EP0372588B1 - Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollenrotationsdruckmaschine - Google Patents

Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollenrotationsdruckmaschine Download PDF

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Publication number
EP0372588B1
EP0372588B1 EP89122723A EP89122723A EP0372588B1 EP 0372588 B1 EP0372588 B1 EP 0372588B1 EP 89122723 A EP89122723 A EP 89122723A EP 89122723 A EP89122723 A EP 89122723A EP 0372588 B1 EP0372588 B1 EP 0372588B1
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EP
European Patent Office
Prior art keywords
cleaning
web
gas concentration
metered addition
printing
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.)
Expired - Lifetime
Application number
EP89122723A
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German (de)
English (en)
French (fr)
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EP0372588A2 (de
EP0372588A3 (en
Inventor
Franz Waizmann
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.)
Baldwin Gegenheimer GmbH
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Baldwin Gegenheimer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baldwin Gegenheimer GmbH filed Critical Baldwin Gegenheimer GmbH
Publication of EP0372588A2 publication Critical patent/EP0372588A2/de
Publication of EP0372588A3 publication Critical patent/EP0372588A3/de
Application granted granted Critical
Publication of EP0372588B1 publication Critical patent/EP0372588B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices

Definitions

  • the invention relates to a method for cleaning cylinders of a web-fed rotary printing press and a device for carrying out the method.
  • the press cylinders get dirty in the course of the pre-printing mainly due to the build-up of sticky paint residues and sticky paper dust.
  • the point sharpness that is important in autotypical halftone printing is lost, some print lots no longer print correctly.
  • a cleaning bar is attached to the rubber cylinder of a printing unit for washing rubber blankets with apparatus, which carries a pressing element which can be brought into and out of contact with the moving rubber blanket.
  • the dirt loosened by the applied cleaning liquid is rubbed off by the pressure of the pressure element from a cleaning cloth that is stretched over the cleaning point.
  • the explosion limit depends on the temperature in the dryer and the partial gas pressures in accordance with the composition of the solvent and binder vapors due to the color formulation.
  • the vapors and / or gases from the printing inks and from the cleaning liquid overlap in time and quantity.
  • the blanket washing device according to DE 30 ⁇ 0 ⁇ 5 469 Al allows simultaneous blanket washing of all printing units and blanket washing of the printing units one after the other. When washing one after the other, there is usually a step from the last printing unit (before the dryer) to the first printing unit (after the web drafting unit).
  • the object of the invention is to rule out an explosion hazard with a short cleaning time and high cleaning intensity with a relatively large amount of cleaning fluid.
  • the advantage of the measure according to the invention lies mainly in the individual adaptation of the respective cleaning process to any installed thermal dryer.
  • explosive gas concentrations which arise in the case of driers which show certain operating behavior are passed under in that the cleaning liquid supply is controlled primarily from the side of the dryer.
  • This also means retrofitting of blanket washers in existing web-fed rotary printing presses with differently designed continuous dryers.
  • Another advantage is that idle times are eliminated due to the temporal superimposition of the metering of cleaning liquid. Alignment with the permissible gas concentration value gives the highest possible amount of detergent.
  • the time saved and thus the waste saved is considerable in the process engineering procedure according to the invention with approximately simultaneous loading of the cylinders.
  • careful work with too little detergent with a relatively poor cleaning effect is avoided; on the other hand, no work with dangerously too much detergent can occur.
  • the currently received measured value from the dryer results from the prevailing gas / steam load of the ongoing production operation with the respective web width, web speed, monochrome to multi-color printing, paper quality, dampening solution flow and the prevailing dryer settings on the actuators of the dryer with its supply and discharge flows. Compared to the current measured value, there is a higher permissible gas concentration value at which the dryer can be safely driven.
  • the difference between the allowable gas concentration value and the The current measured value shows the utilization range that the dryer can tolerate for its safe operation.
  • the amount of solvent that can still be infiltrated for this range, the evaporation of which leads to the permissible gas concentration value, is used as the maximum amount to be applied for the cleaning process.
