[go: up one dir, main page]

EP0200488A2 - Matériel pour l'enregistrement pour appareil d'enregistrement tel que machines pour impression - Google Patents

Matériel pour l'enregistrement pour appareil d'enregistrement tel que machines pour impression Download PDF

Info

Publication number
EP0200488A2
EP0200488A2 EP86303123A EP86303123A EP0200488A2 EP 0200488 A2 EP0200488 A2 EP 0200488A2 EP 86303123 A EP86303123 A EP 86303123A EP 86303123 A EP86303123 A EP 86303123A EP 0200488 A2 EP0200488 A2 EP 0200488A2
Authority
EP
European Patent Office
Prior art keywords
recording medium
polymer
sensitive layer
layer
printing
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Withdrawn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
EP86303123A
Other languages
German (de)
English (en)
Other versions
EP0200488A3 (fr
Inventor
Keith Samuel Pennington
Mitchell Simmons Cohen
Krishna Gandhi Sachdev
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0200488A2 publication Critical patent/EP0200488A2/fr
Publication of EP0200488A3 publication Critical patent/EP0200488A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • B41C1/1041—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern

Definitions

  • the present invention relates to a recording medium for use in a recording apparatus, for example a printing apparatus, and in particular to the production of offset masters and negatives for use in printing processes.
  • resistive ribbon thermal transfer printing and eiectroerosion printing are known in the art for providing high resolution, good quality printing, especially of the type that is used in computer terminals and typewriters.
  • Resistive ribbon thermal transfer printing is a type of thermal transfer printing in which a thin ribbon is used.
  • the ribbon generally comprises either three or four layers, Including a support layer, a layer of fusible ink that is brought into contact with the receiving medium (such as paper), and a layer of electrically resistive material.
  • the resistive layer is thick enough to be the support layer, so that a separate support layer is not needed.
  • a thin, electrically conductive layer is also optionally provided to serve as a current return.
  • the layer of ink is brought into contact with the receiving surface.
  • the ribbon is also contacted by an electrical power supply and selectively contacted by a thin printing stylus at those points opposite the receiving medium where it is desired to print.
  • current is applied via the thin printing stylus, it travels through the resistive layer and causes localised resistive heating, which in turn melts a small volume of ink in the fusible ink layer. This melted ink is then transferred to the receiving medium to produce printing.
  • Resistive ribbon thermal transfer printing is described by way of example in US-A-3,744,611; A-4,309,117; A-4,400,100; A-4,491,431 and A-4,491,432.
  • the resistive layer is commonly a carbon or graphite-filled polymer, such as polycarbonate.
  • the thin current return layer is a metal, such as Al.
  • the thermally fusible inks are various resins having a colourant therein, and typically melt at about 100 degrees C. Printing currents of approximately 20-30 mA are used in the present, commercially available printers.
  • Electroerosion printing is also well known in the art, and is described by way of example in US-A-3,786,518; A-3,861,952; A-4,339,758 and A-4,086,853. Electroerosion printing is known as a technique which is suitable to make direct offset masters and direct negatives.
  • the elec- toerosion recording medium comprises a support layer and a thin electrically conductive layer.
  • the support layer can be, for example, paper, polyesters such as Mylar (Registered Trade Mark), etc.
  • the thin conductive layer is a metal, such as AI.
  • portions of the thin AI layer are removed by an electric arc.
  • a printing head comprising multiple styli, typically tungsten wire styli of diameters 0.3-0.5 mil - (0.3 -0.5 X 10-3 inch), is swept across the electroerosion medium while maintaining good electrical contact between the styli tips and the aluminium layer.
  • styli typically tungsten wire styli of diameters 0.3-0.5 mil - (0.3 -0.5 X 10-3 inch)
  • a pulse is applied to the appropriate stylus at the correct time, resulting in an arc between the energised stylus and the aluminium layer. This arc is hot enough to cause local removal of the aluminium by disintegration, e.g., vaporisation.
  • the base layer is a hard layer consisting of hard particles embedded in a suitable binder, such as silica in a cross-linked cellulosic binder.
  • the overlay layer is typically a lubricating, protective overlayer comprising of a polymer including a solid lubricant, such as graphite in a cellulosic binder.
  • a direct negative or a direct offset master can be formed.
  • a direct negative can be formed from a transparent polymer support layer and a thin aluminium layer directly deposited on the support layer.
  • the AI layer is patterned with holes. Since the Al layer is reflective to light while the supporting substrate is transparent, the electroerosion writing process has produced the required light opaque and light transparent regions needed to make a negative.
  • the electroeroded negative can be used in a plate-making machine of the type used to make a "master.” such as that used in offset photofithog- raphy. The master would be made by contact printing using the electroeroded negative.
  • the electroerosion medium typically comprises the support layer, a base layer which is hydrophobic, an AI layer, and an optional overlay layer.
