EP2748002B1 - Procede de production d'une plaque d'impression pour l'impression offset sans mouillage - Google Patents

Procede de production d'une plaque d'impression pour l'impression offset sans mouillage Download PDF

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Publication number
EP2748002B1
EP2748002B1 EP12759664.1A EP12759664A EP2748002B1 EP 2748002 B1 EP2748002 B1 EP 2748002B1 EP 12759664 A EP12759664 A EP 12759664A EP 2748002 B1 EP2748002 B1 EP 2748002B1
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EP
European Patent Office
Prior art keywords
ink
carrier plate
printing
application
onto
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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.)
Not-in-force
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EP12759664.1A
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German (de)
English (en)
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EP2748002A1 (fr
Inventor
Gert SIEGER
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Sieger Gert
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Individual
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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
    • 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
    • B41C1/1066—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by spraying with powders, by using a nozzle, e.g. an ink jet system, by fusing a previously coated powder, e.g. with a laser
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/003—Printing plates or foils; Materials therefor with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/16—Waterless working, i.e. ink repelling exposed (imaged) or non-exposed (non-imaged) areas, not requiring fountain solution or water, e.g. dry lithography or driography

Definitions

  • the present invention relates to a process for producing a printing form for waterless offset printing.
  • Offset printing is an indirect lithographic printing process, which has been widely used in various fields since the beginning of the 20th century. In addition to its use in the area of book and newspaper printing, offset printing is used in particular in the area of commercial printing as well as the printing of packaging of all kinds. The fundamental principle of offset printing goes back to developments in lithography, as it was already used at the end of the 18th century.
  • a disadvantage of wet offset printing is that both for the production of the printing form, as well as in the printing process itself by the dampening solution, a variety of excipients are used, which you want to avoid environmental technology.
  • the waterless offset printing or dry offset.
  • the silicone-coated printing plate is lipophobic and repels the printing ink.
  • the printed image is applied by means of, for example, laser irradiation on the printing plate by the color-bearing areas of the printing plate are removed from the silicone coating.
  • On the printing form there is a segregation of the ink in the paint components on the one hand and silicone oil on the other hand, wherein the color components adhere to the free of the silicone layer areas of the printing plate.
  • the European patent application EP 0 672 950 A1 discloses a corresponding printing plate for waterless offset printing, which can be structured by laser irradiation accordingly.
  • a photosensitive layer is applied between a silicone coating and a carrier plate, which leads to a detachment of the silicone layer in the irradiated areas with laser radiation of suitable wavelength.
  • the areas thus exposed are lipophilic, so that the printing ink adheres to the printing form in these areas.
  • US 4,003,312 discloses a method of making a master by ink jet technique.
  • a master is provided by applying a silicone on a suitable substrate master by means of an inkjet printing device and curing the silicone to an elastomeric state.
  • an inkjet printing device can be used to apply a catalyst to an uncured silicone on a master substrate, thereby curing the silicone in the catalyst treated areas.
  • DE 19500486 A1 discloses a photosensitive lithographic printing plate that does not require dampening water.
  • the printing plate comprises an aluminum support on which a primer layer, a photosensitive layer, and a silicone rubber layer are applied, the aluminum surface having an average roughness R a of 0.2 to 0.8 ⁇ m and a whiteness of 0.10 to 0, 35 has.
  • EP 1046497 A1 discloses a method of making a lithographic printing plate comprising the step of spreading a novolak resin on a hydrophilic surface of a lithographic base in a predetermined pattern.
  • US 2006/0188813 A1 discloses a hydrophilic film on a master surface obtainable by heat or light induced curing of a composition having at least two five- or six-membered hydrophilic ring structures.
  • the compound can be applied by means of inkjet technology on the surface.
  • US 4003312 discloses a means for producing waterless lithographic printing masters provided by ink jet imaging means.
  • a master is created by applying a silicone or other material to a suitable base substrate by means of an inkjet printer and curing the silicone.
  • JP 56113456 disclosed in order to improve ink rejection in non-image parts and durability of the original plate, a method in which a silicone-modified photocuring resin is ejected by an ink jet method and imagewise coated on a support.
  • the waterless offset method offers the advantage that an emission of dampening solution, as occurs in wet offset printing, is avoided.
