EP1456030A1 - Verfahren zur herstellung von tiefdruckformen, tiefdruckformen und deren verwendung - Google Patents
Verfahren zur herstellung von tiefdruckformen, tiefdruckformen und deren verwendungInfo
- Publication number
- EP1456030A1 EP1456030A1 EP02803036A EP02803036A EP1456030A1 EP 1456030 A1 EP1456030 A1 EP 1456030A1 EP 02803036 A EP02803036 A EP 02803036A EP 02803036 A EP02803036 A EP 02803036A EP 1456030 A1 EP1456030 A1 EP 1456030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- imaging
- depressions
- imaging material
- substrate
- gravure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/003—Preparing for use and conserving printing surfaces of intaglio formes, e.g. application of a wear-resistant coating, such as chrome, on the already-engraved plate or cylinder; Preparing for reuse, e.g. removing of the Ballard shell; Correction of the engraving
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/003—Forme preparation the relief or intaglio pattern being obtained by imagewise deposition of a liquid, e.g. by an ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
Definitions
- the invention relates to a method for producing erasable and reimageable gravure printing forms, in which a substrate is provided which is provided with a grid of defined depressions and uniformly high webs, and in the depressions for forming a grid of cells which are matched to the tonal values of the printing original , Structures are produced from at least one removable imaging material, gravure printing forms from a substrate with a grid of depressions and structures made of removable imaging material which are brought into the depressions in accordance with tonal value, and the use of such gravure printing forms.
- a method of this type is known from DE 38 37 941 C2.
- Gravure printing plates are characterized by imaging wells, which are lower than the non-imaging printing plate surfaces and thus absorb printing ink and, after removing excess ink by means of a squeegee, from the non-imaging, uniformly high printing plate surfaces, upon contact with the printing material by splitting the ink on them transfer.
- imaging wells which are lower than the non-imaging printing plate surfaces and thus absorb printing ink and, after removing excess ink by means of a squeegee, from the non-imaging, uniformly high printing plate surfaces, upon contact with the printing material by splitting the ink on them transfer.
- the print template in accordance with tonal value
- it is usually resolved into a grid of lines and grid elements and the cups of the gravure printing plate are formed in the substrate in accordance with these grid elements.
- Gravure printing substrates are printing plates, printing cylinders or printing cylinder sleeves made of metal, ceramic or plastic.
- the imaging cells are removed by material removal in the form of etching or engraving processes. drive like engraving, laser or electron beam engraving.
- the technical, financial and time expenditure in the production and regeneration of such rotogravure forms is considerable, but since a large number of identical prints can be produced with high quality and productivity, they are mainly used for large runs.
- the known method described in DE 38 37 941 C2 is concerned with the production of an intaglio printing plate which, when colored before the printing process, takes up different amounts of ink in cells of different sizes and / or depths, an intaglio printing plate with at least one of the maximum transferred color amount of well-designed cell base grid produced and a solid substance that can be liquefied by the action of energy in a pixel transmission unit in an amount inversely proportional to the amount of color to be transferred is introduced imagewise into each of the wells.
- the image point transmission unit has a print head which is provided with at least one nozzle through which the liquefiable substance is sprayed out in an image by pressure in a melt spraying process.
- the gravure blank It is guided in a guide bar and transfers the substance line by line with individual addressing of each well directly or indirectly, and apparently preferred, via a transfer belt to the gravure blank.
- the substance is applied to a transfer film and is transferred using the thermal transfer process.
- a thermoplastic or wax can be used as the liquefiable substance that hardens very quickly in contact with the cold surface of the printing form cylinder.
- the gravure form is erased by the fact that its internal or external heating leads to liquefaction or sublimation of the substance and this is removed by an erasing device designed as a wiping and / or blowing or suction device.
- the owner of this method has developed the known method described in DE 195 03 951 A1 for producing an erasable and reusable gravure form, in which the depressions of the basic pattern of the gravure form are uniform be filled by means of a liquefiable substance by an application device, then material is removed from the wells by means of an image transfer device the gravure form, which is rasterized in the image, is colored by means of a coloring system and then printed in gravure, the gravure form is regenerated after the printing process and the depressions are filled evenly again.
- the liquefiable substance for which thermoplastics, photopolymers or lacquers are used, is introduced into the depressions in the liquid state by hydrodynamic forces, in particular by capillary action.
- the imagewise ablation is preferably carried out by the action of thermal energy, for example laser beams.
- the regeneration of the rotogravure form after the printing process provides that the liquefiable substance is completely removed from the depressions of the basic grid by ultrasonic cleaning or high-pressure water and this is again filled with liquefiable substance.
- only the material of the liquifiable substance removed by the image-wise ablation can be replenished.
- the gravure form which is screened in the image, is colored by means of a coloring system with UV printing ink and the printing process is carried out.
- the gravure form undergoes an erasing process using UV printing ink, preferably by refilling the ablated image areas.
- the filler can first be removed completely by laser ablation from the depressions in the rotogravure blank and then refilled.
- EP 0 776 763 A1 describes a process for the production of lithographic printing plates using the ink-jet technique and liquid ink-jet drops, which contain resin-forming reactants and after the application polymerize the plate. According to digital image data, a resin image is thereby generated on the plate and the printing plate thus produced can be used in offset printing.
