METHOD AND MEASURING ARRANGEMENT FOR MEASURING PAPER SURFACE

摘要

The invention relates to a method and a measuring arrangement for determinin g gloss of paper or paperboard. The paper or paperboard (11) surface is illuminated with collimated light substantially parallel with the normal of the paper or paperboard (11) surface. An image is produced from the paper or paperboard (11) surface by means of reflected optical radiation. The reflect ed optical radiation is used for producing an image of the paper or paperboard surface onto the pixels of the camera's (22) detector surface, each of the pixels imaging an area in the order of micrometers of the paper or paperboar d surface. An aperture (20, 30) provided in front of the camera (22) is used f or adjusting the incidence angles of the reflected radiation, which affects the measurement of gloss. Gloss of paper or paperboard is measured on the basis of the intensity of the pixels on the camera's (22) detector surface.