Method and apparatus for uniformly drying a continuous web of ce

Details Method and apparatus for uniformly drying a continuous web of ce Method and apparatus for uniformly drying a continuous web of ce

1981-06-17

1983-04-05

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 23, 34 41, 34 54, 34111, 34116, 68 5D, 68205R, 8158, 162207, 162DIG6, 162DIG11, 134 15, 134122R, 134148, F26B 324, F26B 1308

Patent

active

043786391

ABSTRACT:
A method and apparatus used in the uniform drying of a continuous web, such as a sheet of paper or paperboard. A newly formed web of paper of wet cellulosic fibers and the necessary additives is initially directed through a press section where excessive water is squeezed from the web to reduce its moisture content to about 50-80 percent, by weight, for subsequent passage through a dryer section wherein the moisture content is further reduced to anywhere between 3 and 15 percent, depending on the quality of the paper being processed. The moisture content profile of the nearly dry web of paper is constantly monitored adjacent the discharge end of the dryer section for dry streaks which occasionally occur in the web. Moisture is added accordingly to the web when the web is relatively wet and has a moisture content of at least 25 percent to eliminate further dry streaks and provides a paper product which has a uniform moisture content.

REFERENCES:
patent: 2337163 (1943-12-01), Milne
patent: 2951007 (1960-08-01), Lippke
patent: 3089252 (1963-05-01), Daane et al.
patent: 3510374 (1970-05-01), Walker
patent: 3687802 (1972-08-01), Rummel et al.
patent: 3859163 (1975-01-01), Haythornthwaite

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