US1525531A - Halftone plate and process of producing same - Google Patents

Halftone plate and process of producing same Download PDF

Info

Publication number
US1525531A
US1525531A US537255A US53725522A US1525531A US 1525531 A US1525531 A US 1525531A US 537255 A US537255 A US 537255A US 53725522 A US53725522 A US 53725522A US 1525531 A US1525531 A US 1525531A
Authority
US
United States
Prior art keywords
plate
halftone
producing same
covering
lithographic printing
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 - Lifetime
Application number
US537255A
Inventor
Bassist Ellis
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.)
GEORGE H KINGSLEY
Original Assignee
GEORGE H KINGSLEY
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
Application filed by GEORGE H KINGSLEY filed Critical GEORGE H KINGSLEY
Priority to US537255A priority Critical patent/US1525531A/en
Priority to DEB117996D priority patent/DE433044C/en
Priority to GB3406/25A priority patent/GB251697A/en
Application granted granted Critical
Publication of US1525531A publication Critical patent/US1525531A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • G03F3/00—Colour separation; Correction of tonal value
    • G03F3/02—Colour separation; Correction of tonal value by retouching

Definitions

  • the invention relates to the art of ing a negative (positive) plate for use in making lithographic printing plates, and to the novel negative .or positive produced thereby. It has for its object to simplify the procedure now in common use and to greatly reduce the number of steps now required in the preparation of a negative of this character.
  • a further object of the invention consists in a novel form of halftone negative or positive plate, which is finished as to tone and color values and is suitable for making directly therefrom the zinc or aluminum printing plate used in lithographic printing.
  • Fig. 1 represents a transparent base upon which a photographic reproduction is to be provided.
  • Fig. 2 represents the said base with a covering of opaque material provided thereon.
  • Fig. 3 represents a similar view, but in which said covering has been coated with a sensitized emulsion.
  • Fig. 4 represents the reproduction after exposure and fixing.
  • Fig. 5 is a similar view after the preliminary etching operation.
  • Fig. 6 represents the negative in its final form, ready for use in making a lithographic printing plate therefrom.
  • 10 designates a suitable transparent base, preferably of glass; but whichmay consist of a film of any suitable material as gelatine or celluloid, or paper or other material in the nature of a plate and transparent.
  • This plate is provided on one surface with a thin opaque covering 11 as of copper, zinc or other suitand a resident of West? prepar material is employed, a
  • a able material which may be deposited thereon, for example by electrochemical means, 0.1, as a sheet thereof glued thereto.
  • a thin coating 12, (Fig. 3) of a sensitized emulsion such as the bichromate glue solution commonly employed by photoengravers.
  • a sensitized emulsion for example composed of fish glue, chromic acid, water and ammonium bichromate. flowed uniformly thereovcr and allowed to dry thereon.
  • the plate thus prepared is exposed to light, face to face with a suitable halftone positive (negative), then bathed in cold water and washed with spray of water. This results in the dissolution and removal of the unexposed portions of those areas of the sensitized emulsion on the plate which were under the dark areas of the positive during exposure.
  • the remaining portions 13.. (Fig. 4) are fixed thereby, and are allowed to dry and harden.
  • the fixed portions 13 are then subjected to heat to indurate the field. as by burning in with gas flame to carbonize the fixed glue solution and make it thoroughly resistant to the etching solution subsequently applied. ⁇ Vhen a base of inflammable cold treatment may be applied for this purpose.
  • the plate is then etched, as by bathing in any wellknown etching solution. which will cut thru to the transparent base 10 and outline the design on the transparent bed or support.
  • the plate may then be subjected to further operations, including etching and re-etching to correct the same, by staging, as to tone and color values, as is well understood in the art.
  • the operations may be repeated, if required, a suitable acid resisting substance. such as asphaltum varnish being applied to the finished portions.
  • a finished halftone plate for use in making directly therefrom lithographic printing plates comprising a transparent base, and an etched, opaque, metallic covering with exposed and tone and color value corrected photographic surface, portions of the metallic covering being absent to outline the desi n to' be reproduced.

