US940808A - Method of making half-tone plates. - Google Patents

Method of making half-tone plates. Download PDF

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Publication number
US940808A
US940808A US36064007A US1907360640A US940808A US 940808 A US940808 A US 940808A US 36064007 A US36064007 A US 36064007A US 1907360640 A US1907360640 A US 1907360640A US 940808 A US940808 A US 940808A
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US
United States
Prior art keywords
plate
light
film
plates
transparency
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
US36064007A
Inventor
John Hartnett Jr
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.)
HARTNETT VULCOGRAPH Co OF BALTIMORE CITY
Original Assignee
HARTNETT VULCOGRAPH Co OF BALTIMORE CITY
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 HARTNETT VULCOGRAPH Co OF BALTIMORE CITY filed Critical HARTNETT VULCOGRAPH Co OF BALTIMORE CITY
Priority to US36064007A priority Critical patent/US940808A/en
Application granted granted Critical
Publication of US940808A publication Critical patent/US940808A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • This invention relates to an improved method of making printing plates of the kind commonly known as half-tone plates.
  • Thisclass of plates have usually been made with the aid of a screen but by my improved process the screen is dispensed with and the cost of manufacture of the plates very'inuc'h redu'ced.
  • the process comprises the following steps and procedure. I first prepare a solution of pure crude rubber by dissolving rubberin any suitable solvent, and add to this solution a small percentage of asphaltum or coal tar. 'A smooth metal plate preferably a copper plate, is coated with a film of the above solution and then thoroughly dried. Substantially all moisture should-be expelled from the film and the plate may be.
  • the preparation of the solution and the coating of the plate should be performed in a dark room and the plate should be kept away from light until used.
  • the metalplate thus sensitized is placed in a suitable frame face to face with a transparency (usually a glass negative) of the object to be represented on a'half-tone plate and the transparency is then exposed to the light, either natural or, artificial.
  • the time of exposure will depend upon the nature of the transparency, the intensity of. the light, and the eit'ect which it is desired to produce on-the plate.
  • the 'asphaltum or coal tar in the film will be rendered soluble in acetone in proportion to the amount of light to which it is subjected.
  • the plate After exposure the plate is developed in an acetone bath which will dissolve out the asphaltum or coal tar and more or less of the rubber on those portions of the plate that have been subjected to the light and in proportion to the amount of light the difi'erent parts of the plate havereceived. This will leave the difierent parts of the film onthe plate more or less porous in direct proportion tothe, amount of light which they have recelved through the transparency.
  • the plate thus developed is subjected to any 'suitable-etch-' produce the subject of the negative or other.
  • a method ofmaking half-tone -plates which consists in coating the plate with pure rubber containing-a small percentage of material adapted to be rendered soluble by the action of light, exposing said plate to the action of light passing through a transparency of the object to be produced, and then dlssolving out said material to render the coating porous, and finally etching the plate through the pores of the film with a suitable material.
  • a -method of making half-tone plates which consists in coating a metal plate with a film ofrubber containing a small percentage of asphaltum or'coal'tar, subjecting said film to the action of light passing through a transparency of the object to be reproduced, subjecting the film to an acetone bath to render the same porous, and finally subjecting the porous film to a suitable etching materlal.

