DE1671523A1 - Flat printing process - Google Patents

Description

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Flat printing process

The present invention relates to planographic printing, and more particularly the use of planographic printing forms, the print image of which is hydrophilic.

The known methods of planographic printing are based on the physical property of grease-like materials, water to repel. In normal planographic printing, the surface of the printing form bears a pattern of the image to be printed, the aua hydrophobic and hydrophilic sites. To produce such a printing form, one usually applies a hydrophilic one Surface image-wise a water-repellent substance, which is usually greasy, resinous or wax-like in character. According to a more recent method, the hydrophilic surface of a thermographic recording material is absorbed by Hydrophobicized by heat. The procedure is in the Belgian U.S. Patent 656,713 and related British Patent Applications 20 818/65 and 21 985/65.

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j ^ ir <Hs normal Fl & Dhdruok: printing inks are used which have a lipophilic phase, in which pigments and other suitable additives are incorporated which do not absorb water or absorb only a small amount Liquid moistens υπ to keep the non-printing areas hydrophilic.

For a more recent planographic printing process, the so-called "reverse flat printing process ¹¹ , a printing matrix is used, the printing areas of which are hydrophilic. In this case, electrical aqueous printing ink is used and the non-printing areas of the matrix are moistened with a colorless oleophilic liquid. The process can be carried out as "direct surface printing", ie it does not require the image to be reversed via an intermediate cylinder with a rubber blanket, as is the case with normal offset printing.

The object of the invention is »to develop an improved method of the reverse planographic printing type that uses printing plates works, the surface of which is hydrophilized by imagewise exposure to heat and / or pressure, the hydrophilic Image areas of the print form represent the parts to be printed. A process for the production of prints has now been found, which is characterized in that in a hydrophobic surface layer of a recording material which is on a hydrophilic or hydrophilizable intermediate layer or base adheres by image-wise heating or image-wise pressure

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a hydrophilic pattern is created.

The invention consists in the fact that mau an UmkeLr flat printing form produced by heating a recording material, that of a thermoplastic hydrophobic surface layer consists, which adheres to a hydrophilic or hydrophilizable intermediate layer or base, wherein the Heating takes place imagewise or whereby the absorbing material is subjected to an imagewise differentiated pressure, and that the heated parts of the surface layer are then imagewise are removed and / or that these heated layer parts are in the hydrophilic or hydrophilizable intermediate layer or underlay can penetrate.

The wrapping of the ehärmteη parts of the hydrophobic thermoplastic Surface layer in the hydrophilic intermediate layer or base can be achieved in that mar A porous hydrophilic material is used as an intermediate layer or underlay, onto which the hydrophobic surface layer is applied as a thin film or that one or more hydrophobic, fusible substances are in the surface layer used, which when heated with the hydrophilic substance <5 Connect or loosen intermediate layer or underlay.

According to a first embodiment of the method according to the invention for the production of pianographic printing forms which are suitable for pianographic reversal printing, a hydrophobic surface layer containing hydrophobic thermoplastic or sublimable substances, imagewise by infrared exposure transferred according to a template. This selective

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Carry-over is by softening or "imagewise enamel" Sublimation of the thermoplastic hydrophobic substances of the recording layer causes' which during the exposure in Be in contact with the heated image areas of the original. Me thickness of a hydrophobic surface layer suitable for this purpose is expediently between 0.1 / U and 20 / u.

To prevent contamination of the template by the hydrophobic substances dea recording material can be avoided during exposure between the original and the heat-sensitive ^ Insert an interlayer on the surface layer. This intermediate sheet preferably has a porous structure, and consists, for example, of a thin fat-absorbent Paper that is thermally conductive in the present arrangement.

For a later-described training of the invention Process in which heat is generated imagewise in radiation-absorbing substances that are hydrophobic in the thermoplastic Surface of the recording material are contained, this intermediate sheet should not be thermally conductive, i.e., it should prevent heat conduction from the template and but should be transparent to the heat-generating radiation used for exposure.

A second embodiment of the present method parts of a hydrophobic thermoplastic surface layer are melted imagewise and in a melted state

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in a suitable hydrophilic underlayer or underlay © solved. The hydrophobic substances, the surface layer are selected for this purpose so that, in the molten state, they are compatible with, or in other words, soluble in the hydrophilic system of the intermediate layer or backing are.

