Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1992-06-24
1995-02-07
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162352, 162374, D21F 100, D21F 154, D21F 148
Patent
active
053873203
ABSTRACT:
The invention concerns a twin-wire web former in a paper machine, comprising a carrying wire and a covering wire which together form a twin-wire forming zone. In this forming zone, a forming unit is fitted, which comprises a forming board and a drainage box placed one opposite the other. In the forming board placed facing the drainage box there are a number of transverse loading ribs placed at a distance from each other. Subsequent transverse loading ribs are interconnected by intermediate parts which, together with the transverse loading ribs form ribbed shoes. These shoes can be loaded by means of loading hoses to produce a dewatering pressure in the web (W) placed between the wires. In the area of the forming unit the dewatering takes place both through the covering wire and through the carrying wire also toward the forming board through the open spaces placed between its transverse loading ribs.
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patent: 4988408 (1991-01-01), Evalahti
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patent: 5061347 (1991-10-01), Bubik et al.
patent: 5076894 (1991-12-01), Simmons
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patent: 5185064 (1993-02-01), Nyman
patent: 5262010 (1993-11-01), Bubik et al.
"Twin-Former SP-das fortschrittliche Hybridformersystem mit universellem Einsatzbereich", J. Schweiger and A. Bubik, Wochenblatt Fur Papierfabrikation Sep. 1991, pp. 323-329.
Hastings Karen M.
Valmet Paper Machinery Inc.
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