EP0099264A2 - Plaques d'impression - Google Patents

Plaques d'impression Download PDF

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Publication number
EP0099264A2
EP0099264A2 EP83304011A EP83304011A EP0099264A2 EP 0099264 A2 EP0099264 A2 EP 0099264A2 EP 83304011 A EP83304011 A EP 83304011A EP 83304011 A EP83304011 A EP 83304011A EP 0099264 A2 EP0099264 A2 EP 0099264A2
Authority
EP
European Patent Office
Prior art keywords
powder
substrate
melted
plate
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83304011A
Other languages
German (de)
English (en)
Other versions
EP0099264A3 (fr
Inventor
Stephen Bernard Doyle
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.)
Vinters Ltd
Original Assignee
Vickers PLC
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 Vickers PLC filed Critical Vickers PLC
Publication of EP0099264A2 publication Critical patent/EP0099264A2/fr
Publication of EP0099264A3 publication Critical patent/EP0099264A3/fr
Withdrawn legal-status Critical Current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
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/262—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
    • B41C2210/264—Polyesters; Polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
    • B41C2210/266—Polyurethanes; Polyureas

Definitions

  • This invention relates to printing plates and more particularly, but not exclusively, concerns lithographic printing plates.
  • lithographic printing plates in use at present are formed from radiation sensitive plates comprising a substrate, usually grained and anodised aluminium, coated with a layer of radiation-sensitive material which on exposure to radiation becomes either more or less soluble in a developer liquid.
  • a layer of radiation-sensitive material which on exposure to radiation becomes either more or less soluble in a developer liquid.
  • Such plates are exposed to ultra-violet light beneath a positive or negative transparency so that parts of the coating are struck by the light and parts are not.
  • the image-wise exposed coating is developed with a liquid developer which removes the more soluble parts of the coating to reveal the underlying surface of the substrate.
  • the resultant lithographic printing plate has non-image areas constituted by the revealed substrate surface and a printing image constituted by the less soluble parts of the coating which remained on the substrate after the development step.
  • a plate which comprises a substrate uniformly coated with a powder which is capable of being melted by the action of laser light and which has been image- wise exposed to laser light to melt the powder in selected areas, and leave non-melted powder in other areas.
  • a method of producing an image in printing plate manufacture which comprises providing a plate comprising a substrate having a uniform coating of a powder which is capable of being melted by the action of laser light; imagewise exposing the powder with laser light to melt the powder in selected areas; and removing the non-melted powder from the remaining areas of the substrate.
  • the image fixed on the substrate is used as a lithographic printing image.
  • the non-printing areas of the printing plate are constituted by the areas of the underlying substrate which are revealed when the powder is removed from said remaining areas.
  • Printing is effected in known manner by applying an aqueous solution to the plate.
  • the non-printing areas are hydrophilic and are wetted by the solution.
  • the resinous image is oleophilic and repels the water.
  • Greasy lithographic printing ink isthen applied to the plate. The ink is accepted by the image but is repelled by the wet-non-printing areas.
  • the inked image is then contacted with the medium to be printed, usually via the intermediary of an offset blanket, so that ink is transferred from the image onto the medium to obtain the desired copies.
  • the imaged and decoated plate prefferably be further heat treated to harden the image so as to improve printing life. If, however, the non-melted powder has not been fully removed from said remaining areas, the further heating step will cause any residual powder to adhere to the substrate. This residual powder will tend to accept ink and cause scumming during lithographic printing. This can be avoided by treating the substrate with a suitable protective layer forming material before it is coated with the powder.
  • Examples of materials which are suitable for this purpose are sodium dodecyl phenoxy benzene disulphonate; sodium salts of alkylated naphthalene sulphonic acids; the disodium salt of methylene dinaphthalene sulphonic acid; sodium dodecyl benzene sulphonate; and sodium salts of sulphonated alkyl diphenyl oxides.
  • the invention enables printing plates to be produced without using a liquid development step, it can if desired be utilised in the manufacture of lithographic printing plates by the conventional photomechanical technique.
