Eka Nobel Ab

Sunds Defibrator Ab

Eka Ab

Jan-Erik Hook

Gorgen Akerlund

Sven G Akerlund

Method for controlling peroxide bleaching in a plurality of bleaching

A method of producing peroxide bleached pulp. Lignocellulose fiber material is impregnated with an aqueous silicate solution containing a sequestering agent. The impregnated lignocellulose is preheated with saturated steam at a temperature corresponding to the defibrating temperature to precipitate silic acid on and in the fibers. The preheated fiber mass is defibrated between two grinding disc in an atmosphere of saturated steam at a temperature of 100.degree.-170.degree. C. Alkaline peroxide solution free of silicate is introduced into the grinding space.

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Lilla Edet, Sweden

Jan-Erik Hook