EP0363932B1 - Druckform - Google Patents

Druckform Download PDF

Info

Publication number
EP0363932B1
EP0363932B1 EP89118900A EP89118900A EP0363932B1 EP 0363932 B1 EP0363932 B1 EP 0363932B1 EP 89118900 A EP89118900 A EP 89118900A EP 89118900 A EP89118900 A EP 89118900A EP 0363932 B1 EP0363932 B1 EP 0363932B1
Authority
EP
European Patent Office
Prior art keywords
printing
ferro
printing forme
toner
electric material
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
EP89118900A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0363932A2 (de
EP0363932A3 (de
Inventor
Hartmut Fuhrmann
Alfred Dr. Hirt
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 EP0363932A2 publication Critical patent/EP0363932A2/de
Publication of EP0363932A3 publication Critical patent/EP0363932A3/de
Application granted granted Critical
Publication of EP0363932B1 publication Critical patent/EP0363932B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1058—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by providing a magnetic pattern, a ferroelectric pattern or a semiconductive pattern, e.g. by electrophotography
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/006—Printing plates or foils; Materials therefor made entirely of inorganic materials other than natural stone or metals, e.g. ceramics, carbide materials, ferroelectric materials

Definitions

  • the invention relates to a method according to claim 1.
  • a method is already known from JP 63-220177 in which a ferroelectric printing form is used for printing.
  • the printing form has a flat surface, which is coated with a dry, powdery toner for printing.
  • the printing form is illustrated before the printing process. For this purpose, it is polarized positively and negatively according to the image to be printed. In a subsequent development step, positively charged areas of the printing form attract negatively charged toner particles. These are then printed on paper.
  • pyroelectric materials such as e.g. PLZT
  • a pyroelectric film is imaged by applying an electric field to it while at the same time maintaining it at a temperature above a dipole orientation temperature specific to the material. After the film has cooled to ambient temperature, it is immersed in a warm toner bath, whereby it is reheated so that it then has electrical charges on its surface which are capable of attracting charged toner particles and depositing them on the surface of the pyroelectric film . Finally, the toner particles are transferred to the paper.
  • the pyroelectric effect is used both in the production of the latent image and in its development, i. H. that a pyroelectric material is permanently polarized when heated and with the application of an electric field and that it is introduced for imaging in a warm or cold toner bath which contains charged toner particles.
  • a printing form with a dielectric or photoconductive layer is known from DE 19 57 403 B2. Electrodes are assigned to this layer for imagewise charging. A charge image is generated on the surface of the printing form by means of an ion source and an optically controllable optic, on which charged toner particles are recorded in accordance with the charge image. In contact with a printing material, the toner is transferred from the printing form to the printing material. Since the charge of the printing form is neutralized when the toner is absorbed, the printing form must be activated again before each printing, i.e. the charge image can be generated again.
  • GB 1 311 673 discloses a method for controlling toning or coloring in printing or copying processes, in which a printing form is used which has a multiplicity of small cups on its surface which receive the printing ink. These cells are similar to gravure cells.
  • the toner particles in the cells are electrically charged in accordance with the electrical field generated by a first electrode in the vicinity of the surface of the forme cylinder and, depending on the state of charge, are moved to the surface or to the bottom of the cells.
  • the electrically conductive surface of the printing cylinder which presses a printing material web against the forme cylinder, serves as the second electrode.
  • the charged particles are transferred to the printing material web or remain in the cells.
  • the loading process must be repeated after each printing or copying step.
  • the invention has for its object to provide a new printing method, which is characterized by the simplicity in its execution as well as by high print quality.
  • the present invention is a printing process using electrically charged toner particles. It has surprisingly been found that multi-color printing is possible in one operation.
  • the ferroelectric material can be polarized differently in very narrow areas, so that when using two colors with differently charged particles, ie that one color is positively charged and the other color is negatively charged, two colors can be applied simultaneously with one print that fewer runs are required for colored prints.
  • the printing form is suitable for a toner contained in a fountain solution as a carrier.
  • Another advantage of the invention results from the fact that the method according to the invention is also suitable for gravure printing.
  • the printing form to be used can consist of a wear-resistant substrate, the surface of which is intended for printing contains gravure cells, the bottoms of which are made of a ferroelectric material.
  • Such a printing form is connected to a control device with which the ferroelectric bottoms of the cells can be polarized to different extents according to the gray tone of the associated image point.