Description

Feb. 10. 1925.
1,525,531 E. BASSIST HALFTONE PLATE AND PROCESS OF PRODUCING SAEE Original Filed Feb. 17, N22
" WWW Exposed+ Fixed Surface 5 ab 1 (I!!!Ill II)lllllrldllllllllllI]!!!IIIIIIIIIII IIIll/lI l/Illlllrlllzrllltllllll Surface Corrected forTone+Col0r I Snow WM Ellis Basz'sl Patented Feb. 10, 1925.
ELLIS BASSIST, OF WESTWOOD, NEW JERSEY, ASSIGNOR TO GEORGE H. KINGSLEY,
OF NEW YORK, N. Y.
HALFTONE PLATE AND PROCESS OF PRODUCING SAME.
Application filed February 17, 1922, Serial No. 537,255.
To all whom it may concern:
Be it known that I, ELLIS BASSIST, a citizen of Hungary, wood, in the county of Bergen and State of Xew Jersey, have invented certain new and useful Improvements in Halftone Plates and Processes of Producing Same, of which the following is a specification.
The invention relates to the art of ing a negative (positive) plate for use in making lithographic printing plates, and to the novel negative .or positive produced thereby. It has for its object to simplify the procedure now in common use and to greatly reduce the number of steps now required in the preparation of a negative of this character.
A further object of the invention consists in a novel form of halftone negative or positive plate, which is finished as to tone and color values and is suitable for making directly therefrom the zinc or aluminum printing plate used in lithographic printing.
The nature of the invention, however, will best be understood when described in connection with the accompanying drawings which are diagrammatic views illustrating the invention, and in which Fig. 1 represents a transparent base upon which a photographic reproduction is to be provided.
Fig. 2 represents the said base with a covering of opaque material provided thereon.
Fig. 3 represents a similar view, but in which said covering has been coated with a sensitized emulsion.
Fig. 4 represents the reproduction after exposure and fixing.
Fig. 5 is a similar view after the preliminary etching operation.
Fig. 6 represents the negative in its final form, ready for use in making a lithographic printing plate therefrom.
Similar characters of reference designate corresponding parts thruout the several views.
Referring to the drawings, 10 designates a suitable transparent base, preferably of glass; but whichmay consist of a film of any suitable material as gelatine or celluloid, or paper or other material in the nature of a plate and transparent. This plate is provided on one surface with a thin opaque covering 11 as of copper, zinc or other suitand a resident of West? prepar material is employed, a
Renewed June 27, 1924.
able material which may be deposited thereon, for example by electrochemical means, 0.1, as a sheet thereof glued thereto. Over sainc is provided a thin coating 12, (Fig. 3) of a sensitized emulsion such as the bichromate glue solution commonly employed by photoengravers. To this end, the surface 11 is carefully cleaned and a sensitized emulsion, for example composed of fish glue, chromic acid, water and ammonium bichromate. flowed uniformly thereovcr and allowed to dry thereon.
In accordance with the invention, the plate thus prepared is exposed to light, face to face with a suitable halftone positive (negative), then bathed in cold water and washed with spray of water. This results in the dissolution and removal of the unexposed portions of those areas of the sensitized emulsion on the plate which were under the dark areas of the positive during exposure. The remaining portions 13.. (Fig. 4) are fixed thereby, and are allowed to dry and harden. The fixed portions 13 are then subjected to heat to indurate the field. as by burning in with gas flame to carbonize the fixed glue solution and make it thoroughly resistant to the etching solution subsequently applied. \Vhen a base of inflammable cold treatment may be applied for this purpose.
The plate, is then etched, as by bathing in any wellknown etching solution. which will cut thru to the transparent base 10 and outline the design on the transparent bed or support. The plate may then be subjected to further operations, including etching and re-etching to correct the same, by staging, as to tone and color values, as is well understood in the art. The operations may be repeated, if required, a suitable acid resisting substance. such as asphaltum varnish being applied to the finished portions.
In this manner. a finished negative of a positive. Fig. f, orthe reverse as the case may be. is secured and which is suitable for direct reproduction upon a zinc or aluminum plate andout of which the final lithographic printing plates are made in manner well understood. Thereby. a number of steps of an intricate and highly technical nature, as well as a number of plates, are eliminated and a very satisfactory re-etched or color corrected halftone negative obtained.
. I claim 1. The process of preparing a plate for use in making lithographic printing plates, which consists in covering a base of transparent material with an opaque substance,
sensitizing the surface of said covering, ex-
posing the sensitized surface "to light thru the object to be reproduced and fixing the exposed portion, removing the portions of'the opaque coating under the unexposed portion and correcting for the desired tone and color values.
2. The process of preparing a plate for use in making lithographic printing plates, which consists in coating 2. base of glass with an opaque substance, sensitizing the surface of said covering, exposing said surface to light thru the object to be reproduced and fixing the exposed portion, etching away the opaque covering at the line); posed portion, and correcting the plate for tone and color values.
3. The process of preparing a plate for use in making lithographic printing plates, which consists in covcring a base of transparent material with metal, sensitizing the surface of said metal, exposing said sensiin making lithographic printing plates,
which consists in covering a base of glass with metal, sensitizing the surface of the metal, exposing said-sensitized surface to light thru the object to be reproduced and I fixing the exposed portion, indurating same,
etching away the metal at the unexposed portion, and correcting the plate for tone and color values. I
5. A finished halftone plate for use in making directly therefrom lithographic printing plates, comprising a transparent base, and an etched, opaque, metallic covering with exposed and tone and color value corrected photographic surface, portions of the metallic covering being absent to outline the desi n to' be reproduced.
Signe at New York, in the county of New York and State of New York, this 10th day of February, A. D. 1922.
ELLIS BASSIST.
US537255A 1922-02-17 1922-02-17 Halftone plate and process of producing same Expired - Lifetime US1525531A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US537255A US1525531A (en) 1922-02-17 1922-02-17 Halftone plate and process of producing same
DEB117996D DE433044C (en) 1922-02-17 1925-02-05 Process for the production of master copies for the production of lithographic printing forms
GB3406/25A GB251697A (en) 1922-02-17 1925-02-06 Improvement in photographic halftone plate and process of producing same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US537255A US1525531A (en) 1922-02-17 1922-02-17 Halftone plate and process of producing same

