US2927858A - Method of producing printing surfaces - Google Patents

Method of producing printing surfaces Download PDF

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Publication number
US2927858A
US2927858A US658090A US65809057A US2927858A US 2927858 A US2927858 A US 2927858A US 658090 A US658090 A US 658090A US 65809057 A US65809057 A US 65809057A US 2927858 A US2927858 A US 2927858A
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United States
Prior art keywords
gelatine
solution
film
screen
photographic
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Expired - Lifetime
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US658090A
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English (en)
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Mayr Ludwig
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Individual
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Individual
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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
    • G03F7/004—Photosensitive materials
    • G03F7/06—Silver salts

Definitions

  • the covered support port-ions representing an image; of the. object in relief, the. covered spots. being formed: with gelatine- Subsequently the gelatine. forming the. image is hardenedzby' treatment withfa solution containing formaldehyde tannic acid and glycerine. .Such a process is described in U.S. Pate nt No. 2,532,390.
  • the present invention contemplates the provision of a process which overcomes the above noted drawbacks by providing for the disintegration of the unhardened expanded gelatine to such an extent that the small screen elements do not protrude but are slightly depressed. This is achieved in the practice of the invention by:
  • Farmer's Reducer maybe employed for this purpose.
  • Reliefs produced in accordance with the principles of the present invention are immediately usablefor printing.
  • the appropriate adjustment of the temperature and makeup of the treating solution permits the disintegration of silver-free gelatine tosuch extent that the small printing elements do not protrude but are slightly recessed as will be noted more particularly hereinafter.
  • the solution with which the fixed, unhardened photographic material is treated suitably contains an acid to provide'a pH below that of the isoelectric point of the gelatine.
  • a salt is included to provide for controlled swelling of the gelatine and suitably a mixture
  • a buffer acid may be introduced.
  • the solution rate is materiallyaided in an. eflfective controlled" manner by the hydrogen peroxide which functions in thev disintegration of the gelatine Whil e numerous: modifications may be made in the componentspf the bath, the temperatnrepf'thebath. and time of .exposureto thebath, and whileruchwill. depend upon properties of the photographic material such as film thickness, density and the like, conditions may be regulated to provide for the disintegration action in a desired manner and the functioning of the hydrogen peroxide.
  • Figure 1 represents a positive printed through a cross line screen and fixed without hardening
  • Figure 2 represents the positive of Figure stage in the swelling of the gelatine
  • Figure 3 indicates the positive in a swollen condition
  • FIG. 4 illustrates the processed photographic mate- Acetic acid grams 10 Sodium sulfate (crystalline) do Ferric sulfate (crystalline) do 30 Water cc 9.00
  • the solution may be passed through a filter and 50 cc. of concentrated sulfuric acid is added to the clear solution while stirring well.
  • the solution which contains the agents to induce gelatine swelling is then'cooled to room temperature and reacted with about IO'grams of hydrogen peroxide.
  • the addition of the hydrogen peroxide may suitably be in the solid-form, that is, in the form of tablets containing H and urea, for example.
  • the solution thus prepared is preferably permitted to stand over night before treating the photographic material.
  • a bath of the treating solution having a temperature of about 15' C. (59 F.) is prepared and the photographic material bearing a positive image copied through the point screen ( Figure 1) is immersed for about minutes.
  • the photographic mate rial may be lightly rinsed in clear water.
  • the immersion ence of the aqueous solution containing a large amount of water the life will be longer.
  • the hydrogen peroxide functions to insure the disintegration of the gelatine excess.
  • the sulfuric acid and acetic acid provide the pH ,at a potential below the isoelectric point to insureswelling of the gelling-for this purpose other inorg'anic'and organic acids,'including nitric, hydrochloric, phosphoric, may be employed.
  • the ionizable salts, ferric sulfate and sodium sulfate exert control over the swelling; other trivalent and divalent ionizable salts maybe employed.
  • the ionizable salts and the acid "concentration for combination with the hydrogen peroxide may be time will depend to some extent upon the thickness of the photographic material as well as the toning value thereof-but in general an original thickness of 30 microns will increase to about 100 microns.
  • the swollen film ( Figure 2) will in the course of action raise the silver or screen elements ( Figure 3); the gelatine in the areas of higher gelatine concentration will disintegrate to a greater degree however and the smaller screen elements in the product of the treatment will be somewhat recessed below the print plane ( Figure 4).
  • a solution of the agents which induce the swelling and which contain the peroxide may also include farmers Reducer as referred to hercinbcfore.
  • a suitable farmers reducing solution is:
  • a process of preparing a printing block from photographic film comprising a light-sensitive layer of silver halide gelatin emulsion and bearing a positive image thereon copied through a screen, developed and fixed so that the gelatin is substantially unhardened; the steps of subjecting the fixed and unhardened photographic film to an aqueous relief forming solution to eifect swelling'of the gelatin substantially without hardening the gelatin with said solution comprising 10 grams of acetic acid, 90 grams of crystalline sodium sulfate, 30 grams of ferric sulfate, cc. of concentrated sulfuric acid, and about 10 grams of hydrogen peroxide for every 900 cc. of water and the treatment being effective to swell and partially disintegratethe gelatin; rinsing the photographic film in clear water; and subsequently drying the photographic film without intermediate hardening of the gelatin therein.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
US658090A 1956-05-11 1957-05-09 Method of producing printing surfaces Expired - Lifetime US2927858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM30487A DE1030682B (de) 1956-05-11 1956-05-11 Verfahren zur Herstellung gerasterter Reliefdruckformen

Publications (1)

Publication Number Publication Date
US2927858A true US2927858A (en) 1960-03-08

Family

ID=7300982

Family Applications (1)

Application Number Title Priority Date Filing Date
US658090A Expired - Lifetime US2927858A (en) 1956-05-11 1957-05-09 Method of producing printing surfaces

Country Status (6)

Country Link
US (1) US2927858A (de)
BE (1) BE556457A (de)
CH (1) CH324700A (de)
DE (1) DE1030682B (de)
GB (1) GB855198A (de)
NL (2) NL96351C (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178338A (en) * 1938-01-12 1939-10-31 Agfa Ansco Corp Production of gelatin printing reliefs
US2772160A (en) * 1952-03-21 1956-11-27 Eastman Kodak Co Light-detached resists or reliefs for printing plates

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE832100C (de) * 1948-10-03 1952-02-21 Heinrich Heichlinger Verfahren zum Erzeugen von AEtzreliefs aus Kolloidschichten durch Herausloesen des bildmaessig verteilten Silbers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178338A (en) * 1938-01-12 1939-10-31 Agfa Ansco Corp Production of gelatin printing reliefs
US2772160A (en) * 1952-03-21 1956-11-27 Eastman Kodak Co Light-detached resists or reliefs for printing plates

Also Published As

Publication number Publication date
DE1030682B (de) 1958-05-22
NL212755A (de)
NL96351C (de)
GB855198A (en) 1960-11-30
BE556457A (de)
CH324700A (de) 1957-10-15

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