Abstract: A process for bleaching cellulose pulp with molecular oxygen under alkaline conditions and at an elevated temperature in a bleaching zone is disclosed in which oxygen gas is dispersed into an alkaline bleaching solution under an increased pressure, the oxygen-containing, alkaline bleaching solution is heated to at least the elevated bleaching temperature, the pressure of the hot, oxygen-containing, alkaline bleaching solution is lowered to the pressure prevailing in the bleaching zone, and the hot, oxygen-containing, alkaline bleaching solution is brought, in the bleaching zone, into contact with the cellulose pulp to bleach the latter with the oxygen gas released from the bleaching solution.

Abstract: A method and apparatus for drying pulp, wherein the pulp is pre-dried to 60 to 70%, disintegrated and then formed into a layer of fibres on a moving wire which is dried by passing hot air through it to achieve a dryness of 90%. According to a preferred embodiment of the invention the layer of fibres is cooled by air compressed by press rolls after which it is cut into sheets which are piled into bales.

Abstract: In a device for feeding fiber suspension to the web-forming part of a paper machine the tendency of the fibers in the suspension to flocculate and form fiber clusters, before being fed onto the web-forming wire, is eliminated by spraying jets of water or steam or both into the head box which is supplied with a fiber suspension of a consistency greater than the desired. The jets cause strong turbulences in the head box and thereby effectively disperse the fiber clusters.