Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1993-04-23
1994-03-08
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34117, 34120, 162206, F26B 700
Patent
active
052916669
ABSTRACT:
An apparatus for drying a web of roll material has two rows of comparatively low and high temperature cylinders, and a metal belt and a felt belt entrained in parallel for transporting the web on a serpentine path around the cylinders. The metal belt is pre-heated at an input side to each low temperature cylinder to a temperature from 140.degree. C. to 170.degree. C. An input press roll applies a nip pressure to the metal belt against the web, felt belt, and low temperature cylinder from 60 to 200 pli (pounds per linear inch). The surface of the low temperature cylinder is heated to an intermediate temperature from 100.degree. C. to 140.degree. C. The temperature of the heated belt at an input side is maintained only about 20.degree. C. higher than that of the low temperature cylinder. The low temperature cylinder has air pressure grooves for maintaining a negative air pressure in the range of 0.1 to 0.7 bar at its surface for lowering the vapor pressure for water evaporated from the web. A uniform drying and densification of the web is obtained, without excessive buildup of web pressure or breaking or delamination of the web.
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Babinsky Vladislva A.
Mumford Warren G.
Bennet Henry A.
Gromada Denise
International Paper Company
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