EP0291760A2 - Printing plate supports and process and apparatus for their manufacture - Google Patents

Printing plate supports and process and apparatus for their manufacture Download PDF

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Publication number
EP0291760A2
EP0291760A2 EP88107060A EP88107060A EP0291760A2 EP 0291760 A2 EP0291760 A2 EP 0291760A2 EP 88107060 A EP88107060 A EP 88107060A EP 88107060 A EP88107060 A EP 88107060A EP 0291760 A2 EP0291760 A2 EP 0291760A2
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EP
European Patent Office
Prior art keywords
electrolyte
band
printing plate
electrode
electrodes
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Withdrawn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
EP88107060A
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German (de)
French (fr)
Other versions
EP0291760A3 (en
Inventor
Heinz Dipl.-Ing. Börgerding
Joachim Dipl.-Ing. Stroszynski
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.)
Hoechst AG
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Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of EP0291760A2 publication Critical patent/EP0291760A2/en
Publication of EP0291760A3 publication Critical patent/EP0291760A3/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/02—Etching
    • C25F3/04—Etching of light metals
    • 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
    • B41N3/034—Chemical or electrical pretreatment characterised by the electrochemical treatment of the aluminum support, e.g. anodisation, electro-graining; Sealing of the anodised layer; Treatment of the anodic layer with inorganic compounds; Colouring of the anodic layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S204/00—Chemistry: electrical and wave energy
    • Y10S204/09—Wave forms

Definitions

  • the invention relates to a roughened printing plate carrier and to a method and an apparatus for producing the carrier.
  • the supports consisting of metals, preferably of aluminum or its alloys, are roughened in most cases.
  • such carrier plates mechanically, for. B. by grinding with an abrasive or by brushing, chemical, e.g. B. with an acid, or electrochemically in electrolytic solutions.
  • a combination of the described processes also belongs to the prior art.
  • the electrochemical roughening z. B. asymmetrical alternating current or preferably sinusoidal alternating current, the electrolyte, for.
  • hydrochloric or nitric acid the concentration of the electrolyte, the current density, the temperature and other parameters can be varied, with different surface structures.
  • the task is solved by printing plate supports made of aluminum or its alloys, which have tubular depressions in an even distribution and a bright surface.
  • the depressions are free of loose layers. Good printing qualities are thus achieved by the invention through the printing plates coated, exposed and developed with light-sensitive layers.
  • the present invention also relates to a method for roughening printing plate supports which are used to produce printing plates coated, exposed and developed with photosensitive layers.
  • the process is based on electrochemical roughening - possibly followed by anodic oxidation - of plates made of aluminum or its alloys in acidic electrolytes.
  • the process is then characterized in that the roughening is carried out by means of pulsed direct current.
  • the process can be carried out in such a way that it is carried out in two stages, the composition of the electrolytes being selected differently, the parameters of the current inputs and outputs being set identically in mirror image. If the process is varied, the contact process is used.
  • the invention also relates to a device for carrying out the method, the polarized electrodes being arranged in one or more electrolyte baths.
  • the contact method uses a device whose characteristic feature is that one electrode is arranged outside the electrolyte bath and is in direct contact with the strip to be treated and the other electrode (s) in the electrolyte bath (s) -baths) is (are) arranged.
  • the electrodes arranged in the (or the) electrolyte are preferably arranged at a distance of 2 to 25 mm from the band to be treated.

Abstract

A grained printing plate support made of aluminium or its alloys has uniformly distributed, tubular recesses. A process for manufacturing the printing plate support in which graining is carried out in an acidic electrolyte by means of pulsating direct current is also claimed. …<??>The invention also relates to a suitable apparatus for carrying out the process. …<IMAGE>…

Description

Die Erfindung betrifft einen aufgerauhten Druckplatten­träger sowie ein Verfahren und eine Vorrichtung zur Herstellung des Trägers.The invention relates to a roughened printing plate carrier and to a method and an apparatus for producing the carrier.

