DENSITY CORRELATIONS IN PAPER

We present an analysis of areal mass density correlations in, paper. U sing beta radiography, the local mass density of laboratory. paper she ers has been measured. The real space density autocorrelation function calculated from the data reveals a nontrivial power law type of corre lations with the decay exponent being roughly independent of the basis weight of the: sheets. However, for low densities we iind that correl ations may extend at least an order of magnitude-beyond the fiber leng th, whereas for heavier paper they quickly die out.