EP0022033B1 - Offsetdruckplatten, die eine, mittels eines dünnen Chrombelags mattierte, hydrophile Oberfläche aufweisen - Google Patents

Offsetdruckplatten, die eine, mittels eines dünnen Chrombelags mattierte, hydrophile Oberfläche aufweisen Download PDF

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Publication number
EP0022033B1
EP0022033B1 EP19800400982 EP80400982A EP0022033B1 EP 0022033 B1 EP0022033 B1 EP 0022033B1 EP 19800400982 EP19800400982 EP 19800400982 EP 80400982 A EP80400982 A EP 80400982A EP 0022033 B1 EP0022033 B1 EP 0022033B1
Authority
EP
European Patent Office
Prior art keywords
chromium
layer
hydrophilic surface
plate
micrometer
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
EP19800400982
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English (en)
French (fr)
Other versions
EP0022033A1 (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 Te Villers-La-Montagne Frankrijk
Original Assignee
Nouel Jean-Marie
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 Nouel Jean-Marie filed Critical Nouel Jean-Marie
Publication of EP0022033A1 publication Critical patent/EP0022033A1/de
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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
    • 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

Definitions

  • the present invention relates to new offset plates, the hydrophylic surface of which has been made "matt thanks to a thin layer of chromium.
  • offset reproduction methods use plates having a surface of hydrophilic nature. This same surface must advantageously be matt, this mattness being advantageous on the one hand, to facilitate the control work at the time of printing and on the other hand, to facilitate the attachment, on a surface, of a photosensitive layer .
  • This mattness can be obtained by treating the support of the plate or the surface in a material of hydrophilic nature by methods which call for an attack on said surface, either mechanically, chemically or electrochemically.
  • chromium has been widely described for producing the hydrophilic surface of an offset plate.
  • the chrome layers employed have notable advantages with regard to their hardness, their hydrophilicity and possibly their appearance. Indeed, these chromium layers can have a mat surface.
  • electrochemically obtain a chromium layer with a mat surface two methods are known, one consisting in using an electrolytic bath at low temperature (5 to 8 ° C. for example) and the other consisting in using an electrolytic bath at lower temperature normal (25 to 35 ° C) but by interrupting the electric current while the said deposition is carried out. But in all known cases the chromium layer (with a shiny or mat surface) which must play the role of aquaphile layer of the offset plates must have a notable thickness (clearly greater than 1 micrometer and generally from 1.5 to 2.8 micrometers ).
  • GB-A-1 172 517 describes a plate whose substrate is made of copper or brass; this substrate being covered with a spongy layer of chromium, itself covered with an ink-absorbing photosensitive layer.
  • the specialist knows that the deposited chromium layer is necessarily of a thickness greater than 1.5 micrometers (thickness explained in said patent).
  • hydrophilic chromium layers less than 1 micrometer thick could possibly be deposited on supports.
  • specialists are well aware that the very thin layers recommended cannot play their role of hard aquaphilic layers because they are scratched too easily and are often porous, thus revealing an underlying surface with properties which are unacceptable in offset reproduction. .
  • This is what is described in particular in BE-A-779 229 where, in addition, the chromium oxide chromium layer used as an aquaphile surface is of a shiny nature therefore does not allow sufficient adhesion of a photosensitive layer .
  • the invention therefore relates to offset plates with a hydrophilic metallic surface and an encrophilic surface obtained from a photosensitive printing layer, comprising a steel support having a glossy and smooth hydrophilic surface, characterized in that said glossy hydrophilic surface is at least partially covered. a layer of matt and porous chromium having a thickness of less than 1 micrometer.
  • the invention consists in depositing on a surface having hydrophilic properties which can be used in the sense of offset, a very thin layer of matt chromium, the relative porosity and fragility of which will be accepted precisely because the underlying surface is hydrophilic and encrophobic , but which will be used to make the surface of the final material "matt".
  • hydrophilic surfaces which can be made matt using the invention are all the surfaces which, to date, have been considered as hydrophilic surfaces usable in offset plates.
  • chromium With a thin layer of chromium, it is possible to matte shiny or semi-shiny surfaces of hard materials such as stainless steel, tin-nickel, chromium itself, chrome surfaces. -chromium oxide (which is coated with steel for certain cans), nickel-phosphorus, tin alloys and nickel alloys.
  • a matte appearance plate is obtained.
  • the plate is covered with a layer (approximately 1.8 micrometer thickness) of photosensitive commercial printer (PCAS). After drying (3 min at 45 ° C and 5 min at 85 ° C) the plate is ready.
  • PCAS photosensitive commercial printer
  • the plate is then used as known in offset processes: insolation, rearing of soluble parts, exfoliation, etc.
  • the plate is thus covered with a smooth, hard and shiny layer of chromium which will provide it with good protection during handling.
  • This plate is then immersed in an electrolytic chromium bath with a composition identical to that of the bath described above, but it is operated at a temperature of 28 ° C. and is deposited, under 30 A by square decimetre, on only one of the faces of the plate, a matt chrome thickness of 0.4 micrometer.
  • a plate is thus obtained protected on all its faces by a layer of smooth chrome and which comprises, on one of its faces, a surface of matt chrome usable in offset.
  • a photosensitive printer layer is then deposited on the mat surface and a ready-made offset plate is obtained.
  • a chromed steel plate sold by the company SOLLAC is used as a starting plate.
  • the plate After degreasing hot (65 ° C) in a sodium carbonate bath (100 g / 1), the plate being cathode, the plate is introduced into a chromium bath in order to achieve, on one of its faces, the deposit of a thin layer (0.3 micrometer of matt chromium).

