US2369567A - Method of producing printing plates - Google Patents

Method of producing printing plates Download PDF

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Publication number
US2369567A
US2369567A US356190A US35619040A US2369567A US 2369567 A US2369567 A US 2369567A US 356190 A US356190 A US 356190A US 35619040 A US35619040 A US 35619040A US 2369567 A US2369567 A US 2369567A
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US
United States
Prior art keywords
metal
printing
plate
image
water
Prior art date
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Expired - Lifetime
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US356190A
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English (en)
Inventor
Hausleiter Fritz Hermann
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Individual
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Individual
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Publication of US2369567A publication Critical patent/US2369567A/en
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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
    • 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
    • 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

Definitions

  • the flat or offset printing is based on' the fact that the fat printing ink is repelled by the por-' tions moistened with water, or the so-called etched portions.
  • etching with salt or acid solutions
  • these portions become water-carrying while the image or letters, con sisting of fat substances or lacquers, constantly take 'up the'printing ink (the level which is continually moistened does not take on any ink).
  • the flat printing plates of known type continuous re-etching is necessary. The latter must,
  • a known method of this kind provides that the plate or carrier metalis uniformly coated printing is based on the principle that the inking with a thin film of another metal, that then the image is applied and that the non-covered image portions are removed by etching down to the carrier metal.
  • Another proposition consists in bringing the picture in some way, in this case negatively, onto the carrier metal, and in depos- I iting galvanically another metal unto the unnon-printing portions of water-attracting metal,
  • the invention proposes an absolutelynew method for attaining this aim by ina printing plates with one of the substances known from the flotation as so-called flotation additions .so that the moistening capability, as regards fat and oil or water, is respectively increased.
  • the flotation or floating dressing is based on When producing fiat printing plates the purpose is of course different because molstenmg with oil takes place during the printing. Consequently, one added medium will generally be sufficient for the method according to the invention (compare for instance Ullmann, Encyclopaedia of the Technical Chemistry, volume 1, 1928, page 796 .and following). Alkaline additions or such which reduce the formation of ilakes or such which possess eii'ects similar to those of the oil also can be considered. The additions used for differential flotation and such additions which cause a chemical alteration of the surface, as for instance sulfidizing additions, have proved to be particularly suitable. It has further shown to be suitable in individual cases to add in fine distribution to the treating liquid (etch) an oil or the type of the flotation oils.
  • the treatment can be carried out with solutions suitable alloys for the level metal are nickelmagnesium on a copper plate or cobalt-magnesium on a zinc plate.
  • an aqueous solution of xanthogenic alkali salts and hydroferrocyanic salts preferably at a pH of about 8 to 9 can be used for the treatment according to the invention.
  • the same liquid can be used for other metal combinations, such as zinc with cobalt-magnesium.
  • the value of the xanthogenic salts is preferably preponderate, and the pH value is located at about 6 to 7.
  • the surface of a metal plate may bear a non-electric insulating coating, such as lacquer or ink, the plate being galvanized with a metal of the iron group. Then follows the treatment with the solutions according to the invention.
  • the production of the plate may, however, be
  • the oil and the addition dissolve completely, in inorganic media, especially water, the additions may be dissolved and the oil emulsified.
  • the treatment in such a solution of flotation additions is suificient, in other instances, however, it is advisable to provide further a treatment with the socalled lithographic etches as have been used up to the present in order to make the level water-carrying.
  • This etching can take place before the treatment with the flotation additions or more advantageously after the same.
  • An especially advantageous embodiment of the invention consists, however, in the simultaneous flotating and etching. This is carried out by employment of a solution which contains both the flotation media and lithographic etches.
  • the selection of the-flotation addition depends chiefly on the nature of the image metal which is used, however, also on the nature of the level metal. In every individual case an addition of the kind has to be employed which renders the surface of the image the most capable of oilmo-istening but which has the least possible influence on the level metal and does not disturb the etching effect.
  • Suitable metal combinations depends on the existing conditions. In many cases it is especially advisable to use as fatcarrying metal a metal or an alloy of the copper group, for instance a nickel-cobalt alloy.
  • a brass sheet metal plate might, for instance, be coated with a suitably thick layer of cobalt, an image be produced on this layer (the image resisting corrosives, for instance a lacquer copy), whereupon the cobalt layer is etched through down to the brass plate at the uncovered portions, for instance by means of chromic acid solution.
  • Example 1 the image is produced in any suitable manner in fat ink on a brass plate. This can be obtained by transferring or by printing down, by hand-drawing, or in a similar manner. The level, that is the unprotected parts, is then nickeled, or coated with a deposit of, for instance, magnesium containing nickel.
  • the flat printing plate thus obtained is lithographically etched, preferably with an etch consisting of l to 20%, preferably 1 to 5% hydroferrocyanic potassium solution, to which alkali is added perhaps up to the pH value of 9.
  • the plate is then placed in the machine.
  • a fountain etch which is suitably diluted and besides contains kanthogenic light metal salt, is used. If the plate has to be washed out for any reason, this is done with pure solvents, for instance benzene, benzol or the like, and the plate can be etched in this washed out state with a liquid preferably of the following composition.-
  • the liquid has always the property to render one of the metals, in this instance the brass, extraordinarily receptive to fat. whereas the second metal, nickelmagnesium, is strongly etched lithogralphically and thereby becomes strongly ink-repellent.
  • the etch to be used for the above combination brass-nickel-magnesium is composed as follows:
  • Example 3 For a printing plate, the image portions of which consist of copper and the level portions of iron, asolution of the following composition is used:
  • Process of producing printing plates having an image metal portion of zinc and a level metal portion of nickel comprising treating said plates with a solution comprising approximately 1000 cubic centimeters of water, 10 to grams of sodium hydroterricyanide, 2 to 8 grams of oxalic acid and 1 to 10 grams of diphenylsulfourea.

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  • Printing Plates And Materials Therefor (AREA)
US356190A 1939-09-14 1940-09-10 Method of producing printing plates Expired - Lifetime US2369567A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH0160581 1939-09-14
DEH0000415 1940-08-31

Publications (1)

Publication Number Publication Date
US2369567A true US2369567A (en) 1945-02-13

Family

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Family Applications (1)

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US356190A Expired - Lifetime US2369567A (en) 1939-09-14 1940-09-10 Method of producing printing plates

Country Status (5)

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US (1) US2369567A (en))
BE (1) BE439146A (en))
CH (1) CH220509A (en))
FR (1) FR873405A (en))
NL (1) NL59210C (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582347A (en) * 1945-03-08 1952-01-15 Columbia Ribbon & Carbon Planographic printing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2582347A (en) * 1945-03-08 1952-01-15 Columbia Ribbon & Carbon Planographic printing

Also Published As

Publication number Publication date
NL59210C (en))
BE439146A (en))
FR873405A (fr) 1942-07-08
CH220509A (de) 1942-04-15

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