Procedure for determining the diffusion coefficient prevailing i

Details Procedure for determining the diffusion coefficient prevailing i Procedure for determining the diffusion coefficient prevailing i

1997-04-28

1999-06-15

Williams, Hezron

Measuring and testing

With fluid pressure

Porosity or permeability

1621812, G01N 1508, D21H 1100

Patent

active

059132353

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.

REFERENCES:
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patent: 5127994 (1992-07-01), Johansson
patent: 5601921 (1997-02-01), Eriksson
Wochenblatt 1:1996; E.Gruber et al: Wechselwirkungen von Synthetischen Kationischen Polymeren mit Fasern und Fullstoffen, pp. 4-11.
Wochenblatt 1:1991; H.Elstner et al: Anderung der Faserstruktur Beim Receylcing . . . , pp. 5-7.
N.-E. Virkola: Puumassan Valmistus, Turku 1983, p. 685.
INSKO presentation 150-90 IV; Jan. Erik Levlin, MA: Uusiomassan Paperitekniset Ominasisuudet, p. 4.
Eero Tommila: Fysikaalinen Kemia, Helsinki 1961, p. 207, paragraphs 3 and 4.
Tappi Journal; Tom Lindstrom and Lars Wagberg, Effects of PH and Electrolyte Concentration on the Adsorption of Cationic Polyacrylamides on Cellulose, Jun. 1983, pp. 83-85.

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