Abstract: The invention relates to an improved method for producing a printable single or multi-layered material web, characterised, inter alia, in that the following features are present: prior to printing, a primer layer is applied to the side of the material web that is provided for printing, this primer layer is applied in an excess amount to the printing side of the material web, excess primer material is stripped away by means of a doctor blade stripping element that is downstream of the material web in the removal direction or forward feed direction, for which purpose the plane of the removal doctor blade is adjustable in its alignment angle with regard to the plane of the material web and in its relative position and/or distance to the plane of the material web, and a primer material is used which has a flow time of between 10 and 30 seconds according to DIN norm 53211/4, and/or which has a solids fraction constituting between 30% and 60%.

Abstract: An improved method and an improved device for carrying out an optical comparison between at least two samples, preferably by comparing sections that can be selected, is characterized by the following characteristics: the sample (UR, LE, I) that is to be examined and is characterized by a non-uniformity in the structure and/or color is illuminated by diffused light; from the light reflected by the sample (UR, LE, I) to be examined, an interference spectrum is created by means of a spectrometer; the interference spectrum created by the spectrometer is depicted on a camera; the interference spectrum obtained in this way and/or values of the sample (I) to be examined derived therefrom are used as sample values which are compared to sample values of a reference sample (UR, LE) obtained accordingly.

Abstract: An improved method and an improved device for carrying out an optical comparison between at least two samples, preferably by comparing sections that can be selected, is characterized by the following characteristics: the sample (UR, LE, I) that is to be examined and is characterized by a non-uniformity in the structure and/or color is illuminated by diffused light; from the light reflected by the sample (UR, LE, I) to be examined, an interference spectrum is created by means of a spectrometer; the interference spectrum created by the spectrometer is depicted on a camera; the interference spectrum obtained in this way and/or values of the sample (I) to be examined derived therefrom are used as sample values which are compared to sample values of a reference sample (UR, LE) obtained accordingly.