EP1330367A1 - Procede pour ameliorer la qualite d'impression de machines a imprimer - Google Patents

Procede pour ameliorer la qualite d'impression de machines a imprimer

Info

Publication number
EP1330367A1
EP1330367A1 EP00983043A EP00983043A EP1330367A1 EP 1330367 A1 EP1330367 A1 EP 1330367A1 EP 00983043 A EP00983043 A EP 00983043A EP 00983043 A EP00983043 A EP 00983043A EP 1330367 A1 EP1330367 A1 EP 1330367A1
Authority
EP
European Patent Office
Prior art keywords
coating
ink
substances
printing
cleaning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00983043A
Other languages
German (de)
English (en)
Inventor
Rüdiger Nass
Leopold Sudau
Manfred Hornschuh
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.)
Nanogate GmbH
Original Assignee
Nanogate GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanogate GmbH filed Critical Nanogate GmbH
Publication of EP1330367A1 publication Critical patent/EP1330367A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • 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

Definitions

  • the present invention is concerned with methods, devices and fabrics as used in particular for printing.
  • Ink is then transferred to the printing material by pression, for which purpose a softer impression cylinder, the impression roller, is moved against the printing cylinder with the printing material arranged in between. It is important that the color transfer takes place primarily by means of pression, since the surface tensions of the forme cylinder and the color are relatively the same. It is also important that the color is achieved by means of pigments which are transported in fluid and incorporated in resins, waxes and other fillers. These are volatile and leave the pigments behind in many areas of the printing press, which leads to undesirable and sometimes difficult-to-remove residues.
  • the color is transferred from the printing parts of the printing plate, which are in one plane with the non-printing, by means of pression.
  • fat-repellent areas are created on a printing plate as non-printing areas, a greasy ink is applied with application rollers to a compressible rubber blanket stretched on a steel cylinder, and this is then pressed under pressure onto the printing material that rests on the impression cylinder.
  • the surface tension of the blanket of the plate and the color are relatively the same in level.
  • Another printing process discussed is the flexographic or high-pressure process, in which a printing block made of flexible material such as rubber or the like is used.
  • the printing block is created by deliberately removing areas that are not to be printed.
  • the raised picture elements can then be colored, for which purpose color is given under pressure against the printing block.
  • an anilox roller which is a small cylinder, in the surface of which wells are incorporated in a homogeneous arrangement, which are hammered into a copper matrix using diamond or burned into a ceramic layer by laser and are so small that their opening area is smaller than the smallest raster dot still to be printed. With these rollers, too, it is known that negative changes occur due to the color.
  • the non-printing sections which do not absorb any color are coated with an inorganic polycondensate and / or a hydrophobicizing agent for surface treatment, which contains as an active component a silane in which an at least partially fluorinated organic group is bonded to silicon via a saturated radical, and / or self-crosslinking aqueous preparations of resins containing low-strength perfluoroalkyl groups, the surface tension of which is coated Color adhesion is prevented and the color is transferred to the printing sections directly by spraying.
  • an inorganic polycondensate and / or a hydrophobicizing agent for surface treatment which contains as an active component a silane in which an at least partially fluorinated organic group is bonded to silicon via a saturated radical, and / or self-crosslinking aqueous preparations of resins containing low-strength perfluoroalkyl groups, the surface tension of which is coated Color adhesion is prevented and the color is transferred to the printing sections directly by spraying.
  • a disadvantage of the invention described in the prior art is that the paint is sprayed on. So that the sometimes very complex cleaning of the rollers and the like. Parts in contact with ink simplified or avoided, but massive changes are required for existing printing systems. When planning new systems, such massive changes have to be implemented, which is required but also there, a turn away from systems that have long been tried and tested and thus have developed in terms of design.
  • the object of the present invention is to provide something new for commercial use.
  • the surface energies of the surfaces coming into contact with the ink on the way from the pressure vessel to the material to be printed are set at least at some transition points such that the transfer of the ink from one surface to the next is longitudinal of the ink transport path is promoted.
  • This adjustment of the surface energy can be achieved in particular by coating the parts involved, which are adjacent to one another during operation, for example.
  • a coating composition with very low surface energy is known for example from EP 0 587 667 B1.
  • the main claim of this pre-published document specifies an organometallic coating composition which has a group perfluorinated with an average of 5 to 30 fluoroaromatic atoms which are bonded to one or more aliphatic carbon atoms which are separated from M by at least two atoms.
  • Such a coating composition has a low surface energy.
  • the surface energy of the resulting composition or of the surfaces treated with the composition increases, and the more, the fewer fluorine atoms are exchanged.
  • the surface energies are typically between 10mJ / m 2 and 80mJ / m 2 are set, preferably between 15mJ / m 2 and 70mJ / m 2 .
  • a coating composition although this is preferred, a corresponding coating can also be provided, which brings the desired surface properties.
  • a coating can be inflated with little stretch and pulled onto the roller. Particles can be incorporated into this coating, which increase wear resistance and abrasion resistance.
  • Protection is also claimed for a coating composition based on polycondensates of one or more hydrolyzable compounds of at least one element M from the main groups III to V and subgroups II to IV of the periodic table, at least some of these compounds in addition to the hydrolyzable groups A also contains non-hydrolyzable carbon-containing groups B and the total molar ratio of groups A to groups B in the underlying monomeric starting compounds is 10: 1 to 1: 2, with groups B being groups B, for a predetermined proportion of the composition, which averaged 5 to 30 have fluorine atoms which are bonded to one or more aliphatic carbon atoms which are separated from M by at least two atoms, and where, in a second proportion of the composition, the groups B are groups B ⁇ which are selected such that a higher surface energy for this e results which is over 25 mJ / m 2 , in particular over 60 ⁇ t ⁇ J / m 2 .
  • the lower value of 25 mJ / in 2 differs comparatively little from that of highly fluorinated composition proportions, which allows fine adjustment, while the second higher value creates a wider range of adjustment options.
  • the surface energy of the second portion can also be higher, for example 70 or 80 mJ / 2 .
  • particles which can be heated can be introduced into the coating, preferably nanoparticles which remain in the coating. If the particles are heated by high-frequency alternating electromagnetic fields, the entire layer also heats up. In this way, the composition can be cured without having to warm up the entire roller.