- Such reactants comprise polymerizable resin-forming monomers - including low-molecular polymers, copolymers, polymer polymers and further polymerizable prepolymers such as oligomers - and initiators which bring about the polymerization and, inter alia, chemical Catalysts, air or oxygen or electromagnetic radiation can be.
- Non-solidified imaging materials are referred to below as precursors, which are defined as liquid, low-viscosity and non-pigmented substances, which can be introduced into the wells using the ink-jet technique and which do not have to be changed in their physical state before introduction and which are solidified physically by solvent removal and / or chemically by polymerization to form imaging material.
- the solidification of the precursor can advantageously be controlled in such a way that it does not take place until the precursor is introduced into the depressions.
- common devices and also common method steps can be used to introduce the at least one precursor into the depressions accurately and reproducibly with relatively little effort, so that from the substrate with depressions depth-variable or area-variable or depth- and area-variable gravure forms with the tonal values of Print template corresponding cups arise.
- this process step is also introduced as an image and that in the Wells solidified imaging material referred to as an imaging structure.
- the substrate can be imaged outside or advantageously inside the printing press.
- the gravure forms produced in this way can be colored using the techniques and machines commonly used for gravure printing and used for the printing process.
- the ink-jet technique can be used particularly well for the introduction of the precursors, since the prerequisite for defined individual points is optimally met and the image resolution (dots per inch) and the ink drop volumes (picoliter) are variable.
- both ink drops of the same volume and multiple ink drop volumes can be used, the tonal values being generated in binary form using dot density modulation of equally large pressure points (dots) and / or by modulating the individual drop volume and thus the individual pressure point.
- These variables can advantageously be adapted to the requirements of the method according to the invention, for example by The resolution and drop volume of the ink jet device and the depth grid are matched to one another, so that each well is addressable and can be completely filled with one or more droplets.
- ink jet printers with a relatively low resolution, e.g. 386 dpi, images with sufficient print quality can be generated.
- the process consistency in the production of the rotogravure form - and thus of the finished printed product - and the creation of the print samples (proofs) is also advantageous, since both are done using the ink-jet technique. Both methods are particularly advantageously based on the same data set and pigment-identical ink jet inks and gravure inks can be selected.
- the precursor can thus be introduced into the wells in a single-layer or multi-layer and image-wise manner in the form of defined, uniformly or variably large drops in accordance with a logged digital data inventory which was created by scanning a print file or processing digital image information. Due to the variably adjustable ink drop volume, the well filling height can be adjusted so that, according to the invention, a defined overfilling of a depression with a precursor can counteract any material shrinkage when it hardens.
- the data set used to generate the deepening grid is used to calculate the exact data. Addressing of the droplets is included in the database. In order to optimize the addressing and to take into account any manufacturing-related deviations in the substrate or to enable precise addressing without taking into account the data set used in the generation of the depth grid, it is advantageous if the surface of the substrate is optically scanned and recorded by a scanning head upstream of the printhead and the data thus obtained are forwarded to the ink jet device for data comparison.
- the intaglio printing forms according to the invention can also be produced inexpensively and with considerably less effort than conventional intaglio printing forms, in particular with the method according to the invention, which increases the data variability, although the techniques and machines used in conventional intaglio printing can be used in the printing process.
- they expand the use of rotogravure to medium and small print runs and offer a market-friendly and inexpensive solution for this segment, but also for large runs, which meets the high quality requirements for the printing result that are common in rotogravure printing and also includes wide substrates.
- each recess of a substrate provided with uniformly deep and large recesses in a matrix arrangement is filled completely or not at all with web structures, as a result of which all the wells reproduce pressure points with the same tonal value, but these by image resolution using a conventional binary ink jet grid, e.g.
- Error diffusion are distributed so that the printed image is still reproduced in accordance with the tonal value.
- Well depth and size of the well openings are therefore always the same and correspond to those of the wells that have remained unchanged, which is why the wells of this rotogravure form are neither variable in depth or area in the sense of conventional rotogravure forms but binary-area variable, since the printed image is also due to the ratio of printed to unprinted areas is played.
- the depressions are filled with precursors to such an extent that in the depressions imaging structures of different heights and thus depth-variable gravure forms are formed.
- the imaging structures can be constructed in one or more layers, the individual layers being hardened (for example in the case of UV-curing systems) or hardened and the drops being precise can be sprayed on top of each other.
- relatively high imaging structures can advantageously be built up in layers, which on the one hand enables many different well depths and thus tonal values to be generated, and on the other hand can also use printing inks with volatile solvents in the printing process by means of adapted well depths.
- Another advantage is the expanded range of usable precursors, because e.g.
- Two-component systems can be used, which, by spraying the drops onto one another with pinpoint accuracy, mix on the substrate using the ink-jet device and solidify in the depressions.
- Hardened imaging materials which may be deposited on the webs in smaller quantities, can also advantageously be easily scraped off with a doctor blade before curing, which can be repeated before each layer application.
- variable-area and even binary-variable variable gravure printing forms can advantageously be produced by two different procedures.
- the precursor is introduced directly into the depressions in an image-wise manner, and the intaglio printing plate is produced with imaging cells.
- the wells of the intaglio printing form thus primarily arise from imagewise material build-up and not from material removal, which means that the additional process step of imagewise ablation is not necessary.
