EP1911581A2 - Dispositif de dosage de couleur pour un système d'encrage - Google Patents

Dispositif de dosage de couleur pour un système d'encrage Download PDF

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Publication number
EP1911581A2
EP1911581A2 EP07018553A EP07018553A EP1911581A2 EP 1911581 A2 EP1911581 A2 EP 1911581A2 EP 07018553 A EP07018553 A EP 07018553A EP 07018553 A EP07018553 A EP 07018553A EP 1911581 A2 EP1911581 A2 EP 1911581A2
Authority
EP
European Patent Office
Prior art keywords
ink
metering device
printing
ink metering
color
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Withdrawn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
EP07018553A
Other languages
German (de)
English (en)
Other versions
EP1911581A3 (fr
Inventor
Evgeny Kurmakaev
Thomas Walther
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP1911581A2 publication Critical patent/EP1911581A2/fr
Publication of EP1911581A3 publication Critical patent/EP1911581A3/fr
Withdrawn legal-status Critical Current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
    • B41F7/02—Rotary lithographic machines for offset printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/40—Inking units
    • B41F15/42—Inking units comprising squeegees or doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/22—Inking arrangements or devices for inking from interior of cylinder

Definitions

  • the invention relates to an inking unit or a short inking unit and an associated metering device in a printing press, in particular an offset printing machine.
  • a generic rotary screen printing unit is among others from the DE 102 32 254 known.
  • the rotary screen printing unit comprises a cylinder which is rotatable about a cylinder axis and whose cylinder jacket is at least partially formed by a printing screen.
  • a doctor blade is mounted, which is attached to a doctor blade holder and extends parallel to the cylinder axis. The doctor presses from a paint container in the direction of rotation of the cylinder in front of the doctor blade supplied ink from the interior of the cylinder through the printing screen on the material.
  • a print interruption can also be achieved by briefly raising the squeegee which pushes the ink through the wire.
  • a generic doctor blade having such a function is under US 2006/0086268 disclosed.
  • a rotary screen printer for two-sided printing of signatures, the screen printing apparatus having recesses which prevent the screen from being pushed by the grippers of the sheet leading cylinders.
  • the rotary screen printing cylinder are associated with transfer cylinders, wherein the image is formed on the printing material by the structuring of the screen.
  • the transferred amount of ink is defined by the cell geometry and the resolution of the anilox roller.
  • the anilox roller must be exchanged for another one.
  • the color density can be within narrow limits due to the temperature of the anilox roller, as, inter alia, in the documents DE 10254501 and DE 10218359 disclosed, be regulated.
  • Another approach is found in the scriptures EP 1291177 and DE 19840613 Here, the control of the color density is controlled by the variation of the peripheral speed between the anilox roller and the ink transfer roller.
  • the dosage by means of an anilox roller has some serious disadvantages.
  • a major disadvantage is the high production costs of the anilox rollers, which result in that a short inking unit with a screen roller dosing is not more favorable to produce than a conventional offset inking unit with a long ink roller chair, although the number of parts of the short inking unit compared to the conventional inking unit is significantly lower.
  • Another shortcoming of the ink dosing by means of anilox rollers lies in the high manufacturing tolerances. Although the ink dosing by means of anilox rollers would require an extremely uniform cell structure due to the lack of zonal intervention possibilities, the practice nevertheless repeatedly shows manufacturing tolerances relative to the cell volume of 10 to even 30%, which are reflected in the quality of the dyeing.
  • anilox rollers for ink dosing: During production, paint residues can deposit on the bottom of the cells. If the anilox rollers are not always cleaned completely, which is quite technically demanding, the wells slowly fill up and the transferred color volume and thus the color density on the printed sheet change. This process of adding is not always uniform, so that the color density deviation can not be compensated by a temperature control and / or slip control, as they always only act globally.
  • Another method for color dosing consists in the combination of a metering roller with a roller blade, in which an engraved or structured in another way roll bar with a relatively small diameter in a groove of a holder.
  • the roller bar is pressed against the surface of the metering roller for metering.
  • Generic representatives of such metering devices are inter alia in the DE 10045515 and the DE 19602483 described.
  • This type of metering devices suffer from deflection because of the small diameter, so that roller blade must be supported in several places to ensure a uniform dosage across the width. However, such support increases the cleaning effort significantly, since the doctor supports are in direct contact with the paint film.
  • the roller blade due to the small diameter has the disadvantage of relatively high peripheral speed, which syringes can be generated.
  • the influence of the hydrodynamic pressure in the metering gap on other variants on the color dosage increases significantly.
