NONLINEAR BEHAVIOUR OF ONE-SIDE COATED PAPER: STATIC AND DYNAMIC VISCOELASTIC PROPERTIES

The research presented in this paper is the result of a study on the dynamic and static viscoelastic properties of one-side coated papers for the purpose of offset printing. During their formation and the technological processes of coating and printing, paper substrates are exposed to various traction forces, which cause not only nonlinear time dependence, but also a permanent irreversible deformation. Paper, which is basically a composite material, also demonstrates viscoelastic properties. Viscoelastic materials characteristically adjust and respond to external forces, i.e. stresses and strains, in the form of a continuous rearrangement of molecular, supramolecular and other hierarchical morphological structures.