GB819067A - Improvements in or relating to printing plates - Google Patents

Improvements in or relating to printing plates

Info

Publication number
GB819067A
GB819067A GB33812/55A GB3381255A GB819067A GB 819067 A GB819067 A GB 819067A GB 33812/55 A GB33812/55 A GB 33812/55A GB 3381255 A GB3381255 A GB 3381255A GB 819067 A GB819067 A GB 819067A
Authority
GB
United Kingdom
Prior art keywords
grams
plate
coating
chromium
amps
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
GB33812/55A
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.)
Semotal S A
Original Assignee
Semotal S A
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 Semotal S A filed Critical Semotal S A
Publication of GB819067A publication Critical patent/GB819067A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Electroplating And Plating Baths Therefor (AREA)

Abstract

819,067. Electroplating copper and chromium in succession. LEMOTAL S.A. Nov. 25, 1955 [Nov. 25, 1954], No. 33812/55. Class 41. [Also in Group XVI] A method of producing an offset planographic printing plate comprises the steps of electrolytically depositing a first copper coating 2 on a base-plate 1 from a cuprous solution, electrolytically depositing a further copper coating 3 over the first coating 2 from a cupric solution, electrolytically depositing over the coating 3 a thin film of chromium 4, interrupting the electrolysis, then resuming the electrolysis until a substantial chromium coating 5 has been deposited over the copper coating, and selectively removing portions of the chromium coatings in accordance with a pattern. In an example a base-plate 1 of zinc 114 cm. X 140 cm. was immersed in a bath containing 20 grams of cuprous cyanide, 15 grams of sodium cyanide, 15 grams of sodium hydroxide, 40 grams of sodium carbonate and 40 grams of Rochelle salt per litre of electrolyte, and a current of 500 amps. at 4 volts was passed for 30 minutes. The plate was then immersed in an electrolytic bath containing 250 grams of cupric sulphate per litre and a current of 300 amps. at 2.5 volts passed for 60 minutes. The plate was then buffed. The layer 4 was deposited from a bath containing 250 grams of chromic acid and 2 grams of sulphuric acid at 66 degrees Baume per litre at a temperature between 31 C. and 41‹ C. To deposit the layer 4 a current of about 3,500 amps. at 12 volts was passed for about 45 seconds after which electrolysis was suspended for about one minute. To deposit the layer 5 a current of about 3,000 amps. at 10 volts was passed for 10 minutes. After removal from the bath the plate was coated with a photographically sensitized layer 6 which was then exposed to light and developed by immersion in water to form a resist image which was then treated with a setting agent. The plate was then chemically etched to remove the chromium coatings from the parts of the plate not covered by the developed resist 6 which was finally completely removed.
GB33812/55A 1954-07-31 1955-11-25 Improvements in or relating to printing plates Expired GB819067A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1117409T 1954-07-31

Publications (1)

Publication Number Publication Date
GB819067A true GB819067A (en) 1959-08-26

Family

ID=9630015

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33812/55A Expired GB819067A (en) 1954-07-31 1955-11-25 Improvements in or relating to printing plates

Country Status (5)

Country Link
BE (1) BE540144A (en)
CH (1) CH334346A (en)
FR (2) FR1117409A (en)
GB (1) GB819067A (en)
NL (2) NL191890A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098776A2 (en) * 1982-07-02 1984-01-18 INNOLITH, société anonyme Steel lithographic printing plate having multiple chromium layers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098776A2 (en) * 1982-07-02 1984-01-18 INNOLITH, société anonyme Steel lithographic printing plate having multiple chromium layers
EP0098776A3 (en) * 1982-07-02 1985-04-10 Jean-Marie Nouel Steel lithographic printing plate having multiple chromium layers

Also Published As

Publication number Publication date
FR67069E (en) 1957-11-04
BE540144A (en)
NL191890A (en)
NL93873C (en)
FR1117409A (en) 1956-05-23
CH334346A (en) 1958-11-30

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