Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1997-05-30
1999-08-10
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162133, 162125, 162298, 162300, 162304, 162DIG7, 162352, D21F 1100, D21F 100
Patent
active
059353821
ABSTRACT:
In order to meet higher demands for the properties of paperboard products an improved method and machine for the manufacture of paperboard are proposed according to the present invention in which a core of a paperboard web is formed in a second forming unit from a stock with a consistency of 1.5-6.0% being supplied to the fourdrinier wire of a fourdrinier former carrying a back layer formed previously in a first forming unit, from a headbox for high consistency stock and being dewatered upon being enclosed between the fourdrinier wire and a top wire in said second forming unit, and in which an underliner is formed in a third forming unit of stock with a consistency of 0.3-1.4% being supplied to the fourdrinier wire carrying the back layer and core, from a headbox for stock of low consistency. In both cases dewatering occurs under the influence of upper and lower tables in the loop of respective top wires, said tables having slats separated by spaces and defining between them a passage through which a sandwich structure consisting of the fourdrinier wire, top wires and stock layer is conveyed and influenced alternatively by upper and lower slats so that the stock layer is compressed alternately from above and below, pressure pulses and shear forces thus being created in the stock layer. Furthermore, in the second forming unit for high consistency forming the stock layer is kept in a fluidized state.
REFERENCES:
patent: 2881670 (1959-04-01), Thomas
patent: 2881672 (1959-04-01), Thomas
patent: 3992252 (1976-11-01), Coleman
patent: 4961824 (1990-10-01), Laitinen et al.
patent: 4988408 (1991-01-01), Evalahti
patent: 5045153 (1991-09-01), Sollinger et al.
patent: 5074964 (1991-12-01), Partanen
patent: 5190090 (1993-03-01), Corbellini et al.
patent: 5262010 (1993-11-01), Bubik et al.
patent: 5427654 (1995-06-01), Gray et al.
patent: 5486270 (1996-01-01), Schiel
patent: 5507918 (1996-04-01), Polifke et al.
patent: 5554267 (1996-09-01), Grossmann et al.
patent: 5584967 (1996-12-01), Grossmann et al.
T. Waris, A headbox for high consistency forming, Paper Technology 31, No. 2:14-18 (Feb., 1990).
Huovila Vesa Tapani
Sandgren Nils Borje
Fortuna Jos'e A.
Silverman Stanley S.
Valmet-Karlstad AB
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