EP2159057A1 - Installation de lavage pour presses - Google Patents

Installation de lavage pour presses Download PDF

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Publication number
EP2159057A1
EP2159057A1 EP09011218A EP09011218A EP2159057A1 EP 2159057 A1 EP2159057 A1 EP 2159057A1 EP 09011218 A EP09011218 A EP 09011218A EP 09011218 A EP09011218 A EP 09011218A EP 2159057 A1 EP2159057 A1 EP 2159057A1
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EP
European Patent Office
Prior art keywords
rollers
dampening
dampening solution
hardness
printing machine
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Withdrawn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
EP09011218A
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German (de)
English (en)
Inventor
Dietger Hesekamp
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.)
Technotrans SE
Original Assignee
Technotrans SE
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 Technotrans SE filed Critical Technotrans SE
Publication of EP2159057A1 publication Critical patent/EP2159057A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/002—Cleaning arrangements or devices for dampening rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/04—Cleaning arrangements or devices for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/06—Cleaning arrangements or devices for offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/24—Wiping devices using rolls of cleaning cloth

Definitions

  • the present invention relates to methods for avoiding and removing hard deposits on rolls of printing machines, and to devices for carrying out such methods.
  • the printing itself is z.T. referred to as "multi-parameter system”.
  • the print quality is influenced by more than 100 parameters, which are currently approx. influence each other. To name but a few important factors: type and condition of the printing press, the screening process, printing speed, humidity and room temperature, the design and exposure of the printing plates, the nature of the ink rollers and blankets, type and composition of the ink, the printing chemistry used, the paper moisture and Type of paper used, care and cleaning condition of the press etc.
  • the blanket cylinders are automatically cleaned by washing units permanently installed on the press.
  • a first type is the brush washer, which cleans the blanket cylinder via a rotating brush which is applied to the rotating blanket cylinder.
  • Another type is the washing cloth washing machine, in which a wash cloth is employed on the rotating blanket cylinder. The washing cloth is usually provided wound up on a cleaning cloth roll and employed by a pressure body to the blanket cylinder. After use, the soiled cloth is further clocked and wound up on another roll.
  • Both brush washers and washing cloth washers are specially designed for use on blanket cylinders and are currently used exclusively for cleaning blanket cylinders.
  • Spray bars and squeegees are used to clean inking rollers.
  • a solvent-containing cleaning fluid is usually applied to the inking rollers.
  • the cleaning fluid acts on the ink on the inking rollers and dissolves them, so that the liquefied ink can be doctored over a staff employed on an inking roller squeegee.
  • These devices are also designed specifically for use on inking and are used in the prior art exclusively for cleaning the inking rollers.
  • Printing presses use a number of process tools.
  • offset printing machines that are operated in the wet-offset printing process require, in addition to the printing ink, a process water called dampening solution or fountain solution.
  • the fountain solution used is intended to wet the non-printing areas of the printing plate and thus prevent ink acceptance in these areas.
  • dampening agent circuits are provided on the printing presses.
  • processing plants are provided in which, for example. Floating parts are filtered out, the Isopropanolanteil controlled and adjusted and in which the dampening solution is tempered.
  • a common composition of dampening solution is a proportion of more than 80% by volume of water, up to 10% by volume of chemical additives and up to 15% by volume of isopropanol, which is also referred to as isopropyl alcohol (IPA for short).
  • IPA isopropyl alcohol
  • the chemical additives serve u.a. the lowering of the surface tension on a technically favorable area, containment of microorganism formation by means of biocides; Prevention of corrosion on steel components of the press by means of corrosion inhibitors, etc.
  • the isopropanol has, inter alia, a viscosity-increasing and a surface tension-lowering effect.
  • other alcoholic liquids could be used.
  • Isopropanol is more volatile than other dampening solution components, so that can result from uneven evaporation of isopropanol and other fountain solution components, especially at higher temperatures, a change in the mixing ratio in the dampening solution.
  • the dampening solution composition in particular the proportion of isopropanol, must therefore be monitored on the one hand and readjusted accordingly.
  • the use of IPA is considered critical from a health and environmental perspective.
  • dampening solution which are essential for the print quality, concern the water hardness and, irrespective of the water hardness, the pH value of the dampening solution.
  • a desired pH is usually between 4.8 and 5.5.
  • Water hardness is a term system of applied chemistry that has evolved from the needs of using natural water with its dissolved ingredients.
  • Water hardness is the equivalent concentration of the ions of the alkaline earth metals dissolved in the water, but in special contexts it also refers to their anionic partners.
  • the "hardeners” include mainly calcium and magnesium and traces of strontium and barium. The dissolved hardeners can form insoluble compounds, especially lime and so-called lime soaps. This tendency to form insoluble compounds is the reason for the attention that led to the emergence of the concept and theory system around water hardness.
