WO2015144844A1 - Procédé de traitement d'une bande d'aluminium, bande d'aluminium et utilisation afférente - Google Patents

Procédé de traitement d'une bande d'aluminium, bande d'aluminium et utilisation afférente Download PDF

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Publication number
WO2015144844A1
WO2015144844A1 PCT/EP2015/056630 EP2015056630W WO2015144844A1 WO 2015144844 A1 WO2015144844 A1 WO 2015144844A1 EP 2015056630 W EP2015056630 W EP 2015056630W WO 2015144844 A1 WO2015144844 A1 WO 2015144844A1
Authority
WO
WIPO (PCT)
Prior art keywords
protective layer
aluminum strip
aluminum
coated
layer
Prior art date
Application number
PCT/EP2015/056630
Other languages
German (de)
English (en)
Inventor
Andreas Siemen
Gerd Steinhoff
Bernhard Kernig
Original Assignee
Hydro Aluminium Rolled Products 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 Hydro Aluminium Rolled Products Gmbh filed Critical Hydro Aluminium Rolled Products Gmbh
Priority to EP15713443.8A priority Critical patent/EP3122567B1/fr
Priority to ES15713443.8T priority patent/ES2662913T3/es
Publication of WO2015144844A1 publication Critical patent/WO2015144844A1/fr

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
    • B41N1/04—Printing plates or foils; Materials therefor metallic
    • B41N1/08—Printing plates or foils; Materials therefor metallic for lithographic printing
    • B41N1/083—Printing plates or foils; Materials therefor metallic for lithographic printing made of aluminium or aluminium alloys or having such surface layers

