Method of producing peroxide bleached pulp

Details Method of producing peroxide bleached pulp Method of producing peroxide bleached pulp

D - Textiles, Paper

21

C

9/34, 8/82

D21C 9/16 (2006.01) D21B 1/16 (2006.01) D21D 1/30 (2006.01)

Patent

CA 1112816

METHOD OF PRODUCING PEROXIDE BLEACHED PULP ABSTRACT OF THE DISCLOSURE Method of producing peroxide bleached pulp from fibrous lignocellulose materials which are subjected to a defibration step in a grinding space defined between a pair of discs which rotate relative to one another within a steam pressurized grinding hous- ing. The pulp material is fed into the central portion or "eye" of the grinding space by a screw conveyor which rotates in a bore communicating with the grinding housing to form a steam- tight plug to prevent blowback of pressurized steam from the grinding housing. The steam-tight plug, upon entry into the cen- tral portion of the grinding space, is broken up into fiber bundles which are accelerated radially outwards in the grinding space by the centrifugal force while being subjected to pro- gressively increasing defibrating action. A peroxide-containing bleaching solution is introduced into the grinding space so as to react with the separated fibers of the pulp material during the defibrating action.

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