| 摘要 |
<p>A method in a headbox of a paper machine for stabilizing a jet flow discharged from a slice channel (16) and for controlling the edge areas of a paper or board web being prepared. In the method a slice channel (16) is used which, in the flow direction of the stock suspension, narrows and converges in the edge areas, on both sides in cross direction, of the web formed. A headbox according to the invention comprises an apron beam whose top wall forms the bottom wall of the slice channel (16). The slice channel (16) is from above defined by a planar top wall (14), which is hinge-jointed at one edge for adjustment of a slice opening (15). At the level of the bottom wall , the slice channel (16) narrows and converges linearly from the full width (Lmax) of a turbulence generator (13) down to the width (L0) of the slice opening. At the level of the top wall (14) of the slice channel (16) the width of the slice channel (16) is essentially retained the same and equal to the width (L0) of the slice opening.</p> |