  • the DE 600 924 describes a paint distributor roller in lifting and duodeneless inking units, inside which a stationary ink chamber is arranged, wherein the ink exits through openings of the uniformly circulating hollow cylindrical ink distributor roller, wherein in the interior of the ink distributor roller a stationary cylinder is arranged so that between it and the distributor roller a very narrow cylindrical channel is formed, to which the ink is supplied through the openings of the cylinder under pressure by known means.
  • a rotating inking roller for printing machines in which the ink is discharged from the interior of an inking roller via two mutually adjustable hollow body and perforations having body to a color-permeable outer shell.
  • the ink is forced through the perforations to the outside.
  • the EP 0 559 076 describes a method for color dosing and an apparatus for performing this method, in which from the interior of an ink roller, the ink is metered through radially extending bores to a shell material of porous material, wherein the dosage of the ink quantity by a constantly variable setting of the flow cross section of the holes Hollow axis with a first tube to each other, that the ink is then dispensed through a number in a rotating second tube number of holes distributed through chambers to the rotating at a differential speed casing tube, through which the ink of the applicator roll is supplied.
  • the DE 32 41 592 discloses a paint applicator sleeve having a compliant microporous ink storage material formed as a sleeve.
  • the DE 103 48 307 discloses an inking roller for an inking unit of an offset printing press having a number of rotationally disposed zones and at least one ink reservoir inside the inking roller, wherein the ink reservoir in each of the plurality of zones communicates with at least one paint exit in the lateral surface of the inking roller.
  • at least one pumping element for conveying the ink from the ink reservoir is assigned to the lateral surface.
  • An adjustment of the dosage takes place exclusively via the Nachêt of the ink and / or by a change in the internal pressure, which can not be regulated as well known, such as. the dosage by a paint slide or colorimeter.
  • the viscoelastic properties of the printing ink alone prevent effective and reproducible ink dosing.
  • the object of the invention is to solve these deficiencies of the known solutions by a new method for color dosing and associated devices.
  • the color metering of offset printing ink in an offset rotary printing unit which comprises at least one plate, rubber and impression cylinder, and by a rotary screen printing device with one or more internally applied doctor blades.
  • the ink in the operating condition, the ink is forced through the ink-permeable jacket of the rotary screen printing device, so that the ink to be printed on the outer surface of the screen printing device removed and in a rolling contact with inking rollers or the plate cylinder to the offset printing unit can be fed.
  • a film gap can be provided for ink transfer in the printing unit.
  • the surface speed of the dye-metering device becomes substantially identical to the surface speed of the inking unit, but can also be chosen differently from the surface speed of the inking unit.
  • a corresponding differential speed should be changeable and adjustable.
  • the color dosing device can be driven separately by means of a single drive via a single drive control.
  • the structure of the ink-permeable jacket of the ink metering device can be provided as a sleeve, wherein the ink-permeable jacket is formed by a plate or fabric, which is attached to the Farbdosier adopted in a fastening device.
  • the lateral surface of the ink metering device is provided with evenly or stochastically distributed openings for ink outlet.
  • the doctor blades provided in the ink metering device may be one or more positive or negative working doctor blades or one or more doctor blades.
  • the ink metering device In the ink metering device, at least one ink supply device, for example a nozzle or a pump device, is provided, which conveys the printing ink into the inner cavity of the ink metering device. It can also be a variety of Be provided color supply means that can cover zonal different color requirements. For this purpose, the ink metering device can be divided into zones inside which an individually controllable ink supply device is assigned. The ink supply is stopped during a business interruption. The amount of ink in the Farbdosierinnate can be monitored by suitable sensors for color quantity control, so that the amount of ink is kept within narrow limits, at the lowest possible level, the same.
  • a color quantity can be calculated in the prepress stage from the image data of each printing unit over the entire printing unit width or zone-related. In the operating state can also be calculated or derived according to the amount of ink to be conveyed. Likewise, on the basis of densitometric and / or colorimetric measurements, the ink feed into the ink metering device can be regulated by a desired-actual comparison.
  • the ink metering can in this case regulate both the ink supply and the differential speed between the ink metering device and a corresponding roller.
  • ink which has not been removed in the ink gap between the ink metering device and the corresponding roller can be scraped off by a positive or negative doctor blade or pressed back into the interior of the ink metering device.