Definitions

  • the invention relates to a method for processing an aluminum strip for lithographic printing plate supports, an aluminum strip for lithographic
  • Print plate carrier and a use for it.
  • an aluminum strip is first produced in the prior art, roughened by electrograining and / or anodizing and then provided on one side (upper side) with a photosensitive layer.
  • the electrograining and anodizing is used to prepare the top of the
  • Aluminum bands for subsequent coating with the photosensitive layer are Aluminum bands for subsequent coating with the photosensitive layer.
  • an alternating current is applied to the aluminum strip in an electrically conductive bath, in particular in an acidic or basic bath, so that a uniform surface is formed in the surface of the side (upper side) of the aluminum strip to be provided with the photosensitive layer
  • Trough structure forms. This leads to increased micro-roughness, which makes the surface of the aluminum strip appear dull.
  • the aluminum strip in an electrically conductive bath in particular in an acidic or basic bath, is exposed to a direct current such that an oxide layer forms on the granular upper side, which hardens the surface of the aluminum strip.
  • this electrochemical treatment of the aluminum strip i. electrograining and / or anodizing, commonly referred to as roughening.
  • roughening is the top of the
  • lithographic printing plate support called.
  • a photosensitive layer is applied to the surface prepared by the roughening. After application of the photosensitive layer, the photosensitive layer
  • the printing plates are then typically stacked one above the other, with one paper liner interposed between two printing plates.
  • the paper liners protect the photosensitive layer and, on the other hand, enable a subsequent trimming of the printing plate stack with guillotine shears.
  • Printing plate manufacturer has long been the desire to omit the paper liner.
  • the object of the present invention is to provide a method which on the one hand avoids the problems caused by the paper liners and, on the other hand, reduces the costs for the paper
  • Printing plate manufacturer can be reduced.
  • This object is achieved according to the invention by a method for processing an aluminum strip for lithographic printing plate supports with the following steps: Providing an aluminum strip for lithographic printing plate supports, one-sided coating of the aluminum strip with a protective layer.
  • the aluminum strip is preferably roughened
  • Aluminum bands by, for example, electrograining and / or anodizing.
  • the protective layer can already be made immediately after the production of the aluminum strip, in particular by the
  • a uniform depression structure is introduced into the upper side of the aluminum strip so that a grained aluminum strip of an un-grained aluminum strip is formed by the presence or absence of the aluminum strip
  • the un-granular state of an aluminum strip is thus understood to mean, in particular, that a hollow structure caused by electrograining in the surface of the side of the aluminum strip, that of the protective layer
  • the top of the aluminum strip is provided with an oxide layer. While a natural oxide layer on aluminum strips may have a thickness of up to 100 nm, in particular up to 20 nm, the oxide layers applied by anodization have a significantly greater thickness of at least 400 nm. By the presence or the thickness of the oxide layer Aluminum strips differ in the anodized and unanodized state.
  • the aluminum band is especially on the bottom (back) with the
  • the upper side of the aluminum strip is understood to mean the side which is provided for coating with the photosensitive layer. Under the underside of the aluminum strip is understood accordingly the other side of the aluminum strip.
  • the aluminum ribbon for lithographic printing plate supports is preferably provided in final thickness, so that it no longer has to be rolled off after one-sided coating with a protective layer.
  • the coating of the aluminum strip with the protective layer preferably takes place after one
  • Roll aftertreatment of the aluminum strip Such a rolling aftertreatment may include, for example, degreasing and / or stretching.
  • the aluminum strip can be prepared for coating, in particular degreased.
  • the protective layer is not damaged by the rolling aftertreatment, if this is done before.
  • the coating takes place substantially immediately before the coiling of the aluminum strip to a coil, in particular before a transport for further processing into printing plates, in particular before a transport to the printing plate manufacturer.
  • an aluminum strip for lithographic printing plate support in particular produced with the method described above, wherein the aluminum strip has a one-sided protective layer.
  • the aluminum strip is an aluminum strip for lithographic printing plate supports, i. the aluminum strip has in particular one for the
  • the aluminum strip is in particular in unaufgerauhtem state, in particular in ungrafted and / or unanodized state.
  • aluminum tape is preferably in a state before it is roughened to apply the photosensitive layer, for example, by electrograining and / or anodizing. Such granulation and / or
  • Anodization steps are performed in the manufacture of printing plates to prepare the aluminum tape surface for the application of a photosensitive layer and are usually made directly by the printing plate manufacturer.
  • roughening of the top of the aluminum strip takes place as
  • the protective layer is applied to the aluminum strip by extrusion coating, hot lamination of foils or by applying a lacquer, in particular a UV-curing lacquer or a solvent-based lacquer. - -
  • Suitable lacquers are, in particular, plastics dissolved in solvents, for example PVC copolymers dissolved in ketone.
  • One embodiment is a paint having the following composition:
  • epoxy paints come into consideration.
  • the protective layer is preferably produced with a PVC copolymer and / or an epoxy lacquer or preferably comprises a PVC copolymer and / or an epoxy lacquer or an epoxy resin.
  • the protective layer may also be made by hot lamination with a polyolefin film,
  • polyethylene film are produced or comprises a polyolefin film, in particular polyethylene film.
  • a matting agent for example finely divided silica, may be added to the paint. In this way, a frosting of the otherwise smooth
  • the protective layer can essentially consist of or comprise a polymer material, in particular a resin.
  • a polymer material in particular a resin.
  • Protective layer comprises one or more of the following components: polyolefins, in particular polyethylenes (PE), polypropylenes (PP), polybutylenes, polybutadienes and / or polyisoprenes, polyamides (PA), polyurethanes (PU), polyimides, polysiloxanes, polyesters, polycarbonates (PC) , Polyvinyl acetals, polyvinyl chlorides (PVC),
