| 摘要 |
<p>A method and apparatus for improving forming of a web of paper or paper board employing prepressing during web forming. Forming wires (4, 6) are brought together over at least one roll (109) or alternatively two rolls (10, 12). The web then passes, sandwiched between two wires (4, 6) through one or more pressure nips which may be one or more roll nips (N1, N2) or an extended nips. The pressure nip may be formed as the web travels between the two fabrics, one of them being a forming wire, along a straight path or alternatively as the web travels partially around a roll. The web is then sandwiched between a wire and a fabric, which may be a felt or a belt, and passed through another press nip which may be one or more roll nips or an extended nip.</p> |
