Apparatus and method for particle comminution

B - Operations – Transporting – 02 – C

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B02C 7/14 (2006.01) D21D 1/00 (2006.01) D21D 1/20 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2222114

An apparatus and method are provided in which direct ohmic connection (G) is made to a comminution device (GD) (e.g., a wood chip or pulp refiner) to obtain transient voltages, existing on the refining elements, that are directly related to fiber impacts. These voltages, existing on the refining elements, that are directly related to fiber impacts. These voltages are characterized by severity (S) (i.e., magnitude), rate (N), rise time (RT) and polarity (+/-P). The characteristics of these voltages taken separately and/or in mathematical combinations predict the properties of refined wood chips and pulps, i.e., freeness, tensile strength, tear, burst, breaking length and fiber length. Signal characteristics further track refiner plate wear and detect the occurrence of "critical gap" (F) as well as the onset of plate clash.

L'invention concerne un dispositif et un procédé de réduction en particules. Un système de broyage (C,D) (par exemple, un raffineur de copeaux ou de pâte à papier) est pourvu d'une liaison conductrice (G), afin d'obtenir des tensions transitoires, qui existent sur les éléments de raffinement et sont en rapport direct avec les impacts de fibres. Ces tensions sont caractérisées par l'importance (S) (c'est-à-dire, l'amplitude), la vitesse (N), le temps de montée (RT) et la polarité (±P). Les caractéristiques de ces tensions prises séparément et/ou en combinaisons mathématiques prédisent les propriétés de copeaux de bois et de pâtes à papier raffinés, telles que la valeur d'égouttage, la résistance à la traction, la déchirure, l'éclatement, la longueur de rupture et la longueur de fibre. De plus, des caractéristiques produisant des signaux surveillent l'usure des plaques du raffineur et détectent l'apparition d'un "écart critique" (F) ainsi que celle d'un choc entre les plaques.

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