Paper making and fiber liberation – Apparatus – Automatic control
Patent
1984-01-16
1985-10-08
Alvo, Steve
Paper making and fiber liberation
Apparatus
Automatic control
34 48, 34 54, 162290, 162359, D21F 180, D21F 500, F26B 1302, F26B 2112
Patent
active
045458570
ABSTRACT:
A steam box or hood for controlling the moisture profile of a fibrous web such as paper during forming and pressing is described. The steam hood includes a plenum filled with nonturbulent, substantially atmospheric pressure steam which delivers the steam into a series of side-by-side compartments which extend across the width of and adjacent to the web. Each compartment includes a damper, the position of which is individually controllable through a rod adjustment from the operating side of the machine. The position of the damper determines the amount of steam applied to the web from a compartment and hence the moisture content of the web adjacent to the particular compartment being adjusted. Each compartment is adjusted to achieve a desired uniform moisture content across the width of the web.
REFERENCES:
patent: 3416237 (1968-12-01), Sutherland et al.
patent: 3516607 (1970-06-01), Shelor
patent: 3711957 (1973-01-01), Carver, Jr.
patent: 3726757 (1973-04-01), Dupasquier
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patent: 3945570 (1976-03-01), Dove
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patent: 4312139 (1982-01-01), Preisler et al.
patent: 4330947 (1982-05-01), Throp
patent: 4331510 (1982-05-01), Wells
patent: 4351700 (1982-09-01), Dove
"Profile Analysis for Evaluation of a Compartmentized Steam Box", by Chari et al., TAPPI Annual Meeting Preprint, (Mar. 15, 1976).
Alvo Steve
Weyerhaeuser Company
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