GB872468A - Improvements in lithographic printing plates - Google Patents

Improvements in lithographic printing plates

Info

Publication number
GB872468A
GB872468A GB2084657A GB2084657A GB872468A GB 872468 A GB872468 A GB 872468A GB 2084657 A GB2084657 A GB 2084657A GB 2084657 A GB2084657 A GB 2084657A GB 872468 A GB872468 A GB 872468A
Authority
GB
United Kingdom
Prior art keywords
support
hydroxide
gms
lithographic
inert filler
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
GB2084657A
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.)
Kodak Ltd
Original Assignee
Kodak Ltd
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 to BE551598D priority Critical patent/BE551598A/xx
Priority to FR1146571D priority patent/FR1146571A/en
Priority to DEE13677A priority patent/DE1194879B/en
Application filed by Kodak Ltd filed Critical Kodak Ltd
Priority to GB2084657A priority patent/GB872468A/en
Publication of GB872468A publication Critical patent/GB872468A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor
    • 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
    • B41N3/036—Chemical or electrical pretreatment characterised by the presence of a polymeric hydrophilic coating

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

872,468. Printing surfaces. KODAK Ltd. (Kodak Pathe S.A., Kowaliski P., Sallard H., and Vareine J. H. P.). Oct. 2, 1958 [July 2 1957], No. 20846/57. Class 100(2) A process for the preparation of lithographic printing plates which comprises forming an image on a lithographic element comprising a lipophilic surface carried on a support and treating the surface with a lithographic preparation to render the non-printing areas of the surface hydrophilic is characterised in that the support is transparent or translucent and that at least a part of the image is made by tracing through the support. The translucent or transparent support is coated with a colloidal layer of a tanned hydrophilic colloidal binder containing an inert filler, a basic hydroxide of a polyvalent metal and a dispersion of a macromolecular flexibilising substance. The basic hydroxide may be cadmium hydroxide, ferrous hydroxide, or, preferably manganese hydroxide employed in an amount of 0À2%,-3À0%, by weight of the solution of hydrophilic colloid containing the inert filler. The colloidal binder may be gelatin and the inert filler Kaolin or barium sulphate. The flexibilising macromolecular substance may consist of polymers of an alkyl acrylate, sodium alginate, or a cellulose derivative such as carboxymethylcellulose or a hydroxyalkylcellulose, and constitutes 0À5%-1% by weight of the solution of hydrophilic colloid containing the inert filler. The support may be a sheet of cellulose acetate having 43À6% acetyl. In an example a composition of the formula barium sulphate 390 gms., gelatin 48 gms., water 560 gms., and manganese hydroxide 2 gms. was made and the pH value adjusted to 7À5-8À5.40 ccs. of formaldehyde (4% solution), and 75 ccs. of a 30 % aqueous dispersion of polymethyl acrylate were added and the resulting composition coated on the support and dried at 40‹C. About 40 grams of dried material are-applied per square metre of the support. The plate may be imaged by using it as a tracing paper and employing a lithographic pencil.
GB2084657A 1957-02-16 1957-07-02 Improvements in lithographic printing plates Expired GB872468A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE551598D BE551598A (en) 1957-07-02
FR1146571D FR1146571A (en) 1957-07-02 1955-10-13 New product for the preparation of lithographic plates and process for its manufacture
DEE13677A DE1194879B (en) 1957-02-16 1957-02-16 Process for making lithographic printing plates
GB2084657A GB872468A (en) 1957-07-02 1957-07-02 Improvements in lithographic printing plates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2084657A GB872468A (en) 1957-07-02 1957-07-02 Improvements in lithographic printing plates

Publications (1)

Publication Number Publication Date
GB872468A true GB872468A (en) 1961-07-12

Family

ID=10152710

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2084657A Expired GB872468A (en) 1957-02-16 1957-07-02 Improvements in lithographic printing plates

Country Status (3)

Country Link
BE (1) BE551598A (en)
FR (1) FR1146571A (en)
GB (1) GB872468A (en)

Also Published As

Publication number Publication date
FR1146571A (en) 1957-11-13
BE551598A (en)

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