Apparatus for changing the moisture content of paper webs or the

Details Apparatus for changing the moisture content of paper webs or the Apparatus for changing the moisture content of paper webs or the

1974-12-19

1977-07-05

O'Dea, William F.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34117, F26B 1308

Patent

active

040330494

ABSTRACT:
A drying apparatus for wet paper webs which employs a rotary drum having a foraminous cylindrical wall and being located between but spaced apart from two parallel drying rolls with foraminous or impermeable cylindrical walls. The major part of the drum is surrounded by a hotair hood, and an endless wire screen is trained over the rolls as well as over that part of the drum which is surrounded by the hood. The screen forms a loop which surrounds a stationary suction chamber extending into the space between the rolls and having an open side facing the drum as well as the spaces between the drum and the rolls. The suction chamber has one or more sealing strips which are closely adjacent to the screen upstream of the first roll (as considered in the direction of transport of a web) and downstream of the second roll. The leader of the web is threaded between the screen and the first roll, thereupon around the drum between the screen and the hood, and finally between the screen and the second roll.

REFERENCES:
patent: 2303123 (1942-11-01), Johannessen
patent: 3089252 (1963-05-01), Daane et al.
patent: 3110575 (1963-11-01), Justus
patent: 3418723 (1968-12-01), Burgess et al.
patent: 3727325 (1973-04-01), Fleissner et al.
patent: 3816941 (1974-06-01), Halik et al.
patent: 3874997 (1975-04-01), Kankaanpaa
patent: 3891500 (1975-06-01), Kankaanpaa

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