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Laminated Bodies (AREA)

Claims (3)

1. Offsetplatten mit einer hydrophilen Mettalloberfläche und einer druckfreundlichen Oberfläche aus einer druckenden fotosensiblen Schicht, welche einen Stahlträger mit gläzender und glatter hydrophiler Oberfläche aufweist, dadurch gekennzeichnet, daß die hydrophile glänzende Oberfläche zumindest teilweise mit einer matten und porösen Chromschicht von einer Dicke von weniger als 1 µm überzogen ist.
2. Platten nach Anspruch 1, dadurch gekennzeichnet, daß die Chromschicht eine Dicke von weniger als 0,5 µm aufweist.
3. Platten nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die hydrophile Oberfläche aus rostfreiem Stahl, Zinn-Nickel, Chrom, Chrom-Chromoxid, Nickel-Phosphor, aus einer Zinnlegierung oder Nickellegierung gebildet ist.
EP19800400982 1979-07-02 1980-06-30 Offsetdruckplatten, die eine, mittels eines dünnen Chrombelags mattierte, hydrophile Oberfläche aufweisen Expired EP0022033B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7917153A FR2460211A1 (fr) 1979-07-02 1979-07-02 Nouvelle plaque offset a surface rendue mate par du chrome
FR7917153 1979-07-02

Publications (2)

Publication Number Publication Date
EP0022033A1 EP0022033A1 (de) 1981-01-07
EP0022033B1 true EP0022033B1 (de) 1984-09-05

Family

ID=9227397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800400982 Expired EP0022033B1 (de) 1979-07-02 1980-06-30 Offsetdruckplatten, die eine, mittels eines dünnen Chrombelags mattierte, hydrophile Oberfläche aufweisen

Country Status (8)

Country Link
EP (1) EP0022033B1 (de)
JP (1) JPS5637192A (de)
BR (1) BR8004111A (de)
CA (1) CA1133755A (de)
DE (1) DE3069101D1 (de)
ES (1) ES492985A0 (de)
FR (1) FR2460211A1 (de)
MX (1) MX156999A (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2480676A1 (fr) * 1980-04-16 1981-10-23 Nouel Jean Marie Nouvelles plaques offset en acier utilisant des surfaces a base d'oxyde de chrome
FR2529511A1 (fr) * 1982-07-02 1984-01-06 Nouel Jean Marie Plaques offset a base acier et a multicouches de chrome
JPS6131355A (ja) * 1984-07-20 1986-02-13 工業技術院長 黒鉛−炭化ホウ素系摺動部材
US4911075A (en) * 1988-08-19 1990-03-27 Presstek, Inc. Lithographic plates made by spark discharges
JPH02131992A (ja) * 1989-06-14 1990-05-21 Konica Corp 平版印刷版用支持体

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
GB640470A (en) * 1947-09-04 1950-07-19 Coates Brothers & Co Improvements in the manufacture of lithographic printing plates
DE806315C (de) * 1949-10-18 1951-06-14 Roman Freundorfer Offsetdruckplatte und Verfahren zur Herstellung derselben
FR82759E (fr) * 1962-09-27 1964-04-17 Le Quadrimetal Offset Sa Pour Procédé d'impression offset et produits industriels en résultant
GB1172517A (en) * 1965-12-02 1969-12-03 Rotaprint Ltd Photochemical Production of Plates for Offset Lithography
BE779229A (en) * 1972-02-10 1972-05-30 Centre Rech Metallurgique Offset printing plates - have a steel support with a chromium layer and a radiation sensitive layer,prodn
JPS5131507A (ja) * 1974-09-11 1976-03-17 Fuji Photo Film Co Ltd Ofusetsutoinsatsubanyoshijitai
FR2442722A1 (fr) * 1978-11-29 1980-06-27 Nouel Jean Marie Nouvelle couche aquaphile pour les plaques d'imprimerie offset et plaques obtenues

Also Published As

Publication number Publication date
ES8200273A1 (es) 1981-10-16
JPH0322314B2 (de) 1991-03-26
BR8004111A (pt) 1981-01-21
JPS5637192A (en) 1981-04-10
FR2460211B1 (de) 1984-07-06
DE3069101D1 (en) 1984-10-11
ES492985A0 (es) 1981-10-16
MX156999A (es) 1988-10-19
CA1133755A (en) 1982-10-19
FR2460211A1 (fr) 1981-01-23
EP0022033A1 (de) 1981-01-07

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