  We have experimentally investigated the fracture process in paper samples
submitted to a uniaxial force. Five types of paper sheets (newsprint, towel,
sulfite, silk and couche papers) were fractured along two orthogonal
orientations. In order to characterize the rupture lines of the paper sheets we
utilized the Hurst exponent. Our results indicate a dependence of the Hurst
exponent on the orientation of the paper sheets for samples of newsprint and,
probably, towel and silk papers. For the other types of paper the Hurst
exponent does not depend on the direction of crack propagation.
