Method and apparatus for assaying wood pulp fibers

G - Physics – 01 – N

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G01N 21/64 (2006.01)

Patent

CA 2555968

Paper pulp is added to a stain solution. The stain solution and pulp fibers are mixed to form a slurry. Samples are removed from the slurry and are admixed with dilution water and a bleach. Then, the fibers are moved into a flow cell (20) where they are subjected to a light source (40) adapted to stimulate fluorescence from the stained pulp fiber.

Selon le mode de réalisation de cette invention, on ajoute de la pâte à papier à un liquide colorant. On mélange le liquide colorant et les fibres de pâte à papier pour former une suspension. On prélève des échantillons de la suspension, que l'on mélange avec de l'eau diluée et une solution de blanchiment. Ensuite, on déplace les fibres dans une cuve de circulation où on les soumet à une source lumineuse conçue pour stimuler la fluorescence à partir des fibres de pâte à papier colorées. Avant que la suspension ne parvienne à la cuve de circulation, on la mélange avec une solution aqueuse diluée de blanchiment afin de réduire la fluorescence de fond. On collimate la lumière fluorescente puis on l'oriente à travers un filtre dichroïque sur un filtre dichroïque séparateur de fluorescence.

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