EP1972442B1 - Procédé et dispositif de nettoyage de buses sur un dispositif d'humidification à pulvérisation - Google Patents

Procédé et dispositif de nettoyage de buses sur un dispositif d'humidification à pulvérisation Download PDF

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Publication number
EP1972442B1
EP1972442B1 EP08005366A EP08005366A EP1972442B1 EP 1972442 B1 EP1972442 B1 EP 1972442B1 EP 08005366 A EP08005366 A EP 08005366A EP 08005366 A EP08005366 A EP 08005366A EP 1972442 B1 EP1972442 B1 EP 1972442B1
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EP
European Patent Office
Prior art keywords
spray
nozzle
fluid
protective cap
jet
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 - Fee Related
Application number
EP08005366A
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German (de)
English (en)
Other versions
EP1972442A1 (fr
Inventor
Ernst Gaugenrieder
Guido Pinnekamp
Michael Baldy
Robert Holtwick
Dietger Hesekamp
Hary Kosciesza
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Technotrans SE
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Technotrans SE
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Publication date
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Publication of EP1972442A1 publication Critical patent/EP1972442A1/fr
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Publication of EP1972442B1 publication Critical patent/EP1972442B1/fr
Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices
    • B41F7/30—Damping devices using spraying elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • B05B15/531—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles using backflow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • 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
    • B41P2235/26—Spraying devices

Definitions

  • the invention relates to a printing machine with a spray dampening unit with a spray nozzle cleaning device, a spray dampening unit with a spray nozzle cleaning device and a spray nozzle strip with a spray nozzle cleaning device, wherein the spray nozzle cleaning device was produced in each case by using a fluid line system with fluid nozzles, the use of a fluid line system with fluid nozzles for producing such a spray nozzle cleaning device and a method for cleaning spray nozzles of a spray dampening unit by means of such a spray nozzle cleaning device.
  • dampening units are used in offset printing machines.
  • the task of the dampening unit is to apply a dampening solution evenly to the printing plate of the offset printing presses.
  • the fountain solution e.g. via a water box, nozzles or similarly applied to a first roller.
  • a water film is applied as uniformly as possible by the roller over various other rollers on the printing plate of the printing press.
  • This technology has the disadvantage that in the area of the fountain solution nozzles an additional air connection is necessary. Furthermore, the generation of the air cushion can adversely affect the formation of dampening solution distribution. In addition, compressed air is a relatively expensive medium.
  • the invention is based on the object, a printing press with a Sprühfeuchtwerk to provide such a spray dampening unit, a spray nozzle strip for such a spray dampening unit and a method for cleaning spray nozzles of a spray dampening, through which a trouble-free printing operation and a low cleaning of such a spray dampening is guaranteed.
  • Spray nozzles in this sense are the spray nozzles which spray dampening solution in a spray dampening unit on corresponding rollers of a dampening unit, over which the dampening solution is transported to the printing plate.
  • a printing press can be provided which has a dampening unit, in which the dampening solution is applied via spray nozzles, wherein in the area of the spray dampening unit a spray nozzle cleaning device is provided, through which the spray nozzles can be cleaned, if the spray nozzle mouth is blocked by foreign bodies or , to prevent this.
  • a cleaning fluid can be transported to the fluid nozzles and be directed over them to the spray nozzles, so that they are cleaned by the cleaning fluid.
  • a spray nozzle cleaning device can be triggered manually or automatically when needed or at the end of certain production cycles. It is no longer necessary to manually clean the spray nozzles, to interrupt the production cycle for cleaning or to provide elaborate protection mechanisms for the spray nozzles.
  • An advantageous embodiment relates to such a use, wherein on the fluid line system for each spray nozzle of the spray dampening unit a fluid nozzle is provided, which is designed and arranged on the fluid line, that through them a fluid jet can be generated, which is directed to the spray nozzle ,
  • a fluid nozzle is provided on the fluid line system for each spray nozzle of the spray dampening unit, dampening solution under pressure can be sprayed onto the nozzle mouth of the spray nozzles for a short time at the end of production by a targeted fluid jet.
  • paint mist residue and other impurities adhering to the nozzle mouth can be removed.
  • the fluid line system comprises adjusting means, which are designed such that the ejection direction of the fluid nozzles is adjustable via the adjusting means.
  • a corresponding printing machine with a spray dampening unit with a spray nozzle cleaning device has a fluid line system with fluid nozzles, wherein the fluid line system comprises adjusting means by which the ejection direction of the fluid nozzles is adjustable. This has the advantage that such a fluid line system is easy to assemble and adjust or readjust.
  • such a use preferably has a design in which the fluid line system has a connection device, via which the fluid line system can be connected to a fluid source.
  • a corresponding Printing machine with a spray dampening unit with a spray nozzle cleaning device has a fluid line system with fluid nozzles and a connection device, via which the fluid line system can be connected to a fluid source.
  • the fluid line system can be connected via the connection device to a fluid supply of the printing press, preferably a dampening medium line of the spray nozzles.
  • a fluid supply of the printing press preferably a dampening medium line of the spray nozzles.
  • dampening solution as a cleaning fluid also has the advantage that even existing disposal circuits or devices can be used.
  • the cleaning medium can be discharged via a drain present in a spray chamber and can either be disposed of or processed by suitable filtration methods and returned to the process. This has the advantage that neither the consumption of dampening solution nor the amount of dirty water is appreciably increased by the temporary use of the spray nozzle cleaning device.
