EP0887204B1 - Method for cleaning printing forms - Google Patents

Method for cleaning printing forms Download PDF

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Publication number
EP0887204B1
EP0887204B1 EP98109903A EP98109903A EP0887204B1 EP 0887204 B1 EP0887204 B1 EP 0887204B1 EP 98109903 A EP98109903 A EP 98109903A EP 98109903 A EP98109903 A EP 98109903A EP 0887204 B1 EP0887204 B1 EP 0887204B1
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EP
European Patent Office
Prior art keywords
cleaning
cleaning fluid
concentrate
percent
several
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98109903A
Other languages
German (de)
French (fr)
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EP0887204A2 (en
EP0887204A3 (en
Inventor
Dieter Schmitt
Reiner Schmitt
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication of EP0887204A3 publication Critical patent/EP0887204A3/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/046—Salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/06—Preparing for use and conserving printing surfaces by use of detergents
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/83—Mixtures of non-ionic with anionic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/32—Amides; Substituted amides
    • C11D3/323—Amides; Substituted amides urea or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/38—Cationic compounds
    • C11D1/52—Carboxylic amides, alkylolamides or imides or their condensation products with alkylene oxides
    • C11D1/523—Carboxylic alkylolamides, or dialkylolamides, or hydroxycarboxylic amides (R1-CO-NR2R3), where R1, R2 or R3 contain one hydroxy group per alkyl group
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • C11D1/72—Ethers of polyoxyalkylene glycols
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines

