Process for the oxidation of gilding metal sheets in aqueous screen printing

Abstract

The present invention relates to a method for oxidizing gilding metal sheets by screen printing using a colorless aqueous base combined with acids. Traditionally, the oxidation of these gilding metal sheets is carried out by hand with tools such as decorative painters' brushes, natural cloths or sponges and mixtures containing liquid acids. However, this manual work does not allow for the creation of extremely precise colored oxidation patterns and their serial reproduction. The invented method allows for the creation of extremely precise images and shades and their serial reproduction. The method consists of mixing a colorless aqueous base composed of acrylic resin and acids used for metal treatment and depositing this solution on gilding metal sheets using the screen printing technique. The metal sheets are thus oxidized.The process according to the invention is particularly intended for decorative trades, allowing them to offer a different and more precise range of oxidized patterns and shades.

Description

Title of the invention: Process for the oxidation of gilding metal sheets in aqueous screen printing

[0001] The present invention relates to a process for oxidizing metal sheets to be gilded by screen printing using a colorless aqueous base combined with acids.

[0002] The oxidation of these gilding metal sheets is traditionally carried out by hand with tools such as decorative painters' brushes, natural cloths or sponges and mixtures containing liquid acids. However, working by hand does not allow for the creation of extremely precise colored oxidation patterns and their serial reproduction. The use of the screen and the screen printing screen allows for greater precision in the deposition of material and the serial reproduction of colored oxidation patterns.

[0003] To this end, the invented method comprises the following successive steps: First step - creation of the patterns to be reproduced: a. Pre-press work on DTP (Desktop Publishing) software which aims to prepare the printing of the typons and apply different effects to obtain the precision of the desired pattern. b. Printing of the typons in black on transparent synthetic layer. c. Production of screen printing screens (typons flashing / induction photosensitive). Second step - oxidation process: a. Gluing the metal sheets onto a support. a. Preparation of a mixture of aqueous colorless ink composed of acrylic resin with acids used for metal treatments. Acrylic resin is a water-based acrylic screen printing ink for printing paper and cardboard. The selected acids are chosen from the following groups consisting of disodium sulfide, sodium selenite, copper sulfate pentahydrate, selenium dioxide, sulfuric acid. In this step, the mixture of the aqueous colorless solution and the acids are brought into contact to give rise to a solution based on acrylic resin and acids. b. Deposition of the mixed solution based on acrylic resin and acids on the metal sheets to be gilded using the screen printing technique.

[0004] The invention is intended to chemically reveal precise and serially reproducible patterns and shades by oxidation of the metal.

[0005] The method according to the invention is capable of industrial application to the extent that: - The raw material created in the form of an aqueous solution is reproducible and; - The process is used through the screen printing technique which is an industrial technique.

[0006] The veneers produced using the process are intended for various sectors of activity such as: interior architecture, design, cabinetmakers and fitters. Customers will be able to use these veneers on various decorative, functional or advertising elements (wall applications, furniture for example).

Claims

Claims

1. Process for oxidizing metal sheets to be gilded by screen printing, characterized in that it comprises a colorless aqueous solution (1) mixed with acids used for the treatment of metals, chosen from the following groups composed of disodium sulfide, sodium selenite, copper sulfate pentahydrate, selenium dioxide, sulfuric acid (2).

2. A method according to claim 1 characterized in that the colorless aqueous solution (1) is composed of acrylic resin which is a water-based acrylic ink intended for screen printing.

3. Method according to any one of the preceding claims, characterized in that the mixture of the colorless aqueous solution (1) and the acids (2) are brought into contact to give rise to a solution based on acrylic resin and acids (2).

4. Method according to claim 3 characterized in that the mixed solution based on acrylic resin and acids (3) is deposited on sheets of metal to be gilded using the screen printing technique.