  • the coating can also be heated with a sufficiently powerful hot air blower designed for achieving sufficiently high temperatures and / or an infrared light source.
  • the surface energies by coating and / or coating can be set according to the invention, for example for the ink container, the hoses, etc., but it is preferred if, in particular, the anilox rollers, etc. have a surface with the surface energy set. Please note the following: It is not important that the entire anilox roller is completely coated. Rather, it is considered is considered sufficient if the "wells" are coated. This is because the webs running between the wells are sanded free of paint residues by the constant contact with abrasive paint moved over them and the material pressed against the anilox roller.
  • rollers do not have smooth surfaces but are roughened, whether by chrome plating with hard chrome plating, by sandblasting or other blasting.
  • the sealing can be carried out with a solution which contains no fluorosilane, which has the advantage that the local micelle formation in the pores is reliably avoided and the sealing is improved.
  • nanoparticles and active binding phases can be contained according to the invention.
  • a solution which contains the following components: silica sol, silica esters which are hydrolyzed or partially hydrolyzed and / or condensed and / or organically modified silica esters, the organic modification being effected by groups which couple of the monomer, which is applied later to achieve the surface properties.
  • the consequence of the hydrolyzing, condensing, etc. of the silicic acid compound is that, firstly, the pores can be better closed and secondly, a chemically stable connection to the substrate, for example chromium dioxide, as can be found on chromium-plated surfaces of printing machines.
  • Yttrium salts or nanoparticles ITO, ATO, FTO or metal particles in nanosize can be used as nanoparticles, which can also be contained in the sealing solution. These can impart antistatic properties. Other nanoparticles can also be used. The reason for using nanoparticles is that the bulk component shrinks when drying, which would result in cracks again after penetrating the pores to be filled. The nanoparticles prevent cracking
  • bonds form on the one hand between the metal surface and the monomer and, on the other hand, under the condensing monomer molecules, so that there is at least partial crosslinking on the surface, which increases the resistance of the coating formed from the layer produced by the monomer elevated. It is preferred that the "f. -.
  • the monomer can be used activated or not activated.
  • the activation takes place by installing / converting reactive groups, which can be done, for example, by adding water or the like to the monomer.
  • Fluorine compounds are conceivable as monomers here, in particular with the following properties: silicon-bonded perfluorinated groups with 2C atoms spacer spacing, the use of fluorinated Si compounds having the advantage that particularly durable coatings result, specifically due to the fact that bonds form between Si and the surface metal hydroxide and this leads to very good three-dimensional crosslinking of the monomers.
  • fluorinated compounds it is preferred to use aliphatic, long-chain or to use cyclic aliphatic or aromatic compounds. It is preferred to use CF2-
  • any monomer or fluoropolymer is used, however, crosslinking of the monomer or polymer between the rods may result. In other words, these may not be kept separate from one another, but may be “glued” together, which is undesirable.
  • the reaction of the monomer or oligomer with one another is preferred in one variant compared to the reaction with the rubber (rubber) reduced to a practically insignificant extent by using monomers with thyol groups, which preferentially form connections to the rubber, so that the coating sits primarily and dominantly on the rubber sticks, so that the sticks do not stick together.
  • the print quality by also coating the inside of the cups on the cups of an anilox roller, which is possible with the invention using sufficiently low-viscosity solutions or starting substances for the coating.
  • the inner coating improves the print image considerably because it accumulates vpn color residues in the individual bowl is prevented and / or reduced, so that the transferable color quantity remains larger.
  • the antistatic properties can be achieved by adding an yttrium salt or the nanoparticles ITO, ATO, FTO or metal particles in nano size.
  • anilox roller cups are coated with a coating that runs closely to the wall. This ensures that the scooping volume is not reduced very much.
  • the nanoparticles that are particularly preferred to be provided in a primer solution when a multilayer system is built up also penetrate into capillary cracks in the roller ceramic and thus seal them.
  • an electrostatic coating in particular of a primary sealing layer, ie to spray the coating electrostatically so that a particularly good penetration takes place.
  • the roller structure as it is typically used must be observed, with a hollow roller on which the ceramic layer lies on the outside in the layer structure.
  • the inner part of the hollow roller can then represent the opposite pole.
  • the required electrostatic properties of the coating can be shaped and achieved by nanoparticles / structures with groups capable of dissociation, in particular OH groups, the charge dissociation resulting in charge separation and chargeability.
  • a porous roller can preferably be coated in the moistened state.
  • the moistening can in particular be carried out with the same solvent as is used for the coating composition.
  • the consequence of the moistening is that solvent penetrates into the capillaries of the porous ceramic. If the coating dries out, the solvent will evaporate away from the coating surface. It cannot be avoided that solvent remains in the capillaries of the anilox roller, since the capillary forces are greater than the vapor pressure of the solvent. Then, when the coating is heated for the purpose of curing or the like, the vapor pressure of the solvent remaining in the capillaries rises so much that vapor is formed. With conventional coatings, this may not be able to escape because the surface drying is vapor-tight. In contrast to this, in the coatings used with nanostructures and / or particles there is in any case sufficient porosity to enable the solvent residues to evaporate from the capillaries without the surface of the already hardened or at least hardened coating material bursting open.
  • a roller of a printing machine provided with a warped chrome structure is coated with a coating in accordance with EP 0587 667 B1.
  • the result is a Drcuk roller that covers the first 14 Operating days do not have to be cleaned and can then be easily cleaned with an oil rag for about half a year. This is attributed to the good transferability of the color due to the changed surface energy.
  • rollers If no unused rollers are coated, but already operated ones, e.g. long after a previous coating, they must be cleaned. This cleaning is known per se in the prior art. It is possible to use sand, baking powder, shot peening, cryos, corona, ultrasound, etc. Furthermore, the laser scanners known from aircraft paint stripping can be used. Because of the fine well structures, anilox rollers can also be cleaned by blasting with nanopowder to be conducted in particular in an at least quasi-closed circuit. The cleaned rollers can then be coated.

