EP0508273B1 - Dispositif d'impression pour imprimer en offset avec un toner - Google Patents

Dispositif d'impression pour imprimer en offset avec un toner Download PDF

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Publication number
EP0508273B1
EP0508273B1 EP92105504A EP92105504A EP0508273B1 EP 0508273 B1 EP0508273 B1 EP 0508273B1 EP 92105504 A EP92105504 A EP 92105504A EP 92105504 A EP92105504 A EP 92105504A EP 0508273 B1 EP0508273 B1 EP 0508273B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
transfer
printing
printing device
transfer cylinder
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
EP92105504A
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German (de)
English (en)
Other versions
EP0508273A1 (fr
Inventor
Luis Lima-Marques
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.)
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Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0508273A1 publication Critical patent/EP0508273A1/fr
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Anticipated expiration legal-status Critical
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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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/42—Printing without contact between forme and surface to be printed, e.g. by using electrostatic fields
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition

Definitions

  • Electrostatic printing methods are particularly useful when only a fairly small number of prints are required, or when the image to be printed changes frequently, or when a part of the image to be printed has to be replaced at regular intervals.
  • Powdered dry toners have a number of disadvantages for use in a printing process.
  • the main disadvantage is dust formation; very small toner particles very easily leave the so-called developer and settle on surfaces inside and outside the printing device. On the one hand, they cause faults within the printing device and, on the other hand, environmental problems outside the printing device. This disadvantage is particularly significant when printing devices are operated at high speed. This leads to high maintenance costs for the printing device; loss of dry toner also incurs costs.
  • a major disadvantage is the so-called liquid separation.
  • a certain amount of the solvent, ie the carrier of the toner is deposited on the paper by a transfer cylinder that transfers the toner and is mechanically moved. The solvent then evaporates, polluting the air and significantly increasing production costs.
  • Another disadvantage of liquid toners is the tendency for color particles to deposit on non-colored or background surfaces, which leads to a general weakening of the color effect on the copy, which is usually referred to as background fog.
  • the print medium is a ferroelectric transmission medium with a more or less permanent latent image that has been embossed on or above its surface by means of internal polarization.
  • the toner dissolved in the solvent is accumulated only on those areas of the transfer medium which constitute an image without the above-mentioned background fog, so that the solvent immission can be reduced considerably.
  • Such a device is described in US Application No. US-A-5213931, which is incorporated herein by reference.
  • a printing method with toner transfer is already known from JP 58-44472 (A), in which toner is transferred from a forme cylinder through a gap to a transfer cylinder and from there onto a printing material web, while a direct voltage is applied to the printing cylinder. In addition, however, an AC voltage is still present on the transfer cylinder.
  • the printing device for offset printing with a toner has a forme cylinder, a transfer cylinder and a printing cylinder, the forme cylinder being covered on its outer surface with a transfer medium, which in turn is one of them has a toner image depicting a printing image on its outer surface, the transfer cylinder being at a spatial distance from the forme cylinder, a printing material web being pressed against the transfer cylinder by the printing cylinder and running between the transfer cylinder and the printing cylinder, and a direct voltage being applied to the printing cylinder which causes the transfer of the toner deposit from the forme cylinder via the transfer cylinder to the printing material web by influence.
  • the transmission medium is preferably a ferroelectric.
  • the transfer cylinder preferably has an elastic surface made of a semiconducting or insulating material.
  • the transfer cylinder can also be a metal cylinder.
  • the present invention relates to a printing device for the offset transfer of a toner, which covers the image surfaces of the surface of a transfer medium, which in turn is located on the outer surface of a forme cylinder.
  • the printing process therefore consists essentially of the fact that a forme cylinder containing the transfer medium rotates, the toner being deposited on the surface of the transfer medium, that an offset cylinder which does not directly touch the forme cylinder also rotates and at the same speed, whereby the transfer cylinder touches a printing material web which moves past the transfer cylinder essentially at a distance from the circumference of the transfer cylinder from the forme cylinder, the printing material web being held in contact with the transfer cylinder by a printing cylinder.
  • the printing cylinder presses on that side of the printing material web that is not printed.
  • a direct voltage is applied to the printing cylinder, which causes the toner deposit to be transferred successively from the surface of the transfer medium to the forme cylinder to the surface of the transfer cylinder and finally from this to the surface of the printing material web.
  • the transmission medium is designed as the outer surface of a forme cylinder, which is in spatial proximity to a toner dispenser, which is also in the form of a cylinder.
  • the transfer medium does not touch the toner dispenser.
  • the transfer cylinder is also adjacent to the transfer medium, without touching it, on the side of the transfer medium facing away from the toner dispenser.
  • the outer surface of the transfer cylinder is preferably coated with an elastic layer made of a semiconducting or insulating material, for example made of a synthetic rubber or the like.