  • the printing machine itself can be dispensed with a dampening unit, which significantly reduces the design effort. This also reduces the maintenance of the printing presses. By dispensing with fountain solution can over it In addition, a corrosion of metal colors are avoided, which increases the color fastness of the print.
  • a disadvantage of the waterless offset printing technique is that the printing plates are more expensive than in the wet offset method. Also, the plates used are sensitive to scratching and after their development (exposure) only difficult to correct. With previously used ink jet process for the production of printing plates can not be achieved sufficient resolutions to produce high quality prints. Also, the achievable durability of the printing plates thus produced is significantly limited, so that they can be used only for printing very small runs.
  • the printing plate is produced in such a way that the area of the carrier plate which should not bear any color as a printing form in the printing process, be provided by means of inkjet technology with a coating which is sufficiently lipophobic to reject the ink, while not coated areas of the support plate are sufficiently lipophilic that ink adheres.
  • a negative of the printed image is applied to the carrier plate by coating the non-color-bearing background of the printing plate.
  • support plates with a surface tension of ⁇ 35 mN / m are suitable for safely carrying printing inks, while inks which have a surface tension of ⁇ 30 mN / m in the fixed state reject printing inks with sufficient certainty. It was thus surprisingly found that a difference in surface tension between the ink-bearing areas and the ink-repellent areas of the printing form of ⁇ 5 mN / m is sufficient to produce a printed image in waterless offset printing.
  • the carrier plate consists of a material from the group consisting of aluminum, aluminum alloys, steel, polycarbonate, polyester and polyolefin.
  • the surface is to be understood as the area of the carrier plate which comes into contact with the printing ink in the printing process.
  • the carrier plate may be a composite structure which consists of a base carrier on which a material of the above mentioned group is applied.
  • a polycarbonate layer is applied to a base carrier made of sheet steel.
  • the carrier plate consists of only one material.
  • the carrier plate is pretreated before the application of the ink to change the surface roughness.
  • the surface roughness R a of the support plate is set to less than 1 micron. The roughness is determined according to EN ISO 25178. By setting a corresponding roughness is ensured that the ink has a sufficient adhesive strength in the fixed state on the support plate to ensure a sufficient longevity of the printing form. A sufficient service life of ⁇ 100,000 printed copies per printing form is regarded as sufficient longevity.
  • the carrier plate is pretreated by means of pickling, etching, corona treatment or plasma treatment.
  • the application of the ink to the carrier plate can be carried out in the process according to the invention by means of known ink-jet techniques.
  • the ink is applied in the CIJ process (continuous ink jet process) or in the DOD process (drop-on-demand process).
  • CIJ printers are known in the field of industrial printing.
  • the ink jet exits via a nozzle from a printhead, wherein the jet modulates via a piezoelectric transducer behind the outlet nozzle in order to achieve a uniform drop in the ink drop.
  • the emerging drops are electrostatically charged via an electrode and then pass through a deflection field built up by a further electrode, within which they are deflected as a function of their charge, wherein between binary-deflecting methods and multi-deflecting method is distinguished.
  • Ink drops not needed for printing are collected and returned to the ink circuit.
  • the ink drop leaves the nozzle that is actually to be applied as a printed image.
  • the required ink drops are generated by means of a heating element which heats the ink. This explosively forms a vapor bubble, which presses an ink drop from the nozzle by its pressure.
  • a distinction is made between sideshooter systems and edgeshooter systems.
  • piezo printers a piezoceramic element is deformed by applying an electrical voltage to press ink through a die by the change in shape. The drop size can be controlled by the applied electrical pulse.
  • the ink is applied to the carrier plate with a dot density of .gtoreq.1200 dpi, preferably .gtoreq.224 dpi.
  • the ink After application to the carrier plate, the ink is fixed. This can be done by air drying. However, it may also be provided in one embodiment of the method according to the invention that the ink is fixed after application to the support plate by means of UV radiation and / or thermal radiation. This advantageously allows rapid fixation of the ink.
  • the ink comprises a silicone, a polyisoprene and / or fluoroplastic, in particular a poly (dimethylsiloxane).
  • the ink may include adjuvants such as solvents, surface tension adjusting agents in the fixed state, and / or fixing agents.
  • an UV-curable ink is used as the ink. It may be provided that the ink is free-radical curing or cationic curing. Radical curable inks use unsaturated resins having reactive groups that cause a crosslinking reaction via free radicals. In general, these are acrylated resins or monomers having acrylic acid groups (acrylic acid esters). In addition to the acrylates, other compounds having reactive double bonds, e.g. unsaturated polyester resins as well as vinylic monomers such as e.g. Styrene can be crosslinked via this mechanism.
