Dryer section for drying a running web in a paper or board makin

Details Dryer section for drying a running web in a paper or board makin Dryer section for drying a running web in a paper or board makin

1988-06-29

1989-11-28

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34113, 34111, 34 31, F26B 1308

Patent

active

048828556

ABSTRACT:
An apparatus in the dryer section of a paper or board making machine, wherein the section has a plurality of dryers. There is an initial region of dryers, each of which heats the web somewhat more, but not to the level of the maximum evaporation rate of the moisture contained in the web. It is not until the web is passing the end of said initial region that the web is heated to such a high temperature that it reaches the maximum evaporation rate of moisture in the web. The dryers of the initial region have smaller diameters, which may gradually increase up to the region of maximum evaporation rate, or they may all be of one smaller size. Following the initial region the dryer section has a region of dryers in which each dryer heats the web to the maximum evaporation rate of the moisture contained in the web. The dryer at the beginning of that regions has the largest diameter. The following dryers in that region may have a small diameter, because with less remaining moisture in the web, the web needs to contact each succeeding dryer for a decreasing length of time to still reach the maximum evaporation rate of moisture. The dryers in the region of maximum evaporation rate may gradually decrease in size, or may be grouped in groups of decreasing size.

REFERENCES:
patent: 3981084 (1976-09-01), Sobota
patent: 4183148 (1980-01-01), Koski
"Wochenblatt for Papeirfabrikation", vol. 1; 1974, p. 18.
"Wochenblatt for Papierfabrikation", vol. 2; 1974, p. 51.
Jahrgang, vol. 7; 1980; p. 286.
Friedrich Muller, "Die Paperfabrikation und deren Maschinen"; pp. 125, 273 and 274.

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