  • the preferred distance between the transfer cylinder and the forme cylinder is of the order of 0.1 mm; however, it can also be chosen to be larger or smaller depending on the amount of liquid that the toner deposition on the surface of the transfer medium entails.
  • the impression cylinder is positioned on the side of the transfer cylinder that is more or less opposite the position that the forme cylinder assumes.
  • the printing material is moved in the form of a printing material web between the printing cylinder and the transfer cylinder and is pressed between them.
  • a DC voltage of approximately 2 kV is applied to the impression cylinder. Due to influenza, a voltage of the order of 1 kV is present on the surface of the transfer cylinder. This, in turn, is large enough to cause transfer of toner particles due to the influence from the surface of the forme cylinder to the surface of the transfer cylinder, even when there is no surface contact between the forme cylinder and the transfer cylinder. Liquid in which the toner particles are contained and which is carried along by the surface of the transfer medium on the forme cylinder is not transferred to the transfer cylinder, although a sufficient amount of liquid remains in the toner deposit to ensure the transfer. The higher voltage on the printing cylinder causes the electrostatic transfer of the toner deposit from the transfer cylinder to the surface of the substrate. Non-image areas remain completely dry on the surface of the printing material, while the amount of liquid contained in the toner deposit is no longer measurable.
  • Another advantage of this device is that it is no longer necessary to apply a voltage to transfer the toner particles to apply any cylinder which is in contact with the surface of the transfer medium containing the image to be printed on the forme cylinder. In this way, distortion of the latent image on the transfer medium is avoided.
  • a further advantageous embodiment of the invention is that the semiconducting or insulating layer which covers the transfer cylinder is additionally charged by a corona discharge, while the toner deposit on the forme cylinder is charged in the opposite direction.
  • This additional charge in addition to the charge caused by the influence, facilitates the transfer of toner particles from the image areas on the surface of the transfer medium to the surface of the transfer cylinder.
  • the outer surface of a forme cylinder 1 (FIG. 1) is covered by a transmission medium 2.
  • the forme cylinder 1 rotates in the direction indicated by the arrow.
  • the transfer medium 2 carries a toner deposit 3 representing an image to be printed on its outer surface.
  • a printing material web 6 touches the transfer cylinder 4 and is pressed against it by the pressure exerted by a printing cylinder 7.
  • the pressure cylinder 7 preferably has an elastic, semiconducting or insulating layer 8 on its surface.
  • To the Printing cylinder 7 is at a DC voltage, which generates a lower voltage due to influence on the surface of the transfer cylinder 4.
  • the rotation of the printing cylinder 7 of the transfer cylinder 4 and the forme cylinder 1, while a DC voltage is present thereon due to the influence, causes a transfer of the toner deposit 3 to the transfer cylinder 4 across an air gap between the forme cylinder 1 and the transfer cylinder 4 and leads to toner deposition 9 on the outer surface of the transfer cylinder 4.
  • the final image is generated thereon by a toner deposit 10.
  • a transfer cylinder 11 (FIG. 2) is provided instead of the transfer cylinder 4. It consists of a cylindrical insulating support 12 which is covered by a metallic hollow cylinder 14. This is connected to the first potential via a resistor 13. The transfer cylinder 11 rotates in the direction indicated by the arrow.
  • the transfer medium 2 is a ferroelectric from which the toner is transferred to the printing material web 6. This is done according to methods known per se for the electrostatic transfer of a toner onto a printing material, in particular paper.
  • the layer 5 of the transfer cylinder 4 consists of a more or less elastic semiconductor material, such as a polyurethane coating. This is for example 3 mm thick and characterized by a specific surface resistance of 1.7 x 1011 ⁇ , as well as by a specific volume resistance of 4.7 x 1010 ⁇ x cm and a Duro hardness of 49 Shore A.
  • the printing speed is, for example 0.5 m / s, while the distance between the forme cylinder 1 and the transfer cylinder 4th Is 0.1 mm.
  • a negative voltage of 2 kV is preferably applied to the pressure cylinder 7.
  • a negative voltage of 1 kV is then present at layer 5.
  • the negative voltage applied to the printing cylinder 7 is advantageously increased to 4 kV, so that a negative voltage of 1.5 kV is applied to the surface of the layer 5 of the transfer cylinder 4.
  • a polyurethane layer with a specific surface resistance of 2 x 1012 ⁇ and with a specific volume resistance of 8 x 1010 ⁇ x cm and a Duro hardness of 80 Shore A can also be applied to the transfer cylinder 4 .
  • a corona electrode can additionally be attached at a distance of 15 mm from the transfer cylinder 4.
  • This has, for example, a diameter of 50 »m and is charged with a voltage of 4 kV; in contrast, the toner deposit 3 on the forme cylinder 1 has an opposite charge. In this way, an even easier transfer of the toner from the forme cylinder 1 via the transfer cylinder 4 to the printing material web 6 can be effected.
  • the surface topography of the transfer cylinder 4 has an influence on the quality of the print image that appears on the printing material web 6.
  • the surface of the transfer cylinder 4 should preferably have a height fluctuation of less than 2 »m, although an average square error of 10» m can also be tolerated.
  • the specific surface resistance of layer 5 is approximately 10 11 ⁇ , the specific volume resistance is in the order of 109 to 10 11 ⁇ x cm.
  • the resistance 13, via which the metallic hollow cylinder 14 is grounded, is 1 G ⁇ .
  • the printing speed is advantageously 0.5 m / s with a distance of 0.1 mm between the forme cylinder 1 and the transfer cylinder 11.
  • a sufficient good print quality is achieved when a negative voltage of 1.5 kV is applied to the printing cylinder 7. This causes a negative voltage of 1.0 kV on the transfer cylinder 11.
  • the printing speed is 1 m / s, a negative voltage of 1.1 kV is measured on the transfer cylinder 11.
  • a negative voltage of 1.15 kV is measured on the transfer cylinder 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Claims (12)