  • a further advantageous embodiment relates to such a use, wherein the fluid line system comprises a fluid valve, via which the fluid output is controllable.
  • the control of the fluid output may e.g. with regard to the timing of the fluid ejection, its duration and / or the pressure with which the fluid is ejected.
  • the fluid line system has a fluid valve per fluid nozzle, via which the fluid output of the respective Fluid nozzle is controllable.
  • the control can be done, for example, in terms of timing, duration and / or pressure.
  • a nozzle line can be provided, which leads from the central fluid line to the respective fluid nozzle, wherein the fluid valve is provided for this fluid nozzle in the nozzle line.
  • This design has the advantage that even individual spray nozzles can be cleaned separately. This reduces the consumption of cleaning fluid.
  • this embodiment has the advantage that disturbances in the printing operation can be minimized if only specifically the nozzles are cleaned, the cleaning of which is required during operation.
  • such a use has a design in which the fluid line system has a control unit, via which the one or more fluid valves are controllable.
  • a further advantageous embodiment relates to a use in which the fluid conduit system can be connected to a plurality of fluid sources with different fluids.
  • the cleaning process can be optimized. For example, First, a pre-cleaning can be done with a detergent, which soils are dissolved. Subsequently, rinsing with dampening solution and finally the spray nozzles can be dried with air. It is conceivable that the detergent is supplied to the dampening solution in the first step or that ready-processed detergent is used.
  • the various fluids can be supplied via different feeds to a single line of the fluid line system sequentially or simultaneously. It is also conceivable to provide different separate piping systems for different fluids in the spray nozzle cleaning device.
  • a plurality of fluid nozzles are provided per spray nozzle, which are preferably acted upon independently of one another with different fluids.
  • Several fluid nozzles per Spray nozzle can improve the cleaning effect.
  • the use of different fluids has the advantages mentioned above.
  • a further advantageous embodiment relates to such a use, in which the fluid output of the different fluids is separately controllable.
  • the fluid line system is designed to be mounted on a nozzle bar of the spray dampening unit and / or in the spray room of the spray dampening unit.
  • Nozzle strips in spray dampening units are often designed to be interchangeable. That is, such nozzle strips can be installed or removed as a separate unit of a dampening unit in the dampening unit.
  • dampeners can be retrofitted with such nozzle strips.
  • the provision of a spray nozzle cleaning device on such a nozzle bar has the advantage that a spray nozzle cleaning device can be preassembled on such a nozzle bar and then simply installed together with the nozzle bar in the dampening unit.
  • a spray nozzle cleaning device is not arranged and mounted on the nozzle bar, but in the spray room in front of the nozzle bar on another component of the dampening unit or the printing press.
  • the openings of the fluid nozzles have a distance from the nozzle mouth of the spray nozzles of between 1 cm and 4 cm, preferably between 1.5 cm and 3 cm, particularly preferably about 2 cm.
  • the fluid nozzles are arranged so that the fluid jet generated by them in relation to the spray level of the spray jet produced by the spray nozzles at an angle of between 30 ° and 60 °, preferably of about 45 °.
  • such a use preferably has a configuration in which the pressure of the fluid (s) in the fluid conduit system is achieved via the connection of the fluid conduit system to the fluid source (s) and / or one or more pumps are provided to generate the pressure.
  • Providing the pressure via the connection to the fluid source has the advantage that no additional pump is required.
  • a pump has the advantage that the pressure can be adjusted individually to a specific use of the cleaning device.
  • dampening solution in the fluid line system with a pressure of between 2 bar and 20 bar, more preferably between 3 bar and 15 bar and most preferably about 6 bar can be acted upon.
  • a nozzle bar with a spray nozzle cleaning device mounted thereon which has been manufactured using such a described fluid conduit system.
  • a nozzle bar can be provided as a separate assembly together with a spray nozzle cleaning device and easily mounted in a dampening unit. In this way, printing presses or dampening units can be retrofitted.
  • such a nozzle bar further comprises at least one protective cap, which surrounds at least one spray nozzle and has a spray jet passage, which is designed such that a spray jet generated by the spray nozzle can be sprayed through the spray jet passage, wherein at least one fluid nozzle, that of the at least one spray nozzle is assigned, is arranged inside the protective cap.
  • the protective cap may have a wall which is designed such that an interior space is created within the wall, which surrounds the spray nozzle.
  • the wall can surround the spray nozzle in a pot-like manner, wherein the edge is such that the interior of the protective cap is sealed to the nozzle bar in the edge region.
  • the spray jet passage opening can be arranged in the pot bottom of such a cup-like protective cap.
  • the protective cap can be designed so that only a single spray nozzle is received in the interior of the protective cap. Furthermore, the protective cap can be configured such that two, several or all spray nozzles of the spray bar are received in the interior of the protective cap. In this case, a spray jet passage opening can be provided for each spray nozzle.
  • the protective cap can be designed in such a way that the wall, apart from the spray jet passage opening, does not have any openings which surround the water jet Connect the interior of the protective cap to the spray chamber. Such a protective cap seals off the spray nozzle from the spray room.
  • the spray room is basically the space between the spray nozzles and the body to be moistened by the spray dampening unit.
