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Proceedings Paper

Application of high-speed photography to chip refining
Author(s): Mustafa I. Stationwala; Charles E. Miller; Douglas Atack; A. Karnis
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Paper Abstract

Several high speed photographic methods have been employed to elucidate the mechanistic aspects of producing mechanical pulp in a disc refiner. Material flow patterns of pulp in a refmer were previously recorded by means of a HYCAM camera and continuous lighting system which provided cine pictures at up to 10,000 pps. In the present work an IMACON camera was used to obtain several series of high resolution, high speed photographs, each photograph containing an eight-frame sequence obtained at a framing rate of 100,000 pps. These high-resolution photographs made it possible to identify the nature of the fibrous material trapped on the bars of the stationary disc. Tangential movement of fibre floes, during the passage of bars on the rotating disc over bars on the stationary disc, was also observed on the stator bars. In addition, using a cinestroboscopic technique a large number of high resolution pictures were taken at three different positions of the rotating disc relative to the stationary disc. These pictures were computer analyzed, statistically, to determine the fractional coverage of the bars of the stationary disc with pulp. Information obtained from these studies provides new insights into the mechanism of the refining process.

Paper Details

Date Published: 1 April 1991
PDF: 9 pages
Proc. SPIE 1358, 19th Intl Congress on High-Speed Photography and Photonics, (1 April 1991); doi: 10.1117/12.24078
Show Author Affiliations
Mustafa I. Stationwala, Pulp and Paper Research Institute of Canada (Canada)
Charles E. Miller, Massachusetts Institute of Technology (United States)
Douglas Atack, Pulp and Paper Research Institute of Canada (Canada)
A. Karnis, Pulp and Paper Research Institute of Canada (Canada)


Published in SPIE Proceedings Vol. 1358:
19th Intl Congress on High-Speed Photography and Photonics
Peter W. W. Fuller, Editor(s)

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