US1628857A - Process for reetching half tones on copper together with alpha formula applicable thereto - Google Patents
Process for reetching half tones on copper together with alpha formula applicable thereto Download PDFInfo
- Publication number
- US1628857A US1628857A US744496A US74449624A US1628857A US 1628857 A US1628857 A US 1628857A US 744496 A US744496 A US 744496A US 74449624 A US74449624 A US 74449624A US 1628857 A US1628857 A US 1628857A
- Authority
- US
- United States
- Prior art keywords
- reetching
- half tones
- copper together
- formula applicable
- applicable
- 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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/025—Engraving; Heads therefor characterised by means for the liquid etching of substrates for the manufacturing of relief or intaglio printing forms, already provided with resist pattern
Description
Patented May 17, 1927.
UNITED STATES PATENT oFFicE.
VICTOR C. RUNNING, OF CHICAGO, ILLINOIS, ASSIGNOR TO J'AHN & OLLIER ENGRAV- ING 00., OF CHICAGO, ILLINOIS, A' CORPORATION OF ILLINOIS.
PROCESS FOR BEETCHING HALF TONE-S ON COPPER TOGETHER WITH A FORMULA I APPLICABLE THERETO.
Ho Drawing.
This invention relates to a process for reducing the high light dots on half tones, an operation which hasheretofore required the application of ink, asphaltum, or waxto the plate to prevent the acid from etch ng or reducing the shadows. According to my process of re-etching half tones, the high lights are reduced with the aid of a solution which preferably consists of alcohol (denatured), 1 gallon of white shellac, 1 ounces (360 grains) of bulk rosin, 4 grains of borax powder, 3 ounces of bull: gum camphor, and i grains of aniline dye (coal tar). The above ingredients in about the proportions named will produce most satisfactory results.
In carrying out the process of my invention, chalk or magnesia is applied to the half toneplate after obtaining the printing depth thereon. The solution above described is then flowed on to the plate to harden or petrify the magnesia so that. it becomes acid-proof. The high lights may then be readily brushed clean by the use of a felt or brush, but without disturbing the petrified acid-proof magnesia which'remains in the darks of the half tone. In this condition the plate is then subjected to an acid treatment for re-etching. Following'this it is cleaned in a bath containing about part of muriatic acid.
By employing the above described process wherein use is made of a re-etching top solution having the ingredients named, I do away with painting and staging the darlcs with ink or asphaltum. This results in a Application filed October 18,1924. Serial no ma ise.
very material saving both in time and labor. The solution which I have mentioned is very effective in carrying out this process. It will be found that the camphor and other ingredients have the effect of hardening the magnesia so as to render it resistant to acid. The alcohol acts as a solvent for the rosin, borax powder, and aniline dye, and the presence of the shellac causes the rosin to harden with the result that a thin coat or film forms over the magnesia. By adding borax powder to the solution, it is possible to wash off the plate in, a bath containing a very smallquantity of muriatic acid. The dye imparts a deeper color to the darks on the plate, thereby enhancing the contrasts in light so as to facilitate the labor of reetching.
According to the process which I have described, it is possible to save as much as two or three hours daily in the production of a plate which is a fac-simile reproduction of the copy. The plate itself is etched deeper, thereby possessing greater printing life.
I claim: I
1. A solution applicable to the re-etching of copper half tones consisting of alcohol, shellac,'rosin, borax powder, camphor, and aniline dye, substantially as described.
2. A solution applicable to the re-etching of copper half tones consisting of alcohol,
1 gallon of white shellac, 360 grains of bulk rosin, 4t grains of borax powder, 3v ounces of bulk gum camphor, and t grainsof aniline dye, substantially as described. VICTOR C. RUNNING.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US744496A US1628857A (en) | 1924-10-18 | 1924-10-18 | Process for reetching half tones on copper together with alpha formula applicable thereto |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US744496A US1628857A (en) | 1924-10-18 | 1924-10-18 | Process for reetching half tones on copper together with alpha formula applicable thereto |
Publications (1)
Publication Number | Publication Date |
---|---|
US1628857A true US1628857A (en) | 1927-05-17 |
Family
ID=24992917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US744496A Expired - Lifetime US1628857A (en) | 1924-10-18 | 1924-10-18 | Process for reetching half tones on copper together with alpha formula applicable thereto |
Country Status (1)
Country | Link |
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US (1) | US1628857A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2564659A (en) * | 1948-11-06 | 1951-08-21 | Electrographic Corp | Re-etching electrotypes |
US2592546A (en) * | 1945-07-16 | 1952-04-15 | Dirkman Agnes Marie | Photoengraving |
-
1924
- 1924-10-18 US US744496A patent/US1628857A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2592546A (en) * | 1945-07-16 | 1952-04-15 | Dirkman Agnes Marie | Photoengraving |
US2564659A (en) * | 1948-11-06 | 1951-08-21 | Electrographic Corp | Re-etching electrotypes |
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