Method for controlling drying of a web-formed material

Details Method for controlling drying of a web-formed material Method for controlling drying of a web-formed material

2005-09-06

2005-09-06

Lu, Jiping (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

C034S446000, C034S487000, C034S491000, C034S492000

Reexamination Certificate

active

06938359

ABSTRACT:
A web-formed material (1), preferably a pulp web (1), is passed through a drying plant, comprising blow boxes arranged in a plurality of drying decks, floating above lower blow boxes, which at their upper sides blow out hot process air against the web-formed material (1). Water, in the form of steam, escaping from the web-formed material (1) is discharged by the process air, at least part of which is recirculated (43) whereas the non-recirculated process air is discharged as exhaust air (41) and is replaced by a corresponding portion of supply air (42) with a low water content. The temperature of the process air is controlled (4). If a deviation from the desired dry content of the dried web-formed material (1) is detected (6), the volume flow of the process air (40) is changed by increasing the volume flow of the process air (40) at too low a dry content in the web-formed material (1), and by decreasing the volume flow of the process air (40) at too high a dry content in the web-formed material, for the purpose of rapidly regaining the desired dry content of the dried web-formed material (1).

REFERENCES:
patent: 3161482 (1964-12-01), Gschwind et al.
patent: 4696115 (1987-09-01), Spadafora
patent: 4719708 (1988-01-01), Karlsson et al.
patent: 5136790 (1992-08-01), Hagen et al.
patent: 514397 (2001-02-01), None

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