Definitions

  • the invention relates to a method for cleaning illustrated Printing forms of imaging residues according to the preamble of claim 1.
  • the plate imaging, e.g. B. directly in the printing press without a conventional one Disk copy is done using a computer, which data for in a grid Image processor to generate bitmap files from electronic publishing systems takes over and sends a bitmap to the printing units for each printing ink.
  • There each of the print heads depicts specially coated printing forms Printing form cylinders.
  • the printing forms can have a three-layer structure have, e.g. with a carrier layer based on polyester, one on the Backing layer applied printing layer based on titanium, which can have infrared absorbing properties, and one on the printing Non-printing layer based on silicone, e.g. Silicone rubber.
  • Such printing forms can be used in offset printing without dampening solution Dry offset - can be used.
  • the printing forms can be used as printing plates or - Films are clamped onto the printing form cylinder or in some other way these are applied.
  • the application of a liquid layer on the Printing form surface with subsequent hardening of the layer is possible.
  • the ablative imaging can be done using a print head, e.g. by sparks generated by electrodes or by sparks generated by laser diodes Laser beams on the printing form the color-guiding layer is exposed, the non-printing cover layer at the printing points, the pixels, thermally is decomposed or evaporated. As residues of this imaging process there remain particles and conversion products of the non-printing and also the possibly slightly attacked printing layer on the printing Areas of the printing form.
  • imaging residues must be removed so that good color acceptance at these points and no toning occurs and on High quality print image is achieved.
  • the removal of the imaging residues can be done manually and / or mechanically by means of a cleaning device, by using a cleaning organ, e.g. a cleaning cloth under well-dosed pressure the printing form surface a - e.g. by rotating the plate cylinder rack-fixed cleaning organ - relative movement to the cleaned Printing form surface executes.
  • the printing plate cleaning fluid can before and during the cleaning process towards the cleaning member and / or the cleaning printing surface applied, e.g. are sprayed.
  • Cleaning fluids containing isopropanol can be used for cleaning printing forms with a printing layer based on titanium and a non-printing layer based on silicone containing alcohol.
  • Such Cleaning fluids are also used in printing machines for cleaning rollers and Cylinders of paint residues and other contaminants used.
  • the low flash point of the isopropanol contained that at the Printing form cleaning evaporating isopropanol can together with the Ambient air form a flammable gas mixture and with one of the Printing plate cleaning immediately following another imaging process the high temperatures caused by these are ignited.
  • the invention has for its object to provide a method with which thorough cleaning of a printing form of imaging residues can be achieved, and to propose a cleaning fluid for use in printing plate cleaning, by which the disadvantages of the above-mentioned prior art are avoided become.
  • a cleaning organ a defined contact pressure on the to be cleaned Printing form surface exerts a relative movement between printing form and Cleaning organ takes place and a cleaning fluid on the to be cleaned Printing form surface is applied and using a cleaning fluid which contains a cleaning concentrate in addition to water as a component, the 1st up to 30% by mass, preferably 20 to 30% by mass, of an anionic surfactant and 1 to 30% by mass, preferably 20 to 30% by mass, of a nonionic Contains surfactants.
  • an anionic surfactant alkylbenzenesulfonate and nonionic surfactant, alcohol ethoxylate can be used.
  • the Cleaning concentrate can contain 0.1 to 5 percent by weight of regreasing components contain. Fatty acid diethanolamides or Carbonic acid amide can be used.
  • the cleaning concentrate can be 1 to 25 Mass percent solubilizers, preservatives, e.g. B 0.05 to 3 Mass percent preservative, a disinfectant Sodium silver chloride complex base, complexing agents, e.g. B. 0.1 to 2 Mass percent hardness stabilizers included.
  • that Cleaning concentrate contain water.
  • the cleaning fluid 1 up to 25 percent by volume of cleaning concentrate.
  • can Cleaning fluid contain 1 to 2.5 percent by volume of cleaning concentrate.
  • the negative decimal logarithm of the Hydrogen ion concentration of the cleaning fluid has a value between 5 and 8 exhibit.
  • Suitable cleaning organs can be Wipes - especially wipeable towels - or tapes, rollers, brushes, Brush rollers and pressure elements with fabric, plush and fleece-like or different surface structure with suction and / or cleaning action use.
  • the cleaning member can preferably be rotated with a printing plate cylinder much slower speed than the machine speed - in so-called creeper - take place. An additional traversing movement of the Cleaning device in the direction of the plate cylinder axis is possible. There can be several Cleaning cycles, e.g.
  • the method according to the invention can be used both for the cleaning of images Offset printing form of the conventional offset process using a Fountain solution and for cleaning dry offset printing plates for the waterless Offset printing as well as for cleaning illustrated printing forms of the direct Flat printing (Dilitho) as well as for cleaning in the computer to press or Use the computer-to-plate process to print images directly illustrated, if the have a non-printing layer based on silicone.
  • Fig. 1 is the construction of an imageable printing form, consisting of a stable Carrier layer 1 based on polyester, e.g. 0.18 mm thick, a printing Layer 2 based on titanium and a non-printing layer 3 based on silicone, by e.g. 2-3 ⁇ m thickness, shown, on the bottom of the pixel 4, e.g. 35 ⁇ m diameter, there are imaging residues 5, 6 to be removed.
  • a stable Carrier layer 1 based on polyester e.g. 0.18 mm thick
  • a printing Layer 2 based on titanium
  • a non-printing layer 3 based on silicone, by e.g. 2-3 ⁇ m thickness, shown, on the bottom of the pixel 4, e.g. 35 ⁇ m diameter, there are imaging residues 5, 6 to be removed.
  • Fig. 2 an advantageously designed cleaning member 7, 8 is shown, the further cleaning cloth 8 by an elastic pressure element 7 against the Surface of the printing form 9 which is clamped on the printing form cylinder 10 can, can be employed.
  • the contact pressure can be a pressurizable element 11, e.g. a pressurizable air Profile hose element, defined.
  • printing form 9 can be fed directly onto the printing form 9, such as shown, or on an application and / or cleaning roller, e.g. a brush roller, is sprayed on or by using a pressure element, in particular one with Capillary effect of the material, and a cleanable cleaning cloth on the Printing form 9 is applied.
  • the printing form cylinder 10 leads in the crawl gear Printing machine rotary movements of both directions of rotation driven by the drive of the printing press. This way both Imaging residues 5 behind the leading edges of the printing Pixel as well as the imaging residues 6 at the angle of the trailing Edges safely removed by the cleaning element (see Figure 1).
  • the Pressing element 7 and the cleaning cloth 8 can during the cleaning process Carry out an oscillating movement in the direction of the printing cylinder axis.
  • the cleaning fluid can have the following composition, for example: Cleaning concentrate 2.5 volume percent water 97.5 volume percent
  • the cleaning concentrate can also contain preservatives and Contain complexing agents, which depend on the mass of the Cleaning concentrate related percentages of these components can preferably be less than 1%.
  • the resulting mass difference between the sum of the above proportions and 100% can consist of water.
  • the pH value of the cleaning concentrate can be 7.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Detergent Compositions (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Reinigen von bebilderten Druckformen von Bebilderungsrückständen gemäß dem Oberbegriff von Anspruch 1.The invention relates to a method for cleaning illustrated Printing forms of imaging residues according to the preamble of claim 1.

