Patent ID: 8133355

Claim:
Method in the wet end of a web forming machine, in which method water is removed from the web (P) being formed so as to increase the solids content of the pulp suspension, wherein the method comprises (a) placing at least one electrode pair ( 102 , 103 ) in the wet end, (b) supplying said electrode pair ( 102 , 103 ) with a current/voltage from a power source ( 100 ), so that between said electrode pair ( 102 , 103 ) an electric field is set up, causing material particles ( 110 , 111 ) in the pulp suspension in the wet end to be electrically charged, (c) controlling the current/voltage of said power source ( 100 ) by means of a measuring and control unit ( 101 ) so as to cause said material particles ( 110 , 111 ) in said pulp suspension to be electrically charged, with the result that the retention, formation and orientation of said material particles ( 110 , 111 ) in said pulp suspension are substantially improved, and (d) forming said at least one electrode pair ( 102 , 103 ) from dilution pipes ( 37 ) of a headbox ( 20 , 30 ).