Dryer section for a paper making machine with differing suction

Details Dryer section for a paper making machine with differing suction Dryer section for a paper making machine with differing suction

1992-03-02

1993-09-07

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34114, 34123, 162363, F26B 1102

Patent

active

052417611

ABSTRACT:
A dryer section for a machine for drying a fibrous web and particularly a paper web. The dryer section comprises a row of dryer cylinders which alternate with reversal suction rolls along the path of the web. The dryer cylinders are separated into at least an upstream first dryer part and a downstream second dryer part in the path of the web through the dryer section. A continuous supporting belt travels along with the web alternately over each dryer cylinder and its associated suction roll in respective dryer groups in each of the upstream and downstream dryer parts. Every suction roll in the upstream first part has a stationary suction box in it. Every suction roll in the downstream second part does not have a suction box. All of the suction rolls have a perforated roll shell. The density of the perforations in the roll shell of the suction rolls in the first upstream part is at least twice as great as the density of the perforations in the roll shell of the suction rolls in the second downstream part. The first suction rolls have a smaller diameter than the second suction rolls.

REFERENCES:
patent: 3868780 (1975-03-01), Soininen et al.
patent: 4202113 (1980-05-01), Kankaanpaa
patent: 4481723 (1984-11-01), Vedenpaa 34117

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