Die Plattenbebilderung, z. B. direkt in der Druckmaschine ohne eine konventionelle Plattenkopie, erfolgt mittels eines Computers, welcher Daten für in einem Raster Image Processor zu erzeugende bitmap-Dateien aus electronic-publishing-Systemen übernimmt und für jede Druckfarbe eine Bitmap zu den Druckwerken sendet. Dort bebildert jeweils ein Schreibkopf speziell beschichtete Druckformen auf Druckformzylindern. Die Druckformen können einen dreischichtigen Aufbau aufweisen, z.B. mit einer Trägerschicht auf Polyester-Basis, einer auf die Trägerschicht aufgebrachten druckenden Schicht auf Titan-Basis, welche infrarotabsorbierende Eigenschaften aufweisen kann, und einer auf die druckende Schicht aufgebrachten nichtdruckenden Schicht auf Silikon-Basis, z.B. Silikongummi. Derartige Druckformen können im Offsetdruck ohne Feuchtmittel - dem Trockenoffset - eingesetzt werden. Die Druckformen können als Druckplatten oder -folien auf den Druckformzylinder aufgespannt werden oder auf andere Weise auf diesen aufgebracht werden. Das Aufbringen einer flüssigen Schicht auf die Druckformmantelfläche mit nachfolgender Härtung der Schicht ist möglich. Die ablative Bebilderung kann mittels eines Schreibkopfes erfolgen, indem z.B. durch von Elektroden erzeugte Funken oder durch von Laserdioden erzeugte Laserstrahlen auf der Druckform die farbführende Schicht freigelegt wird, wobei die nichtdruckende Deckschicht an den druckenden Stellen, den Bildpunkten, thermisch zersetzt oder verdampft wird. Als Rückstände dieses Bebilderungsprozesses verbleiben Partikel und Umwandlungsprodukte der nichtdruckenden und auch der eventuell geringfügig angegriffenen druckenden Schicht auf den druckenden Bereichen der Druckform. Diese Bebilderungsrückstände müssen entfernt werden, damit eine gute Farbannahme an diesen Stellen und kein Tonen auftritt und ein Druckbild hoher Qualität erzielt wird. Die Entfernung der Bebilderungsrückstände kann manuell und/oder maschinell mittels einer Reinigungseinrichtung erfolgen, indem ein Reinigungsorgan, z.B. ein Reinigungstuch, unter wohldosiertem Druck auf die Druckformoberfläche eine - z.B. durch ein Drehen des Plattenzylinders bei gestellfixem Reinigungsorgan bewirkte - Relativbewegung zur zu reinigenden Druckformoberfläche ausführt. Dabei kann das Druckformreinigungsfluid vor und während des Reinigungsvorganges auf das Reinigungsorgan und/oder die zu reinigende Druckformoberfläche aufgebracht, z.B. gesprüht, werden.The plate imaging, e.g. B. directly in the printing press without a conventional one Disk copy is done using a computer, which data for in a grid Image processor to generate bitmap files from electronic publishing systems takes over and sends a bitmap to the printing units for each printing ink. There each of the print heads depicts specially coated printing forms Printing form cylinders. The printing forms can have a three-layer structure have, e.g. with a carrier layer based on polyester, one on the Backing layer applied printing layer based on titanium, which can have infrared absorbing properties, and one on the printing Non-printing layer based on silicone, e.g. Silicone rubber. Such printing forms can be used in offset printing without dampening solution Dry offset - can be used. The printing forms can be used as printing plates or - Films are clamped onto the printing form cylinder or in some other way these are applied. The application of a liquid layer on the Printing form surface with subsequent hardening of the layer is possible. The ablative imaging can be done using a print head, e.g. by sparks generated by electrodes or by sparks generated by laser diodes Laser beams on the printing form the color-guiding layer is exposed, the non-printing cover layer at the printing points, the pixels, thermally is decomposed or evaporated. As residues of this imaging process there remain particles and conversion products of the non-printing and also the possibly slightly attacked printing layer on the printing Areas of the printing form. These imaging residues must be removed so that good color acceptance at these points and no toning occurs and on High quality print image is achieved. The removal of the imaging residues can be done manually and / or mechanically by means of a cleaning device, by using a cleaning organ, e.g. a cleaning cloth under well-dosed pressure the printing form surface a - e.g. by rotating the plate cylinder rack-fixed cleaning organ - relative movement to the cleaned Printing form surface executes. The printing plate cleaning fluid can before and during the cleaning process towards the cleaning member and / or the cleaning printing surface applied, e.g. are sprayed.

Die DE 195 15 721 beschreibt eine Vorrichtung zur Reinigung von Zylinderoberflächen in Rotationsdruckmaschinen, mittels welcher sich ein Reinigungstuch besonders günstig beim Reinigungsvorgang an eine Mantelfläche eines zu reinigenden Zylinders pressen läßt, wobei Form- und Materialungenauigkeiten ausgeglichen werden sowie der Anpreßdruck über die Formatbreite vergleichmäßigt wird. Dadurch kann ein hinreichend hoher Anpreßdruck erzeugt werden, um Silikonrückstände und andere bei der Direktbebilderung einer Druckform entstehenden Rückstände von der Druckformoberfläche nach Anlösung vollständig durch die Reinigungstuchbahn abzunehmen. Weiterhin wird vermieden, daß ein das Reinigungstuch anpressendes Andrückelement durch ein aggressives Waschmittel, welches zum Anlösen von Silikon Lösungsmittel enthält, chemisch angegriffen wird.DE 195 15 721 describes a device for cleaning Cylinder surfaces in rotary printing machines, by means of which a Cleaning cloth particularly cheap during the cleaning process on a lateral surface of a cylinder to be cleaned can be pressed, form and Material inaccuracies are compensated for and the contact pressure via the Format width is evened out. This allows a sufficiently high Contact pressure is generated to remove silicone residues and others at the Direct imaging of residues from the printing form Printing plate surface completely after dissolving through the cleaning cloth web to decrease. Furthermore, it is avoided that a pressing on the cleaning cloth Pressure element by an aggressive detergent, which is used to dissolve Contains silicone solvent, is chemically attacked.

