| 摘要 |
<p>The invention relates to a method in a paper or board machine for dewatering the web prior to its passage to a press section, the dewatering being effected by means of a pair of rolls, which is located at the end of a wire section upstream of a pick-up suction roll (4) or a like transfer device and through which a wire (1) of the wire section and a web (W) supported thereby travel, and one of whose rolls receives water from the web over its area of contact with a path of travel formed by the wire (1) and the web (W). The other roll of said pair of rolls is on the opposite side in contact within said area of contact with the path of travel formed by the wire and the web, whereafter the web (W) supported by the wire (1) of the wire section is guided to the pick-up suction roll (4) or a like. Water is removed from the web (W) by means of an open-surfaced roll (3) included in the pair of rolls by using the combined action of said roll (3) and a roll (2) in contact with the path of travel from the opposite side to apply pressure on the web (W), by collecting water from the web (W) by means of the pressure into the open places in the surface of said roll (3), and by removing the water from the roll (3) through the action of a centrifugal force produced by rotation of the same.</p> |
