EP1228864B1 - Procédé de fabrication d'une plaque d'impression - Google Patents

Procédé de fabrication d'une plaque d'impression Download PDF

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Publication number
EP1228864B1
EP1228864B1 EP01201770A EP01201770A EP1228864B1 EP 1228864 B1 EP1228864 B1 EP 1228864B1 EP 01201770 A EP01201770 A EP 01201770A EP 01201770 A EP01201770 A EP 01201770A EP 1228864 B1 EP1228864 B1 EP 1228864B1
Authority
EP
European Patent Office
Prior art keywords
plate
printing
laser beam
polymeric
basic
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.)
Revoked
Application number
EP01201770A
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German (de)
English (en)
Other versions
EP1228864A1 (fr
Inventor
Hessel Martijn Houtstra
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HOUTSTRA MANAGEMENT & BEHEER B.V.
Original Assignee
Houtstra Management & Beheer Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Houtstra Management & Beheer Bv filed Critical Houtstra Management & Beheer Bv
Publication of EP1228864A1 publication Critical patent/EP1228864A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • 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
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • 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
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/22—Curved printing plates, especially cylinders made of other substances

Definitions

  • the present invention relates to a method for making a printing plate. More in particular the invention relates to a method for making a printing plate from a basic plate, which printing plate is suitable for flexographic printing and in which the basic plate is engraved by means of a laser beam.
  • the basic plate which in accordance with the patent is used for making a flexographic printing plate, consists of several layers, each of a specific composition, and applied onto a backing layer. With the aid of an infrared laser a desired printing image (pattern) is formed on the plate, so that the exposed parts will be cured. In a subsequent processing step the entire plate is heated by means of a special device and the unexposed parts are removed from the thus processed plate. The parts treated with the infrared laser remain as printing image on the plate.
  • a first disadvantage is that various steps are required to make the basic plate, because it consists of several layers. Then the basic plate has to be provided with a desired pattern by means of a laser, and finally the unexposed parts of the plate have to be removed. These various steps make the manufacture of such a flexographic printing plate laborious, time consuming and expensive. This method is not often used in practice.
  • a not completely cured photopolymer plate (“green plate”) is exposed through a negative of a printing image to be formed on the plate, so that the printing parts of the plate are cured.
  • the green plate is provided with a so-called slip-sheet coating to ensure static positioning of the negative on the green plate.
  • the slip-sheet coating must subsequently be removed.
  • the unexposed and thus uncured parts of the plate are washed off together with the slip-sheet coating.
  • the plate is then dried and post exposed and, often in the same processing step, an anti- tack treatment is carried out with the aid of UVC lamps.
  • US-A-5 259 311 discloses a method for laser engraving of a photopolymer printing plate, said method comprising the steps of exposing rear and front surfaces of said printing plate to UV light for curing a backing and an upper layer thereof; removing a release layer from said printing plate; laser engraving a particular pattern in the front surface of said printing plate; and, removing surface tack and hardening said front surface of said photopolymer printing plate.
  • US-A-5 798 202 discloses a process for making a flexographic printing plate which involves reinforcing and laser engraving a printing element said element comprising a flexible support and a laser engravable, reinforced elastomeric layer.
  • An object of the present invention is to provide an improved method for making a flexographic printing plate.
  • a more specific object is to provide a method wherein the above-mentioned disadvantages do not occur.
  • an improved method for making a printing plate as described in the preamble is obtained, characterized in accordance with claim 1.
  • a plate is first completely cured, for example, by thoroughly exposing the entire plate to radiation of a suitable wavelength in order to completely polymerize the material.
  • the anti- tack treatment is carried out by UVC-light radiation.
  • a person skilled in the art is quite capable of carrying out such curing of the plate.
  • the slip-sheet coating (if present) has to be removed. After that, the non-printing part may be removed from the surface with the aid of the laser.
  • the anti- tack treatment in accordance with the invention is carried out prior to the laser treatment, particles that are loosened during the.laser treatment will not simply adhere to the surface of the plate. A later treatment to remove the particles is therefore not necessary.
  • the method according to the invention is carried out on a completely cured photopolymeric printing plate fabricated in one step, and which is immediately ready for laser treatment.
  • a plane bottom surface of a m old is provided with a removable sheet material over which subsequently a substantially liquid, still to be cured, starting material for the photopolymer plate is poured.
  • the removable sheet material must not adhere to the photopolymer when the latter is being cured (photopolymerized).
  • the liquid starting material is distributed with the aid of a doctor blade or the like to obtain a uniform thickness. After that a backing layer is applied to adhere to the photopolymer.
