Method and apparatus for producing mechanical fibers

Details Method and apparatus for producing mechanical fibers Method and apparatus for producing mechanical fibers

D - Textiles, Paper

21

D

D21D 1/20 (2006.01) D21B 1/12 (2006.01)

Patent

CA 2503595

The purpose of this invention is to provide a method and an apparatus for producing thermomechanical fibers using less energy per ton that has previously been required for similar type of production. The invention is based in that at least two refiners are combined so that mixture of chips, water and steam is first fed into a first refiner wherein the chips are broken up and the mass flow from the first refiner is then fed into the second refiner for breaking the fibers to final freeness level. The mass flow of steam and fibers is fed forwards at least in the first refiner by the rotational energy of the refiner rotor so that essentially no flowback of the steam occurs. The mass flow exciting the first refiner is fed completely to the second refiner and no steam is extracted from the mass flow before the second refiner.

L'invention concerne un procédé et un appareil permettant de produire des fibres thermomécaniques avec une énergie par tonne inférieure à celle requise auparavant pour un type de production similaire. L'invention se base sur le fait qu'au moins deux raffineurs sont combinés de façon que le mélange de copeaux, d'eau et de vapeur soit d'abord amené dans un premier raffineur dans lequel les copeaux sont brisés, puis la masse du premier raffineur est amenée dans le second raffineur afin que les fibres soient brisées pour obtenir un degré de raffinage final. La masse de vapeur et de fibres est finalement amenée une nouvelle fois dans le premier raffineur au moyen de l'énergie rotative du rotor du raffineur de façon qu'aucun écoulement en retour de vapeur ne se produise. La masse quittant le premier raffineur est entièrement amenée au second raffineur et aucune vapeur n'est extraite de la masse avant le second raffineur.

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