Es ist bekannt, daß zur Reinigung von Druckformen mit einer druckenden Schicht auf Titan-Basis und einer nichtdruckenden Schicht auf Silikon-Basis alkoholhaltige, z.B. isopropanolhaltige Reinigungsfluide verwendbar sind. Derartige Reinigungsfluide werden in Druckmaschinen auch zur Reinigung von Walzen und Zylindern von Farbresten und anderen Verschmutzungen eingesetzt. Nachteilig wirkt sich jedoch der niedrige Flammpunkt des enthaltenen Isopropanols aus. Das bei der Druckformreinigung verdunstende Isopropanol kann zusammen mit der Umgebungsluft ein entzündbares Gasgemisch bilden und bei einem der Druckformreinigung unmittelbar folgenden weiteren Bebilderungsvorgang aufgrund der durch diesen verursachten hohen Temperaturen entzündet werden. Um der Explosionsgefahr entgegenzuwirken, ist eine Absaugung des Gasgemisches während des Reinigungsvorganges notwendig, da zwischen den Bebilderungsvorgängen zweier Druckformen aus wirtschaftlichen Gründen nicht soviel Zeit zur Verfügung steht, daß ein hinreichendes Verflüchtigen und Verteilen des Gasgemisches abgewartet werden kann. Weiterhin sind isopropanolhaltige Reinigungsfluide, je nach Konzentration des Isopropanols mehr oder weniger, umwelt- und gesundheitsbelastend.It is known that for cleaning printing forms with a printing layer based on titanium and a non-printing layer based on silicone containing alcohol, e.g. Cleaning fluids containing isopropanol can be used. Such Cleaning fluids are also used in printing machines for cleaning rollers and Cylinders of paint residues and other contaminants used. Has a disadvantage however, the low flash point of the isopropanol contained. That at the Printing form cleaning evaporating isopropanol can together with the Ambient air form a flammable gas mixture and with one of the Printing plate cleaning immediately following another imaging process the high temperatures caused by these are ignited. To the To counteract the risk of explosion is an extraction of the gas mixture necessary during the cleaning process because between the Imaging processes of two printing forms not for economic reasons so much time is available that there is sufficient volatilization and distribution of the gas mixture can be waited for. They also contain isopropanol Cleaning fluids, depending on the concentration of isopropanol more or less, polluting the environment and health.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, mit dem eine gründliche Reinigung einer Druckform von Bebilderungsrückständen erzielbar ist, und ein Reinigungsfluid zur Verwendung zur Druckformreinigung vorzuschlagen, durch welches die Nachteile des obengenannten Standes der Technik vermieden werden.The invention has for its object to provide a method with which thorough cleaning of a printing form of imaging residues can be achieved, and to propose a cleaning fluid for use in printing plate cleaning, by which the disadvantages of the above-mentioned prior art are avoided become.

Diese Aufgabe wird gemäß der Erfindung durch ein Verfahren mit den Merkmalen von Anspruch 1 und durch die Verwendung eines Reinigungsfluids gemäß der Merkmale von Anspruch 16 gelöst. Weitere Merkmale sind in den Unteransprüchen enthalten.This object is achieved according to the invention by a method with the features of claim 1 and by using a cleaning fluid according to the Features of claim 16 solved. Further features are in the subclaims contain.