  • the dampening solution has a water hardness of 8 ° dH to 12 ° dH (German hardness).
  • the water hardness, and thus the hardness of the dampening solution depend essentially on the calcium and magnesium content. Since it is difficult to determine the hardness of the dampening solution, inter alia due to the addition of dampening solution additives, the water hardness in the prior art is determined before the addition of additives.
  • the EP 0 378 497 B1 before replacing a dampening solution already used or when supplementing the Dampening solution by fresh dampening solution to provide the fresh dampening solution with a certain degree of hardness and to check the degree of hardness of the fresh dampening solution.
  • the finished dampening solution is fed into the dampening solution circuit of a printing machine with the desired fountain solution hardness, the desired pH value and the appropriate additives.
  • the EP 0 378 497 B1 describes with respect to the dampening solution mainly the pH measurement. How to determine the degree of hardness of the dampening solution, is in the EP 0 378 497 B1 not described.
  • the carbonate hardness can be determined by the hydrochloric acid binding capacity (SBV).
  • SBV hydrochloric acid binding capacity
  • the most well-known method of determining the total hardness is the complexometric titration with an aqueous solution of the disodium salt of ethylenediaminetetraacetic acid (EDTA) of known concentration.
  • EDTA forms soluble, stable chelate complexes with the hardness formers Ca2 + and Mg2 +.
  • 100 ml of the water sample to be analyzed are mixed with 2 ml of 25% ammonia solution, a pH 11 buffer (ammonia ammonium acetate) and the Eriochrome BlackT indicator.
  • the indicator with the buffer is available as so-called "indicator buffer tablets”.
  • the indicator forms a red-colored complex with the Ca2 + and Mg2 +.
  • the eriochrome black T is free and colored green.
  • Blank running of the inking rollers is conventionally understood to mean that certain areas of the inking rollers do not accept printing ink or ink less than desired. Blank running can occur both when operating printing machines with IPA in fountain solution, as well as in IPA-less operation. By adding IPA to the dampening solution, however, the occurrence of blank running can be delayed or at least the frequency of occurrence of blank running can be reduced. The reasons for the occurrence of the blank run are still largely unexplored.
  • blank running of the ink rollers during operation leads to large amounts of rejects and pressure interruptions, blank running can be associated with great economic disadvantages which can not be compensated by the savings in cooling and dampening water costs without IPA.
  • the operators of printing machines therefore tend - despite the associated disadvantages - to use conventional dampening solution with a share of IPA.
  • dampening solution can be used with a level of hardness above the conventional degree of hardness, without the risk of increased hardness deposits due to the increased degree of hardness. As a result, the fountain solution must be replaced less frequently. Despite a higher degree of hardness of the dampening solution, the method can be used to prevent unwanted run-on or to prevent the likelihood of blank running.
  • hardness deposits can be removed according to the described method of rolls of the printing press, which have come into contact with the dampening solution. These may be all rolls from which hardness deposits can be transferred to the inking rollers via a touch contact during operation of the printing press.
  • the method moreover relates, in particular, to removal of hard deposits of inking rollers, in order to prevent the inking rollers from running out of blanks.
  • the calcifications can be scraped off, brushed off, sucked off, wiped off or removed in any other way.
  • the hardness deposition removal step may be preceded by a process step of applying softening agent to the rolls.
  • Suitable softeners are, for example, inorganic and / or organic acids. Such acids can be applied, for example, in the form of liquids containing, for example, fruit acid such as malic acid or citric acid and / or acetic acid and / or hydrochloric acid and / or other acids or combinations of such acids.
  • the softening agent may be a liquid having a pH of 3 or less, in particular has a pH between 1 and 2.
  • the softening agents can be selected depending on which components the softening agent comes into contact with. In this case, for example, then a less aggressive softener, such as the fruit acids, can be used, if it is expected that the softening agent comes into contact with a pressure plate clamped on the plate cylinder, which could be damaged by more aggressive acids.
  • the described softening agents may be applied to the rollers using a fluid applicator provided additionally or together with the hardness deposit removal device.
  • Fluid applicators are already used as part of conventional cleaning devices on the rollers to be cleaned, such as. Blanket washes on the blanket cylinder, dampening solution feeders (e.g., a spraying bar of a sprayer or fountain tank), or water spray bars and / or detergent chill rolls on inking rollers.
  • a separate softener application device is provided on one or more of the rollers for applying the softening agent, with which softening agent can be applied to the rollers.
  • This particularly relates to a provision of a separate softener application device in addition to a conventional spray bar to inking units of a printing press.
  • a conventional fluid application device for example the spray bar of an inking unit cleaning device for applying the softening agent, instead of providing a separate softening agent application device.
  • the softener can be applied together with a conventionally used detergent.
  • the step of applying the softener to a conventional Color removal step may include applying color removing agent and doctoring the color soaked by the color removing agent.