Zur Herstellung von Druckplatten werden die aus Metal­len, vorzugsweise aus Aluminium oder dessen Legierungen, bestehenden Träger in den meisten Fällen aufgerauht. So ist es Stand der Technik, solche Trägerplatten mecha­nisch, z. B. durch Schleifen mit einem abrasiven Mittel oder durch Bürsten, chemisch, z. B. mit einer Säure, oder elektrochemisch in Elektrolytlösungen aufzurauhen. Auch eine Kombination der geschilderten Verfahren gehört zum Stand der Technik. Bei der elektrochemischen Aufrau­hung wird z. B. asymmetrischer Wechselstrom oder bevor­zugt sinusförmiger Wechselstrom eingesetzt, wobei der Elektrolyt, z. B. Salz- oder Salpetersäure, die Konzen­tration des Elektrolyten, die Stromdichte, die Tempera­tur und andere Parameter variiert werden können, wobei verschiedene Oberflächenstrukturen entstehen.For the production of printing plates, the supports consisting of metals, preferably of aluminum or its alloys, are roughened in most cases. So it is state of the art, such carrier plates mechanically, for. B. by grinding with an abrasive or by brushing, chemical, e.g. B. with an acid, or electrochemically in electrolytic solutions. A combination of the described processes also belongs to the prior art. In the electrochemical roughening z. B. asymmetrical alternating current or preferably sinusoidal alternating current, the electrolyte, for. As hydrochloric or nitric acid, the concentration of the electrolyte, the current density, the temperature and other parameters can be varied, with different surface structures.

Die Verwendung von sinusförmigem Wechselstrom ist jedoch nicht optimal in bezug auf Stromeinwirkung und -ausbeute, da die Halbwellen symmetrisch sind.However, the use of sinusoidal alternating current is not optimal in terms of current impact and current efficiency, since the half waves are symmetrical.

Es stellte sich somit die Aufgabe, ein Aufrauhverfahren zur Herstellung von Druckplattenträgern zu schaffen, bei dem die Nachteile der bisherigen Verfahren hinsichtlich der Druckqualität nicht auftreten.It was therefore the task of creating a roughening process for the production of printing plate supports which the disadvantages of the previous methods in terms of print quality do not occur.

Gelöst wird die gestellte Aufgabe durch Druckplatten­träger aus Aluminium oder dessen Legierungen, die röh­renförmige Vertiefungen in gleichmäßiger Verteilung und eine helle Oberfläche aufweisen. Hierbei sind die Ver­tiefungen frei von losen Schichten. Durch die Erfindung werden somit gute Druckqualitäten durch die mit licht­empfindlichen Schichten beschichteten, belichteten und entwickelten Druckplatten erzielt.The task is solved by printing plate supports made of aluminum or its alloys, which have tubular depressions in an even distribution and a bright surface. Here, the depressions are free of loose layers. Good printing qualities are thus achieved by the invention through the printing plates coated, exposed and developed with light-sensitive layers.

Die vorliegende Erfindung betrifft auch ein Verfahren zur Aufrauhung von Druckplattenträgern, die zur Herstel­lung von mit lichtempfindlichen Schichten beschichteten, belichteten und entwickelten Druckplatten dienen.The present invention also relates to a method for roughening printing plate supports which are used to produce printing plates coated, exposed and developed with photosensitive layers.

Das Verfahren geht aus von einer elektrochemischen Auf­rauhung - gegebenenfalls mit anschließender anodischer Oxidation - von Platten aus Aluminium oder dessen Legie­rungen in sauren Elektrolyten. Das Verfahren ist dann dadurch gekennzeichnet, daß man die Aufrauhung mittels gepulstem Gleichstrom vornimmt. Das Verfahren kann der­art durchgeführt werden, daß es zweistufig erfolgt, wo­bei die Zusammensetzung der Elektrolyten unterschiedlich gewählt wird, wobei man die Parameter der Stromein- und -ausgänge spiegelbildlich gleich einstellt. Bei einer Variation des Verfahrens wird im Kontaktverfahren gear­beitet.The process is based on electrochemical roughening - possibly followed by anodic oxidation - of plates made of aluminum or its alloys in acidic electrolytes. The process is then characterized in that the roughening is carried out by means of pulsed direct current. The process can be carried out in such a way that it is carried out in two stages, the composition of the electrolytes being selected differently, the parameters of the current inputs and outputs being set identically in mirror image. If the process is varied, the contact process is used.

