US1659949A - Engraving process - Google Patents

Engraving process Download PDF

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Publication number
US1659949A
US1659949A US685056A US68505624A US1659949A US 1659949 A US1659949 A US 1659949A US 685056 A US685056 A US 685056A US 68505624 A US68505624 A US 68505624A US 1659949 A US1659949 A US 1659949A
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US
United States
Prior art keywords
film
portions
negative
silver
gelatinous
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Expired - Lifetime
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US685056A
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English (en)
Inventor
Raymond N Getches
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to US685056A priority Critical patent/US1659949A/en
Priority to DEG72303D priority patent/DE501259C/de
Priority to FR647712D priority patent/FR647712A/fr
Application granted granted Critical
Publication of US1659949A publication Critical patent/US1659949A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/20—Screening processes; Screens therefor using screens for gravure printing

Definitions

  • My invention relates particularly to engraving of metallic orother plates or cylinders for use in mechanical prlnting, and is especially adapted for use in connection with engraving of copper cylinders or flat plates for use in rotary or flat bed printing presses, whereby photogravure prints may be c conomically and quickly produced.
  • My improved process is also applicable to the production of line prints where half tones or medium lights or shadows are not present. It is particularly applicable to the re roduction of toned pictures and photograp s having innumerable variations of light and shade or to the reproduction of a composite consisting of combined pictorial and printed matter where both line and 'type Work are to be reproduced with a photograph or other pictorial print.
  • a negative photograph is made on celluloid or glass from pictures and printed matter to be reproduced, it being necessary to separately photograph the pictures and the line Work or printed matter andpassemble the same by pasting or otherwise attaching to the Celluloid or glass backing;
  • a positive photographic print is made on transparent material, such as Celluloid or glass;
  • the positive so made is printed on the so-called carbon tissue which is a gelatine coated paper sensitized with potassium bichromate, or other similar sensitizing material. This printing is done by exposure of the carbon tissue to light, through the usual ruled screen and then through the composite positive. This last printing operatipn is known as the carbon printing process.
  • the exposed carbon tissue is applied when wet,
  • the type or line work is firstletched by the use of the usual ferrie chloride after covering the halt ⁇ tone portions with asphaltum. The etched portions 'are then Washed and dried and the asphaltum re I moved from the half tone or picture portions.
  • Fig. 1 indicates the various surfaces produced in the successive steps of one form of my improved process when used in the production of a composite line and halftone gravure print
  • Fig. 2 indicates the successive steps when the screening is introduced at another pointv in the process
  • Fig. 3 indicates the successive steps when the screening is produced only on the plate or cylinder to be engraved.
  • this composite negative print is then squeegeed face to face with a sheet of f gelatinized and sensitized paper (g) known as carbon tissue similar to that used in the previous process above referred to, the bromide negative being Wet with water and the carbon tissue wet with the sensitizing solution when squeegeed together.
  • the sensitizing is accomplished by immersing the carbon tissue for about three minutes in a solution of bichromate of potash-one ounce, potissium-ferricyanide-one ounce, potassium bromide-one ounce, and water-eighty ounces, and after draining for a fraction of a minute, immersing in a solutionv comprising glacial acetic acid-one quarter of an ounce, ydrochloric acid-one quarter of an ounce, formaldehyde (40%)-tive and one half ounces, and water-one hundred and ninety ounces.
  • the cylinder is then etched, (le, c) line work and half tone separately as in theold process or as an' entirety by the use of ferrie chloride without the necessity of separate etching of the .type or line matter and the pictorial matter, as required in the former rocess, since this process gives a thickness o gelatine and resist making it possible to obtainrequired results in one etching.
  • the c linder is then washed and is ready for making the print (VZ, Z), as is usual in the process of rotogravure printing.
  • apiece of sensitized carbon tissue may be exposed to light through the screen' (e.) as above described, then transferred directl to the cylinder or plate. (n). .
  • the insoluble gelatine lines only remain on the surface of the cylinder or plate.
  • the composite negative print, (o) without screen lines, is then squeegeed onto another sheet of carbon-tissue (p) and the gelatine thereof transferred to the cylinder or plate (n), and su er-imposed on the previously applied inso uble screen lines.
  • the insolub e ⁇ ortions of this layer of gelatine are then was ed away, after which the cylinder or plate (g) is ready for etching and printing (r as efore. 1,
  • the steps which comprise placing a negativeimage of the matter to be reproduced having'dark portions and high lights of different densities formed on a film containing chemical substances which are ada ted to produce corresponding. degrees of insolubility in a sensitized gelatinous or similar ilm, in direct contact with such a gelatinous iilm, separating said image from said gelatinous film for a predetermined period, transferring the latter to the surface to be etched, removing all soluble portionsof said gelatinous film, and etching said surface in the presence of its remaining insoluble portion.
  • Va photogra- .vure printing surface which consists in placing a negative silver image of the matter to be reproduced in intimate contact with a gelatinous-film in the presence of a chromate salt, whereby portions of said gelatinous film corresponding to said image are rendered insoluble in direct proportion to the amount of silver present, transferring said film to a metal printing surface, washing away all soluble portions of said film, and etching said surface.
  • the process of producing a photogravure printing surface which comprises the following steps: placing a photographic paper containinw a silver salt, on whicha nega# tive image of the subject'to be reproduced has been projected and developed, in face to face intimate contact with a gelatinous film sensitized and moistened with a solution containing potassium bichromate-one part, potassium ferricyanide-one part, potassium bromide-one part, and water 8() parts, continuing said contact for a predetermined time interval whereby portions of the gelatin film in contact with the negative image are rendered insoluble in direct proportion to the silver present, transferring and squeegeeing said film to the surface to be engraved, washing away all soluble portions of said gelatin and etching said surface in the presence of the remaining gelatin.
  • the process of producing a photogravure printing surface which comprises the following steps: placing a negative silver image on a photographic paper ofthe matter to be reproduced, in intimate contact with a gelatinous film having an insoluble screen formation thereon, said film being sensitized with a solution containing a chromate salt whereby the remaining soluble portions 0f said film are rendered insoluble in direct proportion to the silver present in said image, transferring and placing said film in of said gelatinV contact with the printing surface to be en. graved, dissolving and removing all solubltl portions of said gelatin, and etching said surface inthe presence of the remaining insoluble gelatin.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
US685056A 1924-01-08 1924-01-08 Engraving process Expired - Lifetime US1659949A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US685056A US1659949A (en) 1924-01-08 1924-01-08 Engraving process
DEG72303D DE501259C (de) 1924-01-08 1928-01-19 Verfahren zur Herstellung eines Films zur AEtzung einer Photogravueredruckflaeche
FR647712D FR647712A (fr) 1924-01-08 1928-01-26 Perfectionnements aux procédés de gravure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US685056A US1659949A (en) 1924-01-08 1924-01-08 Engraving process

Publications (1)

Publication Number Publication Date
US1659949A true US1659949A (en) 1928-02-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US685056A Expired - Lifetime US1659949A (en) 1924-01-08 1924-01-08 Engraving process

Country Status (2)

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US (1) US1659949A (fr)
FR (1) FR647712A (fr)

Also Published As

Publication number Publication date
FR647712A (fr) 1928-11-30

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