FIBROUS SUBSTANCE-CONTAINING MATERIAL BASED ON CELLULOSE
The invention relates to a base material as the starting material for producing a flat, fibrous substance-containing object like paper or cardboard, comprising a natural or synthetic fibrous material like cellulose. The fibers of the fibrous material have an average diameter of preferably less than 20 µm; the fibers of the fibrous material have a preferable fiber length of 200 to 2000 µm; the fibers are ground ultra-high so that the freeness is above the Schopper-Riegler measurability.