  • PVDC Polyvinylidene chlorides
  • PET polyethylene terephthalates
  • PS polystyrenes
  • acrylates in particular homopolymers or copolymers of or with alkyl acrylates or alkyl methacrylates, in particular methacrylates, in particular -.
  • the protective layer comprises or consists essentially of an electron beam or UV-curing resin.
  • the protective layer may in particular contain additives such as plasticizers, colorants such as pigments, silicones, matting agents and / or
  • the protective layer preferably has a layer thickness of 1 to 50 ⁇ m, preferably 1 to 10 ⁇ m. These layer thicknesses have proven to be suitable in order to be able to dispense with paper interlayers between the printing plate carriers. The layer thicknesses relate in each case to the thickness of the protective layer after drying.
  • the protective layer is a partial protective layer, preferably with a coverage in the range of 10 to 95%, preferably in the range of 30% to 90%, in particular in the range of 40% to 70%.
  • a partial protective layer is understood to mean a protective layer which is not continuous over the entire surface but has uncoated regions, for example in the form of recesses in the protective layer.
  • the partial protective layer may be formed, for example, as a grid-like or net-like protective layer.
  • the protective layer may have a rhomboid geometry.
  • a partial protective layer allows a better flow of current to the aluminum strip during anodization, since in particular a current flow through the recesses of the protective layer is made possible, for example by direct contacting of the aluminum strip with a roller used for anodizing. , ,
  • a partial protective layer has the advantage that the
  • the protective layer preferably has a layer thickness of at least 1 ⁇ , preferably at least 5 ⁇ on.
  • the layer thicknesses relate in each case to the thickness of the protective layer after drying. Under the degree of coverage of the protective layer, the area fraction of the
  • the coated area occupies 60% of the total area and the
  • Recesses of the protective layer occupy 40% of the total area.
  • the protective layer can be applied, for example, in gravure printing or in high-pressure printing, for example in flexographic printing.
  • a screened roller can be used.
  • gravure printing for example, a paint applied to the screened roller and excess paint can be removed with a doctor, so that the paint remains only in the wells of the roller. Subsequently, the paint can be used as a partial coating on the
  • Hot lamination applied to a film may be a partial protective layer
  • protective layers may also be provided with reduced layer thickness.
  • protective layers may also be provided with reduced layer thickness.
  • the protective layer therefore has areas with reduced layer thickness, the areas preferably - - are designed to provide air cushion for superposed printing plates available.
  • An electrically insulating coating on the underside of the aluminum strip can, during a subsequent electrochemical treatment of the upper side (in particular electrograining and / or anodization), produce a so-called current encasement, i. a border-side spreading of the current flow on the bottom, prevent. In this way, a more uniform electrochemical treatment of the top is possible, in particular a more uniform roughening. In addition, so can the
  • an edge-side continuous protective layer region for example of at least 10 mm width, is preferably provided in order to achieve the advantages described above.
  • the paint is preferably dried thermally,
  • an indirect convection method in particular using a heat exchanger, is preferably used to prevent contamination of the aluminum strip by soot from a gas burner or the like. to avoid.
  • the drying of the paint takes place in such a way that the maximum
  • Maximum Temperature - PMT in the range 232-280 ° C, preferably 260-280 ° C, is located. Due to the minimum temperature of the PMT of 232 ° C, preferably 260 ° C, such drying and / or crosslinking of the protective layer is achieved that a later migration of constituents of the protective layer, for example in the
  • UV-curing or electron beam-curing lacquer it is also possible to use UV-curing or electron beam-curing lacquer. The curing can then after application to the
  • stamped films may be used to achieve a partial protective layer.
  • recesses holes
  • recesses can be punched into the film, which form the recesses of the protective layer after application to the aluminum strip.
  • the provision of an aluminum strip for lithographic printing plate supports comprises the following steps:
  • the aluminum strip can still one
  • Rolling after-treatment which comprises at least one or more, preferably all, of the following steps;
  • AA 5xxx in particular AA 1050, AA 1100, AA 1110, AA 1200 A or AA 3103. These alloys are particularly suitable for printing plate carriers.
  • the method further comprises at least one, preferably several, in particular all, of the following steps, preferably in this order:
  • an additional surface treatment can be carried out to increase the hydrophilicity of the surface, preferably after the anodization, for example by means of an aqueous silicate solution or an aqueous solution with phosphates and fluorides.
  • the above-described steps are carried out on the one-sided protective layer coated aluminum tape, i. after the aluminum strip has been coated on one side with the protective layer.
  • the alkaline etching can be carried out, for example, in an aqueous NaOH solution,
  • a 5% aqueous NaOH solution for example for 10 s at a temperature of 80 ° C.
  • the electrograining can be carried out, for example, with alternating current in an HCl and / or HNO 3 solution, for example a 1% HCl / HNO 3 solution, for example for less than 60 s at 40 ° C. -
  • anodizing the aluminum strip is preferably with a high
  • the current flow on the aluminum strip surface may, for example, be more than 500 A / m 2 , in some cases even more than 1000 A / m 2 , for example with a power transmission in the range above 10 kW / m 2 , in particular 10 to 50 kW / m 2 .
  • the anodization is preferably carried out in an acid bath, for example a sulfuric acid bath. During power transmission temperatures of, for example, more than 100 ° C. can be achieved on the copper roller.
  • a drying step for this layer can take place.
  • the drying of the photosensitive layer is carried out at a temperature of less than 150 ° C, for example by means of a floating dryer. In this way, damage to the protective layer can be prevented.
