Procedure for determining the diffusion coefficient prevailing in the fibre wall in a suspension containing primary and secondary fibre

Petri Silenius (Inventor), Matti Lindström (Inventor), Philip Luner (Inventor)

Research output: Patent

Abstract

The invention relates to a procedure for determining a quantity dependent on the rate of diffusion in the fibre wall for diffusion occurring through it, in which procedure a diffusible tracer is introduced into the fibres under measurement, the fibres are suspended in an aqueous phase and the tracer concentration is determined after a certain time has elapsed since the time of suspension of the fibres, and the quantity dependent on the rate of diffusion is calculated on the basis of the concentration and time. <??>In addition, the invention relates to a procedure for determining the proportion of secondary fibre in a fibre suspension containing primary fibre and secondary fibre, in which procedure virtual diffusion coefficients are determined in the fibre wall for diffusion taking place through it in at least two fibre suspensions for which the proportions of primary and secondary fibre are known and in a fibre suspension under measurement, and that the proportion of secondary fibre in the suspension under measurement is estimated by assuming that the diffusion coefficient depends mainly linearly on the proportion of primary and secondary fibre in the fibre suspension.
Original languageEnglish
Patent numberEP1353163
IPCG01N 33/ 34 A I
Priority date22/04/1997
Publication statusPublished - 15 Oct 2003
MoE publication typeH1 Granted patent

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