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US1155352A - Lithographic plate for offset and direct printing. - Google Patents

Lithographic plate for offset and direct printing. Download PDF

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Publication number
US1155352A
US1155352A US1914852867A US1155352A US 1155352 A US1155352 A US 1155352A US 1914852867 A US1914852867 A US 1914852867A US 1155352 A US1155352 A US 1155352A
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Prior art keywords
plate
film
lithographic
transparency
surface
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Jacob Grass
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Jacob Grass
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004Photosensitive materials
    • G03F7/04Chromates

Description

.l. GRASS.

LITHOGRAPHIC PLATE FOR OFFSET AND DIRECT PRINTING.

APPLlCATlON FILED JULY 24. 1914.

1,15,352. "Patented 0 t.5,1915.

' WITNESSES: v l/VI/E/VTOR JACOB GRASS, OE FULHAM, LONDON, ENGLAND.

LITHOGRAPHIC PLATE FOR OFFSET AND DIRECT PRINTTNG.

Application filed July 24; 1914. Serial No. 852,867.

. is to enable the plate to ca rry more ink than hitherto, thereby imparting a deeper color to theprint obtained from the plate, either directly or through the medium of an offset surface.

In the usual method of providing ametal lithographic plate with a printing surface,

the greasy printing surface is applied to the surface of the plate by means ofa transfer, obtained in the Well-known manner, Whereafter the surface of the plate surrounding the various portions of the printing surface, is cleaned from scum by means of a liquid. This latter treatment'is called etching. al-' though not etching in the literal sense. The printing surface of an ordinary metal lithographic plate consists of a greasy substance on the surface of the plate.

Now according to the present invention, the printing surface of a metal lithographic plate is etched intaglio into the plate, whereby the printing surface, consisting of intaglio recesses, can. ta'ke up and impart more ink, than the mere surface printing surfaces hitherto provided on lithographic plates.

The intaglio printing surface is formed on the metal lithographic plate, by printing photographically through a positive transparency on a sensitized-colloid film coating the plate, and afterward etching the plate through the exposed and treated film.

The figure of the drawings is an illustration on an enlarged scale of a lithographic invention.

In said figure the numeral 1 designates a thin flat plate of metal which forms the ordinary lithographic plate, such as zinc or aluminum, having a groove or depression '2 therein, constituting an intaglio portion of the plate which is coated with varnish as j shown at 3 within said groove, said coating of varnish covering the bottom of the depression, while the ink designated by the nu- Specification of Letters Patent.

plate made in accordance with the Pate 1 m'eral 4. is filled into. the groove over the.

varnish which serves as a mat to hold a maximum quantity of the ink and which extends to the surface of the plate.

The process is as follows:'A zinc or aluminium lithographic plate is coated with a sensitive colloid film, such as fish glue sensitized with a bichromate. A positive transparency, rendered suitably opaque, is placed on the sensitized film. For producing a direct printing plate the transparency is placed face downward on the plate, for producing an ofi'set printing plate, the transparency is placed face uppermost andaway from the plate, the transparency being suitably thin. On exposure to light, the portions of the sensitized coating of the plate which are beneath the transparent portions of the transparency harden. After removal of the transparency, the plate is washed with water which dissolves away the unhardened portions of the coating of the plate, and the plate is dipped in a dye bath, for instance a bath of methyl violet dye, to render the picture or the like now on the plate visible. After being dried, the plate is immersed from 2-3 minutes invan etching bath, for instance a perchlorid of iron bath. The usual etchers precautions in having the etching liquid of the correct consistency should be'observed. After etching, the hardened glue or the like film is softened by diluted hydrochloric acid -or other means,

and the plate'is dried. The intaglio portions of the plate can then be filled in with lithographic ink, but to cause the ink to hold better in the recesses, and impart a deeper color to the print obtained from the plate a varnish which is not dissolved by water or grease, such as celluloid varnish, is first rubbed into the recesses or intaglio portions of the plate. Celluloid varnish being a mat varnish also provides a holdfast for the ink block or set-up type, by type-writing or other suitable manner and rendered sufficiently opaque by dusting over with a suitable powder. The positive transparency can for example be produced by making an impression from a printing surface upon gelatin tracing paper, or this medium has the type-written matter directly typed thereon. The transparency is then dusted over with an opaque powder, such as powdered graphite, bronze, silver or the like powder, which, owing to the powder adhering to the varnish of the impression or typed matter, renders the same opaque.