  • the softener can then be applied to one or more of the thus pre-cleaned inking rollers. Subsequently, the hardness deposition removal step may be performed.
  • the dampening solution supply device of a dampening unit can first be removed from the dampening solution supply device, e.g. The dampening solution can be drained from the dampening solution tray. Then the dampening solution circuit can be separated from the dampening unit via appropriate valves such that the softening agent to be applied can not enter the dampening solution circuit. Thus, contamination of the dampening solution can be prevented.
  • steps of avoiding contamination of the dampening solution can also be achieved when the softening agent is applied to other rollers (e.g., the inking unit rollers) via other fluid applicators and transferred to other rollers through to the dampening rollers via rotation of the rollers.
  • the already existing on these devices fluid application devices such.
  • Detergent applicators may be used in dampers, spray bars, or dampening troughs of dampening units, or similar devices used to apply the softening agent, e.g. can be switched.
  • separate softener application devices may be provided in addition to the already existing fluid applicator devices.
  • a step of exposing the softening agent applied to calcifications may be performed.
  • the step of exposure may vary according to the degree of calcification or the strength of the softening agent, e.g. last between a few seconds and several minutes.
  • the hardening deposition removal step may be preceded by a conventional cleaning step.
  • a conventional cleaning step may include applying solvent to the inking rollers. After applying solvent, wait until the paint has dissolved. Then the loosened paint can be doctored off. Thereafter, as described above, optional application of the softening agent, exposure to the applied softening agent, and finally, the hardening deposit removing step may be performed.
  • the regular performance of the hardness deposition removal step can be done automatically with a regularity determined by an algorithm.
  • the other steps described above for eliminating the softening can also be carried out.
  • a control device may be provided which automatically controls the hardness deposition removal step and possibly also the other steps and their order.
  • the hardness deposition removal step may be any conventional one Purification step or take place only after every second, third, fourth or nth conventional cleaning step.
  • further parameters can be detected and incorporated into the determination of the cleaning frequency. Such parameters can be, for example, the duration of the print jobs carried out, the amount of paper used, a measured water hardness, the degree of actual calcification, the elapsed time since the last calcification was carried out, etc.
  • a less aggressive softening agent e.g. the fruit acids are used when it is expected that the softener will come into contact with a pressure plate mounted on the plate cylinder which could be damaged by more aggressive acids.
  • the step of operating the wet offset printing machine can be done using dampening solution which has an alcoholic content of less than 5%, in particular no alcoholic content.
  • alcoholic content is meant in particular the undesired IPA content due to environmental protection and health protection, which is conventionally used in dampening solution.
  • the step of removing hardened deposits of rolls of the printing press on dampening rollers and / or on inking rollers and / or on blanket cylinders can take place.
  • the hardness deposit removal device can be provided on dampening rollers and / or on inking rollers and / or on blanket cylinders.
  • the hardened deposit removal step takes place, in particular, via a hardness deposit removal device arranged directly on an inking unit roller.
  • the dampening solution removal step may be e.g. by rubbing with sucking elements such as wipes, sponges or the like, by stripping with squeegee-like elements, rubber lips or the like, by suction with a suction device or the like, or in a similar manner.
  • the step of dampening solution removal does not mean merely allowing the dampening solution to evaporate, since precisely this procedure would lead to a deposition of lime components contained in the dampening solution.
  • the dampening solution removal device may be provided for the purpose with a dampening solution removal body extending across the width of the roller from which the dampening solution is to be removed.
  • the dampening solution removal body extends only over a part of the width of the roller, from which the dampening solution is to be removed and is moved transversely to the roller in the longitudinal direction thereof during the dampening solution removal step.
  • the dampening solution removal body may be a roller equipped with a suction pad.
  • the roller can be stored rotatably drivable in the dampening solution removal device.
  • the dampening solution removal body is provided in the form of a dry cloth, which is pressed for drying to the roller. In this case, the dampening solution removal device can be designed so that the cloth is further clocked when a drying effect is no longer guaranteed.
  • the dampening solution removing apparatus may be configured so that the dampening solution removal body is reused after a drying phase.
  • the step of operating the wet offset printing machine can be carried out using dampening solution, which has an alcoholic content of less than 5%, in particular has no alcoholic content.
  • dampening solution which has an alcoholic content of less than 5%, in particular has no alcoholic content.
  • the step of removing hardened deposits of rolls of the printing press on dampening rollers and / or on inking rollers and / or on blanket cylinders can take place.
  • the dampening solution removal device can be provided on dampening rollers and / or on inking rollers and / or on blanket cylinders.
  • the dampening solution removal step takes place, in particular, via a dampening solution removal device arranged directly on a dampening roller.
