US1789138A - Printing plate and process of making same - Google Patents

Printing plate and process of making same Download PDF

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Publication number
US1789138A
US1789138A US295266A US29526628A US1789138A US 1789138 A US1789138 A US 1789138A US 295266 A US295266 A US 295266A US 29526628 A US29526628 A US 29526628A US 1789138 A US1789138 A US 1789138A
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US
United States
Prior art keywords
plate
printing
image
light
coating
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
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US295266A
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English (en)
Inventor
Rudolph A Glaser
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US295266A priority Critical patent/US1789138A/en
Priority to GB9869/29A priority patent/GB316210A/en
Priority to FR672611D priority patent/FR672611A/fr
Priority to BE360299D priority patent/BE360299A/xx
Priority to US370629A priority patent/US1843872A/en
Application granted granted Critical
Publication of US1789138A publication Critical patent/US1789138A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Definitions

  • This invention relates to printing plates and photomechanical processes of making them and aims generally to improve such plates and processes.
  • the invention is particularly advantageous as applied to large size plates for odset or direct lithographieprinting and is applicable for pictorial color .work in any number of desired colors, it is to be understood that printing plates and processes embodying the invention are applicable to other types of printingiand reproduction.
  • the invention aims to secure the sharp detail and truthful representation of the colors and tones of the original copy when applied to one color ory multi-color printing, and to improve the brilliancy and tone values of the printed copies as compared with those made by existing commercial processes and plates; 'to shorten the time and to reduce the cost heretofore required4 to make a set of color printing plates; and to produce a durable printing surface that will give a large number of impressions Ibefore losing its sharp detail, and that may be readily restored for further printing by mechanical means.
  • the invention will be described as applied to ⁇ an intaglioplanographie printing plate adapted for use in offset lithographie printing, although it is understood that the inventionv is applicable to printing by direct lithographie printing, photogravure,l rotogravure, rotary photo- ⁇ gravure and other processes.
  • the intaglio-planogra'phic type of plate referred to herein is characterized by having -the ink receiving surface defined by a greasy condition that inheres in the grain of the metal and neither flows nor spread-s, and that is so intimately connected to the metal as not to be removable therefrom by washing or scrubbing, as distinguished from plano- -graphic plates having the image aiixed to the surface of the plate by a transfer process or developed upon or in a coating applied to the surface of the plate.
  • Figs. 1,l 2 and 3 indicate diagrammatically the successive steps'taken in the development of the image and treatment of the plat-e to form a permanent print'- ing surface.
  • a suitable -sheet 10 as for instance, a metal plate of zinc, aluminum or other suit.- able metal or alloy,'is lightly grained on its printing sideto improve its affinity for Water but not suiiieiently to form a printing pattern,and is given a very thin coating 11 of light sensitive "material, suehas biehromated gelatine or albumen, which is dried by whirling or otherwise.
  • the coating 11 is exposed to light for a short interval to fix it, whereupon it is wetted and coated again preferably with sensitized albumen, the second coating 12 being spread uniformly thin throughout and dried by whirling or otherwise.
  • the coated plate is thenA ready to be exposed to aetinic light rays passed through a' transparent image and a sri-called lithographie screen in a suitable apparatus, as, for example, thatdescribed in Pifer Patent No. 1,347,824, dated July 27, 1920, for photographic apparatus, wherein the metal plate may be supported in the holdenin place of the sensitized transfer sheet therein described. If a screen produced negative, such asa halfitone negative forl example, beused for the transparent image, a lithographie screen is not necessary..
  • Other types of apparatus may be employed, as the invention contemplates projecting or photographing the image tothe coated plate by actinic light rays, in any suitable manner.
  • rlhe source of the light rays is preferably a carbon are lalnp so constructed that the positive carbon is disposed in axial alinement with the direction of the projected rays, and is caused to revolve constantly so as to maintain a crater at its pointwhich holds a small volume of incandescent gas or vaporized metals produced by the are..
  • the coated plate will be affected where struck by suitable light rays penetrating the coating as is indicated in Fig. 1, where the non-light-struck portions 13 and light-struck portions 1-1 are clearly indicated.
  • the intensity and character of the light rays have an important' bearing on the speed of .the exposure and the character of the printing plate produced, and I have discovered that a rotating carbon lamp produces the most satisfactory results. lVhethcr this is due to peculiar properties of-the pro]ected ray or to increased intensity of the ray 1s not known to me.
  • the exposed Vplates are flowed with a developing and penetrating compositionA containing a Water repelling substance, preferably an asphaltum mixture containing a greasy ink if the plate is to be used in lithographie printing, which composition is spread evenly and allowed to dry.
  • a developing and penetrating compositionA containing a Water repelling substance, preferably an asphaltum mixture containing a greasy ink if the plate is to be used in lithographie printing, which composition is spread evenly and allowed to dry.
  • a composition suitable for the purpose is as follows:
  • the effect of the asphaltum mixture on the light-struck portions 14 of the Coating 12 and the coating 11 is to sink through and change its character where ⁇ there are printing dots inthe image, leaving the non-lightstrnck portions 13 unaffected to form the water dots on the plate which do not take ink, as indicated in Fig. 2, wherey patches of asphaltum mixture 15 are deposited upon the metal except where the latter 1s protected by the non-light-struck portions 13.
  • the asphaltum mixture adheres to the metal and penetrates or is embedded beneath or 1n its surface, forming a sunken image composed of dots when a lithographie grain screen or screen produced image is used. 'l ⁇ he c henncal action, if any, of the asphaltum mixture upon the. surface of the metal plate is not.
  • said light-affected areas being of permanent character so that the prmtmg image, 1f removed, may be rebullt according to the orig- .inal image by retreatment with the asphaltumnmaterial.
  • a metal intaglio-planographic printing plate having a finely grained surface capable of receiving Water and light-struck areas corresponding -to a photographic image, said plate, Where affected by light, being covered by hardened bituminous ink-receiving portions impregnated in said'metal plate and constituting a printing image sunken therein.