I claim 1. A method of producing a printing surface on a metal lithographic plate, consisting of coating said plate with a sensitized film, exposing said film to light through a positive transparency, washing said plate after removal of said transparency, drying said plate, etching said plate, softening said film after said etching and removing the same, drying said plate, applying varnish insoluble in water or grease to the etched recesses of said plate, and filling said recesses with lithographic ink to a plane coincident with the face of the plate, said varnish serving as a mat to hold a maximum quantity of ink, thereby imparting a deeper color to the print obtained from theplate.

2. A method of producing a printing surface on a metal lithographic plate, consisting in coating said plate with a, sensitized colloid film, exposing said film to light through a positive transparency, washing said plate after removal of said transparency, drying said plate, etching said plate, softening said film after said etching, drying said plate, applying celluloid varnish to the etched recesses of said plate and filling said varnished recesses with lithographic ink and, removing the film.

3. A method of producing a printing surface on a metal lithographic plate, consisting in coating said plate with a sensitized film, exposing said film to light through a transparency, washing said plate after removal of the transparency, drying said plate, etching said plate, softening said film after said etching, drying said plate, applying celluloid varnish to the etched recesses of said plate, filling said varnished recesses with said lithographic ink, removing said film by washing around the recesses and gummingsaid plate to prevent oxidation.

4. The process of producing an intaglio printing surface-on a metal lithographic plate, consisting in coating the same with a sensitivecolloid film in the form of a glue, placing a 'positive transparency on the sensitized film rendered suitably opaque, hardening the portions of the sensitized coating of the plate which are located beneath the transparent portions of the transparency, dissolving away the unhardened portions of the coating of the plate by washing with water, dipping the plate in a dye bath to render the picture or the like thereon visible, drying the plate, immersing the same in an etching bath, softening the hardened glue like film and removing the same, then drying the plate and filling the intaglio portions of the plate with lithographic ink.

5. The process of producing an intaglio printing surface on a metal lithographic plate, consisting in coating the same with a sensitive colloid film in the form of a glue, placing a positive transparency on the sensi-' tized film rendered suitably opaque, hardening the portions of the sensitized coating of the plate which are located beneath the transparent portions of the transparency, dissolving away theunhardened portions of the coating of the plate by washing with water, dipping the plate in a dye bath to render the picture or the like thereon visible, drying the plate, immersing the same in an etching bath, softening the hardened glue like film, removing said film, then drying the plate and working celluloid varnish into the intaglio portions of the plate and then filling said intaglio portions with lithographic ink over the said varnish, whereby the latter being a mat varnish, will cause the ink to enter the pores thereof to produce a deeper color than is otherwise obtainable.

In testimony whereof I afiix my signature in presence of two witnesses.

Rom. A. BLAKE, F. W. LANE.

US1155352A 1914-07-24 1914-07-24 Lithographic plate for offset and direct printing. Expired - Lifetime US1155352A (en)

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US1155352A US1155352A (en) 1914-07-24 1914-07-24 Lithographic plate for offset and direct printing.

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US1155352A US1155352A (en) 1914-07-24 1914-07-24 Lithographic plate for offset and direct printing.

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036130A (en) * 1974-07-30 1977-07-19 De La Rue Giori S.A. Intaglio printing plate manufacture
US4043815A (en) * 1972-06-28 1977-08-23 Stephane Klymus Method of making printing plates for offset printing
US4387114A (en) * 1980-11-20 1983-06-07 Verbatim Corporation Spindle aperture reinforcement for a floppy disk

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043815A (en) * 1972-06-28 1977-08-23 Stephane Klymus Method of making printing plates for offset printing
US4036130A (en) * 1974-07-30 1977-07-19 De La Rue Giori S.A. Intaglio printing plate manufacture
US4387114A (en) * 1980-11-20 1983-06-07 Verbatim Corporation Spindle aperture reinforcement for a floppy disk

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