In a third embodiment of the method according to the invention, parts of the thermoplastic.hydrophobic surface layer are melted imagewise in the molten state and taken up by a porous hydrophilic base or intermediate layer.

According to a fourth embodiment of the present method becomes a printing form by applying pressure to it imagewise the base of a recording material produced which has a hydrophobic pressure-sensitive surface layer on a carries a hydrophilic or hydrophilizable base or intermediate layer. Pressure sensitive here means that the hydrophobic Layer, for example, by the impact of a scribe machine type erupts, so that the corresponding part of the hydrophobic layer similar to a carbon paper on Receiving material can be transferred. The substrate for the Pressure-sensitive material should in this case on the one hand as thin as possible and on the other hand in terms of mechanical Stress in the typewriter and during printing be as resistant as possible.

If according to one of the embodiments of the invention Process the hydrophobic surface layer under the action by heat and / or pressure is to be removed bidlweise, then

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the intermediate layer or underlay is attached to the now exposed Make hydroponic. This hydrophilization can can be done shortly before clamping the printing form on the printing cylinder.

In a preferred embodiment, the hydrophilized Printing form shortly before printing with the aqueous printing ink itself, and for this purpose uses a printing ink that contains one or more Contains substances that have a hydrophilic effect on the intermediate layer or base.

Examples of hydrophobic layers which are suitable for the method according to the invention are those known to the person skilled in the art called electrophotographic zinc oxide layers. These nominal densities contain photoconductive zinc oxide dispersed in an insulating binder and can be made hydrophilic, e.g. with potassium hexacyanoferrateClII) and / or acidic phosphates » Another example of a hydrophilic, hydrophobic layer material is an anodically oxidized aluminum foil, which become hydrophilic by treatment with a strong base and with phosphoric acid and hydrophilic colloids such as gum arabic can stabilize (British patents 913 591 and 946 538). Another example of a hydrophilizable one Materials is a sheet material that carries a pear metal layer, whose * surface is hydrophobic »for example made of copper and whose hydrophilic sub-layer is e.g. chromium. If now a thermoplastic hydrophobic surface layer is removed imagewise, then the exposed areas of the copper layer can be etched away, for example with EissnCIII) chloride and the hydrophilic parts of the Chroxos chi rush to these Bodies are exposed. -

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Another example of a "hydrophillic layer or such a sheet has a gelulose triacetate layer, or an ent apre hurrying leaf. The surface, this material's can be hydrophilized with the aqueous solution of a strong base.

For the production of the hydrophobic surface layer is expediently a film-forming thermoplastic hydrophobic substance or a corresponding mixture of such substances used, which make up a waterproof layer manufactures. Thermoplastic materials are preferably suitable for this purpose Substances with a melting point, melting range, or sublimation range between 40 and 120 ° C.

Examples of sublimable hydrophobic compounds are: Called biphenyl, camphor and naphthalene.

Water-repellent substances with a wax-like consistency are suitable as film-forming thermoplastic hydrophobic substances, such as natural modified or synthetic waxes,

as well as mixtures of such substances. (

Examples are hydrocarbons and fatty acids as well as their metal salts, fatty alcohols and higher aliphatic ketones, ethers and esters as well as sterols and their hydrophobic ones Derivatives.

The hydrophobic surface layer preferably contains more than 80 percent by weight of these substances.

For the embodiment of the method according to the invention, according to who tore the hydrophobic substance out of the layer structure

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or is dissolved in an underlying hydrophilic element, preferably hydrophobic "fusible" Substances with a low melt viscosity are used, e.g. waxes containing long alkane chains (CVgCcQ) and / or aliphatic ^ compounds that are used as fatty acids, fatty alcohols, Fatty esters and ethers are known.

Examples of suitable waxes are: beeswax, Shellac wax, carnauba wax, Oftndellila wax, ozocerite wax, Utah wax, montan wax and paraffin wax as well as synthetic ones Waxes such as chemically modified natural and mineral waxes, e.g. the so-called "IG waxes", chlorinated paraffins and synthetic paraffins made from ethylene.

Other suitable synthetic waxes are, for example under the trade names ACRAWAX, ARMID, VOLTALEF and CARLISIIE WAX well-known products.

ACRAWAX is a trademark of Slyco Chemical, Inc .. New York, M ". Y., USA for a nitrogen derivative of higher fatty acids.

ARMID is a trade name of Armor Industrial chemical Company, Chicago, 111. USA for fatty acid amides.

