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Billerud

Elucidating the mechanisms affecting diffusion of retention aid in flocculated fibre suspensions

The project is about the development of new knowledge regarding the transport of chemical retention aids and fines in flocculated pulp suspensions. Specifically, we have developed a method to study the diffusion of polyelectrolytes in model fiber flocs and to quantify the transport on the micrometre to millimetre scale.

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Improved uniformity of the fibers liberated in the kraft pulp digester 

This project sets out to elucidate mass transport characteristics during delignification of wood chips as a means of understanding and controlling non-uniform delignification effects, associated to low efficiency and poor property control in the current pulping processes. To obtain information on local variations of delignification effect in a wood chip, the treated chips will be

Improved uniformity of the fibers liberated in the kraft pulp digester  Läs mer »