  • the AI layer has been written on by being electroeroded and the overlay layer has been removed, regions of the AI layer - (unwritten areas) and the base layer (written eroded areas) will be exposed. Since the AI layer is hydrophilic, the unwritten areas having AI will attract water but will repel organic inks. The written areas of the recording medium, being formed by the hydrophobic base layer, will repel water but will accept organic based inks.
  • a direct master is thereby produced, since the information to be printed has been successfully mapped onto the master in terms of surface affinity to water and ink.
  • the substrate-AI layer combination could itself be used for direct negative and direct master applications.
  • a clear hydrophobic polymer sheet typically polyester, can be used as the substrate. Since this is transparent to light while the AI is reflective, a direct negative would be obtained. Also, since the AI is hydrophilic and the polyester substrate is hydrophobic, a direct master would also be created in principle.
  • Printing techniques such as facsimile printing, often incorporate dyes whose colour can be changed in localities where a discharge of current occurs.
  • An example of this is described in US-A-3,113,512, wherein electrically-induced colour changes in a sheet are grouped so as to reproduce the original image scanned by a sending device.
  • the object of the present invention is to provide an improved recording medium for use in a recording apparatus, for example a printing apparatus.
  • the present invention relates to a recording medium for use in a recording apparatus comprising a substrate, a sensitive layer and an electrically conducting layer.
  • the invention is characterised in that the sensitive layer is formed from a material which is hydrophilic at temperatures below about 150 degrees C and is capable of having its hydrophilicity locally reduced by the passage of electrical current therethrough.
  • a multi-stylus printing head of the type used in resistive ribbon printing or electroerosion printing, is used to provide localised currents in a resistive layer of a recording medium.
  • the recording medium comprises the resistive layer, a thin conductive layer such as metal, and a supporting substrate. If the thin conductive layer is to be transparent InSnO can be used, together with a substrate which is also light transparent.
  • the regions of the resistive layer through which high density electrical currents pass from the recording styli undergo chemical changes, changing the ink-retention properties and/or colour of these regions.
  • a hydrophilic resistive layer can be converted to a hydrophobic state in localised areas by resistive heating due to the passage of electrical current of high density therethrough, which will make these regions ink attractive (oleophilic). The remaining portions of the resistive layer will retain their hydrophilic character, so that regions of ink retention and repulsion will be formed. This provides a master for use in a printing process.
  • the resistive layer is typically a polymer layer which can be made to have a resistivity similar in magnitude to the resitivity found in the resistive layers of resistive printing ribbons.
  • the thickness of the resistive layer depends upon the life desired for the master and on the resolution to be obtained. Typically the resistive layer is about 0.5-2 mils (0.5 -2 x 10- 3 inch) in thickness.lf the recording medium is to be used only for prinfing, rather than as a printing master, the thickness of the resistive layer can be made much less, for example, 5 microns and less.
  • the attainable resolution depends upon the recording styli diameter and the thickness of the resistive layer. Resolution and printing quality equivalent to or better than that of resistive ribbon printing and electroerosion printing are readily available using this technique. Additionally, the current and power requirements will be less than those in conventional resistive ribbon printing, and will be typically 14-20 mA, at 10-12 V.
  • the printing apparatus to be described uses high density electrical currents to produce intense resistive heating to locally change the chemical behaviour of a resistive layer in a recording medium.
  • the ink retention properties and/or colour of the resistive layer can be locally changed so that the resistive layer can be used for printing and for the production of negatives and masters, without requiring wet chemical processing, electroerosion of a thin metal layer, or the necessity for a fusible ink layer.
  • a recording medium 10 comprises a substrate or support layer 12, a thin electrically conductive layer 14, and a resistive layer 16.
  • a multi-stylus head of the type used in either resistive ribbon printing or electroerosion printing is provided.
  • This type of head is well known in the art and comprises a plurality of printing styli (one of which is shown at 18) and a large contact (ground) electrode 20.
  • electrical currents represented by the arrows 22 will flow from the styli and through the resistive layer 16 and will return to the ground electrode 20 via the conductive layer 14, as represented by arrows 24.
  • region 26 of the resistive layer 16 will have its properties and/or colour changed.
  • region 26 can be made oleophilic by the passage of high density electrical current therethrough.
  • the apparatus of Figure 1 is very similar to that used in resistive ribbon printing, except that the fusible ink layer is missing.
