US1944354A - Photogravure process and metal plate therefor - Google Patents

Photogravure process and metal plate therefor Download PDF

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Publication number
US1944354A
US1944354A US414437A US41443729A US1944354A US 1944354 A US1944354 A US 1944354A US 414437 A US414437 A US 414437A US 41443729 A US41443729 A US 41443729A US 1944354 A US1944354 A US 1944354A
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US
United States
Prior art keywords
grain
plate
metal plate
photogravure
image
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
US414437A
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English (en)
Inventor
Ludvigsen Niels
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Individual
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Individual
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Publication date
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Application granted granted Critical
Publication of US1944354A publication Critical patent/US1944354A/en
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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
    • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
    • G03F7/115—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having supports or layers with means for obtaining a screen effect or for obtaining better contact in vacuum printing

Definitions

  • the object of the present invention is to simplify the preparation of photogravure processes as hitherto efiected.
  • the main object of the invention isto-avoid the multiple manipulations with dangerous ingredientssuch as collodion, nitrate of silver required in'photogravure processes hitherto and in consequence to reduce to a minimum expensive material and experienced personnel.
  • the present invention relates firstly to a photogravure process the feature of which is that a grain is formed on a metal 'plate by impression for example, then after the plate hasbeen sensitized, the image to be reproduced is formed thereon, the printing plate then being finished by the known means of washing, heating and etching.
  • an initial grain corresponding to the clear portions of the image is first formed on the metal plate, then the plate is coated with a coating of sensitive gelatine and on this coating a second grain is formed corresponding to the black and tion, such as gelatine or albumin treated with bichromate of ammonia. Finally, a second grain corresponding to the half tones isformed by impression on the sensitive coating.
  • the operation is exactly as if a proof is to be taken on paper, the metal plate replacing such paper.
  • the plate is etched by any suitable known method.
  • the invention extends to the above described processes whatever be the arrangements selected for carrying them into efiect. Moreover, the invention extends also, as a new product, to metal plates enabling these processes to be carried out in a particularly certain and convenient manner.
  • Fig. 1 is a diagrammatic section of a metal plate.
  • Fig. 2 is an elevation of a metal plate showing the image to be reproduced.
  • Fig. ,'3 is a diagrammatic section of a metal plate accordingto a modification of the invention.
  • the metal plate illustrated diagrammatically in section in Fig. 1 is a zinc plate 10 having an 35 initial reticulation or stippling 11 obtained by impression, for example, then a sensitive film 12R and finally a second grain 13.
  • the plate has not yet received the projectio of the image.
  • the zinc plate 10 will present clear zones 15 forming the background of the image, black zones 16 corresponding-to the superstructure of the ship and half-tone zones 1'? corresponding for example to the hull of the ship.
  • the zinc plate 10 then bears an initial grain corresponding to the clear zones of the image, such initial grain 11 being covered with a sensitive 'film' 12, on which there is a second grain 13 4 corresponding to the dark zones 16 or to the half -tone zones 17.
  • the plates to which the invention extends may obviously be very differently constituted, for example:
  • the grain 13 of the halftones 17 is weak; for-a nebulous image on the contrary the grain of the clear portions 15 is weak.
  • This predominance can be carried almost to no the point of disappearance of one of the grains, particularly in the case of the formation of printing surfaces without half-tones or without clear portions. In the etching of such plates the initial grain 11 and the second grain 13 will work under very different conditions.
  • the points of the first grain 11 imposed before the sensitizing are independent of the sensitive film 12. Although it happens thereon, they will fulfil their mission of resisting the acid during etching and later of preventing the inking rollers from penetrating into the clear parts of the image at the time of printing.
  • the second grain 13 imposed on the sensitive film 12 has, on the contrary, only a photo-chemical action. It disappears when after insulation the image is developed. The sensitive film remains there and it receives the light and will resist the attack of the acid during etching.
  • a photogravure process for relief printing .with metal plates which consists in forming an acid resisting grain on a smooth uncovered metal plate, this grain having uniform points, regularly disposed, thereafter sensitizing the plate thus prepared, then exposing washing, heating and etching the cliche in the usual way.
  • a photogravure process for relief printing with metal plates which consists in forming an acid resisting grain on a smooth uncovered metal plate, then coating the plate with a sensitive substance, forming a grain on said sensitive layer above the clear portions of the said first grain, bringing thereafter by photographic exposure upon the plate so prepared the picture to be reproduced, developing the plate and etching the plate by means of an acid.
  • the method of producing photogravure surfaces which consists in providing an acid resisting grain upon the smooth face of a metal plate, said grain consisting of uniform marks regularly disposed, thereafter coating the grained surface with a light sensitive substance, providing a grain on said sensitive surface, said second grain consisting of uniform opaque marks regularly disposed, thereafter photographically exposing, developing and etching the plate substantially as described.
  • a metal plate said metal plate having a smooth surface provided with a plurality of marks of acid resisting nature and having superimposed thereon a light sensitive layer and further, a plurality of opaque marks provided on said sensitive layer.
  • a metal plate having a smooth surface provided with an acid resisting grain of uniform dots regularly disposed, and a light sensitive layer superimposed thereon, and a second grain of uniform opaque dots regularly disposed and arranged on said sensitive layer.
  • a metal plate as claimed in claim 9 in which the dots of the second graining are disposed intermediate the dots of the first graining.
  • a photogravure printing plate having a printing surface permanently smooth and uninterrupted throughout its extent, an acid resistant grain superimposed directly on said surface and a light sensitive layer superimposed on said grain.
  • a photogravure printing plate having a printing surface permanently smooth and uninterrupted throughout its extent, printed impressions of acid resistant material superimposed directly on said surface and forming a grain thereon and a light sensitive layer superimposed on said grain.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
US414437A 1928-12-19 1929-12-16 Photogravure process and metal plate therefor Expired - Lifetime US1944354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR345255T 1928-12-19

Publications (1)

Publication Number Publication Date
US1944354A true US1944354A (en) 1934-01-23

Family

ID=31897968

Family Applications (1)

Application Number Title Priority Date Filing Date
US414437A Expired - Lifetime US1944354A (en) 1928-12-19 1929-12-16 Photogravure process and metal plate therefor

Country Status (6)

Country Link
US (1) US1944354A (pt)
BE (1) BE366334A (pt)
DE (1) DE542859C (pt)
FR (1) FR666056A (pt)
GB (1) GB345255A (pt)
NL (1) NL29715C (pt)

Also Published As

Publication number Publication date
GB345255A (pt) 1931-03-13
DE542859C (de) 1932-01-29
BE366334A (pt)
NL29715C (pt)
FR666056A (fr) 1929-09-26

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