Adjustable twin-wire former with suction boxes for simultaneous drainage in both directions
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United States of America Patent
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Feb 6, 1996
Issued Date -
N/A
app pub date -
May 4, 1994
filing date -
Oct 14, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An adjustable twin-wire gap former is provided for forming a fiber web from an aqueous fiber suspension. The twin-wire gap former is arranged so that the first and second coacting, traveling, looped forming wires have juxtaposed sections, which define a forming zone and confine a paper web therebetween during its formation. A first means for providing suction is located adjacent the first wire fabric in the forming zone for draining water from the suspension and a second means for providing suction is located adjacent the second wire fabric in the forming zone. This second means for providing suction is movable toward and away from the second wire thus adjusting the geometry of the forming zone. Preferably a central operator controls the vacuum in the suction boxes and the pressure exerted by the boxes onto the forming fabric independently of each other.
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