Die Verwendung von gepulstem Gleichstrom zum Ätzen von Kondensatorfolien ist aus der EP-A 0 054 990 bekannt. Es war jedoch überraschend, daß ein solches Verfahren auch zur Herstellung von Druckplattenträgern geeignet ist, da bei der Herstellung von Druckplatten und Kondensatoren an sich bekannte und unterschiedliche Voraussetzungen, z. B. einerseits die Haftung für die lichtempfindliche Schicht und Druckqualität (z. B. Verhinderung des Tonens) und andererseits Kapazitätsbedingungen eine Rolle spie­len.The use of pulsed direct current for etching capacitor foils is known from EP-A 0 054 990. However, it was surprising that such a method is also suitable for the production of printing plate supports, since known and different requirements, e.g. B. on the one hand the liability for the light-sensitive layer and print quality (e.g. prevention of toning) and on the other hand capacity conditions play a role.

Die Erfindung betrifft außerdem eine Vorrichtung zur Durchführung des Verfahrens, wobei die gepolten Elek­troden in einem oder in mehreren Elektrolytbädern an­geordnet sind.The invention also relates to a device for carrying out the method, the polarized electrodes being arranged in one or more electrolyte baths.

Bei dem Kontaktverfahren wird eine Vorrichtung verwen­det, deren kennzeichnendes Merkmal darin besteht, daß eine Elektrode außerhalb des Elektrolytbades angeordnet ist und in direktem Kontakt mit dem zu behandelnden Band steht und die andere(n) Elektrode(n) in dem (oder den) Elektrolytbad (-bädern) angeordnet ist (sind). Die in dem (oder den) Elektrolyten angeordneten Elektroden sind bevorzugt im Abstand von 2 bis 25 mm von dem zu behandelnden Band angeordnet.The contact method uses a device whose characteristic feature is that one electrode is arranged outside the electrolyte bath and is in direct contact with the strip to be treated and the other electrode (s) in the electrolyte bath (s) -baths) is (are) arranged. The electrodes arranged in the (or the) electrolyte are preferably arranged at a distance of 2 to 25 mm from the band to be treated.

Die Vorrichtung und der Gleichstromverlauf sind in den folgenden Abbildungen dargestellt, ohne daß jedoch eine Einschränkung hierauf bestehen soll.

  • Abb. 1a zeigt schematisch in Seitenansicht die Anord­nung von zwei Elektroden (1a, 1b), die in der Wanne (2), in der sich der Elektrolyt (3) be­findet, angeordnet sind. Das Band (4) ist un­terhalb der Elektroden angeordnet.
  • Abb. 1b zeigt die Gleichstromeinstellung (A) in Abhän­gigkeit von den Zeiten (t).
  • Abb. 2a zeigt eine Vorrichtung entsprechend Abb. 1, nur daß hier die Elektroden (1a, 1b) in zwei Wannen (2a, 2b) angeordnet sind.
  • Abb. 2b zeigt die zugehörige Gleichstromeinstellung.
  • Abb. 3a zeigt schematisch in Seitenansicht eine Vor­richtung zur Durchführung des Kontaktverfah­rens. In der Wanne (2) befindet sich der Elektrolyt (3). Über dem Band (4) ist die Elektrode (1a), außerhalb der Wanne (2) die Elektrode (1b) (hier als Walzenelektrode abgebildet) im Kontakt mit dem Band (4) angeordnet.
  • Abb. 3b zeigt den Gleichstromverlauf in Abhängigkeit von den Zeiten (t).
The device and the direct current curve are shown in the following figures, but there is no intention that this should be a limitation.
  • Fig. 1a shows a schematic side view of the arrangement of two electrodes (1a, 1b), which are arranged in the trough (2) in which the electrolyte (3) is located. The band (4) is arranged below the electrodes.
  • Fig. 1b shows the direct current setting (A) depending on the times (t).
  • Fig. 2a shows a device corresponding to Fig. 1, only that the electrodes (1a, 1b) are arranged in two tubs (2a, 2b).
  • Fig. 2b shows the associated DC setting.
  • Fig. 3a shows a schematic side view of a device for performing the contact method. The electrolyte (3) is located in the tub (2). The electrode (1a) is arranged above the band (4), the electrode (1b) (shown here as a roller electrode) outside the trough (2) in contact with the band (4).
  • Fig. 3b shows the direct current curve as a function of the times (t).