  • a method according to the second aspect may further comprise one of the method steps described in relation to the first aspect. This is especially true for the hardness deposition removal step
  • the method may be configured such that the hardness deposition removal step is performed according to an algorithm as described above, in particular an algorithm in which the hardness deposition removal step is not performed after the end of each print job but only if there is a likelihood that the Calcification of the rollers has reached a degree that requires removal of the calcification.
  • the dampening solution removal step e.g. be performed after the end of each print job to prevent or reduce drying of the dampening solution on the rolls of the printing press, in particular the dampening rollers. This can already prevent the formation of calcifications or at least significantly reduced. As a result, the frequency of performing the hardness deposition removal step can be further reduced.
  • the dampening solution removal step may be performed before and / or after the hardness deposition removal step.
  • This roll cleaning step may be a conventional cleaning operation previously used on printing machines, e.g. using washes, such as washing cloth washes and / or brush washers is performed.
  • washes such as washing cloth washes and / or brush washers is performed.
  • the hardness deposition removal step and / or the dampening solution removal step would be in addition to the conventional cleaning operation.
  • the hardness deposition removal step may be carried out using a washer installed on the printing press, particularly using a blanket washer, a wash cloth washer, and / or a washer with a rotating cleaning body.
  • a cleaning agent application device eg a spray bar
  • a squeegee are usually used to clean inking rollers.
  • blanket cylinders usually washing cloth or brush washers are used.
  • Such washing systems can be converted to carry out the hardness deposition removal step. The conversion can, for example, affect the change in the control of the car wash.
  • the cleaning agent application device of the inking unit or a washing cloth washing system or a brush washing system of a blanket cylinder can be connected to a Enthärtungsschvorrats matterer, so that, for example, switchable both conventional detergent and softener can be applied over the detergent application device to the corresponding rollers.
  • the applied softening agent By rotating the various contacting rollers, the applied softening agent can be transferred to the other rollers. Subsequently, the calcifications can be removed.
  • the hardening deposit removal step can also take place, for example, via the respective washing plant.
  • the limescale dissolved via the softening agent can be wiped off the rolls together with the softening agent by setting the washing cloth to the cylinder. It is also conceivable to retrofit the printing machine with separate devices which can be attached to the printing press in addition to or alternatively for existing washing systems. Such separate devices can perform only single or all process steps that serve to remove the calcifications.
  • a separate softener applicator and / or a separate softener removal apparatus or a combined softener application and softener removal apparatus may be provided.
  • the conventional cleaning operation may be performed first, and subsequently, when the first cleaning operation is completed, the softening agent application step and / or the hardness deposition removal step may be performed. It is also conceivable that such processes overlap in individual steps.
  • lime removal agent may be applied to the rollers. This step can be done separately from the conventional purification step. It is also conceivable that the lime removal agent is already applied during the conventional cleaning step.
  • the dampening solution removal step can take place using one or the washing system installed on the printing machine, in particular using a blanket washing system, a washing-up machine and / or a washing system with a rotating Cleaning body.
  • the control of a washing cloth washing machine arranged on a blanket cylinder can be designed such that e.g. after an already completed cleaning of the blanket cylinder or regardless of such cleaning with the washing cloth and the dampening solution present on the dampening rollers is removed.
  • the dampening solution can be transferred to the plate cylinder and from there to the blanket cylinder via a contact of the rotating dampening roller and removed there from a dry section of the washing cloth of the washing cloth washing system until all rollers are dry.
  • Cartridges with a rotating cleaning body can be used in a similar manner.
  • washing systems can already exist on printing presses, rebuilt and then used for the corresponding additional function. Possibly. the use of existing devices can also be done without modification, e.g. done by a corresponding control of the car wash. It is also conceivable to retrofit the printing machine with separate devices which can be attached to the printing press in addition to or alternatively for existing washing systems. With the aid of such washing systems, e.g. first, the conventional cleaning operation may be performed, and subsequently, when the first cleaning operation is completed, the fountain solution removing step may be performed.
  • a washing cloth plant arranged on a dampening roller or on an inking roller can be used.
  • washcloths are conventional Cleaning operations usually moistened with cleaning fluid. Then the moistened washcloth is brought into contact with a roller to be cleaned, whereby it is cleaned, for example, of paint residues.
  • Washing cloth washers have hitherto been used exclusively on blanket cylinders.
  • Such washing systems can also be used with slight modifications for softening or for dampening solution removal and are arranged for this purpose on a dampening roller or on an inking roller.
  • the washing cloth can be moistened, for example with lime remover. Then, the moistened washcloth can be brought into contact with a roll to be cleaned, so that lime residues can be dissolved and / or wiped off via the limescale removal agent.
  • the washing cloth can be used in a dry, ie in a non-moistened state to dry the rollers, so as to remove, for example, still on the rollers dampening solution.
