GB1235863A - Lithographic printing plates - Google Patents

Lithographic printing plates

Info

Publication number
GB1235863A
GB1235863A GB4088368A GB4088368A GB1235863A GB 1235863 A GB1235863 A GB 1235863A GB 4088368 A GB4088368 A GB 4088368A GB 4088368 A GB4088368 A GB 4088368A GB 1235863 A GB1235863 A GB 1235863A
Authority
GB
United Kingdom
Prior art keywords
sheet
light
compounds
acid
photo
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
GB4088368A
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.)
Polychrome Corp
Original Assignee
Polychrome 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
Application filed by Polychrome Corp filed Critical Polychrome Corp
Publication of GB1235863A publication Critical patent/GB1235863A/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
    • 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

Abstract

1,235,863. 863. Anodizing aluminium. POLYCHROME CORP. Aug.27, 1968 [Sept.25, 1967], No.40883/68. Heading C7B. [Also in Division G2] In making a lithographic printing plate, a surface of an Al sheet is (a) mechanically grained, (b) anodized to form a hard, dark, steel-greyish, substantially lustreless surface on the sheet, (c) coated with a bonding substance to improve bonding to the sheet surface of a light-sensitive coating, and (d) coated with the light-sensitive coating. The graining of the sheet may be by rubbing with an abrasive, by sand blasting or by wire-brushing. Thereafter, the sheet may be mildly etched in a warm alkaline solution and rinsed. The anodizing may be in H 2 SO 4 solution (of strength 8-22% by weight of acid in water) at 70-75‹ F. using 10-20 volts and a current density of 10-20 amps/sq.ft. The cathode surface can be a lead lined tank or a lead coil which can also serve, along with air agitation to cool the electrolyte. A fibreglass tank can be used. The bonding substance may be alkali silicate, silicic acid, alkali zirconium fluoride or hydrofluozirconic acid. Specified groups of light-sensitive compounds and compositions that may be used are:- tannable colloids that contain a dichromate sensitizer; photo-polymerizable materials that are polymerized by photo-initiators; diazo compounds; aromatic diazido compounds; acenaphthenes; sulfanilido-methylene-fluorenes; S- alkylthiodiarylamine perchlorates, iodonitrothiophenes; and nitronaphthalenes. Examples are given of materials falling within some of these groups.
GB4088368A 1967-09-25 1968-08-27 Lithographic printing plates Expired GB1235863A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US67040367A 1967-09-25 1967-09-25
US57040367A 1967-09-25 1967-09-25

Publications (1)

Publication Number Publication Date
GB1235863A true GB1235863A (en) 1971-06-16

Family

ID=27075321

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4088368A Expired GB1235863A (en) 1967-09-25 1968-08-27 Lithographic printing plates

Country Status (3)

Country Link
DE (1) DE1796159C3 (en)
FR (1) FR1581433A (en)
GB (1) GB1235863A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2388305A1 (en) * 1977-04-18 1978-11-17 Polychrome Corp IMPROVED PROCESSING OF LITHOGRAPHIC PRINTING PLATES BY A MID LAYER
DE3031764A1 (en) * 1979-08-24 1981-03-26 Polychrome Corp., Yonkers, N.Y. ALUMINUM SUBSTRATES FOR OFFSET PRINTING PLATES AND METHOD FOR THE PRODUCTION THEREOF
EP0418575A2 (en) * 1989-08-31 1991-03-27 BASF Aktiengesellschaft Process for the manufacture of plates, foils, or sheet-like materials and process for the manufacture of presensitized lithographic printing plates
GB2241508A (en) * 1990-03-01 1991-09-04 Heidelberger Druckmasch Ag Electrolytic passivation of metal surfaces eg of rotary printing cylinders to control wetting behaviour

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU6138180A (en) * 1979-10-17 1981-04-30 Polychrome Corp. White lithographic substrate
WO1993006528A1 (en) * 1991-09-13 1993-04-01 Sun Chemical Corporation Positive-working coating compositions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2119031A (en) * 1934-05-25 1938-05-31 Addressograph Multigraph Planographic printing plate
GB679097A (en) * 1951-05-24 1952-09-10 Arthur Godfrey Ellis Improvements in and relating to potters' lathes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2388305A1 (en) * 1977-04-18 1978-11-17 Polychrome Corp IMPROVED PROCESSING OF LITHOGRAPHIC PRINTING PLATES BY A MID LAYER
DE3031764A1 (en) * 1979-08-24 1981-03-26 Polychrome Corp., Yonkers, N.Y. ALUMINUM SUBSTRATES FOR OFFSET PRINTING PLATES AND METHOD FOR THE PRODUCTION THEREOF
EP0418575A2 (en) * 1989-08-31 1991-03-27 BASF Aktiengesellschaft Process for the manufacture of plates, foils, or sheet-like materials and process for the manufacture of presensitized lithographic printing plates
EP0418575A3 (en) * 1989-08-31 1992-02-05 Basf Aktiengesellschaft Process for the manufacture of plates, foils, or sheet-like materials and process for the manufacture of presensitized lithographic printing plates
GB2241508A (en) * 1990-03-01 1991-09-04 Heidelberger Druckmasch Ag Electrolytic passivation of metal surfaces eg of rotary printing cylinders to control wetting behaviour
US5184550A (en) * 1990-03-01 1993-02-09 Heidelberger Druckmaschinen Ag Device for controlling wetting behavior of metal surfaces by application of electrolyte under controlled voltage
GB2241508B (en) * 1990-03-01 1994-07-06 Heidelberger Druckmasch Ag Conditioning of metal surfaces

Also Published As

Publication number Publication date
FR1581433A (en) 1969-09-12
DE1796159C3 (en) 1981-07-30
DE1796159A1 (en) 1972-03-30
DE1796159B2 (en) 1976-11-11

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