Landscapes

  • Printing Methods (AREA)

Abstract

L'invention concerne un procédé pour améliorer la qualité d'impression et/ou allonger la durée d'utilisation de machines à imprimer. A cet effet, les énergies superficielles des surfaces venant en contact avec l'encre sur le trajet compris entre le réservoir sous pression et le matériau à imprimer sont réglées au moins au niveau de quelques points de jonction de façon à favoriser le transfert de l'encre d'une surface à la suivante le long du trajet de transport de l'encre.
EP00983043A 2000-10-18 2000-10-19 Procede pour ameliorer la qualite d'impression de machines a imprimer Withdrawn EP1330367A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10051795 2000-10-18
DE10051795 2000-10-18
PCT/DE2000/003684 WO2002032689A1 (fr) 2000-10-18 2000-10-19 Procede pour ameliorer la qualite d'impression de machines a imprimer

Publications (1)

Publication Number Publication Date
EP1330367A1 true EP1330367A1 (fr) 2003-07-30

Family

ID=7660303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00983043A Withdrawn EP1330367A1 (fr) 2000-10-18 2000-10-19 Procede pour ameliorer la qualite d'impression de machines a imprimer

Country Status (4)

Country Link
EP (1) EP1330367A1 (fr)
AU (1) AU2001219947A1 (fr)
DE (1) DE10085237D2 (fr)
WO (1) WO2002032689A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754979A (en) * 1970-05-01 1973-08-28 Du Pont Line resolution in screen printing
US4198739A (en) * 1976-05-19 1980-04-22 Rodel, Inc. Printing roller with polymeric coner and method of making the same
JPH01139297A (ja) * 1987-11-26 1989-05-31 Mitsubishi Heavy Ind Ltd 印刷機ローラー表面のインキ汚れ防止方法
JP3146599B2 (ja) * 1992-03-23 2001-03-19 大日本インキ化学工業株式会社 印刷用ブランケットの表面改質方法及び印刷用ブランケット
CA2102347A1 (fr) * 1993-06-16 1994-12-17 Howard W. Demoore Couchage a faible affinite pour presses rotatives offset

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0232689A1 *

Also Published As

Publication number Publication date
WO2002032689A1 (fr) 2002-04-25
DE10085237D2 (de) 2003-10-02
AU2001219947A1 (en) 2002-04-29

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