  • rollers can roll on the outer jacket of the ink metering, which serve to equalize the remaining color layer after the color splitting or optionally as an additional evaporation surface for fountain solution.
  • the transferable amount of ink can be changed in a simple manner by changing a first sieve against a sieve having a different color permeability.
  • the inking unit may be part of a sheet-fed or a web offset printing press, which for printing different substrates, such as paper, cardboard, coated paper or cardboard, corrugated cardboard, plastic film or plates or Metal sheets is suitable.
  • substrates such as paper, cardboard, coated paper or cardboard, corrugated cardboard, plastic film or plates or Metal sheets
  • the ink metering device can in this case meter heatset, coldset, conventional oily sheet-fed offset ink, radiation-curing printing ink or dry offset ink.
  • the printing ink may optionally be adapted in its property profile to the processing conditions of the ink metering device.
  • An ink dosing device for an inking unit of an offset printing press has at least one ink dosing device, as used in rotary screen printing.
  • a rotary screen printing device (1) is characterized by a shell which encloses a cavity which can have openings through the paint on the lateral surface of the device, and by a located inside the cavity doctor blade (2), which in the operating state from the inside against the outer jacket is employed.
  • In the interior of the roller there is at least one ink reservoir.
  • the ink dosing device describes a known ink dosing system which is very well suited for the metering of high-viscosity printing inks.
  • the viscosity of the inks in screen printing does not differ significantly from the viscosity of the printing inks in offset printing, which is achieved by such a Farbdosier adopted standard offset or offset inks can be printed with only minor modifications, while in the dosage by means of chambered doctor blade and anilox usually special colors must be used.
  • the ink-permeable jacket of the rotary screen printing device (1) can be formed as a sleeve or in the uninflated state as a flat screen that is stretched around a holding frame and with holding devices, e.g. Is held hook.
  • the material of the screen may be a metal, a metal-plastic compound, a plastic material or a rubber material.
  • the hole pattern can be of uniform or stochastic nature.
  • the rotary screen printing device (1) transfers in the metering operation, the ink on at least one roller (5).
  • the roll may be part of an offset inking unit having a plurality of rollers (11) and a plurality of inking rollers (10), or one or more inking stands (10) of a short inking unit as shown in FIG.
  • the roller may also be a plate cylinder (6) of an offset inking unit, wherein the ink from the rotary screen printing device (1) directly on the offset printing plate or high-pressure plate, which is located on the plate cylinder (6) is dosed (see Figure 6).
  • the plate cylinder can also be imaged directly, then eliminates the pressure plate as a carrier of the image information.
  • the offset printing unit has at least one inking unit according to the invention.
  • the offset printing unit can be a wet offset printing unit, in which the separation between printing and non-printing elements on the printing plate by first on the printing plate with a dampening unit (13) a water film is applied and then in the direction of rotation (9) of the impression cylinder (8 ) Following the ink by means of an inking unit (11) with at least one inking roller (10) applies the ink.
  • the inking unit can also be an offset printing unit, which works in dry offset with Toray plates or with Lettersetplatten (high-pressure plates).
  • the inking unit (11) can have a multiplicity of rollers and comprises iridescent ink drivers for the lateral trituration of the printing ink.
  • the rotary screen printing device (1) can be in contact with an inking roller, as shown in Figure 3, or with multiple inking rollers, as shown in Figure 4.
  • the offset inking unit is part of an offset printing unit, which comprises at least one ink metering device, at least one inking roller (10), a plate cylinder (6), a blanket cylinder (7) and an impression cylinder (8).
  • the printing sheet or the roller conveyor is printed in the printing nip (14) between the rubber (7) and impression cylinder (8).
  • the offset printing unit can be part of a sheet-fed printing press or a web-fed printing press.
  • a sheet-fed printing press can have a feeder, a number of printing units, optionally one or more finishing plants (stamping, Rilltechnik, coating unit, cold foil application), optionally a turning device and a boom.
  • a web-fed printing press may include a roll changer, a number of printing units that print the web on the top and bottom, a dryer and a folder.
  • Typical printing materials that can be printed in the offset printing units according to the invention are paper, plastic films, coated papers and cardboard, cardboard, corrugated cardboard or metal sheets.
  • a rotary screen printing device serves as a color source.
  • the rotary screen printing device has an internal squeegee, which presses against the lateral surface of the screen printing device (1) from at least in the operating state and causes the ink to emerge from the interior to the lateral surface through the openings located in the lateral surface.
  • the doctor blade can be positively or negatively set from the inside against the lateral surface, the doctor can be a squeegee or any other suitable squeegee shape.
