On-line monitoring of fibre length of mechanical pulps

Details On-line monitoring of fibre length of mechanical pulps On-line monitoring of fibre length of mechanical pulps

G - Physics

01

N

73/81, 73/98

G01N 15/02 (2006.01) G01N 33/34 (2006.01)

Patent

CA 1138224

ON-LINE MONITORING OF FIBRE LENGTH OF MECHANICAL PULPS ABSTRACT FOR DISCLOSURE A method and an apparatus for determining the fibre length distribution by weight of a pulp and a method and apparatus for determining absolute consistency are disclosed. The fibre length distribution is obtained by dividing the flow of a pulp sample into two separate flows, fractionating each of the flows by a screen into a retained and a through fraction, the screens being of different mesh sizes, measuring the amounts of each of a selected one of said retained or through fractions and determining, based on the cumulative normal distribution relationship of cumula- tive retained fraction in % of feed to fibre length, the fibre length distribution of the pulp sample. The consistency meter operates on the principal of continuously vibrating a tube while continuously feeding pulp suspension therethrough and measuring the frequency of vibration of the tube to determine consistency substantially free of other properties of the pulp.

327146

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