Apparatus and method for refining pulp stock

Details Apparatus and method for refining pulp stock Apparatus and method for refining pulp stock

D - Textiles, Paper

21

D

D21D 1/30 (2006.01) B02C 7/14 (2006.01) D21D 1/00 (2006.01) D21D 5/00 (2006.01)

Patent

CA 2103132

This invention relates to a method of refining pulp stock in which the pulp material to be ground is introduced into a grinding space located between a first rotatable grinding device carried by a shaft and being axially displaceable by a servo motor, and a second non- rotatable grinding device. The servo motor is actuated by pressurized fluid for adjusting and controlling the grinding space, producing a grinding pressure between the first and the second grinding devices and for preventing axial displacement of the first rotatable grinding device relative to the second non-rotatable grinding device in response to fluctuating axial grinding forces. The second non-rotatable grinding device comprises a plurality of concentrically arranged annular grinding members, at least one of which is axially adjustable by a setting device.

L'invention se rapporte à une méthode pour raffiner la pâte à papier, dans laquelle la pâte est introduite dans un espace compris entre un premier élément broyeur rotatif monté sur un arbre et animé d'un mouvement axial transmis par un servo-moteur et un deuxième élément de broyage non rotatif. Le servo-moteur est actionné par une pression hydraulique et sert à régler et à contrôler l'espace de broyage afin de maintenir la pression de broyage entre les premier et deuxième éléments broyeurs et prévenir le déplacement axial du premier élément broyeur rotatif par rapport à l'élément de broyage non rotatif en réaction aux fluctuations des forces de broyage axiales. Le deuxième élément broyeur non rotatif comporte une pluralité d'éléments de broyage annulaires disposés concentriquement; au moins un de ces éléments de broyage annulaires peut être réglé au moyen d'un dispositif de réglage.

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