- the depressions are initially covered with web structures in such a way that the areas of the depressions in the substrate that form imaging cells in the rotogravure form to be produced are covered with imaging material and any further explained below, protective layer is not attacked.
- a second precursor is introduced into the then still unfilled areas of the depressions at a time determined by the hardening time of the material introduced first, which does not attack the imaging material introduced first and the possible protective layer, i.e. attack, remove or attack dissolves - and the imaging material introduced first is then removed, for example by suitable solvents, without the second imaging material and the attack any protective layer, then the gravure form to be produced with imaging wells is created.
- the two-stage process has the advantage, among other things, that it is relatively uncritical if smaller amounts of the imaging materials are possibly deposited on the webs, because when the first imaging material applied and the second imaging material deposited thereon are also removed.
- the web surfaces can advantageously also be covered with a thin layer by rolling on with high-viscosity auxiliary protective layers before the imaging process, which can be removed together with any imaging materials prior to the printing process by washing with suitable solvents.
- auxiliary protective layers can be covered with a thin layer by rolling on with high-viscosity auxiliary protective layers before the imaging process, which can be removed together with any imaging materials prior to the printing process by washing with suitable solvents.
- the gravure printing forms produced according to the invention When constructing the gravure printing forms produced according to the invention and when using them, it is advantageous that a large number of different — in particular organic — materials with very different properties are available, from which the imaging materials and, if appropriate, the protective layers and also the printing inks can be selected such that they are chemically and physically compatible with one another to the extent required, as described, for example, in the two-stage reversal process, and are easily removable again.
- a material that can be solidified physically by solvent removal and / or chemically by polymerization to form one of the imaging materials is advantageously used as a precursor.
- Materials with high mechanical resistance e.g. Abrasion resistance and adhesion to the substrate, such as, for example, radiation-curing liquid polymers, since, above all, the web structures together with the webs, as explained below, are subjected to high mechanical stresses in the printing process.
- the imaging materials and the possible protective layer can be selected so that the gravure forms produced with them are suitable for various color systems that can be used in gravure printing and are therefore not limited to specific colors.
- Substrates can consist of metal, plastic or ceramic, all of which can be in the form of printing cylinders, cylinder sleeves or plates and advantageously have uniformly high webs and an almost 100% doctor blade support.
- ceramic substrates which have a very high mechanical resistance and thus a long service life. This is necessary because during the inking process in the printing process, excess ink is removed from the webs by means of a doctor blade and the webs and the web structures are thereby subjected to considerable mechanical stress.
- the pigments incorporated in the printing inks create a strong mechanical load on the printing form in the squeegee gap.
- the production of ceramic substrates for example through the use of chromium oxide with a particle size of approx. 2-30 ⁇ m, creates a finely porous and therefore absorbent substrate surface. This advantageously increases the adhesion of the imaging materials to the substrate structure, but the imaging materials or also the printing inks can become embedded in these pores, making them difficult to remove again.
- the surface of the depressions or only the areas of the depressions on which imaging structures are to be produced are covered with a thin protective layer.
- a thin protective layer low-viscosity, solvent-based materials with a defined solids content (e.g. VC copolymers), which attaches to or accumulate on these surfaces after solvent removal, can be sprayed on or rolled or knife-coated over a whole area in a defined layer thickness of approx. 1 - 3 ⁇ m be sprayed on with the ink-jet device, the capillary action of the ceramic supporting this introduction. Due to the high solvent removal (approx. 60%), neither the volume of the depressions nor the adhesion of the imaging materials to the substrate is changed significantly and the protective layer remains in the substrate structure during the print application.
- the detachment of the imaging structures from the substrate is initiated primarily by chemical processes and not by physical or mechanical measures such as heating, laser erasing, ultrasound or high pressure water and is only supported physically or mechanically.
- This measure advantageously allows imaging materials and printing inks to be completely removed again from the substrate, even if residues remain in the substrate after they have been removed by means of suitable solvents and mechanical cleaning, since these are detached together with the protective layer when the protective layer is removed by means of suitable solvents.
- the precursors are matched in their viscosity and their rheological properties to the requirements of the method according to the invention and to the use of the ink-jet technique and can also contain auxiliaries such as initiators, waxes and wetting agents.
- Imaging materials that harden physically through solvent removal can usually be dissolved again in common defined solvents despite these additives.
- solubility of imaging materials that can be hardened by polymerization such as UV-curing systems, can be influenced in such a way that they are no longer attacked by normal solvents and, especially in the case of substrates made of ceramic, can only be removed from the wells by aggressive solvents such as methylene chloride in conjunction with mechanical measures release completely.
- the properties of the ceramic substrate and the above-mentioned coordination between protective layer, precursor or imaging materials, solvent groups and printing ink systems can be advantageously combined. If a protective layer that is soluble in N-methylpyrrolidone and then a precursor that can be solidified by polymerization are introduced into the substrate, e.g. be printed with alcohol-based printing inks. After completion of the print job, the printing form is deleted and e.g. impregnated with N-methylpyrrolidone.
- print heads or spray heads can be used, which are arranged one after the other parallel to the substrate cylinder on a traverse in the y direction or and / or are attached in the x direction on several parallel cross members and can move in both directions of the cross members.