Gemäß der Erfindung ist ein Verfahren zur Reinigung einer bebilderten Druckform mit einer nichtdruckenden Schicht auf Silikon-Basis vorgesehen, wobei ein Reinigungsorgan einen definierten Anpreßdruck auf die zu reinigende Druckformoberfläche ausübt, eine Relativbewegung zwischen Druckform und Reinigungsorgan erfolgt und ein Reinigungsfluid auf die zu reinigende Druckformoberfläche aufgebracht wird und bei dem ein Reinigungsfluid verwendet wird, welches neben Wasser als Bestandteil ein Reinigungskonzentrat enthält, das 1 bis 30 Masseprozent, vorzugsweise 20 bis 30 Masseprozent, eines anionischen Tensids und 1 bis 30 Masseprozent, vorzugsweise 20 bis 30 Masseprozent, eines nichtionischen Tensids entält. Als anionisches Tensid kann Alkylbenzolsulfonat und als nichtionisches Tensid kann Alkoholetoxylat verwendet werden. Das Reinigungskonzentrat kann 0,1 bis 5 Masseprozent Rückfettungskomponenten enthalten. Als Rückfettungskomponenten können Fettsäurediethanolamide bzw. Kohlensäureamid verwendet werden. Das Reinigungskonzentrat kann 1 bis 25 Masseprozent Lösungsvermittler, Konservierungsmittel, z. B 0,05 bis 3 Masseprozent Konservierungsmittel, ein Desinfektionsmittel auf Natrium-Silberchlorid-Komplex-Basis, Komplexierungsmittel, z. B. 0,1 bis 2 Masseprozent Härtestabilisatoren, enthalten. Weiterhin kann das Reinigungskonzentrat Wasser enthalten. Das Reinigungsfluid kann neben Wasser 1 bis 25 Volumenprozent Reinigungskonzentrat enthalten. Vorzugsweise kann das Reinigungsfluid 1 bis 2,5 Volumenprozent Reinigungskonzentrat enthalten. Vorzugsweise kann der negative dekadische Logarithmus der Wasserstoffionenkonzentration des Reinigungsfluides einen Wert zwischen 5 und 8 aufweisen.According to the invention is a method for cleaning an illustrated printing form provided with a non-printing layer based on silicone, wherein a Cleaning organ a defined contact pressure on the to be cleaned Printing form surface exerts a relative movement between printing form and Cleaning organ takes place and a cleaning fluid on the to be cleaned Printing form surface is applied and using a cleaning fluid which contains a cleaning concentrate in addition to water as a component, the 1st up to 30% by mass, preferably 20 to 30% by mass, of an anionic surfactant and 1 to 30% by mass, preferably 20 to 30% by mass, of a nonionic Contains surfactants. As an anionic surfactant, alkylbenzenesulfonate and nonionic surfactant, alcohol ethoxylate can be used. The Cleaning concentrate can contain 0.1 to 5 percent by weight of regreasing components contain. Fatty acid diethanolamides or Carbonic acid amide can be used. The cleaning concentrate can be 1 to 25 Mass percent solubilizers, preservatives, e.g. B 0.05 to 3 Mass percent preservative, a disinfectant Sodium silver chloride complex base, complexing agents, e.g. B. 0.1 to 2 Mass percent hardness stabilizers included. Furthermore, that Cleaning concentrate contain water. In addition to water, the cleaning fluid 1 up to 25 percent by volume of cleaning concentrate. Preferably that can Cleaning fluid contain 1 to 2.5 percent by volume of cleaning concentrate. The negative decimal logarithm of the Hydrogen ion concentration of the cleaning fluid has a value between 5 and 8 exhibit.

Überraschenderweise stellte sich heraus, daß sich gute Reinigungsergebnisse erzielen lassen, wenn anstelle eines alkoholhaltigen Reinigungsfluides ein Reinigungsfluid verwendet wird, welches neben Wasser ein für die Verwendung im Haushalt, z.B. für das Spülen von Geschirr, geeignetes Reinigungskonzentrat enthält. Auf diese Weise ist eine Explosionsgefahr ausgeschlossen und kann den Gesundheits- und Umweltschutzerfordernissen auf beste Weise entsprochen werden. Weitere Untersuchungen zeigten, daß sich der beste Reinigungseffekt mit einem Reinigungsfluid obengenannter vorzugsweiser prozentualer Zusammensetzung erreichen läßt. Als geeignete Reinigungsorgane lassen sich Tücher - insbesondere weitertaktbare Tücher - oder Bänder, Walzen, Bürsten, Bürstenwalzen und Andrückelemente mit gewebe-, plüsch- und vliesartiger oder andersartiger Oberflächenstruktur mit Saug- und/oder Reinigungswirkung verwenden. Surprisingly, it turned out that there were good cleaning results can be achieved if instead of an alcohol-containing cleaning fluid Cleaning fluid is used, which in addition to water for use in Household, e.g. for washing dishes, suitable cleaning concentrate contains. In this way, an explosion risk is excluded and can Health and environmental protection requirements met in the best way become. Further studies showed that the best cleaning effect with a preferred percentage cleaning fluid of the above Can achieve composition. Suitable cleaning organs can be Wipes - especially wipeable towels - or tapes, rollers, brushes, Brush rollers and pressure elements with fabric, plush and fleece-like or different surface structure with suction and / or cleaning action use.