  • said backing layer is provided with an adhesive that adheres very well to the cured polymer.
  • this treatment may be performed by applying pressure.
  • a plate may be used made of material that is permeable to curing radiation, e.g. if curing is performed with the aid of UV radiation it may be a glass plate, which glass plate will at the same time form a top surface of the m old .
  • Curing may occur from both sides of the m old simultaneously.
  • a considerable advantage of the present invention is that the anti- tack treatment may be carried out simultaneously with the curing of the material, preferably using UVC light.
  • Another advantage compared to the present-day methods is that in accordance with this preferred method of the invention, no slip-sheet coating is applied. This is economical with respect to the use of chemicals, which are necessary in the technique for the removal of the slip-sheet coating.
  • a simple basic plate made for example, from a polymer or a copolymer such as a photopolymer, and which is completely cured, with a suitable laser beam in order to remove parts from the surface of said plate.
  • a suitable laser beam in order to remove parts from the surface of said plate.
  • a traditional and known laser suitable for carrying out the present method a CO 2 laser, is certainly able to achieve a Didot screen of 60.
  • a Didot screen of 40-60 is usual (a Didot screen of 56 corresponds with a screen of 150 lpi (lines per inch)).
  • air extraction is used during laser engraving, producing an airflow above and in the vicinity of the surface treated with the laser, such as to extract gases being released by the laser, and possibly material particles. This prevents particles that loosened by the laser become burnt into the plate.
  • a supplementary rotating soft brush may be used to remove particles that have unexpectedly been left on the plate.
  • the bristles of the brush should have a hard ness such that these do not damage or otherwise negatively affect the material surface of the photopolymer printing plate.
  • the particles will then be removed by the extractor.
  • the extractor may be integrated in the brush.
  • the extractor system optionally comprises a filter, for example an activated carbon filter.
  • a filter for example an activated carbon filter.
  • a laser that according to the invention produces good results is a laser that, while irradiating the plate material, is capable of removing part of the surface of that material.
  • a laser examples of such a laser are CO 2 or YAG lasers.
  • the power of the laser greatly depends on the material to be engraved, e.g. the type of material, but also the depth of penetration, the engraving speed and the size of the printing plate.
  • the power consumed will generally range from 10-3000 watt, preferably from 20-1000 watt, more preferably from 25-500 watt.
  • a CO 2 laser With a photopolymeric printing plate of A2 format, a CO 2 laser will generally have a power consumption ranging from 25-250 watt.
  • the flexographic printing plate as obtained with the aid of the method according to the present invention is in the printing process applied to a cylinder, which is then rolled over a surface to be printed. Due to the plate being bent, the pattern will become slightly distorted compared with the printing plate in the flat configuration; it may therefore be preferred to engrave the flexographic printing plate by means of the laser beam while the same is on the cylinder and has assumed the final configuration for its employment in the printing process. In this way it is possible to apply an undistorted printing pattern to a substrate. For that matter, it is also possible while designing the printing pattern or while forming the printing image on the plate when it lies flat, to compensate the distortion of the plate resulting when applying the same around a cylinder. Preferably the distortion factors to be applied are incorporated in the software of the laser-engraving machine. It is then very easy to perform the laser engraving process on a fixed cylinder.
  • the cured polymer plate may be applied around the printing cylinder prior to laser engraving.
  • the printing plate may be attached to the printing cylinder by means of an adhesive bond, but it is also possible to affix the printing plate on a sleeve, which after the printing plate has been laser-engraved, may be slid over a printing cylinder. At the same time, such a sleeve endows the printing plate with sufficient rigidity for further handling and for applying it tautly around a cylinder. This is generally known in the art.
  • the position of the printing image on the printing cylinder can be determined precisely by the software of the engraving machine. In the case of polychromatic (i.e.
  • multicolour) printing for example when printing in six colours, six printing cylinders are required, each with a separate printing image. Thanks to the software of, for example, the engraving machine, the position of each of the printing images on the printing cylinder is exactly known, so that it is no longer necessary to individually register (i.e. aligning) the printing plates on the printing cylinders.
  • the printing plates have to be register ed on the printing cylinders manually or with the aid of very costly machines. This is very time-consuming.
  • a further advantage is that the currently used register symbols, which are provided on a printing plate next to the printing pattern, may be omitted. This makes a saving in printing plate material possible.
  • a printing plate which exhibits a difference in height between the printing and the non-printing parts.
  • This height may be adapted as desired, the height being determined chiefly by the type of material to be printed, as well as by the type of printing plate material.
  • the plate thickness will vary from 0.5 to 10 mm.
  • a plate thickness from 0.76 to 6.35 mm is preferred.