  • the term spray chamber refers only to the space which lies outside the protective cap to the body to be moistened.
  • the spray jet port may have an aperture adapted to a cross-section of a jet of spray generated by the spray nozzle.
  • Such a cross section may have an elongated shape.
  • a fluid nozzle provided inside the protective cap may, for example, be provided in the middle region of such an elongate spray jet passage opening between the two longitudinal ends of the spray jet passage opening.
  • a fluid nozzle is provided in the region of a longitudinal end of such an elongate spray jet passage opening.
  • a plurality of fluid nozzles are provided within the protective cap and are arranged, for example, at both longitudinal ends of the elongated spray jet passage opening and / or in the middle region between both longitudinal ends of the elongate spray jet passage opening.
  • Such a nozzle bar may further be designed such that the spray nozzle and the associated spray jet passage opening are configured and arranged relative to one another such that they form a jet pump, wherein an inner space of the protective cap is in fluid communication with a non-pressurized clean air reservoir.
  • This design has the advantage that air is conveyed from the clean air reservoir through the protective cap to the outside in the spray room. This prevents polluted air from entering the interior of the protective cap in the opposite direction from the spray room and can accumulate dirt on the spray nozzle there.
  • a jet pump in the sense of the invention is an arrangement in which the pumping action is produced by a jet of fluid, which may conventionally be referred to as a "propellant", the propellant, by momentum exchange, being another medium, commonly referred to as a “suction medium” can, can suck in and promote.
  • the propellant at the Jet pump according to the invention is the dampening solution, which is sprayed through the spray nozzles.
  • the suction medium in the jet pump according to the invention is the clean air, which can be conveyed from the unpressurized clean air reservoir through the Sprühstrahl tolassö réelle in the spray room.
  • pressureless clean air reservoir refers to an air volume that contains air that is not contaminated like the air in the spray room.
  • a clean air reservoir can be connected, for example via a filter opening with the ambient air.
  • a filter of the filter opening be dimensioned so that the ambient air can flow without significant flow resistance in the clean air reservoir, so that in the clean air reservoir substantially the ambient pressure prevails and ensures that the sucked air is not contaminated with contaminants.
  • the air volume can be provided, for example, in the nozzle bar or as a separate volume which is connected to the interior of the nozzle bar and the interior of the nozzle bar with the interior of the protective cap. It is also conceivable that alternatively or additionally, the interior of the protective cap is connected via a line with a separate volume.
  • pressureless means that there is no need to provide a separate pressure source, such as a compressor, which pressurizes the clean air reservoir to a pressure higher than the pressure in the spray space to expel air from the clean air reservoir through the protective cap to the outside to promote the spray room. This has the advantage that such a pressure source can be saved. This makes a device according to the invention cheaper and less prone to failure.
  • Such a spray dampening unit can furthermore have at least one protective cap which surrounds at least one spray nozzle and has a spray jet passage opening which is designed such that a spray jet generated by the spray nozzle can be sprayed through the spray jet outlet opening, at least one fluid nozzle being associated with the at least one spray nozzle is located inside the protective cap.
  • the spray nozzle and the associated spray jet passage opening can be designed and arranged relative to one another such that they form a jet pump, wherein an interior of the protective cap can be in fluid communication with a non-pressurized clean air reservoir.
  • a printing machine which may be embodied with a spray dampening unit described above and has a spray nozzle cleaning device mounted thereon, which has been manufactured using such a described fluid conduit system.
  • a jet pump is provided, as has already been described above with respect to the nozzle bar. Further possible method steps or the possible embodiment of the mentioned method steps therefore result from the statements made there.
  • the term bulkheading in the sense used is to be understood in this context and means shielding which causes no openings to be provided on the protective cap which would allow polluted air to pass through it to the spray nozzle.
  • a clean air flow can be generated in the spray jet passage opening which prevents polluted air from passing from the spray space through the spray jet passage opening to the spray nozzle.
  • the opening geometry of the spray jet passage opening can be selected so that the spray jet generated engages closely to the spray jet passage opening.
  • Distances between the edge regions of the spray jet passage opening and the spray jet, which lie between 0 mm and 3 mm, have proved to be advantageous in the narrowest region of the spray jet passage opening. Particularly advantageous are distances which are greater than 0 mm and / or less than 0.7 mm. It is also conceivable that a mouth region of the spray jet passage opening extends over a certain length in spray direction, for example over a length between 0 mm and 15 mm,
  • ⁇ Maschinensqueites can be made variable.
  • a venturi-like design in the spray jet passage, e.g. First, a Confusor Geb be provided with an initially larger opening cross-section, which narrows to a nozzle area with the narrowest area mentioned above and finally merges into an expanding diffuser area.
  • the nozzle area can also be referred to as a throat area.
  • a design without Konfusor Siemens and / or without diffuser area are also be referred to as a throat area.
  • the protective cap can be designed such that a spray nozzle mouth of the spray nozzle is arranged in the installed state of the protective cap at a distance in front of the spray jet passage, so that a mixing region is provided in which the spray jet moves unaffected by a nozzle-like design of the spray jet outlet opening, before e.g. enters the Konfusor Scheme or equal to the throat area of the spray jet port.
  • a spray nozzle mouth of the spray nozzle is arranged in the installed state of the protective cap at a distance in front of the spray jet passage, so that a mixing region is provided in which the spray jet moves unaffected by a nozzle-like design of the spray jet outlet opening, before e.g. enters the Konfusor Scheme or equal to the throat area of the spray jet port.
