Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-07-13
1990-04-24
Chin, Peter
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162301, 162306, 162308, 162312, D21F 136
Patent
active
049197606
ABSTRACT:
A web former for a paper machine having a lower-wire loop which forms an initial single-wire part of a dewatering zone. The former also includes a top-wire unit which includes an upper wire which forms a twin-wire dewatering zone together with the lower wire. The former also includes a first forming roll in a direction of web travel that is provided with an open hollow face and is fitted inside the upper-wire loop. The twin-wire forming zone begins in conjunction with the first forming roll. There is a forming shoe inside the lower-wire loop which is provided with a curved deck that guides the lower-wire loop. The former includes a second forming roll fitted inside the upper wire loop and situated after the forming shoe. A device for collecting water is provided in the former and operates without any external suction source, with dewatering being based upon kinetic energy of water that is being removed and/or upon gravity.
REFERENCES:
patent: 4523978 (1985-06-01), Pullinen
patent: 4686004 (1987-08-01), Fujiwara
Chin Peter
Dang Thi
Valmet Paper Machinery Inc.
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