  • the resistive layer 16 has a resistivity similar to that of the resistive layers in resistive printing ribbons, typically from about 200 to 1,200 ohms/square.
  • the thickness of the resistive layer 16 depends upon the required printing resolution and plate life of the recording medium 10, when it is used as a master. For printing uses where the ink retention properties of the resistive layer do not have to be changed, i.e. where it is not to be used as a master, the resistive layer can be less than 5 microns thick. When the recording medium 10 has its ink retention properties changed and is to be used as a plate in offset lithography, the thickness of layer 16 is generally about 0.2-2 mils (0.2 -2 x 10- 3 inch).
  • the conductive layer 14 is formed from any type of metal, including Al, Ni, Cr, Cu, stainless steel, etc. Its thickness is generally about 1,000 angstroms.
  • the substrate or support layer 12 can be any of the generally used materials, including Mylar - (Registered Trade Mark) (polyethylene teraph- thalate), Teflon (Registered Trade Mark) (polytetrafluoroethylene), polyesters, etc. Its thickness is usually about 1 micron.
  • Mylar - (Registered Trade Mark) (polyethylene teraph- thalate), Teflon (Registered Trade Mark) (polytetrafluoroethylene), polyesters, etc. Its thickness is usually about 1 micron.
  • the resistive layer 16 is formed from a polymer having limited conductivity, and is initially hydrophilic. When the temperature of the polymer is locally raised to a sufficient value in excess of about 150 degrees C, it will undergo a chemical change and will be converted to a hydrophobic material. Resistive polymers suitable for use as layer 16 are those which will undergo no chemical or physical changes at temperatures below approximately 150 degrees C. Preferably, no chemical changes will occur until the temperatures are in excess of 250 degrees C, and usually in the range 300-400 degrees C. This means that these materials will be very stable under ordinary ambient conditions, and will experience no colour changes and/or structural or chemical changes even upon storage in hostile environments for long periods of time.
  • Suitable resistive materials for layer 16 is a polymer binder having electrically conductive materials therein, such as ZnO, Ti0 2 , CdS or graphite.
  • electrically conductive materials such as ZnO, Ti0 2 , CdS or graphite.
  • a built-in mechanism for visible change can also be included in the resistive layer.
  • the binder has structural features that allow thermally-induced dehydration and reduced hydrophilicity in the image areas when an electrical current pulse is applied to these areas.
  • polyamic acid which, upon the application of an electrical pulse, will undergo thermal ring closure to a polyimide precursor.
  • the resistive layer 16 can be formed as a coating applied to the thin metal layer 14 from polar solvents such as diglyme, glyme, THF - (tetrahydrofuran), or NMP (n-metal pyrrodlidone). The coatings are then dried at about 100 degrees 'C.
  • polar solvents such as diglyme, glyme, THF - (tetrahydrofuran), or NMP (n-metal pyrrodlidone).
  • Polyamic acid films have enhanced wear resistance and a low coefficient of friction which can be further improved by incorporating a silicon moiety.
  • siloxane modified polyamic acids are known, and are commercially available from M and T Corporation. If desired, a visible change can be produced when the electrical current pulse is applied by incorporating a colour formation material which will undergo a colour change only at these elevated temperatures. These dyes are well known in imaging methods and processes, and typically are very stable at temperatures below about 150 degrees C.
  • resistive layer 16 Other classes of materials can be used for the resistive layer 16, in order to provide direct image formation upon the application of electrical current pulses. As noted, these can be used to make long run printing offset masters.
  • One such class of resistive polymers comprises ionic polymers which are hydrophilic and exhibit good wear resistance. Conductive fillers, such as ZnO, CdS, Znl 2 , MoO, etc, are added to modulate the conductivity and water-holding capacity of these ionic polymers.
  • dye forming systems can be incorporated including either Leuco or thermochromic dyes. The use of these dyes will provide a visible change in the electrically imaged areas.
  • the recording medium 10 can. be used directly as an offset master or as a photonegative.
  • An example of an ionic polymer which can be converted into a non-ionic polymer by the application of electrical energy is a polyacrylic acid-polyamine complex, which is hydrophilic and ionic.
  • the transformation of this material to an oleophilic state when electrical energy is applied is represented by the diagram in Figure 4.
  • This concept is also adaptable to work in polymer-metal mapping for written-unwritten areas, respectively.
  • the unwritten areas can be removed with the solvents while the written areas remain intact because they have been made insoluble by the application of electrical energy during the writing operation.
  • the resistive layer 16 includes those materials which are thermally cross-linkable and water insoluble. Materials of this class can be used to provide masters having long press life for printing thousands of copies.
  • the resistive layer 16 includes a hydrophilic, water insoluble polymer binder and conductive material such as NnO, Ti0 2 , MoO, CdS, Sb 2 O 3 , Znl 2 , graphite, etc.
  • the thermally cross-linkable binder is one which will change from a hydrophilic state to a hydrophobic state when electrical currents of sufficiently high density are applied to the resistive layer 16 from the printing stylus 18.
