Measurement of Basis Weight of Paper by Ionizing Radiation, 1996 International Printing & Graphic Arts Conference Proceedings
P.Kristiansson (1) , K.Malmqvist (2) , L.Malmqvist (1,3) , C.M. Nilsson (1,2,3) and W.Persson (1)
1 University of Lund
2 Halmstad University
3 Swedish Newsprint Research Centre TFL, Djursholm, Sweden
A thickness monitor based on B-absorption/scattering and fast detection techniques with a plastic scintillator are described. The precision in measurement over short time periods is discussed. A limit of 1 % is set on measurements on newsprints due to the micro structure of the paper. A technique is suggested for reduction of the uncertainty in the measurement by the use of a two threshold technique.