Boundary air layer modification structure for heat transfer roll

Details Boundary air layer modification structure for heat transfer roll Boundary air layer modification structure for heat transfer roll

1982-05-14

1984-10-16

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34120, 34122, 34152, F26B 1308

Patent

active

044766360

ABSTRACT:
The invention relates to a simple mechanical system to effect removal, reduction or change in composition of boundary layered atmosphere associated with web passage around a heat transfer roll. In effect, the purpose of the invention is to eliminate the layer of air between the web and the heat transfer roll, or to eliminate as much air as possible so that better and more intimate contact is achieved between the web and the heat transfer roll, or to change the pressure and composition of the atmosphere, thus assuring higher efficiency of heat transfer from the roll to the web. The mechanical structure can involve a squeeze roll positioned between the heat transfer roll, squeezing the boundary layer of air attached to the web out prior to web contact to the heat transfer roll. In addition, the squeeze roll could utilize some type of vacuum associated with it. The invention further contemplates reducing the temperature of the boundary layer of air by cooling it and by utilizing stationary boundary layer removal bars and/or squeeze rolls. A squeeze roll is preferably of rubber or plastic with a softer surface so that it makes intimate contact with the heat transfer roll and is driven by contact therewith.

REFERENCES:
patent: 638993 (1899-12-01), Schrader et al.
patent: 3505701 (1970-04-01), Keil
patent: 4202113 (1980-05-01), Kankaanpaa
patent: 4263724 (1981-04-01), Vits

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