  • establishing a flow connection with the clean air reservoir via the provision of a housing opening in an adjacent to the interior of the protective cap housing part of the spray can be carried out, wherein the housing opening connects the interior of the protective cap with a housing interior of the spray unit.
  • the establishment of a flow connection via the provision of a clean air line can be carried out, which establishes the flow connection of the interior of the protective cap with the clean air reservoir outside the housing interior, wherein the clean air line preferably connects the interiors of a plurality of protective caps.
  • a clean air duct may e.g. be provided by a hose or a tube which connects the interior of a protective cap with the clean air reservoir and / or with other protective caps.
  • a combination of jet pump action and fluid jet cleaning is particularly effective and prevents disruption of the operation particularly safe, because on the one hand pollution of the spray nozzles can be prevented with low design complexity with high reliability. Should it nevertheless come to a contamination, this can be eliminated by the fluid jet cleaning with simple design means without much effort.
  • the described methods can be modified according to the possibilities given by a spray nozzle cleaning device described above.
  • a spray nozzle cleaning device described above.
  • such a process may involve the parallel or subsequent use of different cleaning fluids.
  • pauses in the cleaning process can be provided during which the contaminants can be dissolved or dissolved by an applied cleaning medium.
  • the process may include drying steps.
  • monitoring steps of the printing process are provided by which a blockage of the spray nozzles or a spray nozzle can be determined, wherein a cleaning process can be triggered automatically and / or signals can be output to a machine operator who can manually trigger or monitor a cleaning operation.
  • One aspect of the invention relates to a protective cap for use in connection with a spray nozzle of a spray dampening unit in printing presses, wherein the protective cap can be arranged around a spray nozzle and has a spray jet passage opening which is designed such that a spray jet generated by the spray nozzle is sprayed through the spray jet outlet opening can, wherein the spray jet port has such a geometry in relation to a spray jet geometry of a spray jet generated by the spray nozzle that by providing the cap at the spray nozzle, a jet pump is provided by the spray nozzle during operation of the spray dampening in the spray jet passage due to the spray jet of the spray nozzle Air flow can be generated, which flows from the interior of the protective cap in a spray chamber outside the cap.
  • the spray jet passage opening may have a nozzle region which, in the spraying direction of the spray jet, has over a certain distance a substantially constant opening cross-section which runs closely along the spray jet.
  • the walls in the nozzle area may be spaced from the spray jet by between 0 mm and 3 mm. Particularly advantageous are distances which are greater than 0 mm and / or less than 0.7 mm. Also conceivable is a convex surface profile of the nozzle region, so that the narrowest region in spraying direction can extend only over a short distance in spray jet direction.
  • distances between the edge regions of the spray jet passage opening and the spray jet which lie between 0 mm and 3 mm, have proven to be advantageous in the narrowest region of the spray jet passage opening. Particularly advantageous are distances greater than 0 mm and less than 0.7 mm.
  • Such a protective cap may further include a spray jet port which has a diffuser region adjoining the nozzle region in the spray direction, the profile of the opening cross section in the diffuser region preferably expanding in a funnel shape starting from the opening cross section in the nozzle region.
  • the protective cap described in this way can furthermore have a spray jet passage opening, which has a confuser area arranged in front of the nozzle area in the spraying direction, the course of the opening cross section in the confuser area preferably narrowing in a funnel shape up to the opening cross section in the nozzle area.
  • a described opening region of the spray jet passage opening can extend over a certain length in the spray direction, e.g. over a length between 0 mm and 15 mm, in particular over a length which is greater than 0 mm and / or 5 mm.
  • the ⁇ Stammsqueites can be designed variable as described. In question, for example, a venturi-like design with confuser area, nozzle area and diffuser area. Also conceivable is a design without Konfusor Siemens and / or without diffuser area. In this case, the lengths given refer to the extension in spray jet direction without confuser region or without diffuser region.
  • Such a protective cap can be designed so that a spray nozzle mouth of the spray nozzle is arranged in the mounted state of the protective cap at a distance in front of the spray jet passage opening, so that a mixing region is provided.
  • a mixing area which may also be referred to as a mixing chamber
  • the spray jet may move unaffected by a nozzle-like configuration of the spray jet passage opening before it is e.g. enters the Konfusor Scheme or equal to the throat area of the spray jet port.
  • a pulse can be transmitted to the surrounding clean air, which improves a pumping action of the protective cap on the spray nozzle.
  • One aspect of the invention relates to a cap-spray nozzle combination comprising a spray nozzle of a spray dampening unit of a printing machine and a protective cap described above.
  • a ninth aspect of the invention relates to a spray dampening unit of a printing press having a cap-spray nozzle combination as described above.
  • Such a spray dampening unit may further comprise a clean air reservoir and a flow connection, which connects the interior of the protective cap with the clean air reservoir.
  • the flow connection in the form of a clean air line, which connects the interior of the cap with the clean air reservoir, and / or be provided in the form of a housing opening, wherein the housing opening is provided in a adjacent to the interior of the protective cap housing part of the spray unit and connects the interior of the protective cap with a housing interior of the spray unit.
  • such a spray dampening unit may comprise a spray nozzle cleaning device arranged on the spray dampening unit, which has been produced using a fluid line system described at the beginning in relation to the first aspect of the invention.