  • the height of the relief may vary from 0.4 to 9.9 mm.
  • a height of 0.66 to 6.15 mm is preferred.
  • the hardness of the printing plate may also vary within a wide range. In particular, the hardness will range from 30 to 70° Shore A.
  • the material being used for the printing plate has to be suitable for the intended purpose.
  • the plate must be flexible enough to be able to apply it, if desired, around a printing cylinder.
  • the material must exhibit a suitable affinity with the printing ink, the material of the printing plate, at least the printing parts, having to become thoroughly wetted by the printing ink.
  • Different kinds of printing ink, of different compositions may render it necessary for the printing plate to be made of a specific material. It is possible to use the materials that are used according to the prior art manufacture of flexographic printing plates.
  • Preferred materials are radiation-curable materials, for example, materials that can be crossed-linked by radiation and/or polymerizable materials.
  • Radiation-curable materials generally comprise a binding agent, a photoinitiator or a photoinitiator system, and a radiation-curable component that may be at least one of (a) a low-molecular monomer or oligomer that is polymerizable, (b) reactive groups pendant to the binding agent and suitable to interact, or (c) reactive groups pendant to the binding agent and a cross-linking agent capable of reacting with the reactive groups.
  • binding agent comprises polymers and copolymers of acrylates or methacrylates
  • the photoinitiator system is a system that, when exposed to actinic radiation, will form compounds that will initiate either a free-radical reaction or a cationogenic cross-linking or polimerization reaction.
  • Actinic radiation refers to high-energy radiation including, but not limited to, UV, electron, X-ray, and visible radiation.
  • Photoinitiator systems for the free-radical reactions are generally known in the art, and do not need to be depicted here. This holds true also for the photoinitiator systems that are suitable for cationogenic cross-linking or polymerisation reactions. It is also possible to add sensitizing agents to the polymerizable material from which the basic plate is made. Sensitizing agents are generally speaking materials that absorb wavelengths other than the wavelengths absorbed by the reaction initiator. The sensitizing agents are then able to transmit the absorbed energy to the reaction initiator. The addition of sensitizing agents therefore allows the wavelength of the activation radiation to be controlled.
  • a printing plate according to the invention has to have a uniform thickness. Since the printing plate is cured in its entirety, it is easy to fulfil this requirement.
  • the manufacture of uniformly thick plates of a polymer material is generally known in the art.
  • the printing plate must also allow excellent wetting with the printing ink.
  • By a correct choice of starting materials it is possible to provide a suitable interaction with practically any printing ink usable in flexography. To this end it is necessary for the material of the printing plate to allow proper wetting with the printing ink as mentioned before, but also to allow a uniform transfer of the ink to the substrate to be printed.
  • the printing plate is preferably also wear-resistant. This makes it possible to use the printing plate for a long time. Moreover, the quality of the print will remain unchanged.
  • the printing plate has to be made from a material that can be engraved by means of a laser in a manner such that a precise pattern can be applied to the surface in order to transfer by means of a printing process, for example, a fine screen pattern onto the substrate to be printed.
  • a printing plate can be formed with a laser, wherein the laser removes the non-printing parts from the surface of the plate.
  • the dep t h of the relief can be easily controlled.
  • the laser can very simply be controlled directly by means of a digital system in which it is possible to have a simple coupling between a program for designing a pattern for the printing plate, and the laser. A person skilled in the art of computer programming is quite capable of doing this.
  • the dep t h of the relief can be simply controlled by adjusting the intensity of the laser and/or the length of time the laser is allowed to act on a particular position on the plate. It is also very simple to adjust the s houlder .
  • the present invention makes it possible to produce a flexographic printing plate of excellent quality in far fewer steps than were necessary up till now. In addition, fewer materials are necessary for the manufacture of the plate. Firstly, no negative is needed for the exposure of the plate, secondly, the plate no longer needs to be etched with chemicals and no lengthy drying times and/or extra exposures are necessary. It is also no longer necessary to afterwards treat or dispose of the chemicals used in the prior art.
  • the plate does not need to be held with grips or clamps during engraving, as was common practice until now.
  • the result is a not inconsiderable savings, possibly up to 5%, in plate material.
  • the plate is immediately ready for printing. This is an advantage over the printing plates produced in accordance with the known methods, in which the same have undergone a number of treatments with liquids. These materials will absorb a quantity of liquid causing them to swell. The materials according to the prior art will have to dry in order to loose the absorbed liquid.
  • An additional drawback of the known materials is that after drying they may exhibit a difference in thickness.
  • the method according to the invention therefore provides a vastly improved method for making printing plates for flexographic printing.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Claims (12)

