EP0007233A1 - Verfahren zur Behandlung von Aluminiumfolien oder Flachdruckplatten sowie die so erhaltenen Produkte - Google Patents
Verfahren zur Behandlung von Aluminiumfolien oder Flachdruckplatten sowie die so erhaltenen Produkte Download PDFInfo
- 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
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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.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Printing Plates And Materials Therefor (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Chemical Treatment Of Metals (AREA)
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 |
---|---|---|---|
GB7829705 | 1978-07-13 | ||
GB2970578 | 1978-07-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0007233A1 true EP0007233A1 (de) | 1980-01-23 |
EP0007233B1 EP0007233B1 (de) | 1982-04-28 |
Family
ID=10498399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79301377A Expired EP0007233B1 (de) | 1978-07-13 | 1979-07-12 | Verfahren zur Behandlung von Aluminiumfolien oder Flachdruckplatten sowie die so erhaltenen Produkte |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0007233B1 (de) |
AT (1) | ATE926T1 (de) |
DE (1) | DE2962623D1 (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4396470A (en) * | 1980-10-23 | 1983-08-02 | Vickers P.L.C. | Lithographic printing plates |
EP0121880A1 (de) * | 1983-04-07 | 1984-10-17 | Hoechst Aktiengesellschaft | Zweistufiges Verfahren zur Herstellung von anodisch oxidierten flächigen Materialien aus Aluminium und deren Verwendung bei der Herstellung von Offsetdruckplatten |
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 (de) * | 2004-10-04 | 2006-05-24 | Konica Minolta Medical & Graphic, Inc. | Aluminiumträger für eine Flachdruckplatte, Herstellungsverfahren und Material dafür |
Citations (3)
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 |
-
1979
- 1979-07-12 EP EP79301377A patent/EP0007233B1/de not_active Expired
- 1979-07-12 DE DE7979301377T patent/DE2962623D1/de not_active Expired
- 1979-07-12 AT AT79301377T patent/ATE926T1/de not_active IP Right Cessation
Patent Citations (3)
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)
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 (de) * | 1983-04-07 | 1984-10-17 | Hoechst Aktiengesellschaft | Zweistufiges Verfahren zur Herstellung von anodisch oxidierten flächigen Materialien aus Aluminium und deren Verwendung bei der Herstellung von Offsetdruckplatten |
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 (de) * | 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 (de) * | 2004-10-04 | 2006-05-24 | Konica Minolta Medical & Graphic, Inc. | Aluminiumträger für eine Flachdruckplatte, Herstellungsverfahren und Material dafür |
Also Published As
Publication number | Publication date |
---|---|
EP0007233B1 (de) | 1982-04-28 |
ATE926T1 (de) | 1982-05-15 |
DE2962623D1 (en) | 1982-06-09 |
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