  • the protective layer is conductive. In this way, a better current transmission or a better resistance of the protective layer can be achieved during anodizing.
  • the protective layer comprises at least one electrically conductive
  • Polymer in particular one or more of the following components: polythiophene, polypyrrole, polyacetylene, polyaniline, polyparaphenylene or mixtures thereof.
  • the protective layer may also contain additives for increasing the conductivity, for example metal particles, carbon particles such as, for example, carbon black or mixtures thereof.
  • the protective layer is resistant to alkaline etching, electrograining, and / or the anodization process.
  • the protective layer is against 5% aqueous NaOH solutions and 1% - -
  • the protective layer is preferably temperature-resistant up to at least 100 ° C. In this way, damage to the protective layer by the etching, electrograining and / or anodizing can be reduced or prevented.
  • the aluminum tape coated with a photosensitive layer is tabulated to printing plates.
  • the protective layer before clamping the printing plate in a printing system, in particular before
  • Print plate carrier with the following steps:
  • Solvent based on the aluminum strip is applied. , ,
  • the protective layer is a partial protective layer, preferably with a coverage in the range of 10 to 95%, preferably in the range of 30% to 90%,
  • an aluminum strip by strip casting and optionally hot rolling or by hot rolling an aluminum billet, cold rolling the aluminum strip to a final thickness in the range of 0.05 to 1 mm, preferably 0.1 to 0.5 mm.
  • Aluminum strip for lithographic printing plate supports in particular producible by the method according to one of embodiments 1 to 8, wherein the aluminum strip has a one-sided protective layer.
  • Fig. 2 shows a first embodiment of the invention
  • Fig. 4 shows a stack of printing plates, made of the in Fig. 2 or from the aluminum strip shown in Fig. 3.
  • Fig. 1 shows a flowchart of an embodiment of the method according to the invention.
  • an aluminum ribbon for lithographic printing plate supports is provided. This can, for example, by hot and cold rolling a
  • Walzbarrens made of an alloy of type AA 1100 done.
  • the provided aluminum tape has an upper surface, which is provided for later coating with a photosensitive layer, and a lower side.
  • protective layer for example by applying a lacquer layer of PVC copolymer.
  • the applied protective layer is dried, for example by passing the aluminum strip through a drying oven.
  • the aluminum strip can be unwound, for example, into a coil and provided for the printing plate carrier production, in particular by delivery to a manufacturer for
  • Print plate carrier or for printing plates are examples of Print plate carrier or for printing plates.
  • the aluminum strip is subjected to one or more chemical and / or electrochemical treatments, in particular one
  • a photosensitive layer is applied to the upper surface of the aluminum strip.
  • the aluminum strip can be divided into individual printing plates.
  • the printing plates produced in this way can be without paper liner to arrange stacks one above the other, wherein the protective layer is the object of
  • Fig. 2 shows a first embodiment of the aluminum strip according to the invention in cross section.
  • the aluminum strip 20 consists of one for lithographic
  • Print plate support suitable alloy for example, type AA 1100.
  • the aluminum strip 20 has an upper surface 22, which is provided for a coating with a photosensitive layer, and a bottom 24 on.
  • Bottom 24 of the aluminum strip 20 is provided with a protective layer 26 of a PVC copolymer or epoxy resin.
  • the aluminum strip 20 is provided with the protective layer 26 before the top (electro) chemically treated, in particular anodized and / or elektrogekörnt. Accordingly, the
  • Fig. 3a-b show a second embodiment of the invention
  • Fig. 3a shows a cross section and Fig. 3b shows a view from below.
  • the aluminum strip 30 also consists of one for lithographic
  • Printing plate support suitable alloy for example, type AA 1100, and has a provided for later coating with a photosensitive layer top 32, and a bottom 34, which is provided with a protective layer 36.
  • the protective layer 36 is a partial protective layer having recesses 38. Through the recesses 38 can for the
  • Recesses 38 areas with a reduced layer thickness 40 may be provided. - -
  • the recesses 38 and the areas with reduced layer thickness 40 are present diamond-shaped. However, they can also have a different shape.
  • the recesses 38 are preferably arranged so that the edge of a
  • Fig. 4 shows a stack of printing plates.
  • the pressure plates 50 may be made, for example, from the aluminum strip 20 shown in FIG. 2 or from the aluminum strip 30 shown in FIG. 3a-b.
  • the printing plates 50 accordingly each have an aluminum layer 52, the underside of which is provided with a protective layer 54.
  • the upper surface of the aluminum layer 52 is provided with a photosensitive layer 56.
  • the printing plates 50 are stacked on top of one another so that the protective layer 54 of a printing plate 50 lies on top of the printing plate underneath or a photosensitive layer 56 applied thereon.
  • Photosensitive layers 56 are protected in this manner by the protective layers 54 from damage by the overlying printing plate, so that additional paper liners between the individual printing plates are dispensable.
  • the protective layers 54 have recesses (corresponding to the recesses 38 in FIG. 3 a) or regions with a reduced layer thickness (corresponding to the regions 40 in FIG. 3 a), air cushions are formed between the pressure plates 50 so that they can be easily separated again from one another ,
  • the finished protective layer had a layer thickness of 5 ⁇ .
  • the samples were visually inspected for damage.
  • the patterns showed no infiltration, peeling or dissolution of the protective layer. Even otherwise, there were no visible changes to the protective layer, such as discoloration or clouding. This shows that the protective layer can be applied before the (electro) chemical treatment of the aluminum strip, in particular before the electrograining or anodizing, since the protective layer survives the (electro) chemical treatment without damage.
  • the protective layer and the photosensitive layer can therefore be excluded.
  • the top or a photosensitive layer applied there is sufficiently protected by the protective layer of the overlying plate, so that can be dispensed with paper interleaves.
  • Aluminum bands can occur to a coil. This makes it possible, in particular, to store and / or transport the aluminum strips provided with a protective layer as a coil without damaging the upper side of the aluminum strip as a result of the pressures in the coil.

