Method of removing a coating of organic material adhering to the surface of tin-plated sheet steel
Assigneethyssenkrupp Rasselstein GmbH
InventorsBenjamin Liebscher, Andreas Tschage
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Abstract
A method of removing a coating made of an organic material, in particular an organic lacquer or a polymer coating, which adheres to the surface of tin-plated sheet steel. In a first step, the tin layer of the tin-plated sheet steel is completely or incipiently melted by exposure to electromagnetic radiation with a predefined wavelength, to which the organic coating is at least primarily transparent, with the organic coating becoming detached from tin layer, and in a second step, the organic material of the coating which detached from the tin layer is removed.
Claims20
A method of removing a coating of organic material adhering to a surface of tin-plated sheet steel, the method comprising:
- exposing a tin layer of the tin-plated sheet steel underlying the coating of organic material to electromagnetic radiation thereby melting the tin layer such that the coating of organic material detaches from a surface of the tin layer, the electromagnetic radiation having a wavelength in a range between 0.8 to 2.5 μm and passing through the coating of organic material without absorption to the tin layer;
- and
- removing the coating of organic material from the tin-plated sheet steel after detaching from the surface of the tin layer.
A method of removing a coating of organic material adhering to a surface of tin-plated sheet steel, the method comprising:
- exposing a first area of a tin layer of the tin-plated sheet steel underlying the coating of organic material to electromagnetic radiation of a first energy density, thereby melting the first area of the tin layer such that the coating of organic material detaches from a surface of the first area of the tin layer;
- removing the coating of organic material from the first area of the tin layer after detaching from the surface of the first area of the tin layer;
- exposing a second area of the tin layer of the tin-plated sheet steel underlying the coating of organic material to electromagnetic radiation of a second energy density different from the first energy density, thereby melting the second area of the tin layer such that the coating of organic material detaches from a surface of the second area of the tin layer;
- and
- removing the coating of organic material from the second area of the tin layer after detaching from the surface of the second area of the tin layer.
Dependencies are inferred from the claim text.