EP0007233A1 - Procédé de traitement de feuilles d'aluminium on de plaques lithographiques et produits obtenus de cette mainère - Google Patents

Procédé de traitement de feuilles d'aluminium on de plaques lithographiques et produits obtenus de cette mainère Download PDF

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Publication number
EP0007233A1
EP0007233A1 EP79301377A EP79301377A EP0007233A1 EP 0007233 A1 EP0007233 A1 EP 0007233A1 EP 79301377 A EP79301377 A EP 79301377A EP 79301377 A EP79301377 A EP 79301377A EP 0007233 A1 EP0007233 A1 EP 0007233A1
Authority
EP
European Patent Office
Prior art keywords
bath
aluminium
anodising
printing plate
lithographic printing
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.)
Granted
Application number
EP79301377A
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German (de)
English (en)
Other versions
EP0007233B1 (fr
Inventor
Alan Thomas
David Philip Rowlands
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Priority to AT79301377T priority Critical patent/ATE926T1/de
Publication of EP0007233A1 publication Critical patent/EP0007233A1/fr
Application granted granted Critical
Publication of EP0007233B1 publication Critical patent/EP0007233B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/16—Pretreatment, e.g. desmutting
    • 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

Definitions

  • This invention relates to the treatment of aluminium (including its alloys); especially aluminium foil in continuous web form. Primarily, but not exclusively, it is concerned with the pre-treatment of aluminium that is subsequently to be coated with photosensitive material to make a p resensitised lithographic printing plate.
  • Aluminium for this purpose is almost always anodised, generally using a bath based on sulphuric acid, though phosphoric acid is used by at least one manufacturer.
  • Sulphuric acid gives a hard, adherent and abrasion-resistant coating, but there are problems in getting satisfactory adhesion of some attractive sensitive coatings (for example polyvinyl cinnamate among negative-working coatings and orthoquinone diazide sulphonate-based resists amongst positive-working coatings).
  • Phosphoric acid anodising gives much better adhesion with these and sane other coatings, but the anodic coating is much softer and tends to abrade away during printing to an extent that may limit the number of copies that can be taken off the plate.
  • the invention is based in part on the realisation that anodic oxidation takes place at the surface of the metal, not of the coating, and that it will not of itself destroy the existing exposed surface of the coating.
  • a process of treating aluminium comprising anodising it in a bath containing sulphate ions is characterised by first immersing it in a bath containing phosphate ions.
  • Immersion may be by dipping or, with some advantages, by spraying or flooding the surface of the aluminium.
  • the phosphate ions are preferably orthophosphate ions, but more complex phosphates can be used.
  • the phosphate and sulphate ions may be the only anions present to any substantial extent in the respective baths, but the presence of other anions that are inert or that modify, rather than radically alter., the effect of the treatment may be present.
  • the presence of minor amounts of sulphate in the phosphate bath and/or of phosphate in the sulphate .bath is not excluded.
  • the associated cations should be wholly or mainly hydrogen ions, but neutral or alkaline salt solutions may be suitable in some cases.
  • the phosphate treatment may be by a simple immersion process, or the aluminium surface may be subjected to anodising treatment in the phosphate bath asrwell as in the sulphate bath.
  • the phosphate bath should serve also as a "liquid junction" cell for introducing anodising current into the web without the use of contact rolls or the like; in this case the aluminium will be electrolytically etched in the phosphate bath.
  • the accompanying drawing shows the distinctive part of apparatus in which a web of aluminium foil 1 is passed, on the run, through a first bath 2 containing 45% aqueous orthophosphoric acid and, with or without intermediate washing (not shown), through a second bath 3 containing 15% sulphuric acid.
  • Current is supplied from a conventional power pack and flows between an inert anode 4 immersed in the first bath and an inert cathode 5 immersed in the second bath via both the electrolytes and the part 6 of the aluminium web extending between the two baths.
  • the bath temperatures are both around 20° C
  • the applied potential is about 16.5 V
  • the mean current density at each of the immersed length of the foil is about 200 Am- 2 .
  • the line speed is such that the dwell time in each bath is approximately four minutes.
  • the anodised web After washing and drying the anodised web is coated with a proprietary positive-working lithographic resist comprising a resin sensitised with the 2, 4 dihydroxybenzophenone ester of 1, 2, 5 diazo naphthol sulphonic acid and coloured with a blue dye to yield presensitised plates with excellent adhesion and press life compared with the best current commercial anodised- aluminium presensitised lighographic printing plates.
  • the anodic coating is thin compared with conventional coatings, and penetration of dye into the coating is not significant.
EP79301377A 1978-07-13 1979-07-12 Procédé de traitement de feuilles d'aluminium on de plaques lithographiques et produits obtenus de cette mainère Expired EP0007233B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79301377T ATE926T1 (de) 1978-07-13 1979-07-12 Verfahren zur behandlung von aluminiumfolien oder flachdruckplatten sowie die so erhaltenen produkte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2970578 1978-07-13
GB7829705 1978-07-13

