EP0098776B1 - Flachdruckplatte aus Stahl mit mehreren Chromschichten - Google Patents

Flachdruckplatte aus Stahl mit mehreren Chromschichten Download PDF

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Publication number
EP0098776B1
EP0098776B1 EP83401346A EP83401346A EP0098776B1 EP 0098776 B1 EP0098776 B1 EP 0098776B1 EP 83401346 A EP83401346 A EP 83401346A EP 83401346 A EP83401346 A EP 83401346A EP 0098776 B1 EP0098776 B1 EP 0098776B1
Authority
EP
European Patent Office
Prior art keywords
chromium
layer
layers
steel
chrome
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.)
Expired
Application number
EP83401346A
Other languages
English (en)
French (fr)
Other versions
EP0098776A3 (en
EP0098776A2 (de
Inventor
Jean-Marie Nouel
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.)
INNOLITH SA
Original Assignee
INNOLITH SA
Innolith SA
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 INNOLITH SA, Innolith SA filed Critical INNOLITH SA
Priority to AT83401346T priority Critical patent/ATE37163T1/de
Publication of EP0098776A2 publication Critical patent/EP0098776A2/de
Publication of EP0098776A3 publication Critical patent/EP0098776A3/fr
Application granted granted Critical
Publication of EP0098776B1 publication Critical patent/EP0098776B1/de
Expired legal-status Critical Current

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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
    • 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
    • B41N1/10—Printing plates or foils; Materials therefor metallic for lithographic printing multiple