  • photoinitiators contained in the ink spontaneously decompose into free radicals and initiate a chain reaction for the polymerization.
  • the result is a three-dimensionally crosslinked, insoluble and solid structure of macromolecules. This happens in seconds or fractions of a second, so that immediately after hardening a resilient film is created.
  • the resin base is an oxirane group-containing compound.
  • an acid is used, which is activated only by the exposure.
  • the resin component is usually a cycloaliphatic epoxy resin. The protons of the acid cause opening of the epoxide ring and initiate polymerization with continued chain growth.
  • the application of the ink to the carrier plate takes place in an inert gas atmosphere, for example in a nitrogen, carbon dioxide, helium or argon atmosphere.
  • an inert gas atmosphere for example in a nitrogen, carbon dioxide, helium or argon atmosphere.
  • This can preclude adverse oxidation reaction of the inks or the support surface with atmospheric oxygen, thereby improving the adhesion of the ink to the support plate, which in turn results in durability the pressure plate and the pressure to be reached with this increased number of copies.
  • an increased resolution can be achieved by reducing or suppressing the oxidation reactions induced by atmospheric oxygen, since an oxidatively induced fraying of the image dot edges can be avoided.
  • Inert gas atmosphere in the sense of the present invention means that the oxygen concentration in the working atmosphere is ⁇ 5 vol .-%, preferably ⁇ 1 vol .-%, particularly preferably ⁇ 0.5 vol .-%.
  • At least the ink application takes place in a low-moisture atmosphere in order to exclude disturbing influences of any residual moisture.
  • Low moisture in the sense of the invention means that the water content in the working atmosphere is ⁇ 1% by volume, preferably ⁇ 0.5% by volume, more preferably ⁇ 0.1% by volume.
  • the ink is applied in a dry inert gas atmosphere having a residual moisture content of ⁇ 0.1% by volume.
  • the above-described optional adjustment of the surface roughness R a of the carrier plate to less than 1 .mu.m in an inert gas atmosphere, in particular dry inert gas atmosphere. It is particularly preferred that moisture and / or oxygen contact of the carrier plate between the adjustment of the surface roughness and the application of the ink is avoided.
  • a silicone in particular a poly (dimethylsiloxane), a polyisoprene, in particular a poly-2-methyl-1,3-butadiene, or mixtures of these can be used as binders.
  • a short-chain hydrocarbon, N-methyl-2-pyrrolidone, toluene or a mixture thereof may be contained.
  • the dye for example, in the ink applied to the support plate, a triphenylmethane, a (4- (4,4'-bis (dimethylaminophenyl) benzhydryliden) cyclohexa-2,5-dien-1-ylidene) dimethyl ammonium chloride or a mixture of these be.
  • the ink may contain bisacylphosphine oxide and / or a benzophenone.
  • a coloring agent is added to the ink. This makes it possible to supply the printing form after its preparation of a visual inspection to detect any errors.
  • Fig. 1 shows schematically a manufacturing method according to the invention for producing a printing form 100 for the waterless offset printing.
  • an ink 200 is applied by means of an ink jet device 400.
  • the carrier plate 200 has a surface tension ⁇ 35 mN / m.
  • the material for the support plate 200 for example, aluminum, an aluminum alloy, steel, a polycarbonate, a Polyester, or serve a polyolefin.
  • the carrier plate 200 has a composite structure in which a coating is applied to a carrier layer which has a surface tension in the range according to the invention.
  • the carrier plate 200 may be subjected to a suitable surface treatment before the ink 300 is applied thereto.
  • suitable surface treatments are pickling, etching, corona treatment or plasma treatment.
  • the ink droplets 310 are applied in the areas of the carrier plate 200, which should not carry any color in later offset printing.
  • a protective gas atmosphere such as nitrogen or argon, takes place.
  • Fig. 2 schematically shows a printing plate 100 prepared according to the invention.
  • the applied ink after fixing or curing forms regions 320 having a surface tension ⁇ 30 mN / m, while the non-inked regions 210 have a surface tension ⁇ 35 mN / m exhibit.
  • area 210 carries color while areas 320 reject color.
  • the fixing of the ink 300 can be done, for example, thermally or by UV irradiation. Likewise, depending on the ink 200 used, it may be provided that it is fixed or cured by air drying.
  • Fig. 3 shows the schematic representation of a printing plate 100 on which printing ink has been applied.
  • the ink is accepted by the printing form in the region 500, while the region 320 covered by fixed or cured ink repels the ink.
  • the ink-bearing areas are transferred to the blanket cylinder of the printing machine, which then transmits the printed image to the medium to be printed.
  • Fig. 4 schematically shows a printed with a printing plate produced in the process according to the invention form medium 600.
  • the color-carrying region 500 was, as in the Fig. 3 described, transferred from the printing plate only on a blanket cylinder and then on the medium to be printed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Claims (12)

