Paper web drying apparatus having a hood with two sections
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United States of America Patent
Stats
-
Jul 31, 1984
Grant Date -
N/A
app pub date -
Apr 26, 1982
filing date -
Apr 27, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A paper web drying apparatus having a throughdrying drum wherein heated air is supplied beneath a hood around a portion of the periphery of the drum through which the air may pass, the hollow interior of the drum being connected to exhaust means, the hood distributing heated air to the surface of the web, the improvement according to the invention comprises dividing the hood into at least two separate sections, the section adjacent the web inlet having a series of nozzles connected to a source of heated air and interspersed air ducts or the like connected to air exhaust means, the section adjacent the web outlet being connected to a source of heated air but not to exhaust means. This enables impingement drying to take place adjacent the web inlet, impingement and throughdrying to take place at a point further along the arc of travel of the web beneath the web and only throughdrying to take place during the final portion of the web travel.
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