Refiner plates with injector inlet

B - Operations – Transporting – 02 – C

Patent

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Details

B02C 7/12 (2006.01) B02C 7/00 (2006.01) B02C 7/02 (2006.01) B02C 7/06 (2006.01) B02C 7/11 (2006.01) D21D 1/30 (2006.01)

Patent

CA 2387425

A refiner for refining lignocellulosic material having opposed, relatively rotating, rotor and stator refiner plates. The refiner plates each have radially inner and outer edges and an inlet zone extending radially outward from the inner edge. The inlet zone of each refiner plates has a radially inner portion and a radially outer portion. The inner portion of the rotor plate includes a plurality of breaker bars which curve in a direction which is opposite to the direction of rotation of the rotor plate and which extend to a height substantially equal to one-half of the refining gap. The outer portion of the inlet zone of the stator plate has a plurality of dams. Each of the dams has an upper ramp surface extending to an outer end having a curved profile. The outer portion of the inlet zone of the rotor plate and the inner portion of the inlet zone of the stator plate may each have either a smooth surface or a plurality of outwardly extending low profile protrusions.

L'invention concerne un raffineur destiné à raffiner une matière cellulosique présentant des plaques de raffineur stator et rotor opposées, en rotation relative. Les plaques de raffineur présentent chacune des bords radiaux intérieurs et extérieurs, ainsi qu'une zone d'admission s'étendant radialement vers l'extérieur à partir du bord intérieur. La zone d'admission de chaque plaque de raffineur comprend une partie radiale intérieure et une partie radiale extérieure. La partie intérieure de la plaque rotor comprend plusieurs lamelles courbées dans le sens opposé au sens de rotation de la plaque rotor et s'étendant vers une hauteur sensiblement égale à une moitié du trou de raffineur. La partie extérieure de la zone d'admission de la plaque stator comporte plusieurs seuils. Chaque seuil comprend une surface de rampe supérieure s'étendant vers une extrémité extérieure présentant une zone courbe. La partie extérieure de la zone d'admission de la plaque rotor et la partie intérieure de la zone d'admission de la plaque stator peuvent, toutes deux, comporter une surface souple ou plusieurs saillies en faible retrait s'étendant vers l'extérieur.

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