| 摘要 |
A twin-wire former of a paper or board machine comprises a single-wire initial dewatering section and a twin- wire zone in which inside an upper- wire loop (21) there is a dewatering box (23) provided with a curved cover which guides the upper wire (21) into contact with a stock layer on a lower wire (11). In connection with the dewatering box (23), there is a first dewatering zone (ZB<SUB>II</SUB>) in which the cover (27) of the dewatering box is designed so that it produces non-pulsating dewatering of the stock between the wires (11, 21) and a second dewatering zone (ZB<SUB>II</SUB>) in which the cover of the dewatering box consists of cross-directional de watering blades (28) which produce pulsating dewatering of the stock between the wires (11, 21). At the area of the second dewatering zone (ZB<SUB>II</SUB>), the upper wire (21) is supported against the dewatering blades (28), the lower wire (11) being unsupported. After the dewatering box (23) inside the lower wire loop (11), there is a forming shoe (16) provided with a curved cover before a transfer suction box (17). |
