Process and apparatus for drying a fibrous web in a single-felt

Details Process and apparatus for drying a fibrous web in a single-felt Process and apparatus for drying a fibrous web in a single-felt

1995-05-15

1996-12-03

Sollecito, John M.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34115, 34117, F26B 300, F26B 1102, D06F 5800

Patent

active

055795897

ABSTRACT:
Apparatus and method for drying a fibrous web. The apparatus comprises a plurality of drying cylinders arranged in groups from a first group to a last group, the web passing sequentially from the first group to the last group, each group having a single felt, the drying cylinders having vacuum transfer rolls arranged therebetween for guiding the fibrous web from one drying cylinder to the next drying cylinder, the vacuum transfer rolls being coupled to a vacuum source by a vacuum duct system, the duct system providing vacuum to the vacuum transfer rolls such that the vacuum level decreases from the first group to the last group. The vacuum level is preferably below about 1500 Pa, and in particular, in the range of about 100 to 1000 Pa.

REFERENCES:
patent: 4359828 (1982-11-01), Thomas
patent: 4876803 (1989-10-01), Wedel
patent: 5163236 (1992-11-01), Heikkila
patent: 5241760 (1993-09-01), Wedel
patent: 5279079 (1994-01-01), Skaugen et al.
patent: 5371954 (1994-12-01), Pinter et al.

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