  • the substrate carrying the laser melted image is used to form a transparency for use in exposing conventional radiation sensitive plates. This is particularly advantageous in, for example, the newspaper industry where a number of identical plates are required.
  • the reversed image constituted by the non-melted powder may be transferred onto a transparent substrate e.g. a film and the transferred powder heated e.g. by infra-red heating to fix the reversed image to the transparent substrate.
  • the transfer of the non-melted powder may be effected by contacting the coating, after the exposure to laser light, with a transparent substrate having an adhesive surface or which has been electrostatically charged.
  • the transparent substrate may be in the form of a film which is placed over the powder coating of the plate prior to exposure to the laser. The powder is then exposed to the laser light through the film. The melted powder tends to adhere to the film.
  • the plate on separation of the plate and the film, the plate carries an image constituted by the non-melted powder and the film carries an image constituted by the melted powder.
  • One of the images is a positive and the other is a negative.
  • the powder advantageously has a particle size of about 15 to 20 microns and is basically composed of a resin which has a melting-point sufficiently low to enable it to be readily melted by the laser but which is sufficiently hard at room temperature to remain particulate.
  • Suitable resins are polyacrylates, polyesters, polystyrene, polyurethanes, epoxide resins , and styrene-acrylate copolymers.
  • the powder may include a pigment such as carbon black and to improve the heat transfer the powder may include thermally conductive material such as iron oxide or graphite.
  • the powder may be sprayed onto the substrate and it is particularly preferred for the powder to be electrostatically charged before applying it to the substrate.
  • the powder may be applied by means of a magnetic brush in which case the powder must contain a magnetic component, such as iron filings.
  • an apparatus for producing an image in printing plate manufacture which comprises a means for applying a powder, which is capable of being melted by the action of laser light, to a substrate to form a uniform coating of the powder on the substrate; a laser for image-wise-exposing the coated substrate so as to melt the powder in those areas which are to form the image; and means for removing the powder from the remaining areas of the substrate.
  • the apparatus also includes means for heating the exposed and decoated plate to further harden the image areas.
  • the powder applying means comprises a device for electrostatically charging and spraying the powder on the substrate or a magnetic brush.
  • the apparatus includes a coating station 10, an exposure station 20, and a decoating station 30.
  • a means is provided to convey a substrate 1 from a storage stack 2 of such substrates along a path through the apparatus such that it is subjected to processing operations at stations 10,20 and 30.
  • Coating station 10 includes a powder spray head 11 fed from a reservoir 12 and incorporating a high voltage source 13.
  • the exposure station 20 includes a laser exposure unit.21 comprising a laser 22, the output beam of which is controlled by a digital modulator 23 and a scanning device 24 in accordance with a digital signal produced by an analogue/digital converter 25.
  • the laser exposure unit may vary in known ways and for further details reference may be made to "High Speed Laser Printing" by K.Starkweather in volume 4 of Laser Applications, edited by Joseph W. Goodman and Monte Ross and published by Academic Press.
  • the laser' is a YAG-Nd (yttrium-aluminium -garnet doped with neodymium) emitting at a wavelength of 1.06 micron.
  • other lasers such as a carbon dioxide laser or an argon ion laser may be used.
  • the decoating station 30 includes an air knife 31 and a powder recovery system 32 in communication with the reservoir 12.
  • a substrate 1 preferably formed of grained and anodised aluminium, is transferred from the stack 2 and conveyed to coating station 10.
  • Powder is blown from reservoir 12 to the sprayhead 11 where it is electrostatically charged by the voltage source 13 and sprayed onto the substrate to form a thin uniform powder coating on the substrate.
  • the coated substrate is then conveyed to the exposure station 20 where the coating is image-wise exposed to the laser light so that the powder is melted in the image areas and adheres to the substrate in those areas.
  • the image-wise exposed substrate is then conveyed to the decoating station 30 where it travels slowly under the air knife 31 which removes the powder from the areas which were not exposed to the laser light. This powder is sucked up by the recovery system 32 and returned to the reservoir 12.