Landscapes

  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Methods (AREA)
  • Printing Plates And Materials Therefor (AREA)
US295266A 1927-11-23 1928-07-25 Printing plate and process of making same Expired - Lifetime US1789138A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US295266A US1789138A (en) 1928-07-25 1928-07-25 Printing plate and process of making same
GB9869/29A GB316210A (en) 1928-07-25 1929-03-27 Improvements in and relating to printing plates and processes of making same
FR672611D FR672611A (fr) 1928-07-25 1929-04-05 Planche à imprimer et son procédé de fabrication
BE360299D BE360299A (enrdf_load_stackoverflow) 1928-07-25 1929-05-01
US370629A US1843872A (en) 1927-11-23 1929-06-13 Process of making printing plates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US295266A US1789138A (en) 1928-07-25 1928-07-25 Printing plate and process of making same

Publications (1)

Publication Number Publication Date
US1789138A true US1789138A (en) 1931-01-13

Family

ID=23136964

Family Applications (1)

Application Number Title Priority Date Filing Date
US295266A Expired - Lifetime US1789138A (en) 1927-11-23 1928-07-25 Printing plate and process of making same

Country Status (4)

Country Link
US (1) US1789138A (enrdf_load_stackoverflow)
BE (1) BE360299A (enrdf_load_stackoverflow)
FR (1) FR672611A (enrdf_load_stackoverflow)
GB (1) GB316210A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070008A (en) * 1959-02-02 1962-12-25 William C Huebner Oxide image printing plate
US3166421A (en) * 1961-06-29 1965-01-19 American Zinc Inst Inc Method and composition for developing lithographic plates

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070008A (en) * 1959-02-02 1962-12-25 William C Huebner Oxide image printing plate
US3166421A (en) * 1961-06-29 1965-01-19 American Zinc Inst Inc Method and composition for developing lithographic plates

Also Published As

Publication number Publication date
BE360299A (enrdf_load_stackoverflow) 1929-06-29
FR672611A (fr) 1930-01-04
GB316210A (en) 1930-08-27

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