  1. Dispositif d'impression pour réaliser l'impression offset avec un toner et qui comporte un cylindre porte-clichés (1), un cylindre de transfert (4) et un cylindre d'impression (7), le cylindre porte-clichés (1) étant recouvert, au niveau de sa surface enveloppe, par un support de transfert (2), qui possède pour sa part une couche de toner (3) représentant l'image à imprimer, sur sa surface extérieure, et dans lequel le cylindre de transfert (4) est situé à une certaine distance spatiale du cylindre porte-clichés (1), et dans lequel une bande d'impression (6) est repoussée par le cylindre d'impression (7) contre le cylindre de transfert (4) et s'étend entre le cylindre de transfert (4) et le cylindre d'impression (7), et dans lequel au cylindre d'impression (7) est appliquée une tension continue, au moyen de laquelle peut être produite par influence, sur la surface du cylindre de transfert (4), une tension continue plus faible, qui pour sa part peut provoquer un transfert de la couche de toner (9) du cylindre porte-clichés (1) au cylindre de transfert (4), et de ce dernier à la bande d'impression (6).
  2. Dispositif d'impression selon la revendication 1, caractérisé en ce que le support de transmission (2) est un matériau ferroélectrique.
  3. Dispositif d'impression selon la revendication 1 ou 2, caractérisé en ce que le cylindre porte-clichés (1) et le cylindre d'impression (7) sont situés sur des côtés réciproquement opposés du cylindre de transfert (4).
  4. Dispositif d'impression selon l'une des revendications précédentes, caractérisé en ce que la distance spatiale entre le cylindre porte-clichés (1) et le cylindre de transfert (4) est comprise entre 0,05 et 0,15 mm.
  5. Dispositif d'impression selon l'une des revendications précédentes, caractérisé par le fait qu'une tension continue négative comprise entre 1 kV et 4 kV est appliquée au cylindre d'impression (7).
  6. Dispositif d'impression selon l'une des revendications précédentes, caractérisé par le fait que le cylindre de transfert (4) comporte, sur sa surface enveloppe, une couche (5) formée d'un matériau semiconducteur ou isolant.
  7. Dispositif d'impression selon la revendication 6, caractérisé en ce que la couche (5) contient du polyuréthane.
  8. Dispositif d'impression selon la revendication 6 ou 7, caractérisé en ce que la couche (5) possède une résistance de la surface spécifique dans la gamme comprise entre 1,7 x 10¹¹ Ω et 2 x 10¹² Ω ainsi qu'une résistance de volume spécifique située dans la gamme comprise entre 1 x 10¹⁰ Ω x cm et 8 x 10¹⁰ Ω x cm.
  9. Dispositif d'impression selon l'une des revendications 6 à 8, caractérisé par le fait que la couche (5) possède une dureté mesurée au duromètre dans la gamme comprise entre 49 et 85 Shore A.
  10. Dispositif d'impression selon l'une des revendications précédentes, caractérisé en ce que le cylindre de transfert (4) est chargé en supplément par la décharge d'une électrode à effet couronne, qui est située à proximité du cylindre de transfert (4).
  11. Dispositif d'impression selon l'une des revendications précédentes, caractérisé en ce que le cylindre de transfert (11) est constitué essentiellement par un support intérieur isolant (12), qui est recouvert, au niveau de sa surface enveloppe, par un cylindre creux métallique conducteur (14).
  12. Dispositif d'impression selon la revendication 11, caractérisé en ce que le cylindre creux (14) est placé au potentiel de terre par l'intermédiaire d'une résistance (13).
EP92105504A 1991-04-10 1992-03-31 Dispositif d'impression pour imprimer en offset avec un toner Expired - Lifetime EP0508273B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK556091 1991-04-10
AU5560/91 1991-04-10