- print heads or spray heads can be used, which are arranged one after the other parallel to the substrate cylinder on a traverse in the y direction or and / or are attached in the x direction on several parallel cross members and can move in both directions of the cross members.
- the subsequent layers must be applied at suitable, media-dependent, different intervals. You can do that alternately in different running directions or, in the case of a sufficient spatial distance of the print or spray heads guiding the different media, in the same running direction.
- This spatial distance can preferably be set in a targeted manner in accordance with the required time interval in the y and / or x direction by means of variably placeable print heads or spray heads and / or traverses. However, it is also possible to apply only one medium with each roller revolution.
- FIG. 1 is a perspective view of an enlarged section of a ceramic substrate for rewritable gravure forms, which has depressions that are uniformly deep, have uniform openings, and form a grid in the form of a matrix arrangement,
- FIG. 3 shows a detailed view of the cross section through the recess pattern of a ceramic substrate with specific roughness after polishing
- FIG. 4 is a top view of an enlarged detail from the substrate shown in FIG. 2,
- FIG. 5 is a top view of an enlarged detail from the substrate shown in FIG. 3,
- FIG. 8 shows the substrate shown in FIG. 1 with binary surface-variable imaging structures 9 shows the example of a cleaning system
- FIG. 12 is a schematic, greatly enlarged plan view of a section of a non-ceramic substrate for rewritable gravure forms, which has depressions that are uniformly deep, have uniform openings, and form a grid in the form of a matrix arrangement,
- FIG. 13 shows a schematic representation of an embodiment of an area-variable gravure form, in which the depressions of the substrate shown in FIG. 14 are covered with web structures,
- FIG. 14 shows a schematic representation of an embodiment of an area-variable gravure printing plate which has the same pattern as that in FIG. 15, but with cells instead of the web structures and web structures instead of the cells,
- FIG. 1 shows an enlarged section of a ceramic substrate 1 with uniformly deep, approximately identical depressions 2 in a matrix arrangement and uniformly high webs 3, which is preferably used in the method according to the invention. Due to the manufacturing process, laser ablation creates a melt deposit which, as shown in FIG. 2, causes an unspecific surface roughness 4 on the ceramic surface. This is polished off for the use of the substrate in the method according to the invention, in order as in PAGE 13 SHOULD NOT BE CONSIDERED FOR THE INTERNATIONAL / PHASE
- energy-meterable light guide and one or more UV diodes 13 can be made precisely.
- At least one material from the group of polymer solution such as e.g. liquid adhesives that bind physically by solvent removal or polymerizable monomers, prepolymers and polymers such as e.g. UV-curing liquid polymers, chemically setting adhesives and one- or multi-component reaction adhesives and their chemical catalysts or initiators for the polymerization and, accordingly, as solidified imaging material, at least one material from the group consisting of plastics, from which the solvent has been removed, hardened, polymerized polymers such as radiation-hardened polymers, Kait hardened one-component systems and fully reacted two-component systems selected.
- polymer solution such as e.g. liquid adhesives that bind physically by solvent removal or polymerizable monomers, prepolymers and polymers such as e.g. UV-curing liquid polymers, chemically setting adhesives and one- or multi-component reaction adhesives and their chemical catalysts or initiators for the polymerization and, accordingly, as solidified imaging material, at least one material from the group
- a precursor of a UV curing liquid polymer then consists e.g. About 80% from prepolymerized acrylics, monomers, prepolymers and oligomers and about 20% from photoinitiators, waxes, wetting agents and auxiliaries. As already described, such additives can significantly influence the dissolving behavior of the imaging materials.
- the precursors can be introduced into the wells in a single-layer or multi-layer and image-wise manner according to a logged digital data stock, the consolidation being able to be controlled in such a way that it does not take place until the precursor is introduced into the wells.
- this is achieved by using suitable solvents with suitable evaporation numbers and in the case of polymerizable monomers and polymers, e.g. achieved by exposure to radiation after insertion or precise overlapping with chemical catalysts or initiators.
- the drops are jetted out of the printhead and are mixed by precise overlapping.
- the at least one precursor is introduced into the selectable, different recess grids of the substrate in such a way that either depth-variable or area-variable or depth-and area-variable and preferably binary area-variable and depth- and binary area-variable gravure forms are created.
- FIG. 8 shows the substrate 1 shown in FIG. 1 with depressions 2 in a matrix arrangement and with binary surface-variable imaging structures 14, the resolution and drop volume of the ink jet device being adapted to the depression grid and thus addressing each depression. became cash.
- a printer resolution of 386 dpi corresponds to a substrate line width of 152 lines / cm.
- the image resolution was frequency-modulated, for example by means of error diffusion.
- both the screen types used in gravure printing for example depth-modulated or amplitude-modulated screens
- the digital screen types of the ink-jet device for example dither matrix or error diffusion, or variations and mixtures of both or other screens
- all gravure forms that can be produced can choose different, also stochastically distributed, depth grids.
- the number of lines per cm of the imaging grid can be greater than, equal to or less than the number of lines of the deepening grid and the volume of the variable or uniformly large precursor drops can be greater than, equal to or less than the volume of the individual wells.
- printing inks When printing with gravure forms, it is advantageous to use printing inks, also for environmental reasons, which essentially contain water or water / alcohol mixtures as a solvent.
