Paper making machinery

Details Paper making machinery Paper making machinery

F - Mech Eng,Light,Heat,Weapons

26

B

34/23

F26B 1/00 (2006.01) D21F 5/18 (2006.01) F26B 11/00 (2006.01) F26B 13/00 (2006.01)

Patent

CA 1185787

ABSTRACT A paper web drying apparatus having a through- drying 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 through- drying to take place during the final portion of the web travel.

401629

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