Apparatus for drying paper webs or the like

Details Apparatus for drying paper webs or the like Apparatus for drying paper webs or the like

1978-08-15

1980-04-08

Richter, Sheldon

Heat exchange

Movable heating or cooling surface

Rotary drum

34124, 165133, 432228, F28F 502, F28F 1318

Patent

active

041966899

ABSTRACT:
A Yankee clyinder whose internally heated shell consists of steel or cast iron and is provided with an external layer of pure or alloyed copper, molybdenum, tungsten or another metal whose thermal conductivity greatly exceeds (and preferably amounts to at least twice) the thermal conductivity of the material of the shell. The thickness of the layer is in the range of 0.4-2 millimeters, and the thermal expansion coefficient of its material is identical to or approximates that of the material of the shell. The layer can be applied to the periphery of the shell in molten state in the form of a finely atomized spray. The drying action of such cylinder upon a running paper web greatly exceeds the drying action of a cylinder whose shell consists exclusively of cast iron or steel.

REFERENCES:
patent: 1252319 (1918-01-01), Bradshaw
patent: 2259024 (1941-10-01), Cleveland
patent: 2433121 (1947-12-01), Hornbostel
patent: 2958742 (1960-11-01), Palmer
patent: 2964297 (1960-12-01), Davis et al.
patent: 4081913 (1978-04-01), Salminen

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