Self-similar roughening of drying wet paper

We studied the kinetic roughening dynamics of drying wet paper. The configurations of dry paper sheets are found to be self-similar, rater than self-affine. Accordingly, the paper roughening dynamics corresponds to the new class of anomalous kinetic roughening [J. J. Ramasco, J. M. Lopez, and M. A. Rodriguez, Phys. Rev. Lett. 84, 2199 (2000)], characterized by the equal local and global roughness exponents zeta=alpha=1 and the dynamic exponent z=1.0 +/- 0.2, whereas the spectral roughness exponent alpha(S)> 1 is determined by the long-range correlations characterized by the fractal dimension D of crumpled sheet.