Patent ID: 7300553

Claim:
A forming section of a paper or board machine, comprising: a first forming wire forming a first wire loop and mounted to travel in a defined running direction, the first wire loop having a web receiving surface; a second forming wire forming a second wire loop which forms a twin-wire zone with the first forming wire, and which is mounted to travel in the defined running direction; a suction roll positioned within the first wire loop, the suction roll having a cylindrical suction surface engaged with the first forming wire, and having a suction zone; a suction box having a curved surface positioned within the second wire loop and positioned with the curved surface in opposed relationship with the suction roll; wherein the suction zone of the suction roll has a portion which extends in the running direction beyond the suction box so that a web passing between the suction roll and the suction box is guided, due to the effect of the suction zone of the suction roll, forwards on the web receiving surface of the first wire loop; and wherein the suction roll suction zone is divided into a first suction zone opposite the suction box, and a second suction zone which forms the portion which extends in the running direction beyond the suction box so that a web passing between the suction roll and the suction box is guided, due to the effect of the second suction zone of the suction roll, forward on the web receiving surface of the first wire loop.