Drying and gas or vapor contact with solids – Process – Gas or vapor contact with treated material
Patent
1997-06-18
2000-08-22
Wilson, Pamela A.
Drying and gas or vapor contact with solids
Process
Gas or vapor contact with treated material
34457, 34458, 34116, F26B 1308
Patent
active
061052779
ABSTRACT:
A system (20) and associated process for use in the dryer section (18) of a papermachine for promoting complete support of the paper web (32) by the carrier fabric (34) as the fabric and web are transferred between adjacent drying cylinders (22, 24) by way of a turning roll (26) utilizes a blowbox assembly (50) positionable within the pocket region (40) bounded by the drying cylinders and the turning roll. The blowbox assembly is adapted to direct air out of the pocket region to reduce the likelihood of separation of the web from the carrier fabric as the web is moved onto and off of the turning roll. The blowbox assembly cooperates with the vacuum source (30) associated with the turning roll so that upon a reduction of the energy expended by the vacuum source associated with the turning roll, constant sub-atmospheric conditions can be maintained within the pocket region by increasing the expenditure of energy of the air-directing means by an amount which is less than the amount of the reduction of energy expended by the vacuum source.
REFERENCES:
patent: 4553340 (1985-11-01), Petersson
patent: 4876803 (1989-10-01), Wedel
patent: 4905380 (1990-03-01), Eskelinen et al.
patent: 5279049 (1994-01-01), Skaugen et al.
patent: 5515619 (1996-05-01), Kahl et al.
Lindberg Kari
Saarikivi Pekka
Virta Raimo
McKee Michael E.
Valmet Inc.
Wilson Pamela A.
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