  • the washcloth may be further transported so that the portion of the washcloth which has been previously moistened with cleaning fluid and / or descaling agent is further transported and replaced by a dry portion of the washcloth.
  • the hardened deposit removal step and / or the cleaning step take place only when necessary, so that the drying step can take place independently of the first hard deposit removal and / or the cleaning steps.
  • a third aspect relates to an arrangement on a printing machine for removing fountain solution from rolls of the printing press, comprising a dampening solution removal device arranged on a dampening roller.
  • a fourth aspect relates to an arrangement on a printing machine for removing hardness deposits of rollers of the printing press comprising a hardness deposit removal device arranged on an inking unit roller.
  • Such an arrangement may further include a dampening solution removing apparatus according to the third aspect.
  • the arrangements according to the third or the fourth aspect may be designed such that with such an arrangement, a method according to the first or the second aspect is feasible.
  • Other conceivable device features will be apparent from the embodiments made with respect to the first and second aspects.
  • a fifth aspect relates to an arrangement according to the third or fourth aspect, comprising a control device, which is connected to the arrangement and designed such that the control device, the hardness deposit removal device and / or the dampening solution removal device are driven such that with the arrangement, a method according to the first or second aspect.
  • the control device may include a microprocessor-controlled computing unit (computer).
  • a sixth aspect relates to a computer program product containing computer-readable control instructions which, when loaded and executed in a control device according to the fifth aspect, cause the control device (40) to cause the hardness deposit removal device (20) and / or the dampening solution removal device (30). controls so that with the arrangement, a method according to the first or second aspect is performed.
  • FIG. 1 shows a schematic view of a wet offset printing machine 10th
  • the printing machine 10 is shown merely by way of example with three printing towers 11.
  • the printing towers 11 may each have one or more printing units 12.
  • FIG. 2 shows a first embodiment of an inventive arrangement on the printing press 10th
  • the illustrated printing unit 12 has a blanket cylinder 13, a plate cylinder 14, which may also be referred to as a printing plate cylinder, and a counter-pressure cylinder 15. Between the blanket cylinder 13 and the impression cylinder 15 runs a printing material 101, e.g. a paper web, through and is printed by the blanket cylinder 13.
  • a printing material 101 e.g. a paper web
  • a dampening roller 161 of a dampening unit 16 is employed to the plate cylinder 14. Furthermore, inking rollers 171 of an inking unit 17 are employed on the plate cylinder 14.
  • the dampening unit 16 has a dampening solution supply device 162 which, in the illustrated embodiment, is designed as a dampening solution trough. Instead of the dampening solution or in addition to a fountain solution can also Spray bars are used, can be sprayed with the dampening solution on one or more rolls of dampening unit 16.
  • a conventional impression cylinder washing system 151 is arranged on the impression cylinder 15.
  • a blanket washing system 131 is arranged, with which the blanket cylinder can be automatically cleaned if necessary by color residues, paper dust, etc.
  • the blanket washer 131 may be a conventional wash cloth washer or a conventional brush washer. Furthermore, the blanket washer 131, as in the FIG. 2 shown and described in more detail below, be modified so that with the blanket wash 131 a process for the removal of hardness deposits and / or a method for removing dampening solution can be performed.
  • An inking unit washing device 172 which has a detergent application device 174, is arranged on the inking unit 17.
  • the detergent application device 174 has a detergent application device 174, which can be designed as a spray bar, as a spray tube or in a similar manner.
  • the inking unit washing device 172 has a squeegee device 173 which can be adjusted to an inking unit roller 171 of the inking unit 17. With the inking unit washing device 172 can be carried out a conventional cleaning of the rollers of the inking unit. In this case, the paint located on the inking rollers 171 is usually removed after the end of a print job before a print interruption or before a conversion of the printing press.
  • a cleaning agent is sprayed onto the rollers or otherwise applied to the rollers.
  • the detergent is transferred to all rollers of the inking unit 17.
  • the cleaning agent may include, for example, solvents.
  • the cleaning agent can dissolve and / or dilute the paint on the rollers.
  • the squeegee of the squeegee device 173 can be employed on one of the rollers of the inking unit 17 so that the loosened paint can be doctored off.
  • a contact contact of the rollers remains, so that the color of all rollers of the inking unit and / or the other rolls of the printing press 10 can be removed via a rotation of the rollers.
  • the printing couple 12 has a hardness deposit removing device 20 and a dampening solution removing device 30.
  • the hardness deposit removing device 20 is constructed in the manner of a conventional washing cloth washing apparatus according to the illustrated embodiment and substantially corresponds in shape to a blanket washer 131, which in FIG. 6 is shown schematically and with reference to FIG. 6 will be described in more detail below. Contrary to the conventional usage, however, the washer is not disposed on a blanket cylinder but on an inking roller 171 and can be used after the above-described conventional cleaning process of the inking rollers to clean the ink fountain rollers 171 of hardness deposits.
