Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-06-20
1990-04-17
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162300, 162352, D21F 100
Patent
active
049177664
ABSTRACT:
Hybrid former for a paper machine which has a lower-wire loop forming a single-wire dewatering zone in which water is removed from a web being formed by a dewatering member situated inside the wire loop through the lower wire. The former also has an upper-wire unit which includes an upper-wire loop forming a second twin-wire dewatering zone after the first single-wire dewatering zone, together with a run of the lower wire. The former additionally includes a hollow-faced first forming roll fitted inside the upper-wire loop, at which the second, twin-wire dewatering zone starts, this zone being curved upwardly over a certain sector of this forming roll. A forming shoe is fitted inside the lower-wire loop after the forming roll and guides the second dewatering zone. This forming shoe is provided with a curved deck for guiding the lower-wire loop. Deflector units are fitted both inside the lower-wire loop and inside the upper-wire loop on the twin-wire dewatering zone between the first forming roll and the forming shoe. By way of these deflector units, sufficiently strong impulses improving the formation of a web are produced, which act upon the web that is being formed from both sides thereof.
REFERENCES:
patent: 3994774 (1976-11-01), Halme et al.
patent: 4532008 (1985-07-01), Creagon et al.
patent: 4557802 (1985-10-01), Waris et al.
patent: 4609435 (1986-09-01), Tissari
patent: 4623429 (1986-11-01), Tissari
Koivuranta Mauri
Odell Michael
Hastings Karen M.
Valmet Paper Machinery Inc.
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