Process for embossing microgrooves in light-reflecting sheet metal

Abstract

The invention relates to a process for embossing groove-shaped microstructures into thin-walled sheet metal between two hard rollers for the production of louvre blinds with at least partially metallic reflective and at least partially grooved upper surfaces for light deflection. The following process steps apply: Arrangement of a thin, soft, elastic and/or plastic layer of plastic beyond the embossed sides Creating a groove by embossing V-shaped grooves which run in the longitudinal direction of the slit strip to be embossed, wherein the grooving is embossed in throughfeed between one or more pairs of rollers, wherein a pair of rollers consists of a hard embossing roller with a groove-shaped contour and a hard counterpressure roller without grooves, wherein the counterpressure roller is hard in relation to the soft embossing base formed by the thin, soft, elastic and/or plastic layer of plastic material wherein the embossing is carried out in the thin sheet metal strip by embossing through the thin sheet metal into the soft plastic layer and wherein the counter-pressure roller has a smooth, elastic, but harder or hard surface in relation to the embossing base, so that the thin, soft, elastic and/or plastic layer of plastic is crushed more strongly in the area of the groove edges and the squeezed, soft, elastic and/or plastic plastic layer is squeezed into the groove valleys between the groove edges, so that the squeezing of the soft, elastic and/or plastic layer of plastic material at the groove edges causes the thin sheet to support a positive moulding in the groove valleys of the embossing roller as a result of by squeezing the soft, elastic and/or plastic plastic layer at the grooved edges, the thin sheet supports a form-fitting moulding in the groove valleys of the embossing roller due to displacement and thus a thin sheet grooved on both sides can be produced by means of a smooth counter-pressure roller without grooves.

Dependencies are inferred from the claim text.