  • the dampening solution removal device 30 is formed in the illustrated embodiment as a sponge drying system. It is also conceivable, instead of a sponge drying plant to provide a Waschtuchtrockenstrom, which may also substantially have the design of a blanket wash 131, which in relation to FIG. 6 will be described in more detail.
  • FIG. 6 shows such a blanket washer 131 for use in one of the embodiments.
  • the blanket washer 131 has a spray bar 132, a swab wrap 133, and a dirty cloth wrap 134. On the clean cloth wraps 133, a washing cloth 135 is wound, which is guided past a pressure element and can be brought by the pressure element in contact with a roller of the printing machine 10 if necessary.
  • blanket washer 131 on an applicator which is designed in the illustrated embodiment as a spray bar 132, with a detergent and / or softener can be applied to the wash cloth 135.
  • the blanket washer 131 is connected by a conduit to a softener source 21, which in the illustrated embodiment is designed as a softener container.
  • a softener source 21 which in the illustrated embodiment is designed as a softener container.
  • a detergent container 175, which is associated with the blanket washer 131 and connected to this, is in the FIG. 2 not shown, but can also be provided in this blanket wash 131.
  • a comparable connection is shown and described with respect to the detergent applicator 174 of the inking unit 17.
  • the in FIG. 6 shown blanket wash 131 connected via a data line with a control device 40.
  • the data line can be wired or wireless.
  • the control device 40 can be provided as part of the blanket washing system 131 or centrally for controlling a plurality of elements of the printing unit 12, a plurality of printing units 12 or / or the printing press 10.
  • the control device 40 may be configured to provide a method of Removal of hardness deposits and / or a method of removal of dampening solution and / or conventional cleaning operations by means of the described arrangements controls.
  • the detergent applicator 174 is connected to both a softener source 21 and a detergent container 175 via lines. Depending on requirements, either detergent or softener of the detergent application device 174 are supplied. The inflow of the respective fluid can be controlled via corresponding valves. It is also conceivable that two separate application devices (for example two spray bars) are provided which are each connected to only one of the containers.
  • the softening agent source 21 is in the in FIG. 2 illustrated embodiment, both with the detergent application device 174 and with the dampening solution removal device 30 as well as with the dampening solution supply 162 connected by way of example. It is also conceivable that a connection to the softener source 21 is provided only for one or only two of the application devices. A softener source 21 may be provided separately for each of the applicators or may be centrally connected to a plurality of applicators.
  • the dampening solution supply means 162 are connected to a fountain solution tank 163.
  • the dampening solution tank 163 may be part of a dampening solution processing device, for example.
  • the dampening solution supply device 162 is designed as a dampening solution trough. It is also conceivable that the dampening unit 16 is designed as a spray dampening unit with a spray bar instead of the dampening solution pan. If the dampening solution supply device 162 is designed as a dampening solution trough, it may be useful to remove the dampening solution contained in the dampening solution trough during the descaling process prior to application of softener agent through the dampening solution trough. In the case can Subsequently, softeners are poured into the dampening solution tank and transferred to the dampening rollers. After the end of the cure deposition removal step, the softener can be removed from the fountain solution pan.
  • the dampening solution removal device 30 can be provided exclusively for removing dampening solution from the surface of the dampening roller rolls 161. In that case, no connection of the dampening solution removal device 30 to the softening agent source 21 would be provided.
  • FIG. 3 shows a second embodiment of an inventive arrangement on the printing press, which substantially corresponds to the embodiment in Figure two.
  • the schematic components shown may, as in FIG. 2 is shown, with corresponding containers in conjunction and are supplied via these with the required fluids. The following are therefore only some differences to FIG. 2 explained.
  • the detergent applying device 174 and the squeegee device 173 are provided for cleaning the inking rollers 171. In that case, these two components can completely take over the function of removal of hardness deposits. Furthermore, it is conceivable that this function is completely taken over by the illustrated blanket washing system 131 and / or by the dampening solution removal device 30 shown.
  • the dampening solution removal device 30 is embodied in this embodiment as a wash drying system. In these cases, a connection of the dampening solution supply 162 with a softening agent source 21 would not be required.
  • FIG. 4 shows a third embodiment of an arrangement according to the invention on the printing machine.
  • a printing unit 12 are provided on both sides of the printing substrate 101 to be printed, so that the printing substrate 101 can be printed on both sides.
  • a dampening solution removal device 30 is arranged at each of the dampening units 16.
  • each of the inking units 17 has an inking unit washing device 172, which may further have the functions of a hardness deposit removing apparatus 20.
  • FIG. 5 shows the in FIG. 3 shown second embodiment of an arrangement according to the invention with parked rollers.
  • the rollers in particular the inking rollers, can be parked by the plate cylinder 14 during the removal of hardness deposits.
