D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
D21G 9/00 (2006.01) B03C 3/017 (2006.01) B03C 3/16 (2006.01) B05D 1/04 (2006.01) D21G 3/00 (2006.01) D21H 23/78 (2006.01)
Patent
CA 2305654
The present invention relates to a method and assembly for controlling the behaviour of particulate matter such as mist and dust occurring in the manufacture of paper and board. In the method, a web (1) is passed to web treatment equipment (22, 23) wherein at least one treatment step is applied to the web (1) causing the emission of said particulate matter (24). According to the method, in the vicinity of the emission point (21) of said particulate matter, are placed at least two electrodes (25, 26), and at least one electrode, called a counter-electrode (26), is taken to a low potential. Further, at least one electrode (25) is taken to a potential higher than that of said counter-electrode (26), and the potential difference between said electrodes (25, 26) is made so high as to generate a corona discharge between said electrodes that causes an ion-blast wind toward the electrode (26) of the lower potential, said ion-blast wind being capable of transferring particulate matter, which enters the gap between said electrodes, toward said electrode of lower potential.
L'invention porte sur un procédé et un dispositif permettant de contrôler les flux de matières particulaires telles que les brouillards ou poussières générés par la fabrication du papier et du carton. Selon le procédé une bande (1) passe dans ses équipements de traitement (22, 23) où elle subit au moins un traitement générateur desdites émissions particulaires (24). Selon l'invention deux électrodes (25, 26) sont placées au voisinage du point d'émission (21) dont l'une, dite contre-électrode, est à un faible potentiel, et l'autre à un potentiel plus élevé. La différence de potentiel entre les électrodes (25, 26) est suffisante pour produire entre elles une décharge corona causant un vent ionique en direction de l'électrode (26) à potentiel moindre, ledit vent ionique étant capable de transporter les matières particulaires pénétrant entre les électrodes vers l'électrode de potentiel moindre.
Gowling Lafleur Henderson Llp
Metso Paper Inc.
Valmet Corporation
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