GB640655A - Improvements in or relating to planographic printing - Google Patents

Improvements in or relating to planographic printing

Info

Publication number
GB640655A
GB640655A GB20414/47A GB2041447A GB640655A GB 640655 A GB640655 A GB 640655A GB 20414/47 A GB20414/47 A GB 20414/47A GB 2041447 A GB2041447 A GB 2041447A GB 640655 A GB640655 A GB 640655A
Authority
GB
United Kingdom
Prior art keywords
solution
plate
grams
water
baume
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
GB20414/47A
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.)
Interchemical Corp
Original Assignee
Interchemical Corp
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
Priority claimed from US321205A external-priority patent/US2291854A/en
Application filed by Interchemical Corp filed Critical Interchemical Corp
Publication of GB640655A publication Critical patent/GB640655A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/26—Acidic compositions for etching refractory metals
    • 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
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

640,655. Printing-surfaces. INTERCHEMICAL CORPORATION. July 29, 1947, No. 20414. Convention date, Feb. 28, 1940. [Class 100 (ii)] [Also in Group XX] A planographic printing plate comprises a copper surface on a grained metal base, coated with a water-receptive chromium layer in the non-printing areas, the copper being exposed in the printing areas to act as the ink-bearing portion of the plate. A grained base member 11 of steel or the like is plated to yield a smooth back copper layer 13 to prevent rusting and a grained copper layer 12, over which is plated a deposit 14 of chromium. A sensitized coating 15, such as a solution comprising 3 ounces of a solution of 500 c.c. 16.5‹ Baume gum arabic solution, 230 c.c. 16.5‹ Baume ammonium bichromate solution and 25 c.c. 28 per cent ammonium hydroxide, with 1 ounce of 10 per cent polyvinyl alcohol, is deposited, as by spinning, on the chromium, and exposed to light through a positive transparency 16. The positive is removed, imperfections in the non- printing areas N painted out with lacquer, and the plate treated with a developing solution, which may comprise 950 c.c. 40‹ Baume calcium chloride solution and 50 c.c. 85 per cent lactic acid syrup, adjusted with water to 37‹ Baume, to remove the unexposed parts of the coating 15, leaving the hardened exposed coating on the areas N. The plate is etched with a solution which may comprise 3 volumes propylene glycol to 1 volume 37 per cent hydrochloric acid to remove the chromium in the printing areas P down to the copper, which is not affected. The lacquer and etch solution are removed with anhydrous alcohol. The plate is then coated with a thin film of water-resistant liquid asphaltum or varnish, which may comprise 70 grams phenol aldehyde resin, 10 grams dimethyl phthalate, 95 grams furfural and 25 grams benzaldehyde. After drying, a developing ink is applied comprising a conventional carbon black linseed oil lithographic ink thinned with turpentine. The hardened exposed coating 15 is dissolved with warm water, and the plate, the copper being protected by the varnish and ink, is etched to make it water-receptive with a desensitizing solution comprising ¢ to 1¢ volumes of a solution of 40-80 grams basic chromium sulphate, 6-18 grams 85 per cent phosplioric acid and 500 c.c. water to from 4 to 12 volumes of 14‹ Baume gum arabic solution at 25‹ C., which leaves a coating of gum arabic on the plate.
GB20414/47A 1940-02-28 1947-07-29 Improvements in or relating to planographic printing Expired GB640655A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US321205A US2291854A (en) 1940-02-28 1940-02-28 Lithographic plate and method of producing it
US421033A US2333221A (en) 1940-02-28 1941-11-29 Etching solution for lithographic plates

Publications (1)

Publication Number Publication Date
GB640655A true GB640655A (en) 1950-07-26

Family

ID=26982860

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20414/47A Expired GB640655A (en) 1940-02-28 1947-07-29 Improvements in or relating to planographic printing

Country Status (3)

Country Link
US (1) US2333221A (en)
BE (1) BE500011A (en)
GB (1) GB640655A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690119A (en) * 1951-05-25 1954-09-28 Coates Brothers & Co Bimetallic moistening roller for lithographic printing apparatus
US3001872A (en) * 1957-03-18 1961-09-26 Xerox Corp Preparing planographic plates and solution therefor
US3425854A (en) * 1966-05-02 1969-02-04 Kern C Borden Metal conditioning bath comprising sodium hydroxide,nitric acid,and gum arabic
GB2436329B (en) * 2006-03-24 2011-07-27 Curwen Chilford Prints Ltd Screenless photolithography

Also Published As

Publication number Publication date
US2333221A (en) 1943-11-02
BE500011A (en)

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