  • the infeed flow rate applies to the dryer inlet and is not identical to the metering flow rate applied to the cylinders during cleaning. Only a part of the metered-in volume flow reaches the dryer as an in-flow volume flow, because the other parts branch off by splitting on the blanket cylinder, suction in the possibly used washcloth, and volatilization.
  • the metering quantity flow relates to the quantity with which a wash bar can be loaded.
  • the metering quantity flow is distributed over the number of printing units.
  • the cylinders of the printing units can be fed with the flowing metering quantity flow individually one after the other or approximately with one another (individual washing or complete washing).
  • the metering quantity flow is fed first to one cylinder of one printing unit, then to the other cylinder of the other printing unit, etc.
  • each of the cylinders to be washed is included in an approximately synchronous manner.
  • the constant exposure to the cylinder surfaces to be cleaned has a favorable effect on the cleaning effect.
  • the cycle and quantity of cleaning liquid for a quick wash of the individual cylinder are relatively rigid in the case of individual washing, there is a greater range of variation in the case of complete washing due to the superimposition of the distributed partial quantities, for example, for one cylinder swelling quantities, for the other cylinder swelling quantities.
  • the volumetric metering element of the cleaning device can additionally be equipped with a fine measurement with feedback of the respective real metering quantity.
  • the metering quantity flow is preferably represented by linear factors or weights dependent on the printing unit.
  • Each washing device of each printing unit thus receives a weight factor for the spray interval length involved, and a further weight factor for the part of the spray involved and, depending on the length of the spray interval, a weighting factor for possible break intervals.
  • Each application to the cylinder creates a more or less long marking on the web, the beginning of which rises and the end of which falls.
  • the loading profile of the feed quantity flow is created.
  • the course speed plays a role in the sequence of the markings and the course of the profile.
  • the marking originating from a fixed dosage curve becomes longer and thinner, at a relatively lower web speed it becomes shorter and higher.
  • the printing unit distance must also be taken into account. This results in the wet / dry spots on the paper web due to the partial quantities and times of their application depending on the web speed and reciprocal run distances.
  • the special features of the job profile are known to the Rachmann from the side of the print settings in multi-color printing.
  • the inflow volume profile offers the Access for the cheapest, desired evaporation flow metering. This consists in that instead of longer sections of dry web between metering events and too wet places with the consequence of gas concentration peaks, a load that is as continuous as possible is generated.
  • the method according to the invention can be followed with a controller.
  • the gas concentration is the controlled variable in one of the rall, after which the cleaning liquid is provided in the form of the permissible gas concentration value in order to achieve the guide value.
  • the gas concentration value is the auxiliary control variable, the pure control process being based on the Measurement and position of the cleaning liquid.
  • the measured quantity of the cleaning liquid comes from a wet surface (e.g. the rubber blanket surface), from the metering elements of the cleaning devices or from the wetness of the web.
  • the operating parameters of the controller are fixed after knowledge of the respective controlled system depending on the dryer operating behavior, production pressure conditions or obtained using an adaptive method.
  • the controller programs the control parameters itself by storing curves from the comparison value pairs of the respective gas concentration value and the respective liquid quantity value, from which the model of the controlled system is formed.
  • a short-term spray application can be assumed as an input function with a corresponding response function of the gas concentration curve, from which the essential values for adjusting the controller can already be taken with a good approximation.
  • the one-time spray application can be carried out at the start of every modified cleaning operation.
  • the lowest possible gas concentration with a relatively high use of detergent as the goal of optimal rubber blanket washing is achieved if a device is arranged in front of the dryer which dries the web, which is moist with detergent and possibly still paint, by suction or wiping off.
  • a reduction in gas concentration is also achieved if a film of diffusion, consisting of water or high-boiling liquids or dispersion, is applied to the web at the entrance to the dryer or beforehand by means of an application unit. It is also used to lower the gas concentration if the dryer setting, flame reduction, increase in the amount of supply air or the like is changed in response to high detergent loads.
  • An FID is suitable for the arrangement of the sensors in the continuous dryer.