Definitions

  • the present invention relates to offset plates based on steel (or black iron) and with multiple layers of chromium.
  • Offset plates having a steel (or black iron) support, an aquaphile (and encrophobic) layer of chromium and an ink-absorbing printing layer of photosensitive material have already been described and marketed.
  • the aquaphile chromium layer must have very specific properties, in particular given that the surface of said layer must allow the attachment of the photosensitive material.
  • the printer part was supplied by an ink-sensitive photosensitive resin (or a photopolymer).
  • the protective layer is a thin layer of shiny chrome.
  • Such layers are perfectly known and are used for the decoration and for the protection against corrosion of metallic surfaces susceptible to rusting in applications of the light fixture type, chromed chairs, etc.
  • the known and described techniques for the production of such layers are obviously usable in the present invention; these techniques imply in particular that the industrial conditions for producing such layers are such that the layers adhere perfectly to the support and cover it as much as possible.
  • electroplating with the use of baths working at relatively high temperatures (at least about 40 ° C.) and if possible with a highly conductive catalyst (addition of active fluorine) such as SiF s will be used .
  • a layer of chromium having a minimum of 400 microcracks per centimeter is called a layer of "microcracked chromium” and a layer of "microcracked chromium” a layer of chromium having at least 40 cracks per centimeter.
  • microcracked or microcracked chromium could be used as an aquaphile layer of offset plates, taking into account on the one hand its texture and on the other hand its surface properties since said surface can be rendered "mat" and sufficiently hang the photosensitive layers.
  • the second technique for producing thick chromium surface layers consists in producing said layers by superimposing thin elementary layers of chromium.
  • thin elementary layer is meant a layer of chromium with a thickness of less than about 0.5 microns.
  • This deposition of several successive elementary layers can be carried out in a chrome bath seal (by cutting the current several times) or in several successive baths; of course at least the last layer of chromium will be produced under known conditions leading to the production of a mat appearance layer allowing the adhesion of the photosensitive layers.
  • a chrome bath seal by cutting the current several times
  • several successive baths of course at least the last layer of chromium will be produced under known conditions leading to the production of a mat appearance layer allowing the adhesion of the photosensitive layers.
  • flash deposition means the deposition of a very thin layer, generally less than 0.2 microns and preferably less than 0.1 microns.
  • bright chrome a chrome which, if deposited directly on the smooth surface of steel, would have a shiny or semi-shiny appearance (that is to say which has the crystalline structure of a chromium brilliant). It is however eridly that the flash thus deposited will not profoundly modify the matt appearance of the chrome surface but this flash will have the function of at least partially closing the cracks or holes which appear on the surface of the matt chrome.
  • Corrosion inhibitors (steel and black iron) are known.
  • the inhibitors used in the context of the present invention are preferably products of the anionic type.
  • chromium is understood to cover not only the chromium itself but also the chromium-based alloys which are harder than chromium (especially the Cr-Mo alloys) and which have the same aquaphile and encrophobic properties.
  • chromium alloys it has been found that it is sometimes desirable to use chromium alloys with a metal whose potential is strongly negative such as manganese for example. This lowers the negative potential of chromium by thereby modifying some of its properties advantageously. It is desirable that the metal alloyed with chromium is more electronegative than steel or iron.
  • the electrolytic deposits of chromium were carried out according to one of the following methods:
  • the plate is immersed in a bath containing 250 g / I of Cr 2 0 3 and 2.5 g / I of S0 4 H 2 ; the bath temperature is 45 ° C and the density of 30 A / dm 2.
  • the chromium layer has a thickness of 0.11 micron.
  • the plate is immersed in a bath giving rise to a deposit of microcracked chromium (bath sold under the reference 2300-WALBERG), the bath being at a temperature of 55 ° C. and using a current density of 30 A / dm 2 .
  • the chromium layer has a thickness of 0.39 microns.
  • the plate is immersed in a bath containing Cr 2 0 3 247 g / I, S0 4 H 2 1; 1 g / l, SiF 6 2, 1 g / I (a bath of this type is described in US Patent 3,498 892); the temperature is 65 ° C, the current density used is 60 Aldm 2.
  • the chromium layer has a 0.11 micron thickener.
  • the deposit is shiny and very "covering", that is to say that it penetrates well into all the support pores.
  • Plate B is used, which is again treated by an identical bath (2300 Walberg), but a temperature of 38 ° C. and a current density of 35 A / dm 2 are used .
  • One of the plates A or C of Example 1 is used as starting material.
  • a plate which comprises, above the surface of the steel, four layers of chromium, the first of thickness 0.11 microns and the other three of thickness 0.4 microns each.
  • the plates A and C of Example 1 are used. These three plates are deposited on three plates of chromium with a mat appearance and a thickness of 0.40 micron each, carrying out electrolysis at 35 A / dm 2 and at 30 °. vs.
  • a new layer of chromium is deposited under the same conditions as those used when the first layer of bright chromium was deposited.
  • the plate having received this surface layer of "shiny chrome" thickness 0.09 micron retains a matt appearance but has been shown to be particularly resistant to corrosion.
  • a type B plate is used (cf. example 1) covered with two layers of matt chrome.
  • This plate is immersed for 20 seconds in a bath at 70 ° C. containing 19 g of monosodium phosphate and 19 g of sodium dichromate.
  • the plate was covered with a very slight deposit of these salts.
  • the plates according to the invention could, without deformation, undergo baking (10 minutes at 220 ° C. for example) intended to harden the exposed parts of the photosensitive surface layer deposited on the surface of the chromium.
  • T FS titanium free steel
  • the thickness of the chromium is of the order of 0.005 microns.
  • This coil is degreased anodically at 40 ° C, 15 A / dm2 for 5 seconds, in a bath containing 40 g / I of sodium hydroxide.
  • chromium plating is carried out in a so-called rapid chromium plating bath (containing fluorine) at 45 ° C and 52 A / dm2.
  • This chrome plating is carried out by successive dipping of the coil in the bath (in fact, the coil takes place passing around cylinders located alternately in and out of the bath).
  • the deposit is interrupted 5 times. Each interruption is approximately 2 to 3 seconds.
  • a deposit of chromium with a total thickness of approximately 1.2 microns is thus obtained.
  • Example 6 was repeated, but treating the steel coil with cathodic degreasing instead of anodic degreasing.
  • the degreasing bath contains soda, carbonate and phosphate; the temperature is 68 ° C, the intensity of 15 A / dm2 and the duration of 5 H.
  • the coil thus degreased is treated as in Example 6.
  • the coils obtained in Examples 6 and 7 were cut into plates; each plate coated with an ink-absorbing photosensitive layer, then baked. The plates obtained were found to be excellent for printing.

