Quantification of paper mass distributions within local picking areas

The study introduces a new method to analyze paper structure and local print details. The method is described in detail and is based on advanced and recently developed image analysis algorithms. Simultaneous image alignment allows assessment of the local paper structure affecting a given print detail. A cross-correlation analysis between optical and beta-formation images is performed with a new developed routine. The influence of formation on picking is assessed. Based on beta-formation analysis, the present study reveals that picking occurs mostly on areas with high basis weight. It seems, however, that optical formation is not suitable for assessing the local formation characteristics affecting picking. The method seems also suitable for assessing the local characteristics of several paper and print relationships.