YOLTALEF is a trade name of Pechnlney - St.Gobain Paris - France for chlorinated and fluorinated hydrocarbons.

CARLISLE is a trademark of Carlisle Chemical Works, United States of synthetic waxes whose physical constants, United States provided by Bennett H. Industrial Waxes, Vol, I, Natural and Synthetic Waxes, (1963) Chemical Publishing Comp., Kew York ·

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Details of the different types of wax are given in the just mentioned work by Bennet H., as well as in the work "The Chemistry and Technology of Waxes" by Albin H. Warth 2nd edition, Reinhold Publishing Corp., New York.

To the melting point or the melt viscosity of the used To correct waxes, it may be beneficial to have two or more several of these waxy substances in the recording layer to used. * <

To increase the melting point of paraffin wax, may be added to the i-paraffin wax, for example bees or Carnauha wax. Another example is the addition of ozokerite wax, which is soft and plastic, to a paraffin wax, which has roughly the same melting point. The waxes can also be softened by adding oils, for example paraffin oil.

The hydrophobic surface of the recording layer, which is a has a non-porous structure, e.g. one that is not permeable to water Structure, does not need to contain waxes, i.e. instead of waxes, hydrophobic thermoplastic polymers or ( Resins can be used, such as, for example, silicone resins, polyethylene, polyvinyl stearate, polyhexamethylene adipate, a hydrogenated glyceryl ester the stearic acid or polyester of sebacic acid and 1,6-hexanediol.

If hydrophilic interlayers to absorb the melted Substances are used, these are preferably layers that contain hydrophilic colloids of the following classes:

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A) Water-soluble natural polymeric substances, e.g., agar-agar, Alginate, amylose, amylopectin, dextrin, gum arabic, caseir and gelatin;

B) Modified hydrophilic natural polymeric substances, ab-., derives from starch, cellulose and alginic acid.

Examples of water-soluble starch derivatives are:

1. non-ionic starches,
Starch acetates,
Starch hydroxyl ethyl ether,

Hydroxyalkyl, starch derivatives, such as hydroxyethyl and Hydroxypropy! Starch derivatives.

2. ionic starches

(the introduction of carboxyl · ·, sulfonair, sulfate or Phosphate groups in the molecule allowed the manufacture of water-soluble alkali metal or ammonium salt containing anionic starches, while the introduction of amino groups leads to cationic starches, e.g. aminoalkyl starches).

Suitable water-soluble cellulose derivatives are:

1. nonionic celluloses

(This group includes hydroxyalkyl, cellulose derivatives and Polyoxyalkylene cellulose derivatives).

2. ionic celluloses

(the introduction of carboxyl · -, sulfonair; SuIfai> - or Phosphate groups in the cellulose molecule allow the production of water-soluble alkali metal or ammonium salts anionic cellulose derivatives.

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Suitable ionic cellulose derivatives are e.g. Oarboxymethyl- * cellulose, methyl cellulose-m-sulfobenzoate, ethyl cellulose, Sulfosuccinate and acetyl cellulose sulfosuceinati

C) Synthetic water-soluble resins:
Examples are:

1. Water-soluble homo- and mixed vinyl polymers, for example Vinyl alcohol, !! - vinylpyrrolidone, yinyl methyl ether, Acrylic acid, methacrylic acid, maleic acid and acrylamide units contain ^

2 «water-soluble homo- and mixed polymers, the alkylene oxide * units such as ethylene oxide units;

3, water-soluble polycondensates, e.g., water-soluble alkyd resins and water-soluble polyester compounds.

The hydrophilic intermediate layer does not necessarily have to be hydrophilic Contain water-soluble polymers or colloids, but they can also be hydrophilic, water-permeable but water-insoluble Contain polymers, for example cellulose derivatives with hydrophilic substituents that cause water permeability, such as partially etherified or esterified cellulose, e.g. * Methy! cellulose with low methoqy content, ethyl cellulose, Benzyl cellulose, hydroxyethyl cellulose acetate, cellulose acetate sorbate and cellulose acetate butyrate, partially hydrolyzed Polyvinyl acetate, copolymers of styrene and allyl alcohol, Mixed polymers containing non-acetalized hydroxyl groups and vinyl copolymers containing small amounts of carboxylic acids or carboxylic anhydride, e.g. Contain maleic anhydride groups.