Landscapes

  • Laminated Bodies (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating And Plating Baths Therefor (AREA)

Claims (5)

1. Offset-Platten auf Stahlbasis und mit hydrophiler Chromschicht, umfassend:
-in Kontakt mit dem Stahl eine Schutzschicht (A) aus Glanzchrom mit einer Dicke von weniger als 0,4 um;
-über der Schutzschicht eine Schicht (B) aus chrom mit matter Oberfläche;
welche Platten dadurch gekennzeichnet sind, daß die Schicht (B) ausgewählt ist aus:
a) Chromschichten umfassend mindestens 400 Mikrosprünge Pro Zentimeter (genannt Mikrosprungschichten) oder umfassend mindestens 40 Risse pro Zentimeter (genannt Mikrorißschichten);
(b) Chromschichten erhalten durch Niederschlag von mehr als zwei Chromschichten nacheinander, wobei jede der Schichten eine Dicke von weniger als 0,5 um hat;
c) oder einer Überlagerung der Schichten a) und b), wobei die Schicht (B) eine Dicke von mehr als 1 um aufweist.
2. Platten nach Anspruch 1, dadurch gekennzeichnet, daß die matte Oberfläche der Chromschicht(en) von einer Glanzchromschicht mit einer Dicke von weniger als 0,2 µm überzogen ist.
3. Platten nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Mattchromschicht erhalten ist durch Niederschlag von mehreren Chromschichten, von denen jede durch Niederschlag von Chrom mit mattem Aussehen erhalten ist.
4. Platten nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sie weiters auf der Mattchromschicht einen Korrosionshemmer erhalten haben.
EP83401346A 1982-07-02 1983-06-30 Flachdruckplatte aus Stahl mit mehreren Chromschichten Expired EP0098776B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83401346T ATE37163T1 (de) 1982-07-02 1983-06-30 Flachdruckplatte aus stahl mit mehreren chromschichten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8211690A FR2529511A1 (fr) 1982-07-02 1982-07-02 Plaques offset a base acier et a multicouches de chrome
FR8211690 1982-07-02

Publications (3)

Publication Number Publication Date
EP0098776A2 EP0098776A2 (de) 1984-01-18
EP0098776A3 EP0098776A3 (en) 1985-04-10
EP0098776B1 true EP0098776B1 (de) 1988-09-14

Family

ID=9275648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401346A Expired EP0098776B1 (de) 1982-07-02 1983-06-30 Flachdruckplatte aus Stahl mit mehreren Chromschichten

Country Status (4)

Country Link
EP (1) EP0098776B1 (de)
AT (1) ATE37163T1 (de)
DE (1) DE3377978D1 (de)
FR (1) FR2529511A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687729A (en) * 1985-10-25 1987-08-18 Minnesota Mining And Manufacturing Company Lithographic plate
US4996131A (en) * 1987-12-28 1991-02-26 Nouel Jean Marie Offset plate with thin chromium layer and method of making
JP4059621B2 (ja) * 2000-09-29 2008-03-12 日本ピストンリング株式会社 クロムめっき摺動部材及びその製造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB475902A (en) * 1936-05-29 1937-11-29 Arthur Ronald Trist Improvements in and relating to printing plates for lithography
NL135202C (de) * 1946-10-04
BE540144A (de) * 1954-07-31
FR82759E (fr) * 1962-09-27 1964-04-17 Le Quadrimetal Offset Sa Pour Procédé d'impression offset et produits industriels en résultant
US3758390A (en) * 1971-06-18 1973-09-11 M & T Chemicals Inc Novel cromium plating compositions
AU4610272A (en) * 1971-09-07 1974-03-07 M & T Chemicals Inc Wearing surface
FR2460211A1 (fr) * 1979-07-02 1981-01-23 Nouel Jean Marie Nouvelle plaque offset a surface rendue mate par du chrome
FR2480677A1 (fr) * 1980-04-16 1981-10-23 Nouel Jean Marie Nouveaux supports de plaques offset en fer noir

Also Published As

Publication number Publication date
ATE37163T1 (de) 1988-09-15
FR2529511B3 (de) 1985-05-17
EP0098776A3 (en) 1985-04-10
DE3377978D1 (en) 1988-10-20
FR2529511A1 (fr) 1984-01-06
EP0098776A2 (de) 1984-01-18

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