Multilayer headbox

Details Multilayer headbox Multilayer headbox

1994-08-15

1996-08-13

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162336, 162344, D21F 102

Patent

active

055452949

ABSTRACT:
A three-layer headbox has two rigid separator vanes (11; 12) mounted in the headbox slice chamber (10) to form two outer stock flow channels (39; 41) and an intermediary one (40). The upstream end of each vane (11; 12) is securely fixed in cantilever fashion and its downstream end (15; 16) is unattached and free and provided with a vane extension (17; 18). Also the downstream end (20; 22) of the extension (17; 18) is unattached and free and is located just downstream of the slice opening (14). The vane extension (17; 18) is thinner than the vane (11; 12), so that a step (23, 24) is formed on each side of the vane (11; 12) and extension (17; 18) assembly. To improve the layer formation, each vane (11; 12) and each vane extension (17; 18) has a portion located in a converging downstream portion (13) of the slice chamber (10), and the vane portions and the extension portions are of substantially equal length. Preferably, the vane extension (17; 18) is tapered, as rigid as possible, and consists of glass fiber reinforced epoxy resin. Further, the step (23) located in the outer channel (39; 41) is about twice as high as the step (24) located in the intermediary channel (40).

REFERENCES:
patent: 4181568 (1980-01-01), Pfaler
patent: 4436587 (1984-03-01), Andersson
patent: 4566945 (1986-01-01), Ewald et al.
patent: 4617091 (1986-10-01), Rodel et al.
patent: 4812209 (1989-03-01), Kinzler et al.
patent: 4891100 (1990-01-01), Hildebrand
patent: 5431785 (1995-07-01), Bubik et al.

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