  • the lateral surface of the screen printing device (1) rolls on at least one further inking unit roller (5) or on the plate cylinder (6), as shown in Figure 6, from.
  • the rotational speed of the screen printing device (V1) can be identical to the rotational speed of the corresponding roller (5), but the rolling rolling on one another can also have a differential speed, so that a slip occurs, which causes a further dosage and homogenization of the ink film.
  • the direction of rotation (4) of the screen printing device (1) can be the same or opposite to the direction of rotation of the corresponding roller (5). By choosing the direction of rotation can also affect the homogenization of the color film and also a further Dosierönkeit be created.
  • the rolling contact between the screen printing device (1) and the corresponding inking roller / inking rollers (5) or plate cylinder (5) may be between the two elements also a film gap (19), ie the screen printing device (1) and the corresponding roller or plate cylinder (5) stand not in contact with each other.
  • the ink is transferred via the film gap (19).
  • the information on the direction of rotation and the differential speed can be given identically to the information on the touching contact.
  • the drive of the screen printing device (1) can be connected via a gear or a gear group with the drive of the inking unit (11).
  • the drive can also be done via a fixed or adjustable coupling.
  • the screen printing device (1) can also have a single drive (15) which makes the screen printing device (1) independent of the rest of the machine. This single drive (15) is controlled and / or regulated by a single drive control (16).
  • the screen printing device (1) has at least one ink feed, which introduces the ink into the interior of the screen printing device.
  • This ink conveyor is ideally so connected to the machine control that it receives a signal from the machine control and only in case of operation, when ink is needed, color is pumped into the interior of the screen printing device.
  • the screen printing device (1) may also have a plurality of ink supply devices, which may for example cover zonal different color requirements.
  • the screen printing device (1) is ideally divided into zones inside, wherein each zone is associated with a color feeder, which can be advantageously controlled individually.
  • the separation into zones can be done, for example, by radial disks, which are fixedly mounted on a shaft and limit the individual chambers.
  • the amount delivered by the ink-supplying devices may be zonally different depending on the color requirement.
  • doctor device (2) pneumatically, hydraulically, mechanically or electrically is lifted from the inner surface of the lateral surface of the screen printing device (1) and thus no more doctoring of the ink takes place.
  • the doctor blade can be left on or raised against the inner surface of the screen printing device (1) and the ink supply is interrupted. It makes sense to choose the amount of ink in the screen printing always just so that the amount just enough for the ink supply. This can be determined on the basis of predetermined values which are derived, for example, from the zonal areal coverage values or the areal coverage values of the entire printing plate and from which the required quantities of color are then derived via a calculation rule or characteristic curve.
  • the amount of ink in the interior of the screen printing device (1) via one or more sensors constantly monitored and obtained from the sensor signal, a control signal for controlling the amount of ink inside the screen printing device (1).
  • the current color requirement can be determined by a target-actual comparison.
  • These values obtained can be used as a control variable in the sense of a closed-loop control for the ink feed device or the ink feed devices and / or the slip between the ink metering device and the corresponding roller (5).
  • the total amount of metered ink can be easily changed by changing the sieve sleeve or the hinged sieve plate.
  • the amount of ink transferred is determined, inter alia, by the size and number of openings, by the sieve thickness and the mesh size.
  • the gap between the screen printing device (1) and the corresponding roller (5) or the corresponding rollers and ink can also be splitted back on the outer surface of the screen printing device (1).
  • This recycled ink can be scraped off and disposed of or supplied for further use by one or more doctor blade (17), which act from the outside against the lateral surface of the screen printing device.
  • the squeegee pushes the ink back through the openings back into the interior of the ink metering, so that the ink can be reused.
  • rollers or a group of rollers can roll on the outer surface of the screen printing device in contact, which are not in the flow of color and uniform the surface profile.
  • this roll group can be doctored off by a doctor or more squeegee.
  • a roller group rolling on the lateral surface of the screen printing device additionally has the advantage that the surface of the inking unit is enlarged when used in a short inking unit. When used in wet offset, the evaporation of the often disturbing dampening solution is thereby promoted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Screen Printers (AREA)
EP07018553A 2006-10-12 2007-09-21 Dispositif de dosage de couleur pour un système d'encrage Withdrawn EP1911581A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610048329 DE102006048329A1 (de) 2006-10-12 2006-10-12 Farbdosiereinrichtung für ein Farbwerk

