US1215494A

US1215494A - Printing-plate.

Info

Publication number: US1215494A
Application number: US10787216A
Authority: US
Inventors: George R Cornwall
Original assignee: JAMES G COFFIN
Current assignee: JAMES G COFFIN
Priority date: 1916-07-06
Filing date: 1916-07-06
Publication date: 1917-02-13
Anticipated expiration: 1934-02-13

Description

G R. CORNWALL.

PRlNTiNG PLATE. APFUCATION FILED MAR 20. 1905- RENEWED JULY 6,1916.

Patented Feb. 13, 1917.

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plates known as planographic.

GEORGE R. CORNWALL, OF RYE, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, T JAMES G. COFFIN, TRUSTEE.

PRINTING-PLATE.

Patented Feb. 13, 1917..

Application filed March 20, 1905, Serial No. 251,096. Renewedluly 6, 1916. Serial No. 107,872.

To all 1071 cm it may concern:

lie it known that I, Gnome R. CORNWALL, a citizen of the United States, residing at Rye, in the county of ll cstchestcr and State of lleu i'orlr, have invented new and useful lmproven'ieuts in Printing-Plates, of which the following is a specification.

The invention relates to printing plates and, more particularly, to that class of An object of ti iuycntion is to produce a. printing plate which shall be of great durability; which is capable of yielding work of high .quality and at great speed; and which is easily and inexpensively made. These and other objects will more fully appear from the following description.

The invention consists in the novel articles, parts, improvements and combinations herein shown and described.

The accompanying drawings, referred to herein and forming av part hereof, illustrate in part a printing plate which is one embodiment of the invention, the same servingin connection with the description herein to explain the principles of the invention. It will be understood that the drawings are diagrammatic in character and do not neces sarily actually represent a printing plate nor the relative proportions of the parts thereof, this form of illustration being best suited to elucidate an invention of this character.

()f the drawings:

Figure 1 shows a plate carrying a design;

Fig. 2 is a section on the line lib-H of Fig. 1;

Fig. 3 a similar section showing a somewhat ditl'crent structure of the plate;

Fig. l a similar section showing a different structure of the plate; and Fig. 5 is a section showing another structure of the plate.

In the illustration of a printing plate herewith, illustrating an embodiment of the invention, 1 represents the non-printing portion of the surface of such a plate, said portion being of a planographic character, 2'. 2., being adapted to reject inl; either from the nature of the surface, or from its adapt ability to hold an ink-rejecting substance. The design portion of the surface of the plate is represented by the reference numeral 2, and is of such a nature as to take ink readily.

The plate may be made from a variety of materials, and among available materials certain metals are particularly adaptable for such a plate, among these metals being zinc and aluminum. The surface of the plate is caused to reject ink in the non-printing pormay be caused to display opposite planographic properties by subjec mg such material to different treatments adapted to cause the material to change its state or condition, one treatment placing it in a state or condition fitting it to act as the nonpr1nting part of the plate surface, and

other treatment putting i t'in state'or conditlon fitting lt ;t0 act as the printing part thereof;

In Fig. 2 of'the drawings one form -"of 5 plate is shown, wherein the design-constituting part of the surface is indicated by 2 and the non-printing part by 1. This plate may be made by preparing'in any suitable manner the surface of a plate of zinc, aluminum, or other suitable material, so that it may act as the ink-rejecting portion of the plate, as by giving it an open, non-compacted structure, which may be effected by graining, sand-blasting, or by other suitable treatment. The entire surface, excepting the design portion, may then be covered with a proper resist and there may then be deposited in the space of the design, either electrolytically or otherwise, some of the same metal or material, and this deposit may be of such thickness as is desired for the particular work to be done by the plate. This deposit will then be in the form of the design, and the entire deposit, or only the surface thereof, by suitable treatment, will be brought into a state or condition so as to take ink. This may be done by giving the deposit, or its surface only, a dense or compacted structure, which may be effected by polishing, or by indurating it, as by rolling, compressing, etc., or by otherwise treating it so as to cause it to act in the manner desired.

