Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Patent
1984-11-21
1986-06-24
Chin, Peter
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
100153, 100162R, D21F 1100
Patent
active
045966338
ABSTRACT:
Paper and paperboard which have been thoroughly dried but not calendered is provided with a smooth surface by rewetting a thin layer (5% to 10% of the thickness) along the surface and then pressing the resulting damp surface against a substantial portion of the surface of a heated dryer drum or other smooth-surfaced cylinder. This technique provides the web with a surface comparable in smoothness with what can be obtained by calendering but without the degree of compaction which occurs in calendering, due to the fact that with the major portion of the web dried, it is highly resistant to such compaction. The same method steps can be applied subsequently to the reverse side of the web to provide it with two smooth surfaces. It is also possible to forego the rewetting step if the initial drying of the web is unsymmetrical so that one surface remains wetter than the remaining portion of the web.
REFERENCES:
patent: 2251890 (1941-08-01), Montgomery
patent: 3024129 (1962-03-01), Brundige
patent: 3124504 (1964-03-01), Mahoney et al.
patent: 3149025 (1964-09-01), Dickens
patent: 3319352 (1967-05-01), Haigh
patent: 3362869 (1968-01-01), Welsh
patent: 3938261 (1976-02-01), Anderson
Chin Peter
The Black Clawson Company
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