Publications (2)

Publication Number Publication Date
EP1911581A2 true EP1911581A2 (fr) 2008-04-16
EP1911581A3 EP1911581A3 (fr) 2011-11-16

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ID=38828376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07018553A Withdrawn EP1911581A3 (fr) 2006-10-12 2007-09-21 Dispositif de dosage de couleur pour un système d'encrage

Country Status (2)

Country Link
EP (1) EP1911581A3 (fr)
DE (1) DE102006048329A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3569415A1 (fr) * 2018-05-16 2019-11-20 Giesecke+Devrient Currency Technology GmbH Machine de sérigraphie et procédé de sérigraphie à l'aide d'un pochoir cylindrique
CN112829456A (zh) * 2021-01-04 2021-05-25 赵永艳 一种印刷机用具有刮壁式旋转结构的墨筒

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807302A (en) * 1971-07-20 1974-04-30 Zimmer P Roller squeegee device with fluid pressure increasing means
US3871411A (en) * 1972-09-07 1975-03-18 Satosen Co Ltd Seamless screen pipes
DE2915362A1 (de) * 1978-04-28 1979-11-08 Buser Ag Maschf Fritz Rakelvorrichtung fuer eine siebdruckmaschine
NL7812603A (nl) * 1978-12-28 1980-07-01 Thomassen & Drijver Inrichting voor het gedoseerd toevoeren van inkt aan een drukcilinder.
US4444105A (en) * 1981-09-23 1984-04-24 Mathias Mitter Apparatus for applying ink to napped fabrics or the like
GB2150081A (en) * 1983-11-24 1985-06-26 Miller Johannisberg Druckmasch Inking or applicator mechanism for a rotary offset printing machine
EP0396924A2 (fr) * 1989-05-11 1990-11-14 Stork MBK GmbH Dispositif pour la transmission synchronisée de plusieurs écrans d'une machine de sérigraphie rotative

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4226155B2 (ja) * 1998-08-21 2009-02-18 株式会社小森コーポレーション 凹版印刷機
EP1250226B1 (fr) * 2000-01-25 2005-04-27 Koenig & Bauer Aktiengesellschaft Presse pour impression en creux
BR0017011A (pt) * 2000-01-25 2002-10-22 Koenig & Bauer Ag Unidade de impressão
JP2001225441A (ja) * 2000-02-16 2001-08-21 Komori Corp 印刷機

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807302A (en) * 1971-07-20 1974-04-30 Zimmer P Roller squeegee device with fluid pressure increasing means
US3871411A (en) * 1972-09-07 1975-03-18 Satosen Co Ltd Seamless screen pipes
DE2915362A1 (de) * 1978-04-28 1979-11-08 Buser Ag Maschf Fritz Rakelvorrichtung fuer eine siebdruckmaschine
NL7812603A (nl) * 1978-12-28 1980-07-01 Thomassen & Drijver Inrichting voor het gedoseerd toevoeren van inkt aan een drukcilinder.
US4444105A (en) * 1981-09-23 1984-04-24 Mathias Mitter Apparatus for applying ink to napped fabrics or the like
GB2150081A (en) * 1983-11-24 1985-06-26 Miller Johannisberg Druckmasch Inking or applicator mechanism for a rotary offset printing machine
EP0396924A2 (fr) * 1989-05-11 1990-11-14 Stork MBK GmbH Dispositif pour la transmission synchronisée de plusieurs écrans d'une machine de sérigraphie rotative

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3569415A1 (fr) * 2018-05-16 2019-11-20 Giesecke+Devrient Currency Technology GmbH Machine de sérigraphie et procédé de sérigraphie à l'aide d'un pochoir cylindrique
CN112829456A (zh) * 2021-01-04 2021-05-25 赵永艳 一种印刷机用具有刮壁式旋转结构的墨筒
CN112829456B (zh) * 2021-01-04 2022-07-01 山东润声印务有限公司 一种印刷机用具有刮壁式旋转结构的墨筒

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Publication number Publication date
DE102006048329A1 (de) 2008-04-17
EP1911581A3 (fr) 2011-11-16

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