Patent ID: 6464835
Filing Date: 2002-10-15
Classification: D21F

Abstract:
An equipment in a twin-wire former, in which a partly pre-drained or non-drained fibre stock is passed to between first and second forming wires (H1, H2) of the web former in the vicinity of the former roll (11) or of a water drain box (110), in which connection water is drained out of the stock web by means of the former roll (11) or the water drain box (110), wherein the twin-wire former comprises:a rib (20) in connection with the former roll (11) or the water drain box (110) in the lateral area of the wires (H1 and H2), which rib has been fitted to control the running of the second forming wire (H2) passed from a gap roll (12), and by means of which rib (20), in the lateral area of the wire runs, the point at which said second forming wire (H2) reaches contact with the first forming wire (H1) in connection with the former roll (11) or the water drain box (110) is shifted further away in the machine direction, and that the rib (20) is an oblong structure, which has a maximal height (Hmax) in the area between an inlet end (Hin) of the rib (20) and an outlet end (Hout) of the rib (20), in which case the thickness of the rib is increased when proceeding from the inlet end (Hin) of the rib to the position of maximal height (Hmax) of the rib, and the thickness of the rib is lowered when proceeding from the position of maximal height (Hmax) of the rib to the outlet end (Hout) of the rib.