  • FIG. 1 shows a section of a nozzle bar 22 of a spray dampening unit 2 of a printing press with a spray nozzle cleaning device 3 in an isometric view.
  • the printing machine is preferably an offset printing press, in which the printing plate is moistened via a spray dampening unit 2.
  • FIG. 2 shows a side view of the nozzle bar 22 FIG. 1 in partial section.
  • rollers are moistened via spray nozzles 23 with a fountain solution.
  • Such spray nozzles 23 are preferably flat jet nozzles, which form a dampening solution spray jet 25 and spray onto the roll to be moistened.
  • the spray jet 25 is formed substantially in a plane and expands, starting in the plane of the spray nozzle mouth 24, in a radiation angle, as in FIG. 1 shown.
  • the flat jet nozzles are preferably arranged on a nozzle bar 22, which is also referred to as a spray bar, arranged such that the surface of a rotating roller of the dampening unit 2 can be uniformly moistened.
  • Printing machines or dampening units 2 can be retrofitted with such nozzle strips 22, and such nozzle strips 22 can be on or removed depending on the design as complete assemblies in dampening units 2.
  • the individual spray nozzles 23 can also be arranged exchangeably on the nozzle bar 22.
  • the roller to be moistened in the dampening unit 2 is preferably moistened from the flat jet nozzles via a rapid succession of individual sprays. Due to the flow conditions in the area of a spray jet 25, pressure fluctuations in the area of the nozzle mouth 24 may occur. Due to the pressure fluctuations, color particles of a paint mist or paper dust, which is located in the ambient air around the nozzle orifice 24, can settle thereon.
  • the spray nozzle cleaning device 3 is in the area of the spray nozzles 23 provided to clean the spray nozzles 23 preferably immediately after the end of a production cycle '. Once a spray nozzle 23 clogs during a production cycle, the spray nozzle cleaning device 3 may also be used during the production cycle.
  • the spray nozzle cleaning device 3 has a fluid line system 31, which in the illustrated preferred embodiment comprises a thin tube, which is arranged just below the flat jet nozzles slightly below the flat jet nozzles.
  • a fluid conduit system 31 above or laterally of the spray nozzles 23 is also conceivable.
  • the attachment device of the tube is not shown in the drawing.
  • the tube is mounted on the spray bar 22 so that it can be installed and removed together with the spray bar 22. It is also conceivable that the tube is mounted on other components of the spray dampening unit 2, separated from the spray bar 22.
  • a fluid jet 33 can be sprayed by the fluid nozzles 34, which are formed by the small holes, targeted to the spray nozzle mouth 24, so that it is freed from residues.
  • the fluid nozzles may be their own components connected to a portion of the tube, e.g. are bolted to this. It can be provided in the fluid conduit system adjusting means for individual fluid nozzles 34, which are designed such that the fluid jet 33 can be targeted to the respective nozzle mouth 24.
  • the cleaning medium is thereby subjected to a pressure of about 6 bar.
  • a pressure of approx. 2 to 3 bar is sufficient; for more severe soiling, pressures of up to approx. 20 bar or even more can be used.
  • one or more fluid nozzles 34 can be provided in the fluid conduit system 31 per spray nozzle orifice 24.
  • the fluid output may be concentrated on the spray nozzle orifice 24 from one or more fluid nozzles 34.
  • the distance between the fluid nozzle 34 and spray nozzle mouth 24 is about 2 cm.
  • a smaller distance is also conceivable, e.g. when the fluid nozzle 34 is executed as an integral part of a spray nozzle.
  • a greater distance is also conceivable, in particular if the fluid conduit system 31 is operated at greater pressures, so that the fluid jet 33 still has a good cleaning action even over a greater distance.
  • the fluid jet 33 preferably has an angle of approximately 45 ° to a plane which is spanned by the spray jet 25.
  • a straight circular cylindrical tube extends in front of the spray nozzles 23 along a straight line.
  • a hole is provided in the tube per spray nozzle 23 in the preferred embodiment.
  • the holes can be mounted so that when attaching the tube in front of the spray bar 22 each fluid jet 33 from one of the holes targeted to the bore associated with the spray nozzle 24 hits. It is also conceivable, however, to provide nozzles which can be mounted on the fluid conduit system 31 instead of simple boreholes, which may additionally have adjustment means, so that individual or all fluid nozzles 34 can be directed to the respective spray nozzle orifice 24 in a targeted manner.
  • the fluid line system 31 of the spray nozzle cleaning device 3 can be connected to a fluid supply 25 of the spray dampening unit 2, for example with the fountain solution supply of the spray nozzles 23.
  • the spray nozzle cleaning device 3 can be operated with dampening solution.
  • the fluid line system 31 of the spray nozzle cleaning device preferably has a connection device which can be releasably connected to the fluid supply of the spray nozzles 23 of the dampening unit 2, for example via a quick release.
  • the spray nozzle cleaning device 3 can be pressurized with the pressure provided via the fluid supply.
  • the fluid line system 31 of the spray nozzle cleaning device 3 is connected to other fluid systems of the dampening unit 2 or the printing press or with its own fluid source.
  • the fluid system of the blanket washing system is an option.
  • the spray nozzle cleaning device 3 can be operated with blanket detergent.