Claims (8)

1. Aufgerauhtes Druckplattenträgermaterial aus Aluminium oder dessen Legierungen, dadurch gekennzeichnet, daß es röhrenförmige Vertiefungen in gleichmäßiger Ver­teilung und eine helle Oberfläche aufweist.1. Roughened printing plate support material made of aluminum or its alloys, characterized in that it has tubular depressions in an even distribution and a bright surface. 2. Verfahren zur Herstellung eines Trägermaterials nach Anspruch 1, wobei man das Material elektrochemisch in einem sauren Elektrolyten aufrauht, dadurch gekenn­zeichnet, daß man mittels gepulstem Gleichstrom auf­rauht.2. A method for producing a carrier material according to claim 1, wherein the material is roughened electrochemically in an acidic electrolyte, characterized in that roughening by means of pulsed direct current. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man in wenigstens zwei hintereinandergeschalteten Bä­dern aufrauht, wobei man Elektrolyte mit unterschied­licher Zusammensetzung einsetzt und die Parameter der Stromein- und -ausgänge spiegelbildlich gleich einstellt.3. The method according to claim 2, characterized in that roughening in at least two series-connected baths, wherein electrolytes are used with different compositions and the parameters of the current inputs and outputs set mirror image the same. 4. Verfahren nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß man im Kontaktverfahren arbeitet.4. The method according to any one of claims 2 or 3, characterized in that one works in the contact method. 5. Vorrichtung zur Durchführung des Verfahrens nach ei­nem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß man das Band (4) durch eine oder mehrere Wannen (2a, 2b) führt, in der (denen) sich jeweils ein Elek­trolyt (3) befindet und die Elektroden (1a, 1b) in geringem Abstand vom Band (4) angeordnet sind.5. Apparatus for performing the method according to one of claims 2 or 3, characterized in that the band (4) through one or more troughs (2a, 2b), in which (which) there is an electrolyte (3) and the electrodes (1a, 1b) are arranged at a short distance from the band (4). 6. Vorrichtung zur Durchführung des Verfahrens nach An­spruch 4, dadurch gekennzeichnet, daß man das Band (4) durch wenigstens eine Wanne (2) führt, in der ein Elektrolyt (3) angeordnet ist und in geringem Abstand zum Band (4) im Elektrolyten (3) eine Elek­trode (1a) angeordnet ist und außerhalb der Wanne (2) die entsprechende Elektrode (1b) das Band (4) kontak­tiert.6. Apparatus for carrying out the method according to claim 4, characterized in that the band (4) passes through at least one trough (2) in which an electrolyte (3) is arranged and at a short distance from the band (4) in the electrolyte (3) an electrode (1a) is arranged and outside the tub (2) the corresponding electrode (1b) contacts the band (4). 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Elektrode (1b) als Walzenelektrode ausgebil­det ist.7. The device according to claim 6, characterized in that the electrode (1b) is designed as a roller electrode. 8. Vorrichtung nach Anspruch 5 bis 7, dadurch gekenn­zeichnet, daß die sich im Elektrolyten befindlichen Elektroden (1) vom Band (4) in einem Abstand von 2 bis 25 mm angeordnet sind.8. Apparatus according to claim 5 to 7, characterized in that the electrodes (1) located in the electrolyte from the belt (4) are arranged at a distance of 2 to 25 mm.
EP88107060A 1987-05-12 1988-05-03 Printing plate supports and process and apparatus for their manufacture Withdrawn EP0291760A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873715791 DE3715791A1 (en) 1987-05-12 1987-05-12 PRINT PLATE CARRIERS AND METHOD AND DEVICE FOR THE PRODUCTION THEREOF
DE3715791 1987-05-12

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EP0291760A2 true EP0291760A2 (en) 1988-11-23
EP0291760A3 EP0291760A3 (en) 1989-04-26

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EP88107060A Withdrawn EP0291760A3 (en) 1987-05-12 1988-05-03 Printing plate supports and process and apparatus for their manufacture

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EP (1) EP0291760A3 (en)
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