- the use of such printing inks expands the range of organic materials which can be used according to the invention as imaging materials and for the protective layer, since materials can be used for these which are preferably used in solvents for organic substances such as hydrocarbons, in particular fluorocarbons, tetrahydrofuran, dimethylformamide and N-methylpyrrolidone are soluble.
- hydrocarbons in particular fluorocarbons, tetrahydrofuran, dimethylformamide and N-methylpyrrolidone are soluble.
- it is also possible to use other printing ink systems which are matched to these materials in accordance with the process and with various, more volatile solvents or without solvents.
- the gravure form is cleaned of the printing inks and then deleted. Residues of ink remaining on the substrate are removed during this deletion process with the protective layer and the imaging material.
- closed cleaning systems are preferably used, as shown in FIG. 9, in which gravure printing forms 15 are freed of imaging material and protective layer using solvent 16, such as N-methylpyrrolidone, with the aid of ultrasound 17.
- solvent 16 such as N-methylpyrrolidone
- the porous substrate surface of the ceramic can advantageously be used in conjunction with the protective layer and its solubility, since the solvent triggers and removes the protective layer by diffusion and thus ensures an almost residue-free detachment of the protective layer, imaging material and printing ink.
- the remaining dirt particles are removed in a water bath 19 and evaporating solvents are fed to a recovery 20, after which the substrate 1 shown in FIG. 1 is again obtained, which is then loaded again. can be developed.
- the protective layer mentioned according to the invention must be renewed before each imaging.
- the production of a preferred, binary area variable, erasable and reimageable gravure printing plate with the method according to the invention and the use of the gravure printing plate produced thereby will be described with reference to FIGS. 10a to 10e.
- the starting point is a substrate 1 shown in FIG. 1 with uniformly deep, approximately identical depressions 2 in a matrix arrangement and with webs 3 of uniform height.
- the grid line width is preferably approximately 60-300 lines / cm.
- FIG. 10 a shows a cross section through the substrate 1 shown in FIG. 1.
- a protective layer (not shown) in the form of a polymer solution is first introduced into the depressions 2.
- a precursor is then introduced into the depressions 2 by means of the ink-jet technique, preferably in accordance with a logged digital data inventory, in one or more layers and solidified to form the web structure 21.
- An example of a rotogravure form which is variable in terms of binary surface is formed, the depressions either being completely filled with web structure 21 or not being filled at all, as a result of which the cups 14 correspond to the depressions with approximately identical dimensions and do not vary in depth and size of the cup opening.
- the wells 14 therefore all have the same volume and the tonal values result solely from the distribution of these wells 14 in the substrate.
- the imaging material must be removable after use, have a high mechanical resistance and must not be attacked by the printing ink systems used.
- Fig. 10b The structure shown in Fig. 10b is filled with printing inks 22 which e.g. contain water or water / alcohol mixtures as solvent, the protruding printing ink is stripped off with a doctor blade according to Fig. 10c, then the gravure form is brought into contact with the printing medium, e.g. a paper web.
- printing inks 22 e.g. contain water or water / alcohol mixtures as solvent
- the protruding printing ink is stripped off with a doctor blade according to Fig. 10c, then the gravure form is brought into contact with the printing medium, e.g. a paper web.
- the imaging material is then - optionally after cleaning with the solvent for the printing inks - by adding, removing , or dissolving with solvents or solvent mixtures which dissolve the imaging material, and / or with a chemical with which the imaging material reacts, or the imaging material is removed from the sub-layer by dissolving the protective layer. strat replaced.
- These processes can be supported by mechanical means, for example by brushing or the use of an ultrasound device. What remains is the shape shown in FIG. 10e, which is identical to that shown in FIG. 10a. It can now be illustrated with a predecessor.
- the method can also be used to generate particularly advantageous depth-variable and binary-area-variable gravure forms that can be deleted and imaged again.
- the depth of binary-area-variable cells is additionally varied by appropriate screening, which creates depth- and binary-area-variable cells with different volumes and, depending on the number of selected depths, a larger range of tonal values can be achieved. It is described with reference to FIGS. 11a-11e.
- the starting point is again a substrate 1 shown in FIG. 1 with uniformly deep, approximately identical depressions 2 in a matrix arrangement and with uniformly high webs 3.
- the grid line width is preferably approximately 60-300 lines / cm.
- FIG. 11 a shows a cross section through the substrate 1 shown in FIG. 1.
- a protective layer (not shown) in the form of a polymer solution is first introduced into the depressions 2.
- a precursor is then introduced into the depressions 2 by means of the ink-jet technique, preferably in accordance with a logged digital data inventory, in depth and binary-area-variable form in one or more layers and solidified to form imaging material.
- the depth of the wells which are distributed in a binary-area-variable manner is varied by means of imaging structures 23 of different heights, which in turn creates wells 14 which correspond to the depressions with approximately identical dimensions and do not vary in depth and size of the well opening, and additionally wells 24 arise, the depth of which is different.
- the imaging material has the same properties as that of FIGS. 10b-10d and is formed from the same precursors.
