Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1995-01-11
1996-04-09
Lacey, David L.
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
162201, 427210, 100 93RP, 100 38, D21F 1100
Patent
active
055058205
ABSTRACT:
A paper rawstock web is wet densified on a papermachine at a moisture content greater than about 20% and less than about 50%, and preferably from about 25-35%, in a calender device at nip pressures greater than about 3000 psi, and preferably within the range of from about 3000-6000 psi, to provide fiber springback resistance and irreversibly smooth surfaces which are substantially resistant to loss of smoothness upon rewetting, as for example in a subsequent surface sizing or coating process. Wet densification according to the present invention produces a web having greater density and increased internal bond strength, as compared with webs treated by conventionally known methods, to achieve the irreversibly smooth surfaces.
REFERENCES:
patent: 3124504 (1964-03-01), Mahoney et al.
patent: 3647618 (1972-03-01), Back et al.
patent: 3647619 (1972-04-01), Mack et al.
patent: 4596633 (1986-06-01), Attwood
patent: 5316624 (1994-05-01), Racine
patent: 5378497 (1995-01-01), Johnson
"The Hydra-Nip Dryer: The Easy Way to Surface Smoothness", by M. Foulger, Tappi Journal, Sep. 1988, pp. 73-76.
Donigian Douglas W.
Fenton Suzanne S.
Ortman Bryan J.
Watkins Hiawatha P.
Fortuna Jos'e A.
Lacey David L.
Westvaco Corporation
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