In Fig. 3 a form'of the plate is shown wherein the surface of a metal plateletsheet-- receives protection on that part of its surface which is to constitute the dcs'rgnand the r mainder of the surface is then placed in a condition to act as the ink-rejecting portion of the plate. This may be done in any suitable manner, as by etching it, or by graining.

Where the surface has been etched down, there'may be deposited thereon an open or non-compacted layer of the material, elechaving its surface, or a portion thereof, in.

condition to act as the ink-taking portion of the plate, suitably protected and then having deposited thereabout, by electrolysis or otherwise, a layer or deposit of the metal, which, either by the manner of its deposition or by subsequent treatment may be put in condition to reject ink.

Fig. 5 shows an embodiment of a plat similar to that in Fig. 3 with the exception that the surface has not been subjected to any etching process. The non-printing portion 1 of the surface is grained, or rendered ink-rejecting in any other suitable manner, and the portion 2 is given a high polish, or is indurated, or otherwise rendered inktaking by any suitable treatment. This manner of producing the plate is well adapted to metals, such as zinc and aluminum, and also to glass. The entire surface of the plate may first be polished and the design protected while the remainder of the surfaceis grained in any suitable manner, as by a sand-blast, or the design portion of the surface may be polished or hardened after the non-printing portion has been first prepared.

From all the foregoing it will be seen that aprinting plate has been provided consisting of a single material which has a portion of its surface adapted to act as the printing, and another portion the non-printing, parts of a planographic printing plate; that such plate may be entirely of a slngle material, which may be a metal. and which may possess a very slight relief or intaglio, or be in a single plane, which has superior printing action and practically unlimited durability, and practice has shown that such plates produce work of very superior quality.

The invention, in its broader aspects, is n t limited to the particular embodiment shown, nor to any particular embodiment, nor to the particular materials nor to any particular materials, as changes may be made without departing from the main principles of the invention and without sacrificing its chief advantages.

What I do claim as my invention, and desire to secure by Letters Patent, is:

l. A metal planographic printing plate having the metal of the printing face in a dense or compacted condition in the design parts and in an open or non-compacted but coherent and unamalgamated condition in the non-design parts.

2. A planographie printing plate having its printing surface of a single metal, a por-. tion of said surface being in a dense or compacted state or condition and the remainder of the surface of said plate being in an open or non-compacted state or condition, said portions being arranged or disposed with reference to each other so as to define the design; said portions constituting the inktaking and ink-rejecting parts of the surface, respectively.

3. A planographic printing plate having its printing surface consisting of a single metal, a portion of said surface being in an indu-rated state or condition and the remainder of said surface being in a nonindurated state or condition, said portions 'being arranged or disposed with reference to each other so as to define the design; said portions constituting the ink-taking and ink-rejecting parts of the surface, respectively.

4. A planographic printing plate having its printing surface consisting of a single material, a portion of said surface being polished and a portion thereof grained, said portions being arranged or disposed S0 as to define the design; said portions constituting the ink-taking and ink-rejecting parts of the surface, respectively.

5. A planographic printing plate having its printing surface consisting of a single metal, a portion of said surface being polished and a portion thereof grained, said portions being arranged and disposed so as to define the design; said portions constituting the ink-ta king and ink-rejecting parts of the surface, respectively.

6. A planographic printingplate having 116 a printing surface consisting of a single planographic metal, the design bearing portion of said plate being smooth and the design being carried directly upon such smooth portion and arranged in the plane of the other portions of the surface, the non-design portions of said surface being grained to be water-taking and Water-holding.

In testimony whereof I have signed my nanie to this specification 1n the presence of 120 two subscribing witnesses.

GEORGE R. CORNWALL.

Witnesses WM. TIIRAP PONAL, JOHN D. MORGAN.