- Fig. 11b The structure shown in Fig. 11b is filled with printing inks 22 which e.g. contain water or water / alcohol mixtures as solvent, the protruding printing ink is wiped off with a doctor blade according to Fig. 11c, then the gravure form is brought into contact with the printing medium, e.g. a paper web.
- printing inks 22 e.g. contain water or water / alcohol mixtures as solvent
- the protruding printing ink is wiped off with a doctor blade according to Fig. 11c
- the gravure form is brought into contact with the printing medium, e.g. a paper web.
- FIG. 11d which only has residual paint, which practically corresponds to that shown in FIG. 11b, is then deleted using the same method as described with reference to FIG. 10d.
- the rest remains in Fig. 11e shown form, which is identical to that shown in FIG. 11a. It can now be illustrated with a predecessor.
- the process can also be used to create variable-area gravure forms that can be deleted and re-imaged.
- the size of the well openings is varied, while the depth of the well remains the same. They are described with reference to FIGS. 15a-15e and 13 and 14.
- the production of an intaglio printing form as shown in FIG. 13, and its use will be explained with reference to FIGS. 15a to 15e.
- the substrate 25 shown in FIG. 12 with uniformly deep, approximately identical depressions 2 in a matrix arrangement and with uniformly high webs 3, which represents a non-ceramic substrate, can serve as the basis for the variable-area gravure form.
- the grid line width is preferably about 60-300 lines / cm.
- FIG. 15a shows a cross section through the substrate 25 shown in FIG. 12.
- a precursor is introduced into the depressions 2 by means of the ink-jet technique, preferably in accordance with a logged digital data inventory, in one or more layers and solidified to form the web structure 21.
- An example of an area-variable gravure form is formed, the depressions being filled with web structure 21 in such a way that wells 26 with different sizes of the well opening are created at the same depth, as a result of which the volume of the wells 26 varies and different tonal values can be generated.
- the imaging material has the same properties as that of FIGS. 10b-10d and is formed from the same precursors
- Fig. 15b The structure shown in Fig. 15b is filled up with printing inks 22 which e.g. contain water or water / alcohol mixtures as solvent, the protruding printing ink is wiped off with a doctor blade as shown in Fig. 15c, then the gravure form is brought into contact with the printing medium, e.g. a paper web
- printing inks 22 e.g. contain water or water / alcohol mixtures as solvent
- the protruding printing ink is wiped off with a doctor blade as shown in Fig. 15c
- the gravure form is brought into contact with the printing medium, e.g. a paper web
- FIG. 15d which only has residual paint, which practically corresponds to that shown in FIG. 15b
- the structure is then deleted using the same method as described with reference to FIG. 10d, with no protective layer having to be removed.
- FIG. 15e which is identical to that shown in FIG. 15a.
- FIG. 13 shows FIGS. 15b and 15d in supervision.
- the depressions of the area-variable gravure form are filled with a web structure 21 in such a way that wells 26 with different sizes of the well opening are created at the same depth, whereby the volume of the wells 26 varies and different tonal values can be generated.
- the gravure form shown in FIG. 14 shows the same pattern as FIG. 13, but there are wells 26 at the locations in FIG. 14 at which web structures 21 are located in FIG. 13 and vice versa, i. H. the web structures in FIGS. 13 and 14 are complementary to one another in that, taken together, they completely fill the recess grid of FIG. 12.
- the intaglio printing form shown in FIG. 14 can be produced by introducing the precursor directly into the depressions in an imagewise manner and thus producing the intaglio printing form with imaging cups.
- the gravure form shown in FIG. 13 can be converted into the one shown in FIG. 14 using the two-stage reversal method.
- the depressions 2 are initially covered with web structures 21 in such a way that the areas of the depressions in the substrate which form cups in the gravure printing mold to be produced are covered with web structures 21 and a possible protective layer is not attacked in the process.
- a second precursor is introduced into the then still unfilled areas of the depressions in time - determined by the hardening time of the material introduced first - which does not attack the imaging material introduced first and the possible protective layer - i.e. attack, remove or attack dissolves - and the imaging material that was brought in first becomes, for example removed by means of suitable solvents without attacking the second imaging material and the possible protective layer, then the intaglio printing form shown in FIG. 14 with web structures 21 imaging wells 26 is produced. Also rotogravure forms which are variable in area can be produced with this reversal process.
- the second imaging material can be selected, for example, from the materials that are also used as the imaging material introduced first, provided that it is ensured that the imaging material introduced first is not attacked when the second one is applied and that it is not attacked when the first one is detached or detached.
- the method can also be used to create depth-variable gravure forms that can be deleted and re-imaged and in which tonal values are generated only by different cell depths and not additionally by the distribution of the cells become. It is described with reference to FIGS. 16a-16e.
- the starting point is again a substrate 1 shown in FIG. 1 with uniformly deep, approximately identical depressions 2 in a matrix arrangement and with uniformly high webs 3.
- the grid line width is preferably approximately 60-300 lines / cm.
- FIG. 16a shows a cross section through the substrate 1 shown in FIG. 1.
- a protective layer (not shown) in the form of a polymer solution is first introduced into the depressions 2.
- a forerunner is then introduced into the depressions 2 by means of the ink-jet technique, preferably in accordance with a logged digital data inventory, in variable-depth images in one or more layers and solidified to form imaging material.