Publications (2)

Publication Number Publication Date
EP0007233A1 true EP0007233A1 (fr) 1980-01-23
EP0007233B1 EP0007233B1 (fr) 1982-04-28

Family

ID=10498399

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301377A Expired EP0007233B1 (fr) 1978-07-13 1979-07-12 Procédé de traitement de feuilles d'aluminium on de plaques lithographiques et produits obtenus de cette mainère

Country Status (3)

Country Link
EP (1) EP0007233B1 (fr)
AT (1) ATE926T1 (fr)
DE (1) DE2962623D1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396470A (en) * 1980-10-23 1983-08-02 Vickers P.L.C. Lithographic printing plates
EP0121880A1 (fr) * 1983-04-07 1984-10-17 Hoechst Aktiengesellschaft Procédé en deux pas pour la préparation de matériaux anodisés d'aluminium en forme plane et leur utilisation dans la fabrication de planches à imprimer offset
US4554216A (en) * 1982-02-23 1985-11-19 Hoechst Aktiengesellschaft Process for manufacturing support materials for offset printing plates
US4554057A (en) * 1982-02-23 1985-11-19 Hoechst Aktiengesellschaft Process for manufacturing support materials for offset printing plates
US4605480A (en) * 1983-06-13 1986-08-12 Hoechst Aktiengesellschaft Device for continuously anodically oxidizing aluminum strips on one surface thereof and use of these aluminum strips in the production of offset printing plates
US4606975A (en) * 1983-08-03 1986-08-19 Hoechst Aktiengesellschaft Process for the two-stage anodic oxidation of aluminum bases for offset printing plates and product thereof
EP1642745A3 (fr) * 2004-10-04 2006-05-24 Konica Minolta Medical & Graphic, Inc. Support en aluminium pour plaque planographique, procédé de fabrication et matériel pour plaque planographique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834998A (en) * 1971-10-21 1974-09-10 Fuji Photo Film Co Ltd Method of producing aluminum planographic printing plates
US3929591A (en) * 1974-08-26 1975-12-30 Polychrome Corp Novel lithographic plate and method
DE2557222A1 (de) * 1974-10-02 1977-06-30 Polychrome Corp Verfahren zur herstellung eines aluminiumtraegerbogens fuer druckplatten

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834998A (en) * 1971-10-21 1974-09-10 Fuji Photo Film Co Ltd Method of producing aluminum planographic printing plates
US3929591A (en) * 1974-08-26 1975-12-30 Polychrome Corp Novel lithographic plate and method
DE2557222A1 (de) * 1974-10-02 1977-06-30 Polychrome Corp Verfahren zur herstellung eines aluminiumtraegerbogens fuer druckplatten

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396470A (en) * 1980-10-23 1983-08-02 Vickers P.L.C. Lithographic printing plates
US4554216A (en) * 1982-02-23 1985-11-19 Hoechst Aktiengesellschaft Process for manufacturing support materials for offset printing plates
US4554057A (en) * 1982-02-23 1985-11-19 Hoechst Aktiengesellschaft Process for manufacturing support materials for offset printing plates
EP0121880A1 (fr) * 1983-04-07 1984-10-17 Hoechst Aktiengesellschaft Procédé en deux pas pour la préparation de matériaux anodisés d'aluminium en forme plane et leur utilisation dans la fabrication de planches à imprimer offset
JPS59193298A (ja) * 1983-04-07 1984-11-01 ヘキスト・アクチエンゲゼルシヤフト アルミニウム又はアルミニウム合金からプレ−ト状、シ−ト状又はストリツプ状の材料を製造する方法
US4566952A (en) * 1983-04-07 1986-01-28 Hoechst Aktiengesellschaft Two-stage process for the production of anodically oxidized aluminum planar materials and use of these materials in manufacturing offset-printing plates
JPH0437159B2 (fr) * 1983-04-07 1992-06-18 Hoechst Ag
US4605480A (en) * 1983-06-13 1986-08-12 Hoechst Aktiengesellschaft Device for continuously anodically oxidizing aluminum strips on one surface thereof and use of these aluminum strips in the production of offset printing plates
US4606975A (en) * 1983-08-03 1986-08-19 Hoechst Aktiengesellschaft Process for the two-stage anodic oxidation of aluminum bases for offset printing plates and product thereof
EP1642745A3 (fr) * 2004-10-04 2006-05-24 Konica Minolta Medical & Graphic, Inc. Support en aluminium pour plaque planographique, procédé de fabrication et matériel pour plaque planographique

Also Published As

Publication number Publication date
EP0007233B1 (fr) 1982-04-28
ATE926T1 (de) 1982-05-15
DE2962623D1 (en) 1982-06-09

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