US1034745A - Preparation of printing-plates. - Google Patents

Preparation of printing-plates. Download PDF

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Publication number
US1034745A
US1034745A US45592408A US1908455924A US1034745A US 1034745 A US1034745 A US 1034745A US 45592408 A US45592408 A US 45592408A US 1908455924 A US1908455924 A US 1908455924A US 1034745 A US1034745 A US 1034745A
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plate
film
printing
plates
preparation
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US45592408A
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Max Ullmann
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/40—Treatment after imagewise removal, e.g. baking

Definitions

  • the base 1 of the plate carries thereon the sensitive film 2 which is represented as having been exposed to'light, the design to be reproduced being the unexposed parts 3 of the ,film.
  • the film After exposure the film is developed, which may be done by immersing the plate in a bath of dilute nitric acid, which causes the removal of the unexposed parts 3 of the film, these partsbeing the lines and points of the drawing, thus forming the depression 4.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

M. ULLMANN.
PREPARATION OF PRINTING PLATES. APPLIOATION FILED 00122, 1908.
1 34 75 Patented Aug. 6, 1912.
WITNESSES.
INENTOI? Arm/Mrs. I
MAX ULLMANN, OF ZWICKAU, GERMANY.
PREPARATION OF PRINTING-PLATES.
Specification of Letters Patent.
Patented Aug. e, 1912.
Application filed October 2, 1908. Serial No. 455,924.
To all whom it may concern:
Be it known that I, MAX ULLMANN, a citizen of the Empire of Germany, residing in Zwickau, in the Kingdom of 'Saxony, in said Empire, have invented certain new and useful Improvements in the Preparation of Printing-Plates, of which the following is a specification.
This invention relates to an improvement in the process of treating printing plates by direct exposure in the photographic camera and described in the application Serial No.
400,693 by the same inventor, and has for its object to provide a special treatment of the plates after exposure and develo ment, in order to procure specially sharp plctures.
The first part of the process consists in preparing a printing plate byrendering its operative surface sensitive to light by coating the surface with a sensitive solution film, exposing the sensitive film whereby the exposed parts are rendered resistive to acid, then developing the plate whereby the unexposed parts are removed and thus depressed, and the exposed parts remain in relief. The plate is then dried'and the depressed portions filled with fat color or ink. This much of the process is the same as that which forms the subject of the invention of my application hereinbefore mentioned. After this much of the process has been performed a test print, or-proof, may be made and if the fine lines do not show quite sharp and distinct the process is continued, and this continuation of the process constitutes the present invention. The ink is placed in the depressions as in the former application and the plate resubmitted to the development. The plate is then dried and the depressions filled, with ink as before and the plate may be printed from. It will be found that the roughness has been removed from the fine lines.
film, a part of which has been exposed to light, Figs. 2 and 3 show sectional perspective views ofthe film taken on the line XX of Fig. 1 during the various steps of the process. Fig. 2 shows the plate after being developed and rolled in ink, and Fig. 3 shows the plate ready for printing.
The base 1 of the plate carries thereon the sensitive film 2 which is represented as having been exposed to'light, the design to be reproduced being the unexposed parts 3 of the ,film.
The film 2 may be composed of a coating of liquefied gelatin and chromate of ammonium with the addition of ammonia and is rendered resistive to acid by exposure to light.
After exposure the film is developed, which may be done by immersing the plate in a bath of dilute nitric acid, which causes the removal of the unexposed parts 3 of the film, these partsbeing the lines and points of the drawing, thus forming the depression 4.
The plate is then dried. The plate is then rolled in fat color or ink, and the ink is then wiped from the face of the film. After this, the plate is again immersed in the developing bath, thus completing the plate, after which the plate may be rolled in ink, as shown in Fig. 2, and then wiped ofi, leaving the plate ready for printing, as shown in Fig. 3.
Having thus described my invention, I claim as new and desire to secure by Letters Patent:
The herein described process of preparing a printing plate, consisting in rendering the operative surface of the plate sensitiveto light by coating it with a film comprising liquefied gelatin and chromate of ammonium with addition of ammonia, exposing the plate whereby the exposed parts of the film are rendered resistive to acid, developing the plate in a bath of dilute nitric acid whereby the unexposed parts of the film are removed thus forming depressions in the film at said parts, drying the plate, rolling the film with ink, again developing the plate in a bath of dilute nitric acid, and drying the plate for use.
The foregoing specification signed at Berlin, Germany, this sixteenth day of September, 1908.
I MAX ULLMANN.
US45592408A 1908-10-02 1908-10-02 Preparation of printing-plates. Expired - Lifetime US1034745A (en)

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US45592408A US1034745A (en) 1908-10-02 1908-10-02 Preparation of printing-plates.

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US45592408A US1034745A (en) 1908-10-02 1908-10-02 Preparation of printing-plates.

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US1034745A true US1034745A (en) 1912-08-06

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