- An example of a variable-area gravure form is formed, the depressions being filled with imaging structures 27 in such a way that wells 28 of different depths are created with the same size of the well opening, as a result of which the volume of the wells 28 varies and different tonal values can be generated.
- the imaging material has the same properties as that of FIGS. 10b-10d and is formed from the same precursors.
- Fig. 16b The structure shown in Fig. 16b is filled with printing inks 22 which e.g. contain water or water / alcohol mixtures as solvent, the protruding printing ink is wiped off with a doctor blade according to Fig. 16c, then the gravure form is brought into contact with the printing medium, e.g. a paper web.
- printing inks 22 e.g. contain water or water / alcohol mixtures as solvent
- the protruding printing ink is wiped off with a doctor blade according to Fig. 16c
- the gravure form is brought into contact with the printing medium, e.g. a paper web.
- FIG. 16d which only has residual paint, which practically corresponds to that shown in FIG. 16b, is subsequently deleted using the same method as described with reference to FIG. 10d. What remains is the shape shown in FIG. 16e, which is identical to that shown in FIG. 16a. It can now be illustrated with a predecessor.
- a solution of polyvinyl chloride in tetrahydrofuran is applied to the entire surface of a substrate (see FIG. 10a). After the tetrahydrofuran has evaporated, a protective layer of polyvinyl chloride remains.
- a precursor which consists of a two-component adhesive with an adhesive component based on alpha-cyanoacrylic acid and a binder component, is inserted into the depressions of the substrate coated with it by means of an ink jet Device, as described with reference to FIG. 7, introduced pictorially, in which case first the filler component of the adhesive and then the binder component are sprayed onto one another with pinpoint accuracy and web structures are produced in layers. After the reactive curing of the adhesive, which takes about three minutes, the imaging material is present (see FIG.
- the polyvinyl chloride solution can also be selective, i.e. only be applied to the substrate areas, which are then covered with the precursor.
- the polyvinyl chloride solution is applied with the ink-jet device from a spray head, which is connected upstream of the spray head for the binder component, precisely and in time before the components of the adhesive.
- a solution of polyvinyl chloride in tetrahydrofuran, from which a protective layer of polyvinyl chloride is formed, is applied to the entire surface of the substrate shown in FIG. 1.
- a solution of nitrocellulose in ethanol is then introduced into the depressions as the first precursor by means of an ink-jet device, as described with reference to FIG. 7, by spraying several droplets onto one another, which are hardened or cured in between, the depressions having web structures.
- the areas of the depressions in the substrate that form imaging wells in the rotogravure form to be produced are covered with web structures.
- the areas of the depressions not covered with the first imaging material are then filled with a second imaging material or its precursor at an interval in time determined by the solidification time of the material introduced first, using an ink-jet device, as described with reference to FIG. 7.
- the two-component adhesive used in Example 1, as described there, or a UV-curing liquid polymer can be used as the precursor of the second imaging material.
- the gravure printing form to be produced lies with imaging. Well according to the tonal values of the print template. The gravure form is used and deleted as described in Example 1.
- the second imaging material can be coated, then hardened, for example when using UV-curing liquid polymers by means of UV rays, and then the substrate can be scraped off, as a result of which the excess coating and coating on the webs deposited material completely removed and the web surfaces of the imaging material lie in one plane with the surfaces of the webs.
- a solution of vinyl chloride copolymer in N-methylpyrrolidone is applied to the entire surface of the substrate shown in FIG. 1, from which a protective layer of vinyl chloride copolymer is formed after the N-methylpyrrolidone has evaporated.
- a solution of an alkyd resin in acetone, which hardens very quickly, is then introduced into the depressions as the first precursor by means of an ink-jet device as described in Example 2 to form the web structures described in Example 2, additional precursors being aimed specifically at the surfaces of the Webs is injected.
- the areas not covered with the first imaging material are then filled as described in Example 2 with a second imaging material or its precursor, which can consist of the same materials that are also listed in Example 2.
- the layer formed on the webs and with it any second imaging material which may have been deposited thereon is also removed.
- the gravure form to be produced with imaging cells is then available in accordance with the tonal values of the print template.
- the gravure form is used and deleted as described in Example 1.
- a solution of vinyl chloride copolymer in N-methylpyrrolidone is applied to the entire surface of the substrate shown in FIG. 1, from which a protective layer of vinyl chloride copolymer is formed.
- the surfaces of the webs are then covered with a highly viscous auxiliary protective layer of a plasticizer-based Alumini ⁇ umpaste thin layer by an elastic inking roller covers by rolling be ⁇ .
- a solution of an alkyd resin in acetone is then introduced into the depressions as the first precursor by means of an ink-jet device as described in Example 2 in order to form the web structures described in Example 2.
- Example 2 The areas not covered with the first imaging material are then filled as described in Example 2 with a second imaging material or its precursor, which can consist of the same materials that are also listed in Example 2.
- a second imaging material or its precursor which can consist of the same materials that are also listed in Example 2.
- alcohol-soluble auxiliary protective layer made of aluminum paste and with it the possibly deposited first and / or second imaging material.
- the gravure form to be produced with imaging cells is then available in accordance with the tonal values of the print template. The gravure form is used and deleted as described in Example 1.
