4. Summary
4.1 Pulp samples are screened using a laboratory screening device. The rejects from the screen are transferred to a black filter paper. A coated paper is placed on top of the filter paper, and together they are heated and pressed under controlled conditions. Once the coated paper is removed from the filter paper, the coating will be picked up by the stickies and create a contrast on the black filter paper, which readily allows the measurement of area and number of the heat-set stickies with an image analyzer