Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1990-06-06
1991-12-03
Yeung, James C.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34116, 34120, F26B 1102
Patent
active
050689800
ABSTRACT:
A paper web travels together with a support belt over two heatable drying cylinders and a guide roll between the cylinders, which together define a pocket. Vacuum prevails in the pocket upon operation. Above the pocket there is provided a sealing strip support with sealing strips fastened to it. The sealing strips are at the drying cylinders where they enter the pocket, and these strips counter the penetration of air into the pocket. The sealing strip support is moveable in various ways so that the distance between the sealing strips and the cylinder outer surfaces can be enlarged temporarily. The guide roll is hollow, is connectable with a vacuum source and has a perforated roll shell and is free of stationary inserted parts. A separate vacuum source communicates with extra perforations at axial end edge chambers of the guide roll for applying greater vacuum at the edge chambers than over the remainder of the roll.
REFERENCES:
patent: 3461569 (1969-09-01), Kottick
patent: 4441263 (1984-04-01), Vedenpaa
patent: 4876803 (1989-10-01), Wedel
patent: 4905379 (1990-03-01), Wedel
J. M. Voith GmbH
Yeung James C.
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