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In order to determine whether a hydrophobic substance can be dissolved in a certain hydrophilic polymer or colloid, it is expedient to first determine the melting point of the hydrophobic fusible material alone and then that of the mixture of this fusible material with the selected hydrophobic polymer or colloid, if the melting point of the mixture is significantly higher than that of the meltable hydrophobic substance alone, then the substances are compatible, while an unchanged melting point indicates the incompatibility of the substances. In this case, the hydrophilic polymer alone has a higher melting or softening point than the hydrophobic fusible substance.

Another method of choosing compatible compounds is to make a dispersion at room temperature the hydrophobic and the hydrophilic substance, and then heating the dispersion. If the dispersion provides a transparent homogeneous mixture when heated, the more transparent than the original even after cooling Dispersion remains, then this indicates the compatibility of the partners.

Heat- and pressure-sensitive printing matrices, which are advantageous can be used according to the above-described second embodiment of the method according to the invention, are in the Dutch patent application 67 04687.

To clarify the idea of the invention with regard to the degree of hydrophobicity α-hyrophilicity of the surface layer and intermediate layer or base, the following should be stated.

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The surface layer must be more hydrophobic than the underlying layer so that its water-repellent properties are sufficient to make a hydrophilic printing ink imagewise to be able to apply.

The hydrophobic recording layer can contain a certain amount e.g., 1 to 80 percent by weight, contain solid substances with a hydrophobic character in dispersed form, for example talc. The brittleness of the recording layer is thereby increased and its usefulness for recording using it is increased improved by pressure.

The hydrophilic intermediate layer can contain hydrophilic pigments, e.g. water-containing silicon dioxide, aluminum hydroxic, zinc oxide, barium sulfate,! titanium dioxide, basic lead carbonate, Barium carbonate, calcium carbonate, kaolin and / or kieselguhr.

About the image-by-image differentiation of the recording material To be able to assess visually, one came to incorporate dyes or pigments into the surface layer, which together with " remove the hydrophobic substance. If dark colored pigments or dyes are used, this increases Heat sensitivity of the surface layer. The content of Pigments and / or dyes can be up to 50 wt .- #, with the limitation that this results in the hydrophobic character the recording layer is not affected. Suitable pigments are e.g. carbon black, graphite, oxides or sulphides of heavy metals, especially heavy metals with an atomic weight between 45 and 210, such as manganese or lead sulfite or these

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Heavy metals even in a finely divided state, e.g. silver, Bismuthj lead, iron, cobalt or nickel. Soot is called heat absorbing pigment is preferred.

Layers which contain a large amount of light-absorbing pigments are expediently not used for recording processes in which heat is transferred from the image areas of the original to the recording layer. More suitable are those layers for the processes in which heat in the recording material itself electromagnetic by imagewise exposure to W radiation, for example, is produced with visible or infrared light. In these cases, the exposure is of high intensity and short duration, for example less than 0.1 seconds. It is advisable to use a flash lamp for this purpose, which emits a light energy of at least 0.1 watt per cm. Light-absorbing pigments suitable for this purpose are described, for example, in British patent application 20 818/65. .

The support of the recording material used according to the invention is preferably flexible, so that the material with Rolls can be processed and clamped on a printing cylinder. Suitable materials for this purpose are, for example Aluminum foils, paper or synthetic resin films.

Purely used to produce the hydrophobic surface layer one expediently a solvent that does not dissolve the hydrophilic substances in the intermediate layer. Typical Solvent used for applying the hydrophobic

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Suitable substances are, for example, hydrocarbons and halogenated hydrocarbons, including benzene, toluene, xylene, ligroin, trichlorethylene, carbon tetrachloride, η-hexane, methylene chloride and ethyl acetate. The hydrophobic layer can also be sublimated or applied molten hydrophobic substances are produced. Of course The hydrophobic substances must not penetrate into the hydrophilic intermediate layer or base. All known devices are used for the production of the layers suitable.

A particularly suitable hydrophilic printing ink for the process according to the invention is disclosed in the British patent application 7 800/65 (in accordance with the Belgian Pa +. *> «>« "Ehr lit 676 898).

A hydrophilic printing ink for reverse planographic printing is not necessary necessarily consist primarily of water. In the colored hydrophilic phase, hydrophilic compounds dissolved in water can be used in relatively large amounts, e.g. up to 80 percent by weight, based on water. This makes the printing ink more viscous. Hydrophilic compounds that are Water-soluble poly oils are particularly suitable for this purpose, e.g. ethylene glycol and water-soluble polyoxyalkylene compounds. The hydrophilic phase preferably contains a wetting agent and can with the help of a water-soluble dye or pigments * The preferred pigment for black printing inks is carbon black.