  • fluid valves are preferably provided, by means of which the spray nozzle cleaning device 3 can be set in operation independently of the spray nozzles 23.
  • one fluid valve per spray bar 22, per dampening unit 2 and / or per printing tower can be sufficient.
  • fluid valve for several or each fluid nozzle 34.
  • the fluid nozzles can be selectively used individually, e.g. if only individual spray nozzles 23 are dirty.
  • This design is particularly advantageous when the fluid nozzle 34 is designed as part of a spray nozzle 23.
  • a fluid valve may be provided in the spray nozzle 23.
  • Such a design has the advantage that on the nozzle bar 22 or in front of the nozzle bar 22 no external fluid conduit system 31 must be passed.
  • a cleaning process can be triggered by an electronic control device and / or manually by an operator.
  • a spray nozzle cleaning device 3 with a plurality of fluid line systems 31, which are operated with different cleaning fluids.
  • the use of compressed air, for example, for the pre-cleaning of loose particles and / or for drying after a cleaning step with dampening solution is also suitable.
  • dampening solution can be added in a first cleaning step with a cleaning agent and used in subsequent purification steps neat.
  • Single or multiple fluid conduit systems 31 may be provided with a heater so that the cleaning medium may be heated to enhance the cleaning effect.
  • FIG. 3 shows an embodiment with a nozzle bar 22 according to the invention, the various spray nozzles 23, of which a spray nozzle is hidden under a protective cap 4 is arranged.
  • a protective cap 4 This is for illustration purposes.
  • all spray nozzles 23 will generally be provided with a protective cap 4.
  • a connection to a fluid conduit system 31 is shown, which is not specified.
  • FIG. 3 The area where in FIG. 3 the protective cap 4 is shown is surrounded by a dashed line. This area will be in FIG. 4 shown in an enlarged view.
  • FIG. 4 shows therefore the cap provided with a spray nozzle 23 of the nozzle bar 22.
  • a spray jet passage opening 42 is shown, which has an elongated shape.
  • the oblong shape of the spray jet port 42 is adapted to the spray of a conventional spray nozzle 23, which may be fan-shaped in flat jet nozzles.
  • a fluid nozzle 34 is arranged, which can produce a fluid jet, which can clean the spray nozzle mouth 24 if necessary.
  • FIGS. 5 to 7 Further preferred embodiments of protective caps 4 are shown. In the illustrated embodiments, no fluid nozzles are provided. Also in these illustrated embodiments, the provision of a fluid jet cleaning is also conceivable.
  • the illustrated protective caps 4 are designed such that in conjunction with the spray nozzles 23 they form jet pumps which convey clean air from a clean air reservoir through the spray jet outlet opening 42 so that contaminated air from the spray chamber can not enter the interior of the protective cap 41 in the reverse direction.
  • a protective cap designed in this way is provided with the function of a jet pump which is at the same time provided with one or more fluid nozzles 34.
  • Such a combination can ensure that contaminants can be removed automatically, e.g. can attach to the spray nozzles when the dampening unit is currently not in operation and so the function of the jet pump is not given.
  • FIG. 5 shows an embodiment of a protective cap on a nozzle bar in an isometric view. It can be clearly seen that the spray jet passage opening 42 has a diffuser area in which the opening expands in the spraying direction toward the spray space.
  • FIG. 6 shows a cross-sectional view of a spray nozzle FIG. 5 , which is arranged on a nozzle bar.
  • the interior 41 of the protective cap 4 is connected to a clean air line 52.
  • This clean air line 52 connects the interior 41 of the protective cap 4 with a Clean air reservoir, which is not shown in detail in this figure.
  • the spray nozzle mouth 24 of the spray nozzle is arranged close to the spray jet passage opening 42, which also widens in the direction of the spray chamber 21 in this embodiment.
  • FIG. 7 shows a cross-sectional view of another embodiment of the invention with a protective cap 4 on a nozzle bar.
  • This embodiment corresponds essentially to the embodiment of FIG. 6 ,
  • the illustrated cross-sectional plane is substantially perpendicular to the cross-sectional plane FIG. 6 ,
  • the spray jet port 42 is narrower in this embodiment.
  • the spray jet passage opening 42 initially has a narrower area in the spray jet direction with wall regions which in the illustrated cross section run essentially parallel to the spray jet direction and which only have a small distance to a spray jet produced. This area is called a nozzle area.
  • a distance of these wall areas to the spray jet can be between 0 mm and 3 mm. Particularly advantageous are distances which are greater than 0 mm and / or less than 0.7 mm.
  • the spray jet port 42 widens in a funnel shape. This area is called a diffuser area.
  • the illustrated embodiment has a mixing region, which is not formed as a region of the spray jet passage opening 42, but is arranged in the interior 41 of the protective cap 4. This is evident from the fact that the spray nozzle orifice 24 is at a certain distance from the wall region, in which the spray jet port 42 is formed. It is also conceivable that the spray jet passage opening 42 also has a mixing area, which may have a larger cross section than the nozzle area.
  • the at least a portion of the clean air reservoir 5 is provided in this embodiment in the form of the housing interior 53 of the spray dampening unit or the nozzle bar.
  • the interior 41 of the protective cap 4 is connected to the clean air reservoir 5 via a housing opening 51 in a housing part of the nozzle bar.
