A method of producing etched plates for graphic printing and...

C - Chemistry – Metallurgy – 25 – F

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C25F 3/02 (2006.01) B23H 9/06 (2006.01) C25F 7/00 (2006.01)

Patent

CA 2095227

There is provided an apparatus and a process for using same for etching a metallic object (22), suitably a plate to prepare a metallic printing plate. The object is partially covered by a resist surface (14) wherein the exposed portions (16) of said metal, will be exposed to the action of an electrolytic etchant force. The apparatus comprises a bath (10) for an aqueous electrolyte (12), an electrode (23), suitably but not critically metallic, immersible in said electrolyte, which will serve as the cathode, a source of direct current voltage (32), which may further be associated with adjustment means (38) for controlling the applied voltage. The voltage should be adjustable to operate accurately within a rather narrow voltage range, such than the minimum voltage shall be at least that of the ionization potential of the metal of the metal object in the electrolyte chosen and the maximum shall not substantially exceed the sum of the decomposition voltage of the aqueous electrolyte and the over-voltage of the cathode selected.

Procédé et appareil de gravure d'un objet métallique (22) en particulier une plaque, pour préparer une plaque d'impression métallique. L'objet est partiellement recouvert d'une surface de réserve (14) où les parties exposées (16) dudit métal sont exposées à l'action d'une force de gravure électrolytique. L'appareil comprend un bain (10) pour un électrolyte aqueux (12), une électrode (23) de préférence mais non obligatoirement non métallique immersible dans ledit électrolyte et servant de cathode, une source de tension à courant continu (32) pouvant être associée à des moyens de réglage (38) pour commander la tension appliquée. La tension devrait être réglable pour fonctionner de manière précise à l'intérieur d'une plage de tension plutôt étroite, de sorte que la tension minimum soit au moins celle du potentiel de ionisation du métal de l'objet métallique dans l'électrolyte choisi et que la tension maximum ne dépasse pas la somme de la tension de décomposition de l'électrolyte aqueux et de la surtension de la cathode choisie.

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