  • the image-wise exposed and decoated substrate can then be used as a lithographic printing plate with the image constituting the printing image and the revealed surface of the substrate constituting the non-printing areas.
  • the apparatus may include means, such as infra-red emitters or a hot air oven, for heating the decoated plate to further harden the image.
  • Means for gumming the plate may also be incorporated.
  • the apparatus comprises a coating station 100, an exposure station 200 and a decoating station 300. As is shown, however, the substrate 1 is conveyed between the stations by being mounted on a drum 50.
  • the coating station 100 consists of a magnetic brush comprising a roller 101, containing a bar magnet 102, and rotating in a trough 103.
  • the trough 103 contains a mixture of the powder and iron filings.
  • the roller picks up the powder mixture and the powder is transferred to the substrate 1 because of a bias voltage applied between the roller and a connector plate 104 mounted in the drum 50.
  • the bias voltage is selected such that the powder is transferred to the substrate and the iron filings are retained on the roller.
  • the exposure station200 is identical to that shown in Figure 1.
  • the decoating station comprises a rotating brush which is movable from an in-operative position (as shown) to an operative position in which it is in contact with the drum 50.
  • a substrate is mounted on the drum and is then rotated past the magnetic brush roller 101 whereupon powder is transferred to the substrate.
  • the substrate then passes the exposure station 200 where the powder forming the image areas is fused to the substrate.
  • the brush at the decoating station 300 is retained in its inoperative position and the substrate is conveyed past the coating station where the majority of .the powder is removed.by reversing the bias voltage between the substrate and the roller.
  • the decoating station brush is moved into its operative position to remove any residual toner.
  • heating means may be incorporated.
  • gumming means may be incorporated.
  • a grained and anodised sheet of aluminium was processed by an apparatus as described and shown in Figure 1.
  • the powder had a particle size of 15 micron and was a combination of carbon black and a styrene-acrylate copolymer having a melting point of 80 deg.C.
  • the laser was a YAG-Nd laser having a power output of 10 watts.
  • the exposed and decoated plate was used as a lithographic printing plate and it produced many satisfactory copies.
  • Example 1 was repeated except that the substrate, before the powder coating step, was treated with sodium dodecyl di-sulphonated diphenyl oxide in the manner described in U.K.Patent No.1513368 and that the image wise exposed substrate was further heated using infra-red emitters after decoating. A substantial increase in the print-life of the resultant lithographic plate was obtained.
  • a grained and anodised sheet of aluminium was processed in the apparatus of Figure 2.
  • the powder had a particle size of 20 u and was composed of graphite and a polyurethane resin having a melting point of 100°C.
  • the powder was admixed with iron filings in a ratio of 5% powder to 95% iron filings.
  • the laser was an argon ion laser having a power output of 12 watts.
  • the image constituted by the melted powder was used as a lithographic printing image and good quality copies were obtained.
  • Example 1 was repeated except that after exposure a polyethylene terephthalate film which had been electrostatically charged by means of a corona discharge was pressed into contact with the powder layer and then stripped off. The non-melted areas of the powder coating adhered to the film. There was then obtained a positive image on the aluminium sheet and a negative image on the transparency.
  • the aluminium sheet could be used as a lithographic printing plate.
  • the transparency was subjected to infra-red heating to fix the powder thereon and could then be used to expose a radiation sensitive plate for conventional lithographic printing plate manufacture.
  • a grained and anodised sheet of aluminium was coated with powder as in Example 1. Before exposure to laser light, the powder was covered with a film of polyethylene terephthalate. The laser was arranged to expose non-image areas of the powder and, after the exposure step, the film was peel.ed off from the sheet. Those areas of the powder which had been melted by the laser had adhered to the film to form a negative transparency leaving a positive image consisting of non-melted powder on the sheet. The sheet was heated in an oven to fuse and fix the powder to the sheet to form a lithographic printing plate. By arranging the laser to expose image areas, a positive transparency could be produced for use in exposing a radiation sensitive plate in conventional lithographic printing plate manufacture.
EP83304011A 1982-07-09 1983-07-11 Plaques d'impression Withdrawn EP0099264A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8219940 1982-07-09
GB8219940 1982-07-09