  • a sensor works faster according to the IR absorption principle.
  • the control task with controlled tracking of incoming cleaning fluid based on one or more previous measured values in the dryer can be solved in a suitable manner with the IR sensor.
  • the measured value of an adjacent sensor can be extrapolated to the maximum value.
  • measured values from any point can be taken as a basis on the basis of a mathematical relationship, in order to carry out the extrapolation to the permissible cleaning liquid loading of the web from this measured value.
  • the method according to the invention can also be used in multi-web operation with the operation of a plurality of dryers arranged in parallel, through which the webs are guided together to the folder.
  • the measuring device assigned to the respective web dryer is linked to the washing bars of the printing units printing on the web in question. If there is no interface from the machine control system, which contains the web assignment and the ink guide via the ink zone actuators, additional scanners for the web width, print assignment etc. can be arranged specifically for the requirements of the washing facilities.
  • the dryer 3 there is an elevated temperature for evaporating the volatile components.
  • the web 1 is carried in addition to the web tension by forced flow.
  • FIG. 2 shows the supply of the cleaning liquid on the basis of the valves controlled by means of output signals y1 to y4.
  • Lane 1 is used for the drainage of contaminants and Cleaning liquid used, for which purpose the pressure between the two blanket cylinders 6 for perfecting remains set, depending on the cylinder geometry.
  • the unrolling of the wet rubber blankets on the web 1 causes a corresponding wetting of the web 1, at least in sections.
  • cleaning liquid which partly consists of organic, flammable vapor-forming solvents, is introduced into the dryer 3.
  • the measuring device 4 in the form of a gas sensor records the resulting gas concentration.
  • the gas concentration is not uniform because of the flow in the dryer 3, which requires a special arrangement and measurement of the measuring device 4 in relation to the vapor profile (Fig. 7).
  • Several sensors for the measuring device 4 can be arranged at reproducible measuring signals.
  • the measurement signals as input signals x of the control part 7.1 are compared with the reference variable w for specifying the setpoint.
  • output signals y1 to y4 appear on the actuating amplifier 7.3, which act on the valves of the cleaning liquid supply of the cleaning device 6.
  • a processor or computer 7.2 which processes the process information, is manually connected to the control part 7.1 and the actuating amplifier 7.3, with manual input for the control is provided and contains the programming of the relationships between x, w, y1 to y4, as well as other influencing or disturbing variables from the printing process for function formation.
  • the computer 7.2 keeps the data about the print allocation with regard to the printing area portions in the ink zones for the individual printing units. This opens up the possibility of designing the intensity of the cleaning process both after the average load on the printing unit 2.1 to 2.4 in question with ink and after the zone-by-zone loading of the relevant blanket cylinder 5. Different cleaning intensities are processed either by a correspondingly lower or higher number of starting cycles of the cleaning device 6 or by a relative amount of cleaning liquid.
  • the web width can be entered into the computer 7.2 via a scanning head (not shown), manually or by retrieving it via the interface to the press control. The web width is relevant for the infeed flow gelang entering dryer 3 insofar as z. B. in the case of a half-wide web with a constant flow rate ⁇ double zone application compared to a full-width web is possible.
  • cleaning liquid is applied to the blanket cylinder 5, which is smeared and mixed with contaminants and transferred to the printing material web 1 as the application profile 10-1.
  • the cleaning cloth feed and the starting process of the cleaning device 6 more or less wet spots with a periodic change occur.
  • a wave-shaped profile is selected for the order profile 10 ⁇ .1 of the inflow volume flow ⁇ .
  • FIG. 5 shows the cleaning process in the sequence from the printing unit 2.4 closest to the dryer 3 to the printing unit 2.1 adjacent to the drafting unit.
  • Each cleaning cycle leads to a job profile 10.1 on the web 1, which, depending on the timing of the cleaning from printing unit to printing unit 2.1 to 2.4, is more or less separate or can overlap with the adjacent application profile.
  • the associated steam concentration in the dryer runs according to curve 11 (10 ⁇ .1).
  • the curve curve concentration m a over the flow path s of curve 11 (10 ⁇ .1) shows that the cleaning process compared to the production pressure with curve 11 (9) results in an increased steam load, so that the steam concentration m a measured as real approaches the value of the lower one Explosion limit.
  • the curve profile m a / s differs from dryer to dryer and depending on the operating setting; the selected curve profile is therefore an example.