  1. Procédé de fabrication d'une plaque d'impression (100) pour l'impression offset sans mouillage, présentant les étapes de procédé :
    - mise à disposition d'une plaque support (200) ;
    - dépôt d'une encre (300) sur la plaque support (200) au moyen de la technique par jet d'encre ;
    - fixation de l'encre (300) déposée sur la plaque support,
    où la plaque support (200) présente une tension superficielle ≥ 35 mN/m, de préférence ≥ 38 mN/m et l'encre (300) présente une tension superficielle ≤ 30 mN/m, de préférence ≤ 25 mN/m, à l'état fixé sur la plaque support (200), et l'encre (300) est rapportée dans les zones de la plaque support (200), lesquelles ne doivent pas comporter de peinture d'impression dans l'impression offset, caractérisé en ce que le dépôt de l'encre (300) sur la plaque support (200) est effectué dans une atmosphère de gaz inerte avec une teneur en oxygène ≤ 5 % en volume.
  2. Procédé selon la revendication 1, dans lequel au moins la surface de la plaque support (200) est constituée d'un matériau du groupe composé de l'aluminium, d'alliages de l'aluminium, de l'acier, du polycarbonate, du polyester et de polyoléfine.
  3. Procédé selon l'une des revendications précédentes, dans lequel la plaque support (200) est prétraitée pour la modification de la rugosité de surface avant le dépôt de l'encre (300).
  4. Procédé selon la revendication 3, dans lequel la plaque support présente une rugosité de surface moyenne Ra inférieure à 1 µm.
  5. Procédé selon l'une des revendications 3 ou 4, dans lequel la plaque support (200) est prétraitée au moyen d'un décapage, d'une gravure, d'un traitement Corona ou d'un traitement par plasma.
  6. Procédé selon l'une des revendications précédentes, dans lequel l'encre (300) est fixée après le dépôt sur la plaque support (200) au moyen d'un rayonnement UV et/ou d'un rayonnement thermique.
  7. Procédé selon l'une des revendications précédentes, dans lequel l'encre présente un silicone, un polyisoprène, un acrylate, une huile de silicone, un tensioactif fluoré, une matière plastique fluorée, un phosphinoxyde bis-acylique, une benzophénone, un perfluoroalcane, un perfluorooctane sulfonate, un triphénylméthane, du diméthylammonium chlorure de (4-(4,4'-bis(diméthylamino-phényl)benzhydrylidèn) cyclohexa-2,5-dièn-1-ylidène ou une N-méthyl-2-pyrrolidone.
  8. Procédé selon la revendication 7, dans lequel l'encre présente un hydrocarbure à chaîne courte et/ou du toluène.
  9. Procédé selon l'une des revendications précédentes, dans lequel le dépôt de l'encre (300) sur la plaque support a lieu dans une atmosphère avec une teneur en humidité ≤ 1 % en volume.
  10. Procédé selon l'une des revendications précédentes, dans lequel l'humidité et/ou le contact avec l'oxygène de la plaque support sont évités entre le réglage de la rugosité de surface et le dépôt de l'encre (300).
  11. Procédé selon l'une des revendications précédentes, dans lequel l'encre (300) est apportée sur la plaque support (200) avec une densité de points ≥ 1200 dpi, de préférence ≥ 2400 dpi.
  12. Procédé selon l'une des revendications précédentes, dans lequel un produit de coloration est ajouté à l'encre (300).
EP12759664.1A 2011-08-25 2012-08-23 Procede de production d'une plaque d'impression pour l'impression offset sans mouillage Not-in-force EP2748002B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011052991A DE102011052991B4 (de) 2011-08-25 2011-08-25 Verfahren zur Herstellung einer Druckform für den wasserlosen Offsetdruck
PCT/EP2012/066433 WO2013026904A1 (fr) 2011-08-25 2012-08-23 Procede de production d'une plaque d'impression pour l'impression offset sans mouillage

