Steam blast box and method for the zone-wise temperature control

Details Steam blast box and method for the zone-wise temperature control Steam blast box and method for the zone-wise temperature control

1996-09-17

1997-11-25

Sollecito, John M.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34119, 34122, 34124, D21F 500

Patent

active

056898975

ABSTRACT:
A steam blast box for applying steam to a web of paper conducted over a roll of a paper machine. The box has a closed steam blast chamber which extends along the roll transverse to the direction of travel of the web and to which steam can be fed. The front wall of the box, which faces the roll, has a plurality of steam outlet openings. A steam propagation space is formed between the front wall of the steam blast box and the roll. For controlling the temperature and/or for regulating the amount of heat transferred to the web of paper in the steam propagation space, an air outlet channel, which extends transverse to the direction of travel of the web and is located at the web inlet end of the steam propagation space, is provided for the admixing of air in the steam. In this way, sensitive separate, zone-wise control of the heating of the paper web can be obtained. The steam propagation space can be cooled zone-wise by feeding air on the inlet side. Air and steam are drawn off at the outlet end of the propagation space, also zone-wise across the web.

REFERENCES:
patent: 4330947 (1982-05-01), Throp
patent: 4351700 (1982-09-01), Dove
patent: 4580315 (1986-04-01), Boissevain
patent: 4662398 (1987-05-01), Wyuwailowski et al.
patent: 4671173 (1987-06-01), Boissevain
patent: 4836894 (1989-06-01), Chance et al.
patent: 4867054 (1989-09-01), Taylor
patent: 5477824 (1995-12-01), Haessner et al.
patent: 5519935 (1996-05-01), Ahvenniemi et al.

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