  • a metered-in quantity flow G is specified, which is based on another application profile 10.1 of the introduced quantity flow ⁇ with the success of lowering the steam concentration m a from curve 11 (10 ⁇ .1) to curve 11 (10 ⁇ .2).
  • the subsets are closer to lane 1 and are slightly lower.
  • the closed circuit from the measuring device 4 via the control part 7.1 to the actuators of the cleaning devices 6 has the effect that the decisive dynamic variables are specifically processed during the cleaning process. In this way, metering peaks, which can lead to corresponding explosive gas concentration peaks, are avoided.
  • the printing material web 1 is used in a favorable manner for the removal of dirt and cleaning liquid by generating a uniform and narrow loading profile by means of the control of the metering events. This ensures that the gas concentration curve does not drop unnecessarily in the meantime and waste is uselessly caused by unloaded web sections.
  • the printing units 2.1 to 2.4 can be cleaned one after the other.
  • the cleaning process is carried out at sub-intervals that are overlapped in time.
  • the quasi-simultaneous cleaning of the blanket cylinders 5 presupposes a distribution scheme in which the total metering quantity G to be seen for a cleaning cycle is used for the printing units 2.1 to 2.4 in a manner distributed over time and in terms of quantity.
  • the subsets overlap in time in an alternating sequence, as illustrated by the job profile 10-2 in FIG. 6. A certain hatching is assigned to the subsets for the individual printing units 2.1 to 2.4.
  • the portion added with respect to printing unit 2.4 lies next to the portion added with respect to printing unit 2.3, etc.
  • This metering sequence and distribution can be deviated from at discretion.
  • the metering quantity flow G to be counted for the subsets m i is transferred according to the average integral quantity flow ⁇ .
  • weights or proportion factors are provided, with which the subsets m i are calculated in relation to an arbitrarily set total flow rate M.
  • the subsets m i like the sub-periods of feeding the cleaning liquid, are specific to the printing unit. For the subperiods are proportional factors the arbitrarily specified period Z is set. Additional programming elements can be used to program the control, so that printing interval-specific pause intervals can be provided, with which the non-working of the cleaning devices is taken into account.
  • the output signals y act in the form of control signals y1 to y4 assigned to the actuators of the cleaning devices 6 on the process path from web 1.
  • the behavior is based on the measurement signal x from the measuring device 4 the process line with respect to the gas concentration m a added.
  • the gas concentration m a is functional depending on the type of metering function of cleaning liquid m e .
  • a small or large rectangular pulse of cleaning liquid results in a small or large pulse with an increase and decrease on the side of the gas concentration.
  • step functions in the illustration below show that, depending on the parameter values of the process line, a certain value of the metering quantity m e , G, ⁇ after point 1 is followed by a certain value of the gas concentration m a after point 1 '.
  • the gas concentration shows a marked dead time due to path feed, delay of the evaporation and flow transition.
  • pairs of values consisting of values at the same point in time of the metering quantities m compared to the gas concentration m are stored in the computer 7.2. These pairs of values are used to identify the process section and to subsequently form a model, so that the cleaning liquid is always metered in in accordance with the control device 7.1, 7.2, 7.3 and adapted to the respective process section.
  • the sensor 8.1 for scanning the blanket cylinder 6 and / or the sensor 8.2 for scanning the web 1 measure the wetness of the cleaning liquid transmitted from the metering of the dosing elements of the cleaning device 6, which may still appear mixed with ink wetness (FIG. 2). Due to the combination of the metered quantity G to the wet quantity ⁇ and further gas concentration m a , the effective range can be designed differently, by either measuring the wet fractions with or without the gas concentration measurement and depending on the metering elements. With known evaporation and known dryer operating behavior, the gas measurement can be switched off for simplified control purposes.
  • the measurement signals from the sensors 8.1, 8.2, the control part 7.1 can be used to guide the wet components and thus the inflow flow profile connected control loops. In the event of the limit being exceeded, safety precautions in the form of a web cut-off device (not shown) and controllable locking are provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Cleaning By Liquid Or Steam (AREA)
EP89122723A 1988-12-08 1989-12-08 Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollenrotationsdruckmaschine Expired - Lifetime EP0372588B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3841411 1988-12-08
DE3841411A DE3841411C1 (enrdf_load_stackoverflow) 1988-12-08 1988-12-08

