Abstract: The present invention relates to a covering, in particular pit covering. The covering according to the invention has moveable elements, at least one marginal region and a movement unit. The elements extend, at least in regions, over the space to be covered and are arranged essentially parallel to one another. The elements are in each case mounted rotatably and/or pivotably in relation to the marginal region and are moveable by the movement unit. The elements are dimensioned and arranged in relation to one another in such a way that the covering has a drive-on and/or walk-on capability. The present invention relates, further, to a method for operating a covering.

Abstract: A process for preparing a bleached sulfite chemical pulp includes delignification of chips of a lignocellulosic material in a sulfite pulping process until the defibration point of the material is reached, and bleaching of the fibrous material thus obtained by a chlorine-free bleaching sequence which includes at least one first bleaching step with a chlorine-free oxidant in the presence of a base. The chemical pulp prepared according to this process and paper or nonwoven made from such pulp have a high degree of brightness (at least 83% ISO) and high strength.