The colorless or essentially colorless hydrophobic phase of the printing ink (rock one in the hydrophilic phase which is pergated or used as a dampening liquid)

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should · no solvent for the hydrophobic substances in the surface layer contain »dais the quality of the printing form could affect.

One of the most interesting advantages of the present invention is the ability to manufacture planographic printing plates completely dry road. In case of hydrophilization of the intermediate layer or underlay is necessary, it can be carried out in the printing machine itself, for example during of rubbing the die with printing ink.

example

A paper backing (90 g / m) is ^{coated at 45 °} C. with a mixture of the following composition (36 m / 1):

Water 1000 ecm

GYANAMER P 26 (trade name of American Cyanamid Go., Hew York, USA for a sodium salt of the copolymer of acrylamide and acrylic acid (80/4/16)) 50 g

12.5 $ solution of saponin in k a mixture of water and ■ ethanol (80/20) 10 ecm

The dry layer is then at 60 ⁰ C with a Μαοϊκό

Coated layer of the following composition (36 m / l): Carbon tetrachloride 1000 ecm

WARCO wax 170 A yellow (trade name of Warwick Wax Co., Inc. Long Island City, USA) for a microcrystalline saturated hydrocarbon wax with a melting range between 76 and 79 ^° C. 100 g

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The dry wax layer of the material produced in this way brings aan jiue into contact with a gate layer, aie Has infrared-absorbing image areas, where dl © image area lie on top of the wax layer.

Exposure is carried out reflectographically with the aid of a radiation source through the substrate of the recording material, and a finished printing form for reverse printing is obtained. The printing form is rubbed with the printing ink produced as follows ^:

Urea 12.5 g

1,6-hexanediol 40 g

a 53% aqueous dispersion

of the copolymer

n-butyl acryl; and vinyl acetate

(72/28) 20 g

80 $ aqueous solution of a Melamine formaldehyde resin. 37 »5 g

Triethanolamine 1.5 g

30 $ aqueous solution of the

Mixed Poly 'Ammonium Salt

merisates from vinyl acetate and

! Crotonic acid (95/5) 110 g

are added with stirring to 250 g of an aqueous carbon dispersion each containing 100 g of 53 g of carbon, 23 g of water, 18 g of ethylene glycol and 6 g of nonylphenyl polyethylene oxide. 300 cc of white spirit (boiling range are given 140 200 ⁰ C to the mixture, whereupon. The mixture, with the aid of an ultrasonic generator dispersed.. <· Man ·

The printing form is attached to a printing cylinder and rubbed with the printing ink described above. The printing form delivers on normal paper in direct printing, i.e. without intermediate AG 303 ". -17- 109840/0313.

^ keeping an offset roller, legible copies.

The printing form "produced in the manner described" is also pressure-sensitive. By writing on the Aufzeicttnungs ™ "material with a typewriter, one obtains a hydrophilic image that has been preserved since time immemorial, ie the recording material ¹ is" as a printing form for direct reverse surface printing

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Claims (1)

