Kari K Lindberg

US Patent:

61052779, Aug 22, 2000

Filed:

Jun 18, 1997

Appl. No.:

8/877662

Inventors:

Kari Lindberg - Knoxville TN
Pekka Saarikivi - Raisio, FI
Raimo Virta - Turku, FI

Assignee:

Valmet, Inc. - Charlotte NC

International Classification:

F26B 1308

US Classification:

34456

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.