Publications (3)

Publication Number Publication Date
EP0372588A2 EP0372588A2 (de) 1990-06-13
EP0372588A3 EP0372588A3 (en) 1990-11-14
EP0372588B1 true EP0372588B1 (de) 1994-07-13

Family

ID=6368744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122723A Expired - Lifetime EP0372588B1 (de) 1988-12-08 1989-12-08 Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollenrotationsdruckmaschine

Country Status (3)

Country Link
EP (1) EP0372588B1 (enrdf_load_stackoverflow)
AT (1) ATE108371T1 (enrdf_load_stackoverflow)
DE (1) DE3841411C1 (enrdf_load_stackoverflow)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4216243C2 (de) * 1992-05-16 1995-10-12 Kotterer Grafotec Vorrichtung zur Reinigung eines Zylinders
DE4408027A1 (de) * 1994-03-10 1995-09-14 Koenig & Bauer Ag Mehrfarbenrollenrotationsdruckmaschine für Akzidenzdruck
DE4443357C2 (de) * 1994-12-06 1998-05-14 Roland Man Druckmasch Verfahren und Anordnung zur Reinigung eines Zylinders einer Rotationsdruckmaschine
DE19501694A1 (de) * 1995-01-20 1996-07-25 Roland Man Druckmasch Steuerung für die Drucktuch-Wascheinrichtung einer Offset-Rotationsdruckmaschine mit mehreren Druckwerken
DE19541160C1 (de) * 1995-11-04 1997-01-30 Roland Man Druckmasch Verfahren zur Reinigung eines Zylinders einer Rotationsdruckmaschine
DE19541159C2 (de) * 1995-11-04 1999-01-07 Roland Man Druckmasch Waschvorrichtung für eine Druckmaschine
DE102005013653B4 (de) * 2004-04-05 2014-05-22 Heidelberger Druckmaschinen Ag Absaugung für eine drucktechnische Maschine
DE102008047429A1 (de) 2008-09-15 2010-04-15 Baldwin Germany Gmbh Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollenrotations-Druckmaschine
DE102010042033A1 (de) * 2010-10-06 2012-04-12 Windmöller & Hölscher Kg Rotationsdruckmaschine zum Bedrucken eines Bedruckstoffes und Verfahren zum Überwachen von Kennwerten des auf den Bedruckstoff aufgebrachten Druckmittels
DE102011080897A1 (de) * 2011-08-12 2013-02-14 Koenig & Bauer Aktiengesellschaft Verfahren zum Abführen von einem in einem Waschmittel enthaltenen Lösungsmittel und von einem in mindestens einer Druckfarbe enthaltenen Lösungsmittel jeweils aus einer Druckeinheit einer Druckmaschine
DE102011080896A1 (de) * 2011-08-12 2013-02-14 Koenig & Bauer Aktiengesellschaft Verfahren zur Einstellung einer Menge eines Lösungsmittel haltigen Waschmittels
DE102011080903A1 (de) * 2011-08-12 2013-02-14 Koenig & Bauer Aktiengesellschaft Verfahren zum Abführen von einem in einem Waschmittel enthaltenen Lösungsmittel und von einem in mindestens einer Druckfarbe enthaltenen Lösungsmittel jeweils aus einer Druckeinheit einer Druckmaschine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508711A (en) * 1967-12-29 1970-04-28 Ryco Graphic Mfg Fluid dispensing system
GB1254439A (en) * 1968-11-29 1971-11-24 Web Press Eng Inc Blanket cylinder washer
US4344361A (en) * 1979-04-19 1982-08-17 Baldwin-Gegenheimer Corporation Automatic blanket cylinder cleaner
US4677298A (en) * 1983-12-13 1987-06-30 Kollmorgen Technologies Corporation Method of monitoring ink-water balance on a lithographic printing press
DE8707384U1 (de) * 1987-05-22 1987-07-16 Baldwin-Gegenheimer GmbH, 8900 Augsburg Vorrichtung zur Bearbeitung von lösungsmittelhaltigem Material
DE3723400C1 (de) * 1987-07-15 1989-02-23 Baldwin Gegenheimer Gmbh Verfahren und Vorrichtung zum Reinigen von Zylindern einer Rollendruckmaschine
DE3901105C1 (en) * 1987-07-15 1990-01-11 Baldwin-Gegenheimer Gmbh, 8900 Augsburg, De Method and apparatus for cleaning cylinders of a web-fed printing machine

Also Published As

Publication number Publication date
EP0372588A2 (de) 1990-06-13
DE3841411C1 (enrdf_load_stackoverflow) 1990-07-26
ATE108371T1 (de) 1994-07-15
EP0372588A3 (en) 1990-11-14

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