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Analysis of laboratory beating by fiber settling time frequency distributions.

Application: Statistical analysis of fiber settling is a new approach for measuring the degree of refining.

In samples of hardwood kraft pulp beaten in the laboratory to different extents, fiber populations were studied with respect to how the fibers settle in a cylinder of water. Results showed that the mean fiber settling times increased from 34.4 s for a beating time of 5 min to 69.9 s for a beating time of 50 min. A similar increase was observed in the standard deviations in frequency distributions of fiber settling times-from 11.3 s for 5 min of beating to 33.7 s for 50 min of beating. On average, with the increase in beating time, the fibers settled more slowly, and the spread of settling velocities was greater. Regression correlations were developed to elucidate the relationships between beating time and mean fiber settling time and between beating time and the standard deviation of frequency distribution. There was a good fit for the experimental data.

H. R. Ghatak is with the Chemical Technology Dept at S.L.I.E.T., Longowal-148 106, Punjab, India. Email Ghatak at
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Title Annotation:Testing
Author:Ghatak, Himadri Roy
Publication:Solutions - for People, Processes and Paper
Date:Nov 1, 2003
Previous Article:From the November 2003 TAPPI JOURNAL.
Next Article:Fiber surface saturation as a strategy to optimize dual-polymer dry strength treatment.

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