Process and apparatus for drying sheet materials

Details Process and apparatus for drying sheet materials Process and apparatus for drying sheet materials

1996-05-02

1997-07-15

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34116, F26B 1102

Patent

active

056471416

ABSTRACT:
An apparatus 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.

REFERENCES:
patent: 2477949 (1949-08-01), Amonsen
patent: 2835047 (1958-05-01), Fleissner et al.
patent: 3163502 (1964-12-01), Justus et al.
patent: 3576078 (1971-04-01), Holt
patent: 3956832 (1976-05-01), Justus
patent: 4103434 (1978-08-01), Walker
patent: 4116022 (1978-09-01), Lopata et al.
patent: 4124941 (1978-11-01), Birke et al.

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