  • the cells are filled with a liquid toner or with a carrier liquid with charged toner particles.
  • the doctor blade or roller that then grazes over the wells acts on the electrical field acting on the polarized well base like a counterelectrode, so that a strong electric field arises in the space between the well bottom and the doctor blade, which, depending on the polarization, deposits toner particles on the well bottom or on the doctor blade .
  • the doctoring thus results in control of the amount of color or toner in the well.
  • the image-filled cup is then transferred to the printing material in accordance with conventional gravure printing technology.
  • An improvement in the color control by doctoring can be achieved if the doctor is electrically charged or brought to a correspondingly high electrical potential.
  • the printing form is provided with a ferroelectric layer on the surface that comes into contact with the printing material.
  • This printing form is assigned a control which is customary in electrostatic processes, with which the printing form surface is controlled in a matrix-like manner in accordance with an image template, each pixel being polarized to a greater or lesser extent in accordance with the associated gray tone.
  • the charge image thus generated can be combined with a color application brush for a toner, with more or less color being applied to the printing form surface at points.
  • a toner (liquid toner) suspended in a carrier liquid is used.
  • FIG. 1 shows a cylindrical printing form 10 with a hollow cylindrical carrier 11 made of electrically conductive material, the surface of which contains a layer 12 made of a ferroelectric material.
  • the ferroelectric layer 12 is controlled accordingly to generate a charge image 15. This can be done using the methods used to control dielectric layers.
  • the charge image consists of the sum of the negatively polarized, the positively polarized and the neutral halftone dots of the ferroelectric material 12.
  • the charges applied to the surface are firmly bound by the orientation of the ferroelectric domains during polarization and form a double layer of charge and counter charge that can only be separated by strong external fields or high temperature. If the surface comes into contact with electrically charged toner particles, the charge image is not neutralized or the charge flows away. The polarization of the ferroelectric material remains until the control unit 13 changes it to a different charge pattern.
  • the neutral areas 16 remain free of color toners, while the positive points can attract negatively charged toner particles and the negative points can attract positively charged particles.
  • the possibility of polarities of opposite characters standing closely side by side on the printing form 10 in turn offers the possibility of recording two different colors by one color being charged positively and the other color negatively.
  • FIG. 2 shows the assignment of two toner containers 17 and 18, the one container 17 containing, for example, positively charged yellow toner, while the second container 18 is filled with negatively charged red toner.
  • the toner When passing through the container areas, the toner is brought to the surface of the ferroelectric layer 12 with the aid of brushes 19 and 20, where the color particles adhere to the printing form 10 in accordance with the charge image 15 generated.
  • the absorbed color toner is transferred to a printing material 21 when it comes into contact with it and is fixed thereon by means of a heating source 22.
  • Two colors are applied simultaneously in a printing process, which means that in multi-color printing, only half as many printing processes are required for an image than with the conventional methods.
  • the rotogravure form consists of a substrate 30 made of a wear-resistant metal or ceramic.
  • the printing form contains pressure cups 31 arranged in a grid-like manner on the surface, the bottom of each of which has a ferroelectric layer 32.
  • the individual ferroelectric layers 32 within the well 31 are controlled imagewise.
  • the cups 31 are then filled with a liquid toner 33.
  • the toner particles therein are positively charged, for example, while the surface of the ferroelectric material 32 is more or less negatively polarized.
  • the excess liquid 33 is wiped off by means of a doctor blade 34.
  • the doctor blade 34 receives a negative charge, which makes it possible, depending on the intensity of the polarity of the ferroelectric material 32, to simultaneously pull corresponding amounts of particles out of the cells when crossing the cells 31. Thereafter, a quantity of color pigments remains in the cells, which correspond to the respective field strength of the assigned ferroelectric material 32. The remaining amount of color particles finally corresponds to the desired shade of gray. Finally, the amount of ink metered in this way is transferred to the printing material 35. Without renewed activation, the wells 31 are filled with colored liquid again.
  • the printing form according to the invention is suitable both for printing presses and for other duplicating devices, such as copiers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Printing Methods (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP89118900A 1988-10-14 1989-10-11 Druckform Expired - Lifetime EP0363932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3835091A DE3835091A1 (de) 1988-10-14 1988-10-14 Druckform
DE3835091 1988-10-14

Publications (3)

Publication Number Publication Date
EP0363932A2 EP0363932A2 (de) 1990-04-18
EP0363932A3 EP0363932A3 (de) 1990-11-22
EP0363932B1 true EP0363932B1 (de) 1996-12-11