; 71523 Patent claims: 1 ". Method of making you printing using a printing form, characterized in that in a hydrophobic surface layer of a recording material, the on a hydrophilic or hydrophilic interlayer or base adheres, by image-wise heating or image-wise Printing a hydrophilic pattern is created » 2. The method according to claim 1, characterized in that a reverse printing form is used as the recording material * which has a thermoplastic hydrophobic surface layer which is applied to a hydrophilic intermediate layer or base and that the recording material is heated in accordance with the image to be reproduced or that an image-wise differentiated pressure is exerted on the recording material, that the heated areas of the recording layer are removed imagewise and / or that the heated areas of the adhesive are allowed to penetrate into the hydrophilic or hydrophilizable intermediate layer or substrate and that finally the hydrophilic or hydrophilic areas of the printing form obtained are colored with a hydrophilic printing ink, which during the Druekvbrganges is transferred image-wise to the material to be printed. 3. The method according to claim 2, characterized in that the hydrophilic printing parts are produced by heating the recording material or by applying pressure, that the printing form receives a reversed image that is for the • Direct printing is suitable. AG 3Q5 ~ - 19'- 109840/0313 BATH 4ο method according to claims 2 and 3? characterized, that parts of the hydrophobic surface layer by infrared irradiation of the template, which is in contact with the Surface layer and by subsequently peeling off the Recording material are image-wise transferred to the infrared-absorbing image areas of the original. 5e Yerfahren according to claims 2 and 3, characterized in that that parts of the hydroßhoben surface layer are transferred imagewise to an interleaf, which during the imagewise ™ heating between the original and the hydrophobic thermoplastic Surface layer is arranged and which is separated from the recording material after heating. 6. The method according to claims 2 and 3, characterized in that that bid-wise heated areas of the hydrophobic surface layer in the molten state imagewise into the -hydrophilic intermediate layer or document are transferred. · 7. Yerfahren according to claim 6, characterized in that. a porous hydrophilic intermediate layer or backing is used. 8. The method according to claim 6, characterized in that a hydrophilic intermediate layer or underlay is used which entiält entiält one or more hydrophilic substances which dissolve molten hydrophobic substances from the surface layer when heated and form a solid mixture with them after cooling.
AG 303 - 20 - 109840/0313 - ~ BAD ORIGlNAt ■ α ir » 9. The method according to claims 2 iinü -3 ₉ characterized in that the Umkelir flat printing film is produced fereli image-wise application of pressure through the support of the Aufz © ich · = · nungsmaterials, which drophilier a hydrophobic pressure-sensitive surface layer on a hydrophilic or hy drophilier "Baren surface of an intermediate layer or base 10 * Method according to one of the preceding claims, characterized in that characterized in that as a hydrophilizable intermediate layer or Underlay a layer is used that contains zinc oxide dispersed in a hydrophobic binder, anodically oxidized® Aluminum foil or a bimetal layer, or a Blaife, goodbye / that from a top layer of hydrophobic copper and a bottom layer consists of hydrophilic chromium. 11. The method according to one of claims 2 to 10 _? characterized by the use of a printing ink consisting of a colored hydrophilic phase in which a lipophilic phase which is non-colored or which contrasts in hue or density with the hydrophilic phase has been »dispersed. "( 12. The method according to claim 4, characterized in that the hydrophobic surface layer melted or softened imagewise and adhered to the image areas of the original by cooling and that these places when separating the original from the surface layer by tearing it onto the original be transmitted. AS 303 -21- 109840/0313 13 · The method of claim 5 _S characterized in that -. ■■ - ■ is the hydrophobic surface layer imagewise melted or srwticht and is absorbed in the heated state in the porous intermediate sheet. _: 14 * Method according to one of claims 4 and 5, characterized in that that the parts of the hydrophobic surface layer by sublimation on the image areas of the original or the Intermediate sheet are transferred. 15e method according to claim 9, characterized in that the Ml & wise pressure is generated by typewriter types, 16ο The method according to claim 10, characterized in that for the hydrophilicization of the zinc oxide hexacyanoferrate (IIl) ions are used for the hydrophilization of the anionic a base for oxidized aluminum and an etching liquid to remove the copper from the heated areas. 17o method according to claim 16, characterized in that the hydrophilizing agent is used in the hydrophilic phase of the printing ink. 18. The method according to any one of the preceding claims, characterized characterized in that a surface layer is used which consists mainly of hydrophobic, wax-like substances 19. The method according to any one of the preceding claims *, characterized in that a surface layer is used which contains hydrophobic substances which in the molten state with .- ■. ·. . _: , _: -22- 1OS84O / 0313 k ■ ■ '- BAD ORIGINAL - one or more hydrophilic substances present in the intermediate layer are miscible. 20. The method according to claim 19, characterized in that an intermediate layer is used, which is a polyacrylamide and a surface layer, which is mainly a microcrystalline Paraffin wax with a melting point between 40 and 120 ° C. contains. 21. The method according to claim 1, characterized in that a planographic printing form is used as the recording material, which has a thermoplastic hydrophobic surface layer attached to a hydrophilic intermediate layer or base and that the surface layer, which contains substances that convert the absorbed radiation into heat, imagewise is irradiated, with the heated hydrophobic body ?! the Layer * allows to penetrate into the intermediate layer of the substrate and / or transfers the heated areas in the molten, softened or sublimated state to an original a sheet which is transparent to the copying radiation and which is between the surface layer and the one knitting template representing original is arranged. AG 303 ..- :. ' - 23 - ■ "■ 109840/0313