  1. Procédé de fabrication d'une plaque d'impression à partir d'une plaque de base pour l'impression par flexographie, dans lequel la plaque de base est gravée au moyen d'un faisceau laser, caractérisé en ce que la plaque de base comprend un matériau acrylate ou méthacrylate polymère durci et dans lequel au moins une partie de la surface de la plaque de base est enlevée par le faisceau laser jusqu'à une profondeur de 0,4 à 9,9 mm.
  2. Procédé selon la revendication 1, caractérisé en ce que les parties qui ne sont pas des parties d'impression sont enlevées de la surface de la plaque de base par le faisceau laser.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le faisceau laser est un laser à dioxyde de carbone ou un laser YAG.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce que la plaque de base est faite d'un matériau flexible.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la plaque est faite d'un matériau obtenu par photopolymérisation.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la plaque est une plaque polymère complètement durcie.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que durant le gravage, la plaque de base est montée autour d'un cylindre permanent, d'un cylindre d'impression amovible, ou d'un manchon amovible.
  8. Procédé selon la revendication 7, caractérisé en ce qu'un manchon amovible est muni à sa surface du matériau polymère durci.
  9. Procédé selon la revendication 1, caractérisé en ce que la plaque de base est constituée d'un manchon qui est muni d'une couche de matériau polymère durci ; au moins une partie de la surface de la couche de matériau polymère est enlevée par le faisceau laser ; et dans lequel le manchon ainsi traité peut être placé sur un cylindre d'impression.
  10. Procédé selon la revendication 9, caractérisé en ce que le manchon ainsi traité peut être positionné sur un cylindre d'impression sans besoin ultérieur d'aligner le cylindre d'impression.
  11. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que celui-ci comprend en outre les étapes suivantes :
    a) fournir une première surface de moule sensiblement plane, éventuellement munie d'un film amovible ;
    b) appliquer sur la surface du moule une couche de matériau de départ acrylate ou méthacrylate polymère durcissable par polymérisation, sensiblement liquide ;
    c) fournir une couche de support sur la couche de matériau de départ acrylate ou méthacrylate polymère ;
    d) mettre en contact de façon intime au moyen de pression la couche liquide et la couche de support en plaçant sur la couche de support une seconde surface de moule, de façon à ce que le matériau de départ acrylate ou méthacrylate polymère soit couvert sur les deux faces par la première ou la seconde surface de moule respectivement ;
       la première et la seconde surface de moule étant perméables aux radiations de durcissement ; et
    e) exposer par les deux surfaces de moule le matériau de départ acrylate ou méthacrylate polymère aux radiations de durcissement afin de polymériser ledit matériau de départ acrylate ou méthacrylate polymère, de façon à former une plaque polymère, et à mener simultanément un traitement anti-collant ;
       de façon à ce que la polymérisation effectue l'adhésion entre la couche de support et la plaque polymère.
  12. Plaque d'impression obtenue par un procédé selon l'une quelconque des revendications 1 à 10, dans lequel une surface d'une plaque de base comprenant un matériau d'acrylate ou de méthacrylate polymérisé est gravée au moyen d'un faisceau laser, moyennant quoi les parties traitées avec le faisceau laser sont enlevées de la surface de la plaque de base, jusqu'à une profondeur de 0,4 à 9,9 mm.
EP01201770A 2000-05-12 2001-05-14 Procédé de fabrication d'une plaque d'impression Revoked EP1228864B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1015180A NL1015180C2 (nl) 2000-05-12 2000-05-12 Werkwijze voor het vervaardigen van een drukplaat.
NL1015180 2000-05-12