  • a clean air line 52 is additionally provided, which can connect the illustrated protective cap 4, for example, with one or more adjacent protective cap (s) and / or a separately provided clean air reservoir.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (22)

  1. Procédé de nettoyage de buses de pulvérisation (23) sur un dispositif d'humidification à pulvérisation (2), comprenant les étapes suivantes :
    fourniture d'un dispositif d'humidification à pulvérisation (2) sur lequel sont montées plusieurs buses de pulvérisation (23),
    cloisonnement d'au moins une des buses de pulvérisation vis-à-vis de l'air ambiant par un couvercle protecteur (4),
    fourniture d'un orifice de passage de jet de pulvérisation (42) sur le couvercle protecteur (4) qui est conçu de telle sorte qu'un jet de pulvérisation produit par la buse de pulvérisation peut être pulvérisé à travers l'orifice de passage de jet de pulvérisation (42),
    fourniture d'un réservoir d'air propre séparé de l'air ambiant,
    établissement d'une liaison d'écoulement d'un espace interne, entourant au moins une buse de pulvérisation, du couvercle protecteur (4) avec un réservoir d'air propre (5),
    fourniture d'air propre non comprimé dans le réservoir d'air propre (5),
    adaptation d'une géométrie d'ouverture de l'orifice de passage de jet de pulvérisation (42) par rapport à une géométrie de jet de pulvérisation d'un jet de pulvérisation produit par la buse de pulvérisation de telle sorte qu'une dépression est produite, en raison d'une vitesse d'écoulement du jet de pulvérisation, dans l'orifice de passage de jet de pulvérisation (42) , laquelle dépression provoque un écoulement postérieur de l'air propre hors du réservoir d'air propre (5) dans l'espace intérieur (41) du couvercle protecteur (4).
  2. Procédé selon la revendication 1, l'établissement d'une liaison d'écoulement ayant lieu via la fourniture d'un orifice de boîtier (51) dans une partie de boîtier, adjacente à l'espace interne (41) du couvercle protecteur (4), du dispositif de pulvérisation, l'orifice de boîtier (51) reliant l'espace interne (41) du couvercle protecteur (4) à un espace interne de boîtier (53) du dispositif de pulvérisation.
  3. Procédé selon les revendications 1 ou 2, l'établissement d'une liaison d'écoulement étant assuré par la fourniture d'une conduite d'air propre (52) qui crée la liaison d'écoulement de l'espace interne (41) du couvercle protecteur (4) avec le réservoir d'air propre (5) à l'extérieur de l'espace interne de boîtier (53).
  4. Procédé selon une des revendications 1 à 3, comprenant en outre ou en variante les étapes suivantes
    fourniture du dispositif d'humidification à pulvérisation (2) sur lequel est monté un dispositif de nettoyage de buses de pulvérisation (3) qui a été fabriqué en utilisant un système de conduite fluidique (31) selon une des revendications 12 à 19, et
    production d'un jet fluidique (33) hors d'une des buses de fluide (34) qui est dirigé sur une des buses de pulvérisation (23).
  5. Couvercle protecteur (4) pour l'utilisation en lien avec une buse de pulvérisation (23) d'un dispositif d'humidification à pulvérisation (2) dans des presses, le couvercle protecteur (4) pouvant être disposé autour d'une buse de pulvérisation (23) et comprenant un orifice de passage de jet de pulvérisation (42) qui est conçu de telle sorte qu'en position d'utilisation du couvercle protecteur (4) un jet de pulvérisation produit par la buse de pulvérisation (23) est pulvérisable à travers l'orifice de passage de jet de pulvérisation (42), l'orifice de passage de jet de pulvérisation (42) présentant une géométrie d'ouverture définie par rapport à une géométrie de jet de pulvérisation du jet de pulvérisation produit par la buse de pulvérisation, de sorte que la fourniture du couvercle protecteur (4) sur la buse de pulvérisation (23) crée une pompe à jet à travers laquelle pendant le fonctionnement du dispositif d'humidification à pulvérisation dans l'orifice de passage de jet de pulvérisation (42) en raison du jet de pulvérisation de la buse de pulvérisation peut être produit un courant d'air qui se répand hors de l'espace interne (41) du couvercle protecteur (4) dans un espace de pulvérisation à l'extérieur du couvercle protecteur (4).
  6. Couvercle protecteur (4) selon la revendication 5, l'orifice de passage de jet de pulvérisation (42) présentant une zone de buses qui présente dans la direction de pulvérisation du jet de pulvérisation sur une certaine distance une section transversale d'ouverture essentiellement constante, qui s'étend étroitement le long du jet de pulvérisation.
  7. Couvercle protecteur (4) selon la revendication 5, l'orifice de passage de jet de pulvérisation (42) présentant une zone de diffuseurs raccordée à la zone de buses dans la direction de pulvérisation, le profil de la section transversale d'ouverture dans la zone de diffuseurs s'élargissant depuis la section transversale d'ouverture dans la zone de buses.
  8. Couvercle protecteur (4) selon les revendications 5 ou 6, l'orifice de passage de jet de pulvérisation (42) présentant une zone de confuseurs agencée dans la direction de pulvérisation en amont de la zone de buses, le profil de la section transversale d'ouverture dans la zone de confuseurs se rétrécissant jusqu'à la section transversale d'ouverture dans la zone de buses.
