Patent ID: 6558456
Filing Date: 2003-05-06
Classification: B03C,D21G,D21H

Abstract:
An apparatus for controlling particulate matter generated during the manufacture or processing of a web paper and board comprising:a first pair of electrodes proximate a location where the particulate matter is generated, one of the first pair of electrodes being positioned proximate a first side of the web and the other of the first pair of electrodes being positioned proximate a second side of the web; a first power supply connected to at least one electrode of the first pair of electrodes to enable a potential difference to be formed between the electrodes of the first pair of electrodes, the potential difference between the electrodes of the first pair of electrodes being such that a corona discharge is generated between the electrodes of the first pair of electrodes that causes an ion-blast wind toward the electrode with a lower potential, the ion-blast wind being sufficient to transport particulate matter passing between the first pair of electrodes toward the electrode with the lower potential, a second pair of electrodes downstream of the first pair of electrodes in a direction of movement of the web, one of the second pair of electrodes being positioned proximate a first side of the web and the other of the second pair of electrodes being positioned proximate a second side of the web; and a second power supply connected to at least one electrode of the second pair of electrodes to enable a potential difference to be formed between the electrodes of the second pair of electrodes, the potential difference between the electrodes of the second pair of electrodes being such that a corona discharge is generated between the electrodes of the second pair of electrodes that causes an ion-blast wind toward the electrode with a lower potential, the ion-blast wind being sufficient to cause particulate matter on the web passing between the second pair of electrodes to leave the web to travel toward the electrode with the lower potential.