Description

UNITED snares PATENT FFI Joan nanrnnrnjaa, or wear" Annineron, MARYLAND, JA'SSTGNSR To mammal-I vuLcoeaArH COMPANY or BALTIMORE CITY, or munitions, MARYLAND, A con,- T
PORATION F MARYLAND. I v
Manson or MAKING HALF-TONE PLATES.
No Drawing.
' Specification of Lettersrate'nt. I Patej 'bgd Novgi23 Application filed March 5, 1907; serial No. 360,640,.
"To am 'it may concem;
. Be it known that I, JOHN HARTNET '],'J1.,
a citizen of the United States, and residing following'is a specification.
This invention relates to an improved method of making printing plates of the kind commonly known as half-tone plates. Thisclass of plates have usually been made with the aid of a screen but by my improved process the screen is dispensed with and the cost of manufacture of the plates very'inuc'h redu'ced.- The process comprises the following steps and procedure. I first prepare a solution of pure crude rubber by dissolving rubberin any suitable solvent, and add to this solution a small percentage of asphaltum or coal tar. 'A smooth metal plate preferably a copper plate, is coated with a film of the above solution and then thoroughly dried. Substantially all moisture should-be expelled from the film and the plate may be.
warmed or heated to a suflicient degree for this purpose. The preparation of the solution and the coating of the plate should be performed in a dark room and the plate should be kept away from light until used. The metalplate thus sensitized is placed in a suitable frame face to face with a transparency (usually a glass negative) of the object to be represented on a'half-tone plate and the transparency is then exposed to the light, either natural or, artificial. The time of exposure will depend upon the nature of the transparency, the intensity of. the light, and the eit'ect which it is desired to produce on-the plate. The 'asphaltum or coal tar in the film will be rendered soluble in acetone in proportion to the amount of light to which it is subjected. After exposure the plate is developed in an acetone bath which will dissolve out the asphaltum or coal tar and more or less of the rubber on those portions of the plate that have been subjected to the light and in proportion to the amount of light the difi'erent parts of the plate havereceived. This will leave the difierent parts of the film onthe plate more or less porous in direct proportion tothe, amount of light which they have recelved through the transparency. The plate thus developed is subjected to any 'suitable-etch-' produce the subject of the negative or other.
transparency. Y
Itwill be evident that this process may be varied in detail and different results produced, as may bedesir'ed." Thus the percentage of asphaltum or coal tar, in the rubber solution may be varied; also the thickness of the-coating of the sensitized plate, whichmay consist in one or' more layers or films. The result may also be .varied by varying the time of exposure to light and the time of treatment in a bath.- It is to be understood that while asphaltum and coal tar have been particularly specified herein any equivalent material which is sensitive to light and which may be dissolved out of the film after exposure to light may be used.
' Having described my invention what I claim and desire to secure by Letters Patent is,
1. A method ofmaking half-tone -plates which consists in coating the plate with pure rubber containing-a small percentage of material adapted to be rendered soluble by the action of light, exposing said plate to the action of light passing through a transparency of the object to be produced, and then dlssolving out said material to render the coating porous, and finally etching the plate through the pores of the film with a suitable material.
2. A -method of making half-tone plates which consists in coating a metal plate with a film ofrubber containing a small percentage of asphaltum or'coal'tar, subjecting said film to the action of light passing through a transparency of the object to be reproduced, subjecting the film to an acetone bath to render the same porous, and finally subjecting the porous film to a suitable etching materlal.
plate to thoroughly dry the film, subjecting saidhfilqn to t e action of light passing through a transparency of the object to be reproduced, subjecting the 'filmto an acetone bath to render the same porous, and
finally subjecting the PQlOllS film to a suit- 10 able etching materia In testimony whereof I aflix my signal iture in'presence of two Witnesses.
JOHN HARTN ETT, JR.
Witnesses; WILLIAM B. Emma,
-WM. E. Fmoson.
US36064007A 1907-03-05 1907-03-05 Method of making half-tone plates. Expired - Lifetime US940808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US36064007A US940808A (en) 1907-03-05 1907-03-05 Method of making half-tone plates.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36064007A US940808A (en) 1907-03-05 1907-03-05 Method of making half-tone plates.

Publications (1)

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US940808A true US940808A (en) 1909-11-23

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US36064007A Expired - Lifetime US940808A (en) 1907-03-05 1907-03-05 Method of making half-tone plates.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713831A (en) * 1969-08-22 1973-01-30 Staley Mfg Co A E Coating composition comprising photoactivator and film-forming organic material for powder development

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3713831A (en) * 1969-08-22 1973-01-30 Staley Mfg Co A E Coating composition comprising photoactivator and film-forming organic material for powder development

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