  • the non-imaged areas (where no electrical current is applied) of the resistive layer 16 remain hydrophilic.
  • a visual change -can also be produced by incorporating a thermochromic dye in the resistive layer.
  • Suitable polymers for the thermally cross-linkable binder include combinations of low molecular weight Novolak type resins (orphenolformaldehyde- type) and polyacrylamides.
  • Novolak type resins orphenolformaldehyde- type
  • polyacrylamides When electrical energy is applied to this material, the Novolak resins are transformed to highly cross-linked resols, and acrylamide will change to a less basic imide or nitride. The end result is that the electrically imaged area of the resistive layer will be made hydrophobic, while the remainder of the resitive layer will stay hydrophilic.
  • Figure 5 An example of this transformation is shown in Figure 5.
  • Polyacrylamides in this combination can be replaced by high molecular weight polyamines, polyethers, polyoxyethylene aryl ether, polyvinyl pyrrolidone, etc.
  • thermo-setting resins such as phenolics, epoxies, ureas, melamines, and di-isocyanates can also be employed.
  • Poly functional monomers such as pentacryth- rital triacrylate can be included as an additive in polyvinyl alcohol, polyacrylamide, or polyacryiates to cause thermally-induced, cross-linking of the written area.
  • dia- zopolyacrylamides can be used, since they are hydrophilic polymers that are ionic. Upon heating, the loss of the diazo group is accompanied by the generation of reactive intermediates which undergo cross-linking in the exposed area. An example of this transformation is indicated in Figure 6.
  • diazo and diazonium sensitizers can be employed in polymer matrices, such as phenotfor- maldehyde resins, PVA, polyacrylamide, and polymethylmethacrylate-methacrylic acid co-polymers. These sensitizers are used for cross-linking and hardening.
  • FIG. 2 shows a recording medium 28 which can be used in combination with a multi-stylus head to make projection foils.
  • Recording medium 28 comprises a transparent substrate 30, such as Mylar (Registered Trade Mark), a transparent conductive layer 31 such as InSnO, and a resistive layer 32 in which colour can be produced for a colour change brought about by the passage of electrical current through the layer.
  • a mutti-styfus head includes printing electrodes or styli (one of which is shown at 34) and a broad contact (ground) electrode 36.
  • High density localized current flow beneath the printing stylus 34 is indicated by arrow 38, while arrows 40 indicate the lower density return current flow through ground electrode 36.
  • the high density localized current beneath the printing stylus 34 changes the colour of region 42 in order to make the coloured foil.
  • Resistive layer 32 undergoes image formation in selected areas when electric currents are localized in these areas in the layer, as a consequence of the polymer cross-linking/structure modification and/or colour formation which takes- place in these areas.
  • Resistive layer 32 is a polymer binder having conductive fillers, such as ZnO, Znlz, MoO, CdS, etc therein, and a colour defining material.
  • Polymers which may be used for this application include cellulose acetate butyrate - (CAB), CAB-urethane, epoxies, polyimides, polyorganosiloxanes and polyether-urethane blends, polyacrylates (PMMA, glycidylmethacrylate, PMMA-MA resins), and polyvinyl alcohol-diazoacrylamides.
  • CAB cellulose acetate butyrate -
  • CAB-urethane CAB-urethane
  • epoxies polyimides
  • polyorganosiloxanes and polyether-urethane blends polyacrylates
  • PMMA glycidylmethacrylate
  • PMMA-MA resins polyvinyl alcohol-diazoacrylamides
  • Thermo-chromic dyes may be used for the colour formation or colour change, as indicated in Figure 7.
  • the recording styli may be tungsten styli having diameters of approximately 10-150 micrometers. Recording currents of approximately 0.25-25 mA can be used, depending on styli diameters, at voltages of approximately 10-12V. For example, currents of 0.25-25 mA can be used with styli having diameters of about 20 micrometers.
  • the electrical pulse time duration can be from 0.1-2 msec. For layer resistivities as noted, energies of approximately 0.05-05J/cm 2 will provide the changes in the resistive layer that are necessary for localised imaging.
  • a recording medium has been described above in which a resistive layer has its properties locally changed in response to electrical currents from a multi-stylus recording head of the type used in resistive ribbon printing or electroerosion printing. Rather than requiring the erosion of a conductive layer or the transfer of an adjacent fusible ink layer, this type of recording medium is very efficient, because the electrical energy is converted to thermal energy in the layer in which the change is to occur.
  • the resolution and print quality pbtainable in resistive ribbon printing and electroerosion printing are also obtainable and can be exceeded with this type of recording medium, at power and energy levels less than that required for the prior art techniques.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Electronic Switches (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP86303123A 1985-04-30 1986-04-24 Matériel pour l'enregistrement pour appareil d'enregistrement tel que machines pour impression Withdrawn EP0200488A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72900685A 1985-04-30 1985-04-30
US729006 1985-04-30