Family

ID=6365159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118900A Expired - Lifetime EP0363932B1 (de) 1988-10-14 1989-10-11 Druckform

Country Status (4)

Country Link
EP (1) EP0363932B1 (enExample)
JP (1) JP2708066B2 (enExample)
CA (1) CA2000343C (enExample)
DE (2) DE3835091A1 (enExample)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213931A (en) * 1990-05-24 1993-05-25 Man Roland Druckmaschinen Ag Method and means for hydraulic meniscus toning of ferro electric materials
EP0572397A1 (de) * 1990-05-31 1993-12-08 BARTL, Ludwig Verfahren und vorrichtung zum drucken variabler informationen
DE4140996C2 (de) * 1991-12-12 2001-10-11 Fogra Forschungsgesellschaft D Elektrofotografisches Druckverfahren, Druckform sowie Verfahren zur Herstellung dieser Druckform
DE4328037A1 (de) 1993-08-20 1995-03-02 Roland Man Druckmasch Druckverfahren mit Ferroelektrika
DE19521187C2 (de) * 1995-06-10 1997-08-07 Fraunhofer Ges Forschung Verwendung eines ferroelektrischen keramischen Werkstoffs für die Informationsspeicherung bei elektrostatischen Druckverfahren
DE19601586C1 (de) * 1996-01-18 1997-07-10 Roland Man Druckmasch Verfahren zum Bebildern einer ferroelektrischen Druckform und Druckkopf
US6146798A (en) * 1998-12-30 2000-11-14 Xerox Corporation Printing plate with reversible charge-controlled wetting
DE10052853A1 (de) * 2000-10-25 2002-05-08 Anton Rodi Prägeform mit einer reliefartigen Oberflächenstruktur und Verfahren zu deren Herstellung
DE10125545A1 (de) * 2001-05-23 2002-11-28 Heidelberger Druckmasch Ag Druckverfahren und Vorrichtung
JPWO2007099848A1 (ja) * 2006-03-02 2009-07-16 株式会社東芝 クリーニング装置、クリーニング方法、パターン形成装置、およびパターン形成方法
EP1995060A1 (de) * 2007-05-22 2008-11-26 Ernst-Rudolf Dr. Weidlich Verfahren zum Beeinflussen der Farbhalte- und/oder Farbabgabefähigkeit von Druckformen und Druckvorrichtung
EP3900934B1 (de) * 2020-04-21 2022-05-18 Flooring Technologies Ltd. Vorrichtung zur erzeugung eines drucks auf einem bedruckstoff und verfahren zur erzeugung einer vielzahl von kavitäten auf einer druckform mit einem magnetraster

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1127830A (en) * 1965-10-24 1968-09-18 Continental Can Co Apparatus for intaglio electrostatic printing
CA1001704A (en) * 1968-11-15 1976-12-14 Thomas D. Kittredge Apparatus for aperture controlled electrostatic image reproduction or constitution
GB1311673A (en) * 1969-03-12 1973-03-28 Masson Scott Thrissell Eng Ltd Methods and apparatus for electrostatic printing or copying
US3765330A (en) * 1971-01-06 1973-10-16 Xerox Corp Xeroprinting employing letterpress surface covered with a layer of resistive material
US3801315A (en) * 1971-12-27 1974-04-02 Xerox Corp Gravure imaging system
US3951533A (en) * 1974-09-20 1976-04-20 Xerox Corporation Color image reproduction system
DE3633758A1 (de) * 1986-10-03 1988-04-07 Man Technologie Gmbh Druckmaschine
GB2198085B (en) * 1986-11-29 1991-02-13 Stc Plc Printing apparatus and process
JP2581059B2 (ja) * 1987-03-09 1997-02-12 ミノルタ株式会社 潜像書き込み方法およびそれを用いた画像形成方法
JPS63220259A (ja) * 1987-03-10 1988-09-13 Ricoh Co Ltd 画像形成方法

Also Published As

Publication number Publication date
CA2000343C (en) 1996-10-29
DE58909754D1 (de) 1997-01-23
EP0363932A2 (de) 1990-04-18
JPH02217871A (ja) 1990-08-30
DE3835091C2 (enExample) 1991-06-06
DE3835091A1 (de) 1990-04-19
JP2708066B2 (ja) 1998-02-04
EP0363932A3 (de) 1990-11-22
CA2000343A1 (en) 1990-04-14

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