Durch die gemeinsame Anwendung eines solchen Reinigungsorganes und des erfindungsgemäßen Reinigungsfluids wird eine gründliche Reinigung der Druckform ermöglicht und bei sachgerechter Durchführung eine Beschädigung der Druckform durch ein etwaiges Zerkratzen vermieden. Somit kann auch ein beim nachfolgenden Drucken aufgrund mangelhafter Reinigung auftretendes Tonen vermieden werden. Die Relativbewegung zwischen Druckform und fixierbarem, z.B. gestellfixem, Reinigungsorgan kann vorzugsweise durch eine Druckformzylinderrotation mit einer wesentlich langsameren Geschwindigkeit als die Maschinengeschwindigkeit - im sogenannten Kriechgang - erfolgen. Eine zusätzliche traversierende Bewegung des Reinigungsorganes in Plattenzylinderachsenrichtung ist möglich. Es können mehrere Reinigungsgänge, z.B. eine trockene Hauptreinigung mit Absaugung der Bebilderungrückstände und eine nachfolgende Feinreinigung bei Einsatz des Reinigungsfluides, ein Spülen und ein Trockenwischen sowie ein Verändern der Rotationsgeschwindigkeit und des Drehrichtungssinnes des Druckformzylinders, ein Wechseln des eingesetzten Reinigungsorganes sowie der Einsatz mehrerer Reinigungsfluide mit unterschiedlicher prozentualer Zusammensetzung und Konzentration des Reinigungskonzentrats während der Reinigung einer Druckform vorgesehen sein.By jointly using such a cleaning organ and Cleaning fluids according to the invention is a thorough cleaning of the printing form enables and if properly carried out damage to the printing form avoided by scratching. Thus, one can also do the following Avoid toning that occurs due to poor cleaning. The relative movement between printing form and fixable, e.g. frame fixed, The cleaning member can preferably be rotated with a printing plate cylinder much slower speed than the machine speed - in so-called creeper - take place. An additional traversing movement of the Cleaning device in the direction of the plate cylinder axis is possible. There can be several Cleaning cycles, e.g. a dry main cleaning with suction of the Imaging residues and a subsequent fine cleaning when using the Cleaning fluids, rinsing and dry wiping and changing the Rotation speed and the direction of rotation of the printing form cylinder Changing the cleaning element used and the use of several Cleaning fluids with different percentage composition and Concentration of the cleaning concentrate during the cleaning of a printing form be provided.

Das erfindungsgemäße Verfahren läßt sich sowohl zur Reinigung von bebilderten Offsetdruckform des konventionelle Offsetverfahrens mit Verwendung eines Feuchtmittels und zur Reinigung von Trockenoffsetdruckformen für den wasserlosen Offsetdruck als auch zur Reinigung von bebilderten Druckformen des direkten Flachdrucks (Dilitho) sowie zur Reinigung von im Computer-to- press oder Computer-to-plate-Verfahren direkt bebilderten Druckformen anwenden, wenn die genannten Druckformen eine nichtdruckende Schicht auf Silikonbasis aufweisen.The method according to the invention can be used both for the cleaning of images Offset printing form of the conventional offset process using a Fountain solution and for cleaning dry offset printing plates for the waterless Offset printing as well as for cleaning illustrated printing forms of the direct Flat printing (Dilitho) as well as for cleaning in the computer to press or Use the computer-to-plate process to print images directly illustrated, if the have a non-printing layer based on silicone.

Die Erfindung wird nachfolgend mit Bezug auf die Zeichnung erläutert. The invention is explained below with reference to the drawing.

Es zeigt:

Figur 1
eine schematische Darstellung eines Rasterpunktes einer bebilderten Druckform im Querschnitt
Figur 2
ein besonders vorteilhaft ausgebildetes Reinigungsorgan.
It shows:
Figure 1
a schematic representation of a halftone dot of an illustrated printing form in cross section
Figure 2
a particularly advantageous cleaning organ.

In Fig. 1 ist der Aufbau einer bebilderbaren Druckform, bestehend aus einer stabilen Trägerschicht 1 auf Polyesterbasis von, z.B. 0,18 mm Dicke, einer druckenden Schicht 2 auf Titanbasis und einer nichtdruckenden Schicht 3 auf Silikonbasis, von z.B. 2-3µm Dicke, dargestellt, wobei auf dem Grund des Bildpunktes 4, von z.B. 35 µm Durchmesser, zu entfernende Bebilderungsrückstände 5, 6 vorhanden sind.In Fig. 1 is the construction of an imageable printing form, consisting of a stable Carrier layer 1 based on polyester, e.g. 0.18 mm thick, a printing Layer 2 based on titanium and a non-printing layer 3 based on silicone, by e.g. 2-3µm thickness, shown, on the bottom of the pixel 4, e.g. 35 µm diameter, there are imaging residues 5, 6 to be removed.

In Fig. 2 ist ein vorteilhaft ausgebildetes Reinigungsorgan 7, 8 dargestellt, wobei das weitertaktbare Reinigungstuch 8 durch ein elastisches Andrückelement 7 gegen die Oberfläche der Druckform 9, welche auf dem Druckformzylinder 10 aufgespannt sein kann, angestellt werden kann. Der Anpreßdruck kann dabei über ein druckmittelbeaufschlagbares Organ 11, z.B. ein druckluftbeaufschlagbares Profilschlauchelement, definiert eingestellt werden.In Fig. 2, an advantageously designed cleaning member 7, 8 is shown, the further cleaning cloth 8 by an elastic pressure element 7 against the Surface of the printing form 9 which is clamped on the printing form cylinder 10 can, can be employed. The contact pressure can be a pressurizable element 11, e.g. a pressurizable air Profile hose element, defined.

