pre-register device, the instants, at which a marking which is elevated with respect to the printing material passes the roll nips, can be taken into consideration during the setting of the drives of the impression cylinders (F1-F4) and/or of the web path between the printing units of the printing press.
EP20030811760 2002-11-22 2003-11-12 Pre-register adjustment Active EP1572457B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE2002154836 DE10254836A1 (en) 2002-11-22 2002-11-22 Method and device for regulating the register of a printing press
DE10254836 2002-11-22
PCT/EP2003/012865 WO2004048093A2 (en) 2002-11-22 2003-11-12 Pre-register adjustment

Publications (2)

Publication Number Publication Date
EP1572457A2 EP1572457A2 (en) 2005-09-14
EP1572457B1 true EP1572457B1 (en) 2011-01-26

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ID=32318655

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030811760 Active EP1572457B1 (en) 2002-11-22 2003-11-12 Pre-register adjustment

Country Status (7)

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US (1) US7555985B2 (en)
EP (1) EP1572457B1 (en)
AT (1) AT496768T (en)
AU (2) AU2003296583A1 (en)
DE (2) DE10254836A1 (en)
ES (1) ES2358104T3 (en)
WO (2) WO2004048093A2 (en)

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DE10254836A1 (en) 2002-11-22 2004-06-17 Windmöller & Hölscher Kg Method and device for regulating the register of a printing press
DE10320205B4 (en) 2003-05-07 2015-12-17 Windmöller & Hölscher Kg Multi-color rotary printing press
DE102004034431A1 (en) 2004-07-15 2006-02-09 Windmöller & Hölscher Kg Register pre-control for speed change
DE102006004307B4 (en) 2006-01-31 2013-08-14 Windmöller & Hölscher Kg Method for measuring and adjusting web tension between inking units of a multicolor machine
DE602006012688D1 (en) 2006-10-23 2010-04-15 Fischer & Krecke Gmbh Method, Monatagevorrichtung and control unit for adjusting a roller in a printing press
DE102006060212B4 (en) * 2006-12-18 2013-07-11 Windmöller & Hölscher Kg Printing machine for printing substrate webs and method for setting and maintaining the register of such a printing press
DE102006060464C5 (en) * 2006-12-19 2013-12-24 Bobst Bielefeld Gmbh Method of adjusting a roll in a rotary printing machine
EP1961569A1 (en) * 2007-02-21 2008-08-27 Bobst Sa Device and method of adjustment for a rotary printing machine
DE102007020736A1 (en) * 2007-05-03 2008-11-06 Manroland Ag Web Press
DE102007053527A1 (en) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Method for adjusting the web tension in a processing machine
DE102008021447A1 (en) * 2008-04-29 2009-11-05 Manroland Ag Method for operating a processing device integrated in a web press
WO2010118769A1 (en) * 2009-04-15 2010-10-21 Abb Research Ltd An apparatus for a robot arm
EP2392459B1 (en) 2010-06-02 2015-09-02 Müller Martini Holding AG Method and device for register control of a printing press
DE102011008359B3 (en) * 2011-01-12 2012-02-02 Lpcon Gmbh Method for register control with freely selectable marks
DE102012013435A1 (en) * 2012-04-04 2013-10-10 Robert Bosch Gmbh Method for pre-registering a processing station
DE102015121281A1 (en) * 2015-12-07 2017-07-13 Manroland Web Systems Gmbh Rotary press

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AU2003296583A1 (en) 2004-06-18
WO2004048093A3 (en) 2004-10-14
AU2003292033A8 (en) 2004-06-18
WO2004048093A2 (en) 2004-06-10
AT496768T (en) 2011-02-15
EP1572457A2 (en) 2005-09-14
WO2004048092A3 (en) 2004-11-04
DE10254836A1 (en) 2004-06-17
WO2004048092A2 (en) 2004-06-10
ES2358104T3 (en) 2011-05-05
US20060150852A1 (en) 2006-07-13
DE50313443D1 (en) 2011-03-10
US7555985B2 (en) 2009-07-07
AU2003292033A1 (en) 2004-06-18
AU2003296583A8 (en) 2004-06-18

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