Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1982-09-22
1984-10-16
Chin, Peter
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162190, 162264, 162301, D21H 102, D21F 166
Patent
active
044773137
ABSTRACT:
In the production of multi-ply paper in a twin-wire former of the kind in which the wires define a curved forming zone, preferably a former of roll type with a smooth-faced forming roll, a substantially improved layer purity is produced in that the discharges from a first and at least succeeding portion of the curved forming zone are collected separately as different fractions. The first fraction collected nearest the multilayer headbox is returned in a first separate circuit to be used for diluting a first high consistency pulp to a first stock of headbox consistency, from which stock a first layer is to be formed directly on the outer wire in relation to the curved forming zone. At least a portion of a second fraction collected at a greater distance from the multilayer headbox is returned in a second separate circuit to be used for diluting a second high consistency pulp to a second stock of headbox consistency, from which a second layer is to be formed superimposed on the first layer.
REFERENCES:
patent: 3455780 (1969-07-01), Hazard et al.
patent: 3846232 (1974-11-01), Kankaanpaa
patent: 3923593 (1975-12-01), Verseput
patent: 3951736 (1976-04-01), Kobayashi
patent: 4267017 (1981-05-01), North
Simultaneous Forming of Multi-Layer Products--Some Problems and How to Solve Them, Ingmar Andersson, Paper Presented at Focus 82, Mar. 3-5, 1982, Loew's L'Enfant Plaza, Washington, D.C.
Aktiebolaget Karlstads Mekaniska Werkstad
Chin Peter
LandOfFree
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