Wie in Fig. 2 schematisch dargestellt, kann das im Reservoir 12 befindliche Reinigungsfluid 13 mittels einer Pumpe 14, der mit der Bebilderungseinheit 15 direkt bebilderten Druckform 9 zugeführt werden, indem es direkt auf die Druckform 9, wie gezeigt, oder auf eine Auftrags- und/oder Reinigungswalze, z.B. eine Bürstenwalze, aufgesprüht wird oder indem es über ein Andrückelement, insbesondere eines mit Kapillareffekt des Materials, und ein weitertaktbares Reinigungstuch auf die Druckform 9 aufgebracht wird. Der Druckformzylinder 10 führt im Kriechgang der Druckmaschine Drehbewegungen beider Drehrichtungssinne aus und wird dabei vom Antrieb der Druckmaschine angetrieben. Auf diese Weise werden sowohl die Bebilderungsrückstände 5 hinter den beim Drucken vorlaufenden Kanten des Bildpunktes als auch die Bebilderungsrückstände 6 im Winkel der nachlaufenden Kanten sicher durch das Reinigungsorgan entfernt (siehe Figur 1). Das Andrückelement 7 und das Reinigungstuch 8 können beim Reinigungsvorgang eine in Richtung Druckformzylinderachse changierende Bewegung ausführen.As shown schematically in Fig. 2, that located in the reservoir 12 can Cleaning fluid 13 by means of a pump 14, which is directly connected to the imaging unit 15 illustrated printing form 9 can be fed directly onto the printing form 9, such as shown, or on an application and / or cleaning roller, e.g. a brush roller, is sprayed on or by using a pressure element, in particular one with Capillary effect of the material, and a cleanable cleaning cloth on the Printing form 9 is applied. The printing form cylinder 10 leads in the crawl gear Printing machine rotary movements of both directions of rotation driven by the drive of the printing press. This way both Imaging residues 5 behind the leading edges of the printing Pixel as well as the imaging residues 6 at the angle of the trailing Edges safely removed by the cleaning element (see Figure 1). The Pressing element 7 and the cleaning cloth 8 can during the cleaning process Carry out an oscillating movement in the direction of the printing cylinder axis.

Das Reinigungsfluid kann beispielsweise folgende Zusammensetzung aufweisen: Reinigungskonzentrat 2,5 Volumenprozent Wasser 97,5 Volumenprozent The cleaning fluid can have the following composition, for example: Cleaning concentrate 2.5 volume percent water 97.5 volume percent

Das Reinigungskonzentrat kann dabei bezogen auf dessen Gesamtmasse (Masseprozent)

  • 25 % Alkylbenzolsulfonat
  • 25 % Alkoholethoxylat
  • 3 % Fettsäurediethanolamid
  • 1 % Lösungsvermittler enthalten.
    • The cleaning concentrate can be based on its total mass (mass percentage)
  • 25% alkyl benzene sulfonate
  • 25% alcohol ethoxylate
  • 3% fatty acid diethanolamide
  • 1% solubilizer included.

    • Weiterhin kann das Reinigungskonzentrat Konservierungsmittel und Komplexierungsmittel enthalten, wobei die auf die Masse des Reinigungskonzentrates bezogenen prozentuale Anteile diese Bestandteile vorzugsweise kleiner als 1% sein können. Die sich ergebende Massendifferenz zwischen der Summe obiger Anteile und 100% kann aus Wasser bestehen. Der ph-Wert des Reinigungskonzentrates kann 7 betragen. The cleaning concentrate can also contain preservatives and Contain complexing agents, which depend on the mass of the Cleaning concentrate related percentages of these components can preferably be less than 1%. The resulting mass difference between the sum of the above proportions and 100% can consist of water. The pH value of the cleaning concentrate can be 7.

    BEZUGSZEICHENLISTEREFERENCE SIGN LIST

    11
    TrägerschichtCarrier layer
    22nd
    druckende Schichtprinting layer
    33rd
    nichtdruckende Schichtnon-printing layer
    44th
    BildpunktPixel
    5, 65, 6
    BebilderungssrückstandImaging residue
    77
    AndrückelementPressing element
    88th
    ReinigungstuchCleaning cloth
    99
    DruckformPrinting form
    1010th
    DruckformzylinderPrinting form cylinder
    1111
    druckmittelbeaufschlagbares Organorgan that can be pressurized
    1212th
    Reservoirreservoir
    1313
    ReinigungsfluidCleaning fluid
    1414
    Pumpepump
    1515
    BebilderungseinrichtungImaging device
    1616
    SteuerungseinrichtungControl device
    1717th
    DrehrichtungDirection of rotation

    Claims (32)