Publications (2)

Publication Number Publication Date
EP1228864A1 EP1228864A1 (fr) 2002-08-07
EP1228864B1 true EP1228864B1 (fr) 2004-04-14

Family

ID=19771366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01201770A Revoked EP1228864B1 (fr) 2000-05-12 2001-05-14 Procédé de fabrication d'une plaque d'impression

Country Status (6)

Country Link
EP (1) EP1228864B1 (fr)
AT (1) ATE264190T1 (fr)
DE (2) DE60102790T2 (fr)
ES (1) ES2231384T3 (fr)
NL (1) NL1015180C2 (fr)
TR (1) TR200401712T4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011126737A2 (fr) 2010-03-29 2011-10-13 Eastman Kodak Company Précurseurs d'impression flexographique et procédés pour les préparer

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1529637A1 (fr) * 2003-10-30 2005-05-11 Houtstra Management & Beheer B.V. Element pourant être gravé par laser pour la preparation d'une plaque d'impression flexographique, d'un tampon manuel ou d'un tampon pour le codage
US7947426B2 (en) 2008-02-25 2011-05-24 Eastman Kodak Company Laser-engraveable flexographic printing plate precursors
US9156299B2 (en) 2011-06-30 2015-10-13 Eastman Kodak Company Laser-imageable flexographic printing precursors and methods of imaging
US8900507B2 (en) 2011-06-30 2014-12-02 Eastman Kodak Company Laser-imageable flexographic printing precursors and methods of imaging
US9156241B2 (en) 2011-12-12 2015-10-13 Eastman Kodak Company Laser-imageable flexographic printing precursors and methods of relief imaging
US9266316B2 (en) 2012-01-18 2016-02-23 Eastman Kodak Company Dual-layer laser-imageable flexographic printing precursors
US9522523B2 (en) 2012-04-30 2016-12-20 Eastman Kodak Company Laser-imageable flexographic printing precursors and methods of imaging

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5798202A (en) * 1992-05-11 1998-08-25 E. I. Dupont De Nemours And Company Laser engravable single-layer flexographic printing element
US5259311A (en) * 1992-07-15 1993-11-09 Mark/Trece Inc. Laser engraving of photopolymer printing plates
DE4339010C2 (de) * 1993-06-25 2000-05-18 Pt Sub Inc Photohärtbares Erzeugnis für Druckplatten
US5860360A (en) * 1996-12-04 1999-01-19 Day International, Inc. Replaceable printing sleeve
US5840463A (en) * 1997-07-14 1998-11-24 E. I. Du Pont De Nemours And Company Photosensitive donor element assemblages and associated process for laser-induced thermal transfer
US6326127B1 (en) * 1998-12-31 2001-12-04 Kraton Polymers U.S. Llc Photo-curable polymer composition and flexographic printing plates containing the same
US6159659A (en) * 1999-04-26 2000-12-12 Creo Srl Method for processless flexographic printing and flexographic printing plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011126737A2 (fr) 2010-03-29 2011-10-13 Eastman Kodak Company Précurseurs d'impression flexographique et procédés pour les préparer

Also Published As

Publication number Publication date
DE60102790D1 (de) 2004-05-19
ATE264190T1 (de) 2004-04-15
NL1015180C2 (nl) 2001-11-15
TR200401712T4 (tr) 2004-09-21
DE60102790T2 (de) 2005-03-31
EP1228864A1 (fr) 2002-08-07
DE1228864T1 (de) 2003-06-26
ES2231384T3 (es) 2005-05-16

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