Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1994-11-15
1996-09-10
Kwon, John T.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34116, F26B 1102
Patent
active
055533922
ABSTRACT:
An apparatus and method for drying a wet sheet material such as a paper web is presented. The apparatus is provided with a suitable number of dryer cylinders operating in conjunction with a plurality of steam blast ports disposed adjacent to the dryer cylinders. A vertically movable canopy hood and a middle hood having sheet entry/exit opening and a door opening device are provided. The wet sheet material is held between two endless fabric belts, and passed through the dryer cylinders alternatively via suction fabric rolls, fabric rolls and fabric tension rolls. The drying process is carried out in an atmosphere of superheated steam of over 100.degree. C. inside the canopy hood and the middle hood, and the steam generated from the wet sheets is recirculated through an exhaust screen, a super heated steam circulating fan, an adiabatic compressor and a supply duct. Another atmosphere of heated moist air having a dew point of at least 80.degree. C. is also employed. The dried paper product manufactured has high dimensional stability and exhibits superior printing characteristics and substantially increased paper strength, and the process permits highly energy conservation.
REFERENCES:
patent: 3643338 (1972-02-01), Fair
patent: 3815256 (1974-06-01), Ely
patent: 4365425 (1982-12-01), Gotchel
patent: 4932138 (1990-06-01), Liedes et al.
patent: 4980979 (1991-01-01), Wedel
patent: 5241760 (1993-09-01), Wedel
Kwon John T.
Tokushu Paper Mfg. Co., Ltd.
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