Publications (2)

Publication Number Publication Date
EP0099264A2 true EP0099264A2 (fr) 1984-01-25
EP0099264A3 EP0099264A3 (fr) 1985-11-27

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ID=10531575

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Application Number Title Priority Date Filing Date
EP83304011A Withdrawn EP0099264A3 (fr) 1982-07-09 1983-07-11 Plaques d'impression

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EP (1) EP0099264A3 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0786337A2 (fr) 1996-01-24 1997-07-30 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé pour l'écriture sur plaques d'impressions effaçables
EP0974455A1 (fr) * 1998-07-16 2000-01-26 Agfa-Gevaert N.V. Procédé à sec de préparation d'un précurseur de plaque lithographique obtenue par voie thermique
EP1031415A1 (fr) * 1999-02-23 2000-08-30 Agfa-Gevaert N.V. Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique
EP1080884A1 (fr) * 1999-08-31 2001-03-07 Agfa-Gevaert N.V. Plaque lithographique sans traitement avec une nanostructure bien définie
EP1090750A2 (fr) * 1999-10-01 2001-04-11 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
US6244181B1 (en) 1998-07-16 2001-06-12 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
US6250225B1 (en) * 1998-07-16 2001-06-26 Agfa-Gevaert Thermal lithographic printing plate precursor with excellent shelf life
WO2002007986A1 (fr) * 2000-07-21 2002-01-31 Michael Zimmer Procede pour realiser une impression sur des objets, et poudre colorante
US6357353B1 (en) 1999-02-23 2002-03-19 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
US6550387B1 (en) 1999-08-31 2003-04-22 Agfa-Gevaert Processless thermal printing plate with well defined nanostructure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1444565A (fr) * 1964-09-09 1966-07-01 Dick Co Ab Procédé pour la préparation de clichés offset par thermographie
DE1271196B (de) * 1965-04-15 1968-06-27 Telefunken Patent Verfahren zur Aufzeichnung elektrischer Signale und dazu geeigneter Aufzeichnungstraeger
GB1157918A (en) * 1966-12-23 1969-07-09 Rca Corp Automatic Type Composition
DE2129926A1 (de) * 1970-06-16 1971-12-23 Fuji Photo Film Co Ltd Verfahren zur Markierung
FR2103839A5 (fr) * 1970-08-17 1972-04-14 Agfa Gevaert Ag
DE2512105A1 (de) * 1975-03-19 1976-09-30 Siemens Ag Vorrichtung zum aufzeichnen unter verwendung von normalpapier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1444565A (fr) * 1964-09-09 1966-07-01 Dick Co Ab Procédé pour la préparation de clichés offset par thermographie
DE1271196B (de) * 1965-04-15 1968-06-27 Telefunken Patent Verfahren zur Aufzeichnung elektrischer Signale und dazu geeigneter Aufzeichnungstraeger
GB1157918A (en) * 1966-12-23 1969-07-09 Rca Corp Automatic Type Composition
DE2129926A1 (de) * 1970-06-16 1971-12-23 Fuji Photo Film Co Ltd Verfahren zur Markierung
FR2103839A5 (fr) * 1970-08-17 1972-04-14 Agfa Gevaert Ag
DE2512105A1 (de) * 1975-03-19 1976-09-30 Siemens Ag Vorrichtung zum aufzeichnen unter verwendung von normalpapier

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRO CONF. RECORD, vol. 4, 24th April 1979, pages 1-6; R.M. LANDSMAN: "Laser platemaking" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 15, no. 1, June 1972, pages 213-214, New York, US; T.J. HARRIS et al.: "Thermal printer" *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19602328A1 (de) * 1996-01-24 1997-07-31 Roland Man Druckmasch Verfahren zum Bebildern einer löschbaren Druckform
EP0786337A3 (fr) * 1996-01-24 1998-02-11 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé pour l'écriture sur plaques d'impressions effaçables
EP0786337A2 (fr) 1996-01-24 1997-07-30 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé pour l'écriture sur plaques d'impressions effaçables
US6796237B2 (en) 1996-01-24 2004-09-28 Man Roland Druckmaschinen Ag Method for imaging and erasing an erasable printing form
EP0974455A1 (fr) * 1998-07-16 2000-01-26 Agfa-Gevaert N.V. Procédé à sec de préparation d'un précurseur de plaque lithographique obtenue par voie thermique
US6244181B1 (en) 1998-07-16 2001-06-12 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
US6250225B1 (en) * 1998-07-16 2001-06-26 Agfa-Gevaert Thermal lithographic printing plate precursor with excellent shelf life
US6357353B1 (en) 1999-02-23 2002-03-19 Agfa-Gevaert Dry method for preparing a thermal lithographic printing plate precursor
EP1031415A1 (fr) * 1999-02-23 2000-08-30 Agfa-Gevaert N.V. Procédé à sec pour la préparation de précurseur de plaque d'impression lithographique thermique
EP1080884A1 (fr) * 1999-08-31 2001-03-07 Agfa-Gevaert N.V. Plaque lithographique sans traitement avec une nanostructure bien définie
US6550387B1 (en) 1999-08-31 2003-04-22 Agfa-Gevaert Processless thermal printing plate with well defined nanostructure
EP1090750A2 (fr) * 1999-10-01 2001-04-11 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
EP1090750A3 (fr) * 1999-10-01 2001-08-22 Koenig & Bauer Aktiengesellschaft Procédé de traitement de plaques d'impression dans des machines d'impression
WO2002007986A1 (fr) * 2000-07-21 2002-01-31 Michael Zimmer Procede pour realiser une impression sur des objets, et poudre colorante

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