  9. Couvercle protecteur (4) selon une des revendications 5 à 8, le couvercle protecteur étant conçu de telle sorte qu'une embouchure de la buse de pulvérisation (23) est située à l'état monté du couvercle protecteur à une distance en amont de l'orifice de passage de jet de pulvérisation, de telle sorte qu'une zone de mélange est prévue.
  10. Combinaison de couvercle protecteur et de buses de pulvérisation comprenant une buse de pulvérisation (23) d'un dispositif d'humidification à pulvérisation d'une presse et un couvercle protecteur (4) selon une des revendications 5 à 9.
  11. Barre de buses (22) comprenant une combinaison de couvercle protecteur et de buses de pulvérisation selon la revendication 10, le couvercle protecteur (4) entourant la buse de pulvérisation (23) et présentant un orifice de passage de jet de pulvérisation (42) qui est conçu de telle sorte qu'un jet de pulvérisation produit par la buse de pulvérisation peut être pulvérisé à travers l'orifice de passage de jet de pulvérisation (42), la buse de pulvérisation (23) et l'orifice de passage de jet de pulvérisation (42) correspondant étant conçus et agencés l'un par rapport à l'autre, de telle sorte qu'ils forment une pompe à jet. Un espace interne (41) du couvercle protecteur (4) est relié fluidiquement à un réservoir d'air propre sans pression (5), et au moins une buse fluidique (34) qui est associée à au moins une buse de pulvérisation (23) est agencée à l'intérieur du couvercle protecteur (4) .
  12. Barre de buses (22) selon la revendication 11 comprenant un système de conduite fluidique (31), sur lequel est prévue pour chaque buse de pulvérisation (23) du dispositif d'humidification à pulvérisation (2) au moins une buse fluidique (34) qui est conçue et est agencée sur la conduite fluidique de telle sorte qu'un jet fluidique (33) qui est dirigé sur la buse de pulvérisation (23) peut être produit à travers elle.
  13. Barre de buses (22) selon la revendication 12, le système de conduite fluidique (31) comprenant des moyens d'ajustage qui sont conçus de telle sorte que la direction d'éjection des buses fluidiques (34) est ajustable par les moyens d'ajustage.
  14. Barre de buses (22) selon une des revendications précédentes 12 à 13, le système de conduite fluidique (31) comprenant un dispositif de raccordement qui permet de raccorder le système de conduite fluidique (31) à une source fluidique.
  15. Barre de buses (22) selon une des revendications précédentes 12 à 14, le système de conduite fluidique (31) comprenant une soupape fluidique qui permet de commander l'éjection de fluide, le système de conduite fluidique (31) comprenant une soupape fluidique qui permet de commander l'éjection de fluide de chaque buse fluidique (34).
  16. Barre de buses (22) selon une des revendications précédentes 12 à 15, le système de conduite fluidique (31) comprenant plusieurs sources fluidiques peut être relié à différents fluides.
  17. Barre de buses (22) selon une des revendications précédentes 12 à 16, le système de conduite fluidique (31) étant conçu de manière à pouvoir être monté sur une barre de buses (22) du dispositif d'humidification à pulvérisation (2) et/ou dans l'espace de pulvérisation (21) du dispositif d'humidification à pulvérisation (2).
  18. Barre de buses (22) selon une des revendications précédentes 12 à 17, la pression du ou des fluides dans le système de conduite fluidique (31) étant obtenue par le raccordement du système de conduite fluidique (31) à la ou aux sources fluidiques, et/ou une ou plusieurs pompes étant prévue(s) pour la production de pression.
  19. Barre de buses (22) selon une des revendications précédentes 12 à 18, le fluide dans le système de conduite fluidique (31) étant soumis à une pression d'environ 6 bars.
  20. Dispositif d'humidification à pulvérisation (2) d'une presse muni d'une combinaison de couvercle protecteur et de buses de pulvérisation selon la revendication 10 ou muni d'une barre de buses selon une des revendications 11 à 19.
  21. Dispositif d'humidification à pulvérisation (2) selon la revendication 20, comprenant en outre un réservoir d'air propre (5) et une liaison d'écoulement qui relie l'espace interne (41) du couvercle protecteur (4) au réservoir l'air propre (5).
  22. Dispositif d'humidification à pulvérisation (2) selon la revendication 21, dans lequel la liaison d'écoulement est fournie sous forme d'une conduite d'air propre (52) qui relie l'espace interne (41) du couvercle protecteur (4) au réservoir d'air propre (5), et/ou sous forme d'une ouverture de boîtier (51), l'ouverture de boîtier étant fournie dans une partie de boîtier du dispositif de pulvérisation, adjacente à l'espace interne (41) du couvercle protecteur (4), et relie l'espace interne (41) du couvercle protecteur (4) à un espace interne de boîtier (53) du dispositif de pulvérisation.
EP08005366A 2007-03-21 2008-03-20 Procédé et dispositif de nettoyage de buses sur un dispositif d'humidification à pulvérisation Expired - Fee Related EP1972442B1 (fr)

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DE102007013590A DE102007013590A1 (de) 2007-03-21 2007-03-21 Verfahren und Vorrichtung zur Reinigung von Düsen an einem Sprühfeuchtwerk

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US8001889B2 (en) 2011-08-23
DE102007013590A1 (de) 2008-09-25
US20080271618A1 (en) 2008-11-06
EP1972442A1 (fr) 2008-09-24

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