DE138163C - - Google Patents
Info
- Publication number
- DE138163C DE138163C DENDAT138163D DE138163DA DE138163C DE 138163 C DE138163 C DE 138163C DE NDAT138163 D DENDAT138163 D DE NDAT138163D DE 138163D A DE138163D A DE 138163DA DE 138163 C DE138163 C DE 138163C
- Authority
- DE
- Germany
- Prior art keywords
- ink
- cover base
- way
- iron
- etching
- 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.)
- Active
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- KRVSOGSZCMJSLX-UHFFFAOYSA-L Chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- NNFCIKHAZHQZJG-UHFFFAOYSA-N Potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 239000001293 FEMA 3089 Substances 0.000 description 1
- 231100000614 Poison Toxicity 0.000 description 1
- 230000002378 acidificating Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- B41C1/003—Forme preparation the relief or intaglio pattern being obtained by imagewise deposition of a liquid, e.g. by an ink jet
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electroplating Methods And Accessories (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
- Λ! 138163 KLASSE 156.- Λ! 138163 CLASS 156.
Die vorliegende Erfindung hat ein Verfahren zur Herstellung von Aetzungen auf Druckwalzen
oder Druckplatten zum Gegenstande, bei welchem nach dem Auftragen der Zeichnung
mittels autographischer oder anderer Tinte die Walze bei den freigebliebenen Stellen
mit einer metallischen Deckschicht versehen und alsdann nach dem Ablösen der Tinte die
Zeichnung durch ein Aetzmittel eingeätzt wird. Damit die Deckschicht bei der späteren Aetzung
von dem Aeizmittel nicht angegriffen wird, hat man bisher dieselbe aus Edelmetallen, beispielsweise
aus Gold hergestellt. Hierbei aber ergiebt sich aufser dem hohem Herstellungspreis
dieser Schichten der Uebelstand, dafs die dazu verwendeten Bäder stark cyankaliumhaltig
sind und entweder theils schon selbst etwas alkalisch reagiren oder bei der Elektrolyse alkalische
Reactionen zeigen. Durch das freigewordene Alkali wird aber die fette Tinte angegriffen
und zerstört, so dafs es nicht möglich ist, auf diese Weise scharfe Zeichnungen zu erhalten.
Aufserdem macht sich noch die Giftigkeit solcher Bäder als Uebelstand bemerkbar.
Zur Umgehung dieser Schwierigkeit sollen nach vorliegender Erfindung Ueberzüge von
Eisen verwendet werden, das eine sehr dauerhafte Deckschicht erzeugt und auch aus sauer
reagirenden Elektrolyten niedergeschlagen werden kann. Auch wird beim Eisen die Anwendung
von giftigen Lösungsmitteln wie Cyankalium umgangen.
r Die Ausführung des Verfahrens geschieht derart, dafs man zunächst die Zeichnung in
der üblichen Weise mittels einer fetten Tinte auf die Walze überträgt und alsdann den
Ueberzug auf galvanoplastischem Wege durch Eintauchen in eine Lösung eines Eisensalzes
und Elektrolyse der Lösung hervorbringt. Der auf diese Weise erhaltene Metallüberzug bildet
eine zusammenhängende Schutzschicht, die aufserordentlich beständig ist. Nach dem Abwaschen
mit Benzin oder Terpentinöl wird das auf den Linien der Zeichnung exponirte Metall der aus Kupfer, Zink oder einem anderen
geeigneten Metall bestehenden Walze durch verschiedene Chemikalien angeätzt. Die Art
der angewendeten Aetzmittel richtet sich natürlich nach dem für die Walze verwendeten
Metall. Unter Anderem hat sich Chromsäure als zweckmäfsiges Aetzmittel erwiesen, das sowohl
für Zink- als für Kupferwalzen benutzt werden kann und die aus Eisen bestehende
Deckschicht nicht angreift. ' -The subject of the present invention is a process for producing etchings on printing rollers or printing plates, in which, after the drawing has been applied by means of autographic or other ink, the roller is provided with a metallic cover layer at the areas that have remained free and then the drawing is carried out after the ink has been removed an etchant is etched in. So that the cover layer is not attacked by the etching agent during later etching, it has hitherto been made of noble metals, for example gold. In addition to the high production price of these layers, there is the disadvantage that the baths used for this purpose contain a lot of cyanopotassium and either react somewhat alkaline themselves or show alkaline reactions during electrolysis. By the alkali that is released, however, the fat ink is attacked and destroyed, so that it is not possible to obtain sharp drawings in this way. In addition, the toxicity of such baths is noticeable as an evil. To circumvent this difficulty, according to the present invention, coatings of iron are to be used, which produces a very permanent cover layer and can also be deposited from acidic electrolytes. In the case of iron, the use of poisonous solvents such as potassium cyanide is bypassed.
r The execution of the method is done in such a way to DAF first the drawing in the usual manner transferred to the roll by means of a fat ink and then the coating on galvanoplastic manner by immersion in a solution of an iron salt and electrolysis of the solution produces. The metal coating obtained in this way forms a cohesive protective layer that is extremely durable. After washing with gasoline or turpentine oil, the metal exposed on the lines of the drawing is etched by various chemicals on the roller, which is made of copper, zinc, or some other suitable metal. The type of etchant used depends of course on the metal used for the roller. Among other things, chromic acid has proven to be a useful caustic agent that can be used for both zinc and copper rollers and does not attack the iron top layer. '-
Claims (1)
Verfahren zur Herstellung von Aetzungen auf Druckwalzen oder Druckplatten durch Aufbringen einer Zeichnung in elektrisch nicht leitendem Stoff wie z. B. autographischer Tinte, elektrolytisches Niederschlagen eines metallischen Deckgrundes auf den von der Zeichnung "freien Stellen, Entfernen der Zeichnung und Einätzen der so freigelegten Stellen, gekennzeichnet durch die Verwendung eines Deckgrundes aus metallisch niedergeschlagenem Eisen.Patent claim:
Process for the production of etchings on printing rollers or printing plates by applying a drawing in an electrically non-conductive material such as, for. B. autographic ink, electrolytic deposition of a metallic cover base on the "free areas" of the drawing, removal of the drawing and etching of the areas exposed in this way, characterized by the use of a cover base made of metallically precipitated iron.
Publications (1)
Publication Number | Publication Date |
---|---|
DE138163C true DE138163C (en) |
Family
ID=405995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT138163D Active DE138163C (en) |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE138163C (en) |
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0
- DE DENDAT138163D patent/DE138163C/de active Active
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