    1. Method for cleaning an imaged print forme having a non-printing layer based on silicone, with a cleaning element exerting a defined contact pressure on the print forme surface to be cleaned, with a relative movement taking place between the print forme and the cleaning element and with cleaning fluid being applied to the print forme surface to be cleaned,
      characterized
      in that the cleaning fluid, apart from water, contains a cleaning concentrate as a component, consisting of 1 to 30 percent by weight of an anionic surfactant and 1 to 30 percent by weight of a nonionic surfactant.
    2. Method according to Claim 1,
      characterized
      in that the cleaning concentrate contains alkyl-benzene sulfonate as an anionic surfactant.
    3. Method according to one of the preceding claims,
      characterized
      in that the cleaning concentrate contains alcoholic ethoxylate as a nonionic surfactant.
    4. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning concentrate contains 0.1 to 5 percent by weight of a lubricant component.
    5. Method according to Claim 4,
      characterized
      in that the cleaning concentrate contains carbamide (urea) as a lubricant component.
    6. Method according to Claim 4 or Claim 5,
      characterized
      in that the cleaning concentrate contains aliphatic acid diethanol amide as a lubricant component.
    7. Method according to one of the preceding claims,
      characterized
      in that the cleaning concentrate contains 1 to 25 percent by weight of a solubilizer.
    8. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning concentrate contains preservatives.
    9. Method according to Claim 8,
      characterized
      in that the cleaning concentrate contains 0.05 to 3 percent by weight of preservatives.
    10. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning fluid contains a disinfectant based on a sodium-silver chloride-complex.
    11. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning concentrate contains complexing agents.
    12. Method according to Claim 11,
      characterized
      in that the cleaning concentrate contains 0.1 to 2 percent by weight of hardness stabilizers.
    13. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning fluid contains 1 to 25 percent by volume of cleaning concentrate.
    14. Method according to Claim 13,
      characterized
      in that the cleaning fluid contains 1 to 2.5 percent by volume of cleaning concentrate.
    15. Method according to one or several of the preceding claims,
      characterized
      in that the cleaning fluid has a negative common logarithm of the hydrogen-ion concentration of a value between 5 and 8.
    16. Use of a cleaning fluid which, apart from water as a component, contains a cleaning concentrate containing 1 to 30 percent by weight of an anionic surfactant and
      1 to 30 percent by weight of a nonionic surfactant for cleaning an imaged print forme having a non-printing layer on a silicone base.
    17. Use of the cleaning fluid according to Claim 16, the cleaning concentrate of which contains alkyl-benzene sulfonate.
    18. Use of the cleaning fluid according to Claim 16 or 17, the cleaning concentrate of which contains alcoholic ethoxylate.
    19. Use of the cleaning fluid according to one or several of the preceding Claims 16 to 18, the cleaning concentrate of which contains 0.1 to 5 percent by weight of lubricant components.
    20. Use of the cleaning fluid according to Claim 19, the cleaning concentrate of which contains aliphatic acid diethanol amide as a lubricant component.
    21. Use of the cleaning fluid according to Claim 19 or 20, the cleaning concentrate of which contains carbamide (urea) as a lubricant component.
    22. Use of the cleaning fluid according to one or several of the Claims 16 to 21, the cleaning concentrate of which contains 1 to 25 percent by weight of solubilizer.
    23. Use of the cleaning fluid according to one or several of the Claims 16 to 22, the cleaning concentrate of which contains preservatives.
    24. Use of the cleaning fluid according to Claim 23, the cleaning concentrate of which contains 0.05 to 3 percent by weight of preservatives.
    25. Use of the cleaning fluid according to one or several of the Claims 16 to 24, the cleaning concentrate of which contains a disinfectant based on a sodium-silverchloride-complex.
    26. Use of the cleaning fluid according to one or several of the Claims 16 to 25, the cleaning concentrate of which contains complexing agents.
    27. Use of the cleaning fluid according to Claim 26, the cleaning concentrate of which contains 0.1 to 2 percent by weight of hardness stabilizers.
    28. Use of the cleaning fluid according to one or several of the Claims 16 to 27, said cleaning fluid containing 1 to 25 percent by volume of cleaning concentrate.
    29. Use of the cleaning fluid according to Claim 28, said cleaning fluid containing 1 to 2.5 percent by volume of cleaning concentrate.
    30. Use of the cleaning fluid according to one or several of the Claims 16 to 29, said cleaning fluid having a negative common logarithm of the hydrogen-ion concentration of a value between 5 and 8.
    31. Use of the cleaning fluid according to one or several of the Claims 16 to 30, said print forme having a non-printing layer consisting of silicone rubber.
    32. Use of the cleaning fluid according to one or several of the Claims 16 to 31, said print forme having a printing layer based on titanium.
    EP98109903A 1997-06-24 1998-05-29 Method for cleaning printing forms Expired - Lifetime EP0887204B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19726700 1997-06-24
    DE19726700 1997-06-24

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    EP0887204A3 EP0887204A3 (en) 1999-03-24
    EP0887204B1 true EP0887204B1 (en) 2001-04-04

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    EP (1) EP0887204B1 (en)
    JP (1) JPH1111037A (en)
    DE (2) DE19822441A1 (en)
    IL (1) IL125093A (en)

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    Also Published As

    Publication number Publication date
    EP0887204A2 (en) 1998-12-30
    DE59800586D1 (en) 2001-05-10
    IL125093A0 (en) 1999-01-26
    IL125093A (en) 2001-01-28
    JPH1111037A (en) 1999-01-19
    DE19822441A1 (en) 1999-01-28
    US6432211B1 (en) 2002-08-13
    EP0887204A3 (en) 1999-03-24

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