  • This has the advantage that a softening agent applied to the inking rollers 171 can not be transferred to the printing plate cylinder by the rotation of the rollers.
  • This has the advantage that a sensitive printing plate is not attacked by the softening agent. Stopping the inking rollers 171 of the plate cylinder 14 is therefore particularly useful if the printing plate on the plate cylinder 14 should be used for the next printing or subsequent printing operations. It is also conceivable that the printing plate on the plate cylinder 14, e.g. before a longer printing break, provided with a protective layer which is not attacked by the softening agent.
  • rollers may remain in touching contact with each other during the removal process of hardness deposits, so that the softening agent is additionally transferred to the plate cylinder 14 and / or other rollers of the respective printing unit 12. This has the advantage that also calcifications on the other rolls can be removed in this way.
  • dampening roller 161 are also turned off by the plate cylinder 14 in the context of the removal of dampening solution.
  • effective removal of the dampening rollers 161 of the fountain solution can be ensured, on the other hand can be carried out parallel to this dampening solution removal step, a conventional cleaning of the inking rollers and / or the Härteposition removal step on the other rolls of the printing press 10, in particular the inking rollers 171.
  • FIG. 7 shows a flowchart of one embodiment of a method for dampening solution removal.
  • a method for cleaning a printing machine after completion of a print job can comprise three processes which essentially run parallel to each other.
  • First, conventional ink roller washing as previously described can be accomplished using the inking unit 172.
  • the blanket washing which has also already been described can take place in parallel.
  • As a third step, preferably at substantially the same time, the removal of dampening solution from the dampening rollers 161 can take place.
  • the dampening rollers 161 may be brought out of contact with the plate cylinder 14.
  • a dampening solution removal device 30 in the form of a sponge drying system and / or a washing cloth system 30 is set to one or more of the dampening roller 161.
  • the inking rollers 161 are rotated.
  • the washcloth or sponge is brought into contact with one or more of the dampener rollers 161. If a portion of the washcloth is saturated with moisture, the washcloth may continue to cycle so that another dry area of the washcloth can improve drying.
  • the sponge roller can be rotated by a certain angular range, so that a dry area of the sponge roller can improve the drying.
  • the fountain solution located on the surfaces of the other dampening rollers 161 is also transferred to the dampening roller 161 at which the dampening solution removal device 30 is set so that the dampening solution can be removed from all the dampening rollers 161.
  • the removal of the dampening solution from the dampening rollers 161 a drying of dampening solution on these rollers and thus a deposit of hardness on these rollers is prevented.
  • An arrangement for carrying out the dampening solution removal step may comprise a dampening solution removal device 30, which is arranged to be adjustable on a dampening roller 161.
  • dampening solution removal device 30 can also remove hardening deposits from the dampening roller rolls 161.
  • the dampening solution removal step can also take place without the step of removal of hard deposits.
  • the dampening solution removal step can be performed each time a printing operation is completed so that drying of dampening solution on the dampening roller is minimized.
  • the dampening solution removal step can basically be carried out on different rolls of the printing press. The greatest effect is shown by this step, when it is performed on dampening rollers, since the dampening rollers are coated in the use of the printing press with a fountain solution film and therefore preventing the drying of this dampening solution can lead to a significant reduction of calcifications.
  • FIG. 8 shows a flow diagram of an embodiment of a method for dampening solution removal with subsequent Härteposition removal.
  • dampening solution removal step shown in this flowchart corresponds to that with reference to FIG. 7 described dampening solution removal step and will therefore not be described again.
  • the descaling process can be done after each ink roller wash. In general, it will be sufficient if calcifications of the inking rollers 171 take place only occasionally. A decalcification of the inking rollers 171 at longer intervals is particularly sufficient if the dampening solution removal step takes place after the end of each printing operation and / or in printing pauses, because in this case the deposition of calcifications is minimized.
  • the descaling process can also take place without a dampening solution removal step (previously carried out).
  • a combination of the two methods has obvious advantages.
  • limescale deposits can generally occur on all rolls of the printing press and these lime deposits can be transferred to the inking rollers via the rotation of the rollers in contact of the printing press 10, it can be advantageous to remove these limescale deposits with hardness deposit removal devices 20 arranged on the various rollers to remove substantially simultaneously during a cure deposition removal step.
  • hardness deposit removal devices 20 arranged on the various rollers to remove substantially simultaneously during a cure deposition removal step.
  • special hardness deposit eliminators 20 may be provided on the respective rollers to perform this operation.
  • one or more of the already provided on the printing machine cleaning devices, such as the blanket wash 131 or the inking unit 172 are modified accordingly, so that the removal of hardness deposits on the corresponding rollers can also be made by these devices.
  • softener When using a washing cloth washer, softener can be sprayed on the washing cloth.
