Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1991-09-12
1994-10-11
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34113, F26B 1102
Patent
active
053535219
ABSTRACT:
The present invention is directed to a method and apparatus for drying a web of paper utilizing impulse drying techniques. In the method of the invention for drying a paper web, the paper web is transported through a pair of rolls wherein at least one of the rolls has been heated to an elevated temperature. The heated roll is provided with a surface having a low thermal diffusivity of less than about 1.times.10.sup.-6 m.sup.2 /s. The surface material of the roll is preferably prepared from a material selected from the group consisting of ceramics, polymers, glass, inorganic plastics, composite materials and cermets. The heated roll may be constructed entirely from the material having a low thermal diffusivity or the roll may be formed from metal, such as steel or aluminum, or other suitable material which is provided with a surface layer of a material having a low thermal diffusivity.
REFERENCES:
patent: 2209759 (1940-07-01), Berry
patent: 3456931 (1969-07-01), Ermenc et al.
patent: 4888095 (1989-12-01), Gulya et al.
patent: 4912835 (1990-04-01), Harada et al.
Bennet Henry A.
Institute of Paper Science and Technology, Inc.
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