Landscapes

  • Printing Plates And Materials Therefor (AREA)

Abstract

L'invention concerne un procédé de traitement d'une bande d'aluminium (20, 30) destinée à un support de plaque d'impression lithographique, comprenant les étapes suivantes : la préparation d'une bande d'aluminium (20, 30) pour support de plaque d'impression lithographique; et le revêtement de la bande d'aluminium par une couche de protection (26, 36) sur une face, la bande d'aluminium (20, 30) étant revêtue de la couche de protection (26, 36) à l'état non granulé et/ou non anodisé. L'invention concerne par ailleurs une bande d'aluminium (20, 30) destinée à un support de plaque d'impression lithographique, la bande d'aluminium (20, 30) présentant une couche de protection (26, 36) sur une face et étant présente à l'état non granulé et/ou non anodisé.
PCT/EP2015/056630 2014-03-27 2015-03-26 Procédé de traitement d'une bande d'aluminium, bande d'aluminium et utilisation afférente WO2015144844A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15713443.8A EP3122567B1 (fr) 2014-03-27 2015-03-26 Procédé de traitement d'une bande d'aluminium, bande d'aluminium et utilisation afférente
ES15713443.8T ES2662913T3 (es) 2014-03-27 2015-03-26 Procedimiento para procesar una banda de aluminio, banda de aluminio y su utilización

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014004360 2014-03-27
DE102014004360.6 2014-03-27

Publications (1)

Publication Number Publication Date
WO2015144844A1 true WO2015144844A1 (fr) 2015-10-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/056630 WO2015144844A1 (fr) 2014-03-27 2015-03-26 Procédé de traitement d'une bande d'aluminium, bande d'aluminium et utilisation afférente

Country Status (3)

Country Link
EP (1) EP3122567B1 (fr)
ES (1) ES2662913T3 (fr)
WO (1) WO2015144844A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634412A1 (de) * 1975-08-01 1977-02-10 Fuji Photo Film Co Ltd Lithographische druckplatte
EP0495755A1 (fr) * 1991-01-11 1992-07-22 Alusuisse-Lonza Services Ag Surfaces en aluminium
WO1997019819A1 (fr) * 1995-11-24 1997-06-05 Horsell Graphic Industries Limited Support hydrophylise pour plaques d'impression planographique et sa preparation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634412A1 (de) * 1975-08-01 1977-02-10 Fuji Photo Film Co Ltd Lithographische druckplatte
EP0495755A1 (fr) * 1991-01-11 1992-07-22 Alusuisse-Lonza Services Ag Surfaces en aluminium
WO1997019819A1 (fr) * 1995-11-24 1997-06-05 Horsell Graphic Industries Limited Support hydrophylise pour plaques d'impression planographique et sa preparation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CECCHETTO ET AL: "Emeraldine base as corrosion protective layer on aluminium alloy AA5182, effect of the surface microstructure", CORROSION SCIENCE, OXFORD, GB, vol. 49, no. 2, 30 November 2006 (2006-11-30), pages 818 - 829, XP005786622, ISSN: 0010-938X, DOI: 10.1016/J.CORSCI.2006.06.012 *

Also Published As

Publication number Publication date
ES2662913T3 (es) 2018-04-10
EP3122567A1 (fr) 2017-02-01
EP3122567B1 (fr) 2018-02-28

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