Apparatus for stabilizing the jet flow exiting a headbox of a pa

Details Apparatus for stabilizing the jet flow exiting a headbox of a pa Apparatus for stabilizing the jet flow exiting a headbox of a pa

1988-12-19

1990-05-22

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162344, 162346, D21F 102

Patent

active

049274996

ABSTRACT:
Apparatus for stabilizing a jet flow (J) discharged from a headbox slice channel (16) of a paper machine and for controlling the edge area of a paper or board web. In the flow direction (F) of the stock suspension, the slice channel (16) narrows and converges in the edge areas thereof, on both sides in cross direction of the web formed. The top wall (25) of an apron beam (24) forms the bottom wall of the slice channel (16). The slice channel (16) is defined by a planar top wall (14), which is hinge-jointed at the upstream edge of adjustment of the slice opening (15). At the level of the bottom wall (25), the slice channel (16) narrows and converges linearly from the full width (L.sub.max) of a turbulence generator (13) down to the width (L.sub.0) 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 (L.sub.0) of the slice opening.

REFERENCES:
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patent: 3434923 (1969-03-01), Dennis
patent: 4081321 (1978-03-01), Wolf et al.
patent: 4137124 (1979-01-01), Bubik et al.
patent: 4687548 (1987-08-01), Ilmoniemi et al.
E. Weisshuhn and H. Dahl: Einflues des Stofflaufs auf Blatteigenschaften und deren Konstanz. Das Papier, 10A, 151-164, (1986).
D. Egelhof: Der Einflus des Stoffauflaufes auf Asymetriefehler im Papier. Das Papier, 7, 313-318, (1986).
P. Soikkanen: Sym-Flow, the Versatile Headbox, Fifth Valmet Paper Machine Days, 1986.

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