Publications (2)

Publication Number Publication Date
EP2748002A1 EP2748002A1 (fr) 2014-07-02
EP2748002B1 true EP2748002B1 (fr) 2017-01-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12759664.1A Not-in-force EP2748002B1 (fr) 2011-08-25 2012-08-23 Procede de production d'une plaque d'impression pour l'impression offset sans mouillage

Country Status (8)

Country Link
US (1) US20140208969A1 (fr)
EP (1) EP2748002B1 (fr)
JP (1) JP2014528856A (fr)
KR (1) KR20140051395A (fr)
CN (1) CN103732409A (fr)
DE (1) DE102011052991B4 (fr)
RU (1) RU2014104167A (fr)
WO (1) WO2013026904A1 (fr)

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JP6686436B2 (ja) * 2014-11-11 2020-04-22 東レ株式会社 水なし平版印刷版原版、および水なし平版印刷版を用いた印刷物の製造方法
CN105818562B (zh) * 2015-01-05 2018-06-15 中国科学院化学研究所 一种水性油墨用版材及其制备方法
EP3138867B1 (fr) 2015-09-03 2019-10-02 Evonik Degussa GmbH Utilisation de polyethers d'eugenol et polyethersiloxanes d'eugenol en tant qu'agent mouillant
RU167835U1 (ru) * 2016-06-29 2017-01-10 Эркин Садыкович Артыков Устройство для изготовления офсетных печатных форм
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CN111849255A (zh) * 2020-06-12 2020-10-30 柳州市盛杰彩印有限公司 一种用于制备无水胶印印版硅胶层的组合物及其制备方法
CN111849354A (zh) * 2020-06-12 2020-10-30 柳州市盛杰彩印有限公司 一种高耐印力无水胶印印版及其制备方法
CN117863747A (zh) * 2024-01-17 2024-04-12 广州市普理司科技有限公司 一种浅墨干燥工艺及装置

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Publication number Publication date
DE102011052991A1 (de) 2013-02-28
CN103732409A (zh) 2014-04-16
WO2013026904A1 (fr) 2013-02-28
RU2014104167A (ru) 2015-09-27
US20140208969A1 (en) 2014-07-31
EP2748002A1 (fr) 2014-07-02
KR20140051395A (ko) 2014-04-30
JP2014528856A (ja) 2014-10-30
DE102011052991B4 (de) 2013-12-24

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