  • the washcloth may be applied to the corresponding roller so that the softening agent is transferred to the roller surface.
  • This application of softener may be followed by an exposure step so that the softener can dissolve the calcifications. Subsequently, the dissolved calcifications can be removed by further indexing the wash cloth and / or by employing a doctor blade.
  • the individual method steps can be controlled automatically via a microprocessor-controlled control device 40.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP09011218A 2008-09-02 2009-09-01 Installation de lavage pour presses Withdrawn EP2159057A1 (fr)

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DE200810045421 DE102008045421A1 (de) 2008-09-02 2008-09-02 Waschanlage für Druckmaschinen

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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
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
DE102013112919A1 (de) * 2013-11-22 2015-05-28 Manroland Web Systems Gmbh Verfahren zum Betreiben einer Druckmaschine

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US2363817A (en) 1942-09-14 1944-11-28 Goss Printing Press Co Ltd Printing process and mechanism
EP0058891A1 (fr) 1981-02-20 1982-09-01 Fuji Electric Co. Ltd. Procédé pour le réglage de vitesse d'une machine électrique en condition de courant discontinu ou continu
DE4208079A1 (de) 1992-03-13 1993-09-16 Roland Man Druckmasch Vorrichtung zum waschen eines zylinders einer druckmaschine
EP0778062A2 (fr) 1995-12-07 1997-06-11 Mitsubishi Jukogyo Kabushiki Kaisha Méthode et appareil de récupération de solvant d'un liquide de lavage usé provenant d'une machine d'impression
EP0834398A1 (fr) 1996-10-02 1998-04-08 MAN Roland Druckmaschinen AG Eintraínement pour une presse offset à feuilles
EP0858891A1 (fr) * 1997-02-14 1998-08-19 MAN Roland Druckmaschinen AG Méthode et dispositif de nettoyage d'une partie d'une unité d'impression d'une machine à imprimer offset
WO2001083216A2 (fr) 2000-04-28 2001-11-08 Baldwin Graphic Systems, Inc. Procede et appareil permettant le nettoyage automatique du cylindre porte-blanchet et des rouleaux encreurs d'une presse a imprimer
WO2002047910A2 (fr) 2000-12-14 2002-06-20 Jean Lucien Sarda Procede de desencrage, nettoyage et entretien des presses a imprimer et dispositif pour la mise en oeuvre du procede
DE102005062373A1 (de) 2005-12-24 2007-06-28 Man Roland Druckmaschinen Ag Verfahren zum Steuern einer Verarbeitungsmaschine für Bogenmaterial

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DD274003A1 (de) * 1988-07-11 1989-12-06 Polygraph Leipzig Rakeleinrichtung fuer offsetdruckmaschinen
FR2641733B1 (fr) 1989-01-13 1993-12-24 Zanon Alain Dispositif pour le controle et la regulation de l'eau de mouillage dans un systeme d'impression offset
JP4205971B2 (ja) * 2003-02-24 2009-01-07 東京印刷機材トレーディング株式会社 枚葉オフセット両面印刷機における圧胴ジャケット洗浄装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2363817A (en) 1942-09-14 1944-11-28 Goss Printing Press Co Ltd Printing process and mechanism
EP0058891A1 (fr) 1981-02-20 1982-09-01 Fuji Electric Co. Ltd. Procédé pour le réglage de vitesse d'une machine électrique en condition de courant discontinu ou continu
DE4208079A1 (de) 1992-03-13 1993-09-16 Roland Man Druckmasch Vorrichtung zum waschen eines zylinders einer druckmaschine
EP0778062A2 (fr) 1995-12-07 1997-06-11 Mitsubishi Jukogyo Kabushiki Kaisha Méthode et appareil de récupération de solvant d'un liquide de lavage usé provenant d'une machine d'impression
EP0834398A1 (fr) 1996-10-02 1998-04-08 MAN Roland Druckmaschinen AG Eintraínement pour une presse offset à feuilles
EP0858891A1 (fr) * 1997-02-14 1998-08-19 MAN Roland Druckmaschinen AG Méthode et dispositif de nettoyage d'une partie d'une unité d'impression d'une machine à imprimer offset
WO2001083216A2 (fr) 2000-04-28 2001-11-08 Baldwin Graphic Systems, Inc. Procede et appareil permettant le nettoyage automatique du cylindre porte-blanchet et des rouleaux encreurs d'une presse a imprimer
WO2002047910A2 (fr) 2000-12-14 2002-06-20 Jean Lucien Sarda Procede de desencrage, nettoyage et entretien des presses a imprimer et dispositif pour la mise en oeuvre du procede
DE102005062373A1 (de) 2005-12-24 2007-06-28 Man Roland Druckmaschinen Ag Verfahren zum Steuern einer Verarbeitungsmaschine für Bogenmaterial

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