Dewatering element having non-pulsing dewatering followed by pulsing dewatering

A forming section of a paper or board machine in the forming section of a paper or board machine has a cover having an outlet groove between a suction zone of circular holes and an outlet edge . A wire comes to the cover area from an inlet edge and leaves from an outlet edge . The outlet groove is essentially in the cross-machine direction of the cover . The suction zone accomplishes non-pulsating dewatering, and the outlet groove accomplishes pulsating dewatering. The non-pulsating suction zone first accomplishes good retention, and after this formation is improved on the outlet groove. When pulsating dewatering takes place in the same direction as non-pulsating dewatering and immediately after non-pulsating dewatering, the web formed has a particularly good formation potential. Potential marking caused by non-pulsating dewatering can also be removed efficiently by means of pulsating dewatering taking place on the same side.