Publications (1)

Publication Number Publication Date
US1525531A true US1525531A (en) 1925-02-10

Family

ID=24141882

Family Applications (1)

Application Number Title Priority Date Filing Date
US537255A Expired - Lifetime US1525531A (en) 1922-02-17 1922-02-17 Halftone plate and process of producing same

Country Status (2)

Country Link
US (1) US1525531A (en)
GB (1) GB251697A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069265A (en) * 1959-03-11 1962-12-18 Simmonds Aerocessories Inc Method for photographically producing light balanced dial indicators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069265A (en) * 1959-03-11 1962-12-18 Simmonds Aerocessories Inc Method for photographically producing light balanced dial indicators

Also Published As

Publication number Publication date
GB251697A (en) 1926-05-06

Similar Documents

Publication Publication Date Title
US2459129A (en) Production of photographic stencils
US2244187A (en) Process of molding printing cuts from photographic plates
US1525531A (en) Halftone plate and process of producing same
US2548565A (en) Method of making relief printing plates
US1311275A (en) Electrolytic pk-ocess for making stencils
US1957433A (en) Method of making a photographic printing plate
JPS6357771B2 (en)
US1567333A (en) Process for producing reproduction means for book printing and the like
DE433044C (en) Process for the production of master copies for the production of lithographic printing forms
US1938290A (en) Photomechanical printing
US1477866A (en) Producing printing surfaces
US1349956A (en) Color-filter negative and the process of preparing same
US3023099A (en) Photographic process for etching scribing media
US1581012A (en) Obtaining by alpha single operation alpha correct exposure of plates and culinders comprising half-tones accompanied by test or line drawings for helio engraving
US2084792A (en) Method and means for reproducing and printing wood grains and the like
JPS6154212B2 (en)
US684208A (en) Preparing surfaces for engraving by sand-blast or acid-etching process and in engraving such surfaces.
US3156562A (en) Reproduction of photographic images on ceramic surfaces
US1574358A (en) Process of optical copying
US1907816A (en) Relief engraving
GB473446A (en) A process for the manufacture of printing forms by projecting autotypes
US3143415A (en) Method of preparing positives comprising a hydrophilic nitrocellulose layer for printing and platemaking use
GB196008A (en) Improvements in and relating to the production of photomechanical printing surfaces
US3175908A (en) Production of relief printing plates
US862805A (en) Art of producing printing-surfaces for use in printing-presses.