- the closed cleaning system preferred during the deletion process can be located outside the printing press or can be integrated particularly advantageously into the printing press, for example by the ink application system is expanded to a closed system with which, for example, the respective solvents are applied to the rotogravure form instead of the ink and the various materials are replaced by an integrated ultrasound device.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Printing Methods (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10157096 | 2001-11-17 | ||
DE10157096 | 2001-11-17 | ||
PCT/EP2002/012897 WO2003041961A1 (de) | 2001-11-17 | 2002-11-16 | Verfahren zur herstellung von tiefdruckformen, tiefdruckformen und deren verwendung |
Publications (2)
Publication Number | Publication Date |
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EP1456030A1 true EP1456030A1 (de) | 2004-09-15 |
EP1456030B1 EP1456030B1 (de) | 2008-03-12 |
Family
ID=7706441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP02803036A Expired - Lifetime EP1456030B1 (de) | 2001-11-17 | 2002-11-16 | Verfahren zur herstellung von tiefdruckformen, tiefdruckformen und deren verwendung |
Country Status (5)
Country | Link |
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EP (1) | EP1456030B1 (de) |
AT (1) | ATE388819T1 (de) |
DE (2) | DE10253654A1 (de) |
ES (1) | ES2303567T3 (de) |
WO (1) | WO2003041961A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012022006A1 (es) | 2010-08-19 | 2012-02-23 | Bienzobas Saffie Fernando Andres | Sistema y método de impresión en dos dimensiones en un soporte de impresión de tres dimensiones |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1588846B1 (de) * | 2004-04-22 | 2006-08-09 | CST GmbH | Verfahren und Vorrichtung zur Herstellung von Tiefdruckformen |
DE102005011312B4 (de) | 2005-03-11 | 2006-12-28 | Koenig & Bauer Ag | Systeme zur Ausbildung von Rasterpunkten |
US20120234189A1 (en) * | 2011-03-17 | 2012-09-20 | Yehuda Solomon | Reuseable printing device |
US20120234190A1 (en) * | 2011-03-17 | 2012-09-20 | Yehuda Solomon | Reusable printing device |
DE102011002229A1 (de) | 2011-04-21 | 2012-10-25 | Fercon GmbH | Vorrichtung und Verfahren zur Herstellung von Tiefdruck- und Offsetdruckformen oder zum Bedrucken von zylindrischen Bedruckstoffen |
US20140352562A1 (en) * | 2013-05-28 | 2014-12-04 | Willard Charles Raymond, JR. | Method and apparatus for digital pad printing |
CN103991270A (zh) * | 2014-06-03 | 2014-08-20 | 中山火炬职业技术学院 | 一种基于喷墨保护实现重复利用的凹印版滚筒及印刷方法 |
CN105365355B (zh) * | 2015-11-05 | 2017-07-11 | 武汉大学 | 一种数字化可变凹印版辊 |
CN105415913A (zh) * | 2015-12-14 | 2016-03-23 | 张栋 | 可再生环保凹版及其制造方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2531514A1 (de) * | 1974-07-17 | 1976-01-29 | Crosfield Electronics Ltd | Darstellung von tiefdruckoberflaechen |
CH581543A5 (de) * | 1974-07-30 | 1976-11-15 | De La Rue Giori Sa | |
DE3837941A1 (de) * | 1988-11-09 | 1990-05-10 | Roland Man Druckmasch | Verfahren und vorrichtung zur herstellung einer tiefdruckform |
DE19503951C2 (de) | 1995-02-07 | 1998-04-09 | Roland Man Druckmasch | Verfahren und Vorrichtung für den Tiefdruck |
US5820932A (en) | 1995-11-30 | 1998-10-13 | Sun Chemical Corporation | Process for the production of lithographic printing plates |
DE19624441C1 (de) | 1996-06-19 | 1997-12-04 | Roland Man Druckmasch | Verfahren und Vorrichtung für den Tiefdruck mittels einer löschbaren Tiefdruckform |
-
2002
- 2002-11-16 ES ES02803036T patent/ES2303567T3/es not_active Expired - Lifetime
- 2002-11-16 WO PCT/EP2002/012897 patent/WO2003041961A1/de active IP Right Grant
- 2002-11-16 DE DE10253654A patent/DE10253654A1/de not_active Ceased
- 2002-11-16 EP EP02803036A patent/EP1456030B1/de not_active Expired - Lifetime
- 2002-11-16 DE DE50211895T patent/DE50211895D1/de not_active Expired - Lifetime
- 2002-11-16 AT AT02803036T patent/ATE388819T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO03041961A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012022006A1 (es) | 2010-08-19 | 2012-02-23 | Bienzobas Saffie Fernando Andres | Sistema y método de impresión en dos dimensiones en un soporte de impresión de tres dimensiones |
US9862145B2 (en) | 2010-08-19 | 2018-01-09 | Fernando Andrés Bienzobás Saffie | System and two dimensional printing method in a three dimensional printing support |
Also Published As
Publication number | Publication date |
---|---|
WO2003041961A1 (de) | 2003-05-22 |
ES2303567T3 (es) | 2008-08-16 |
DE50211895D1 (de) | 2008-04-24 |
EP1456030B1 (de) | 2008-03-12 |
DE10253654A1 (de) | 2003-07-17 |
ATE388819T1 (de) | 2008-03-15 |
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