Development of evaluation techniques of dispersibility of high-consistency pulp-suspension and fiber behavior in dispersion ducts

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An optical measuring method for evaluating the fiber concentration was developed for flowing pulp liquid. This method was applied to a fully developed steady flow in ducts with a square cross section. It is found that the flow mechanism of pulp-suspension in ducts can be classified into five patterns. Moreover, the relationship between the degree of uniformity of the fiber concentration and the flow rate was made clear. In addition, visualization and fiber-concentration measurements of wakes from the partition plates inserted in ducts were executed and useful basic data for the optimization of headbox of the papermaking machine were presented.