Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1991-12-04
1993-07-06
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162300, 162DIG7, D21F 100, D21F 136
Patent
active
052250431
ABSTRACT:
A twin screen paper forming apparatus is provided having upper and lower screens moving in a first direction and wrapping around a portion of a leading forming roller positioned at the beginning of a forming zone where the upper and lower screens converge to form a twin screen. At least one stationary forming element is positioned downstream of the leading forming roller to contact with the lower screen. A water guide element is also located in the region of the forming zone approximately at the start of the forming zone. At least one forming rail contacts the upper screen and a pulp suspension discharge nozzle is positioned, to prevent preliminary draining, upstream of the location where the upper and lower screens converge.
REFERENCES:
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patent: 4209360 (1980-06-01), Stenberg et al.
patent: 4523978 (1985-06-01), Pullinen
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patent: 4609435 (1986-09-01), Tissari
patent: 4917766 (1990-04-01), Koivuranta et al.
patent: 4925531 (1990-05-01), Koski
Braun Heinz
Bubnik Alfred
Holik Herbert
Kurtz Rudiger
Steckenreuter Heinz
Hastings Karen M.
Sulzer-Escher Wyss GmbH
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