EP0363932A2 - Forme d'impression - Google Patents

Forme d'impression Download PDF

Info

Publication number
EP0363932A2
EP0363932A2 EP89118900A EP89118900A EP0363932A2 EP 0363932 A2 EP0363932 A2 EP 0363932A2 EP 89118900 A EP89118900 A EP 89118900A EP 89118900 A EP89118900 A EP 89118900A EP 0363932 A2 EP0363932 A2 EP 0363932A2
Authority
EP
European Patent Office
Prior art keywords
printing
printing form
toner
color
ferroelectric
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.)
Granted
Application number
EP89118900A
Other languages
German (de)
English (en)
Other versions
EP0363932A3 (fr
EP0363932B1 (fr
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/fr
Publication of EP0363932A3 publication Critical patent/EP0363932A3/fr
Application granted granted Critical
Publication of EP0363932B1 publication Critical patent/EP0363932B1/fr
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 printing form for duplicating an image template with which electrically charged color elements can be transferred to a printing material using an electrostatic field.
  • a printing form of this type is known from DE-AS 19 57 403, in which the printing form essentially consists of a dielectric to which electrodes are assigned.
  • 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.
  • the toner 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. H. the charge image can be generated again.
  • the invention has for its object to improve a printing form of the type mentioned in relation to the prior art in such a way that control of the printing form is required at least between individual printing processes of the same image.
  • the present invention is a printing method 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 two colors with differently charged particles are used, ie 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 both for the use of dry toners and for toners contained in a fountain solution as a carrier.
  • Another advantage of the invention results from the fact that the printing form according to the invention is also suitable for gravure printing.
  • the printing form can, according to one embodiment of the invention, 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 advantageously 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 number of polarized cells is varied in the case of gray tone formation in accordance with autotypical screening; only a binary polarization is necessary for this.
  • the cells that are supposed to take up color are polarized opposite to the color-free areas.
  • 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 electric 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 creates a control of the amount of ink or toner in the well.
  • the color the image-filled cell is then transferred to the printing material in accordance with conventional gravure printing.
  • 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 and with which the printing form surface is controlled in a matrix-like manner in accordance with an image template, with each pixel being polarized to a greater or lesser extent in accordance with the associated shade of gray or polarized in autotypical screening.
  • the charge image generated in this way can be combined with an ink application brush for a dry toner, with more or less ink being applied to the printing form surface at points.
  • a dry toner a toner (liquid toner) suspended in a carrier liquid can also be used.
  • the printing form according to the invention can also be used in such a way that the toner applied to the charge image using heat, pressure or chemical equipment reaction is fixed on the printing form.
  • the fixed toner serves as an imagewise hydrophobic area for the absorption of oil colors.
  • the toner-free areas are hydrophilic.
  • the printing form according to the invention has the further advantage over the known printing forms that the fixed color areas can be regenerated without renewed activation of the printing form. If the printing time is longer, it is possible that the fixed toner partly comes off, ie the hydrophobic areas have to be regenerated from time to time.
  • the printing form must be activated again in order to regenerate the color areas.
  • the printing form according to the invention is distinguished from the known devices in that a renewed activation for regeneration of the toner areas on the printing form is not necessary here either.
  • 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 alignment of the ferroelectric domains of the material 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 ferroelectrical 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 next to one another on the printing form 10 in turn offers the possibility of recording two different colors by charging one color positively and the other color negatively.
  • FIG. 2 shows the assignment of two toner containers 17 and 18, the one container 10 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 polarization of the ferroelectric layer can be done continuously with plus and minus, ie without neutral positions 16. Different shades of gray are either generated by different field strengths, with which the amount of color to be attracted can be varied, or by autotypical ones Screening with screen spots of different sizes, but polarized to saturation. Instead of a dry toner, charged toner particles suspended in a carrier liquid can also be used.
  • the rotogravure form consists of a substrate 30 made of a wear-resistant metal or ceramic.
  • the printing form contains pressure cups 31 arranged on the surface in a grid-like manner, the bottom of which each has a ferroelectric layer 32.
  • the individual ferroelectric layers 32 within the well 31 are actuated in an imagewise manner.
  • 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 nagative 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)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP89118900A 1988-10-14 1989-10-11 Forme d'impression Expired - Lifetime EP0363932B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6365159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118900A Expired - Lifetime EP0363932B1 (fr) 1988-10-14 1989-10-11 Forme d'impression

Country Status (4)

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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991018743A1 (fr) * 1990-05-31 1991-12-12 Ludwig Bartl Procede et dispositif d'impression d'informations variables
EP0458230A3 (en) * 1990-05-24 1993-08-25 Man Roland Druckmaschinen Ag Method and device for toning a ferroelectric material with a liquid film
EP1016519A3 (fr) * 1998-12-30 2001-03-14 Xerox Corporation Plaque d'impression avec mouillabilité réversible controllée par charge électrique
EP1260360A3 (fr) * 2001-05-23 2004-01-07 Heidelberger Druckmaschinen Aktiengesellschaft Méthode d'impression et dispositif
EP1995060A1 (fr) * 2007-05-22 2008-11-26 Ernst-Rudolf Dr. Weidlich Procédé destiné à influencer la capacité de maintien et/ou de dépose de la couleur de formes imprimées et dispositif d'impression
EP1990693A4 (fr) * 2006-03-02 2010-03-17 Toshiba Kk Appareil de nettoyage, procede de nettoyage, appareil de formation de motifs et procede de formation de motifs
EP3900934A1 (fr) * 2020-04-21 2021-10-27 Flooring Technologies Ltd. Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE10052853A1 (de) * 2000-10-25 2002-05-08 Anton Rodi Prägeform mit einer reliefartigen Oberflächenstruktur und Verfahren zu deren Herstellung

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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0458230A3 (en) * 1990-05-24 1993-08-25 Man Roland Druckmaschinen Ag Method and device for toning a ferroelectric material with a liquid film
WO1991018743A1 (fr) * 1990-05-31 1991-12-12 Ludwig Bartl Procede et dispositif d'impression d'informations variables
EP1016519A3 (fr) * 1998-12-30 2001-03-14 Xerox Corporation Plaque d'impression avec mouillabilité réversible controllée par charge électrique
EP1260360A3 (fr) * 2001-05-23 2004-01-07 Heidelberger Druckmaschinen Aktiengesellschaft Méthode d'impression et dispositif
US6935235B2 (en) 2001-05-23 2005-08-30 Heidelberger Druckmaschinen Ag Printing method and device
EP1990693A4 (fr) * 2006-03-02 2010-03-17 Toshiba Kk Appareil de nettoyage, procede de nettoyage, appareil de formation de motifs et procede de formation de motifs
EP1995060A1 (fr) * 2007-05-22 2008-11-26 Ernst-Rudolf Dr. Weidlich Procédé destiné à influencer la capacité de maintien et/ou de dépose de la couleur de formes imprimées et dispositif d'impression
EP3900934A1 (fr) * 2020-04-21 2021-10-27 Flooring Technologies Ltd. Dispositif de génération d'une impression sur une matière d'impression et procédé de génération d'une pluralité de cavités sur une forme d'impression dotée d'une matrice magnétique

Also Published As

Publication number Publication date
JPH02217871A (ja) 1990-08-30
JP2708066B2 (ja) 1998-02-04
EP0363932A3 (fr) 1990-11-22
CA2000343C (fr) 1996-10-29
CA2000343A1 (fr) 1990-04-14
DE58909754D1 (de) 1997-01-23
DE3835091C2 (fr) 1991-06-06
EP0363932B1 (fr) 1996-12-11
DE3835091A1 (de) 1990-04-19

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