Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1990-10-24
1991-12-24
Chin, Peter
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162308, 162363, 162364, 162369, 162370, D21F 148
Patent
active
050749668
ABSTRACT:
A gap former in a paper machine, comprising a lower wire loop (10) and an upper wire loop (20), which together define a substantially horizontal twin wire forming zone, which comprises the following web forming zones (a), (b) and (c): (a) In the area of the forming gap (G), a first suction zone (11a) placed inside the first forming roll (11), and immediately thereafter a second suction zone (11b) is placed in forming roll (11). The suction zones (11a, 11b) are placed in the first upper quarter of the first forming roll (11) at the side of the forming gap (G). The levels of negative pressure (P.sub.1, P.sub.2) in the suction zones are adjustable. (b) A forming shoe (12), which is provided with an open guide deck (26), the interior space in the shoe being divided into at least two subsequent suction chambers (12a, 12b, 12c), the levels of negative pressure (P.sub.a, P.sub.b, P.sub.c) effective in said suction chambers being arranged to be adjustable, preferably separately adjustable. (c) Web-formation and/or guide members (13a, 13b, 17, 25) arranged after the forming shoe (12), the members guiding the twin wire zone downwards.
REFERENCES:
patent: 3839143 (1974-10-01), Suckow
patent: 4925531 (1990-05-01), Koski
Chin Peter
Valmet Paper Machinery Inc.
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