Publications (2)

Publication Number Publication Date
EP0508273A1 EP0508273A1 (fr) 1992-10-14
EP0508273B1 true EP0508273B1 (fr) 1995-06-14

Family

ID=3775333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105504A Expired - Lifetime EP0508273B1 (fr) 1991-04-10 1992-03-31 Dispositif d'impression pour imprimer en offset avec un toner

Country Status (3)

Country Link
US (1) US5354641A (fr)
EP (1) EP0508273B1 (fr)
DE (1) DE59202488D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204281A1 (de) * 2002-02-02 2003-08-07 Hueck Folien Gmbh & Co Kg Bedruckte Materialbahnen, insbesondere mit fluoreszierendem Material bedruckte Materialbahnen

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0616948A (ja) * 1992-04-16 1994-01-25 Mearthane Prod Corp 導電性及び半導電性ポリマー材
US5452063A (en) * 1994-01-03 1995-09-19 Xerox Corporation Intermediate transfer with high relative humidity papers
US5499085A (en) * 1995-06-06 1996-03-12 Moore Business Forms, Inc. Trailing edge dust control
DE19703559B4 (de) * 1997-01-31 2007-06-06 Eastman Kodak Co. Verfahren und Vorrichtung zum Auftragen von Toner auf ein Substrat mittels Druckmaschine
AT407859B (de) * 1999-11-18 2001-07-25 Weber Casper Urban Flachdruckverfahren
US6451438B1 (en) 2000-11-30 2002-09-17 Mearthane Products Corporation Copolymerization of reactive silicone and urethane precursors for use in conductive, soft urethane rollers
US8222341B2 (en) 2009-03-17 2012-07-17 Mearthane Products Corporation Semi-conductive silicone polymers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253730B (de) * 1964-06-05 1967-11-09 Agfa Ag Verfahren zum ganzen oder auszugsweisen Abdruck einer Druckform und Rotationsvervielfaelfaeltiger zur Durchfuehrung des Verfahrens
DE3911932A1 (de) * 1989-04-12 1990-10-25 Krause Biagosch Gmbh Druckmaschine
US5213931A (en) * 1990-05-24 1993-05-25 Man Roland Druckmaschinen Ag Method and means for hydraulic meniscus toning of ferro electric materials

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. Vogel, Physik, Springer-Verlag, Berlin, Heidelberg, New-York 1974, 11. Auflage, Seite 305, 306 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204281A1 (de) * 2002-02-02 2003-08-07 Hueck Folien Gmbh & Co Kg Bedruckte Materialbahnen, insbesondere mit fluoreszierendem Material bedruckte Materialbahnen
DE10204281B4 (de) * 2002-02-02 2008-02-07 Constantia Hueck Folien Gmbh & Co. Kg Bedruckte Materialbahnen, insbesondere mit fluoreszierendem Material bedruckte Materialbahnen, deren Herstellung und deren Verwendung

Also Published As

Publication number Publication date
EP0508273A1 (fr) 1992-10-14
DE59202488D1 (de) 1995-07-20
US5354641A (en) 1994-10-11

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