Publications (2)

Publication Number Publication Date
EP0200488A2 true EP0200488A2 (fr) 1986-11-05
EP0200488A3 EP0200488A3 (fr) 1989-01-25

Family

ID=24929192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86303123A Withdrawn EP0200488A3 (fr) 1985-04-30 1986-04-24 Matériel pour l'enregistrement pour appareil d'enregistrement tel que machines pour impression

Country Status (2)

Country Link
EP (1) EP0200488A3 (fr)
JP (1) JPS61255898A (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3705439A1 (de) * 1987-02-20 1988-09-01 Man Technologie Gmbh Druckmaschine
EP0320577A3 (fr) * 1987-12-10 1989-07-05 Lexmark International, Inc. Negatif direct et production d'une matrice offset
EP0352612A1 (fr) * 1988-07-29 1990-01-31 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé de fabrication d'une plaque d'impression
WO1990002044A3 (fr) * 1988-08-19 1990-08-23 Presstek Inc Plaques de lithographie, procede et appareillage pour graver l'image
EP0313854A3 (fr) * 1987-10-30 1990-11-22 Lexmark International, Inc. Plaque directe pour offset par impression thermique résistive
US5052292A (en) * 1989-09-21 1991-10-01 Presstek, Inc. Method and means for controlling overburn in spark-imaged lithography plates
DE4039107A1 (de) * 1990-12-07 1992-06-11 Roland Man Druckmasch Vorrichtung zur bildmaessigen beschreibung einer druckform
US5165345A (en) * 1988-08-19 1992-11-24 Presstek, Inc. Lithographic printing plates containing image-support pigments and methods of printing therewith
EP0990516A1 (fr) * 1998-09-29 2000-04-05 Kodak Polychrome Graphics LLC Plaque lithographique à écriture directe, sans traitement et procédés de formation d'image et d'impression
EP1531042A1 (fr) 2003-11-17 2005-05-18 Agfa-Gevaert Précurseur de plaque d'impression lithographique sensible à la chaleur
US7297462B2 (en) 2003-11-17 2007-11-20 Agfa Graphics Nv Heat-sensitive lithographic printing plate precursor
US7380500B2 (en) 2002-10-31 2008-06-03 Agfa-Gevaert Process for the offset printing of patterns via the fountain medium
EP3032334A1 (fr) 2014-12-08 2016-06-15 Agfa Graphics Nv Système permettant de réduire les débris d'ablation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713822A (en) * 1948-12-20 1955-07-26 Columbia Ribbon & Carbon Planographic printing
US4081572A (en) * 1977-02-16 1978-03-28 Xerox Corporation Preparation of hydrophilic lithographic printing masters
JPS56117690A (en) * 1980-02-21 1981-09-16 Ricoh Co Ltd Electrically communicative recording material for flat plate printing
JPS5811154A (ja) * 1981-07-15 1983-01-21 Ricoh Co Ltd 平版印刷版の作成方法

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279066A3 (en) * 1987-02-20 1990-02-28 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Printing machine
DE3705439A1 (de) * 1987-02-20 1988-09-01 Man Technologie Gmbh Druckmaschine
EP0313854A3 (fr) * 1987-10-30 1990-11-22 Lexmark International, Inc. Plaque directe pour offset par impression thermique résistive
EP0320577A3 (fr) * 1987-12-10 1989-07-05 Lexmark International, Inc. Negatif direct et production d'une matrice offset
EP0352612A1 (fr) * 1988-07-29 1990-01-31 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Procédé de fabrication d'une plaque d'impression
US5165345A (en) * 1988-08-19 1992-11-24 Presstek, Inc. Lithographic printing plates containing image-support pigments and methods of printing therewith
WO1990002044A3 (fr) * 1988-08-19 1990-08-23 Presstek Inc Plaques de lithographie, procede et appareillage pour graver l'image
US5052292A (en) * 1989-09-21 1991-10-01 Presstek, Inc. Method and means for controlling overburn in spark-imaged lithography plates
DE4039107A1 (de) * 1990-12-07 1992-06-11 Roland Man Druckmasch Vorrichtung zur bildmaessigen beschreibung einer druckform
DE4039107B4 (de) * 1990-12-07 2004-08-26 Man Roland Druckmaschinen Ag Vorrichtung zum bildmäßigen Beschreiben und Löschen einer Druckform
EP0990516A1 (fr) * 1998-09-29 2000-04-05 Kodak Polychrome Graphics LLC Plaque lithographique à écriture directe, sans traitement et procédés de formation d'image et d'impression
US6190830B1 (en) 1998-09-29 2001-02-20 Kodak Polychrome Graphics Llc Processless direct write printing plate having heat sensitive crosslinked vinyl polymer with organoonium group and methods of imaging and printing
US7380500B2 (en) 2002-10-31 2008-06-03 Agfa-Gevaert Process for the offset printing of patterns via the fountain medium
EP1531042A1 (fr) 2003-11-17 2005-05-18 Agfa-Gevaert Précurseur de plaque d'impression lithographique sensible à la chaleur
US7297462B2 (en) 2003-11-17 2007-11-20 Agfa Graphics Nv Heat-sensitive lithographic printing plate precursor
EP3032334A1 (fr) 2014-12-08 2016-06-15 Agfa Graphics Nv Système permettant de réduire les débris d'ablation

Also Published As

Publication number Publication date
EP0200488A3 (fr) 1989-01-25
JPH0473708B2 (fr) 1992-11-24
JPS61255898A (ja) 1986-11-13

Similar Documents

Publication Publication Date Title
EP0200488A2 (fr) Matériel pour l'enregistrement pour appareil d'enregistrement tel que machines pour impression
US4915519A (en) Direct negative from resistive ribbon
US5175568A (en) Process and apparatus for forming image on novel recording medium
US5417164A (en) Thermosensitive recording material and thermosensitive recording method
US4800397A (en) Metal transfer to form printing master plate or printed circuit board
US5335001A (en) Process and apparatus for forming dot image capable of controlling dot size
JP2796575B2 (ja) 記録方法
US5177506A (en) Process for forming image on novel recording medium
US4836106A (en) Direct offset master by resistive thermal printing
JPS60145888A (ja) 放電記録材料
US4305082A (en) Electric recording system and electric heat recording sheet
US5486857A (en) Thermal imaging system
US5262800A (en) Thermal imaging system
JPH058575A (ja) 平版印刷用原版
US4836105A (en) Direct negative and offset master production using thermal liftoff
US4833021A (en) Non-impact electrothermic recording material
US4536437A (en) Electrothermic non-impact recording material
EP0384783B1 (fr) Méthode de fabrication d'un ruban pour l'impression de documents sans impact
JPS61254360A (ja) 要求カラ−・プリント機構
US5084331A (en) Electroerosion recording medium of improved corrosion resistance
JP3132860B2 (ja) 記録方法
EP0413569B1 (fr) Système thermique pour former des images
US5118348A (en) Magnetic ink for non impact printing of documents
Pennington et al. Resistive ribbon thermal transfer printing: A historical review and introduction to a new printing technology
EP0379673B1 (fr) Elément pour l'enregistrement par électro-érosion avec une résistance modifiée à la corrosion

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAB Information related to the publication of an a document modified or deleted

Free format text: ORIGINAL CODE: 0009199EPPU

RA1 Application published (corrected)

Date of ref document: 19861210

Kind code of ref document: A2

17P Request for examination filed

Effective date: 19870224

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19890725

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PENNINGTON, KEITH SAMUEL

Inventor name: COHEN, MITCHELL SIMMONS

Inventor name: SACHDEV, KRISHNA GANDHI