Heat transfer roll
AssigneeBeloit Corporation
InventorRobert J. Alheid
Life of this patent
Estimating the term…
Abstract
A rotary hollow shell cylindrical heat transfer roll for either chilling or heating a web has a device therein for controlling a heat transfer liquid to flow as a uniform thin layer stream in heat transfer relation to the inner cylindrical surface of the roll substantially throughout the width and limited to substantially the circumferential length of the area of the outer periphery of the roll over which the web travels. The direction of flow of the heat transfer stream is opposite to the direction of rotation of the roll.
Claims12
A hollow rotary heat transfer roll having a cylindrical heat transfer wall providing an inner cylindrical surface and an outer cylindrical periphery, on a substantial width and limited length circumferential segmental area of which a web is adapted to travel in heat transfer relation, comprising in combination:
- means for circulating a heat transfer liquid through the interior of said roll;
- and means within the roll for controlling the liquid to flow counter to the direction of rotation of the roll and in a substantially uniform and unbroken thin sheet-like layer stream in heat transfer relation to said inner cylindrical surface substantially limited to and constrained to be in alignment with said segmental area on which the web travels;
- whereby heat transfer through said heat transfer wall between the liquid stream and the web is effected with optimum heat transfer efficiency attained with minimum heat transfer liquid flow rate.
A hollow rotary heat transfer roll having a cylindrical heat transfer wall providing an inner cylindrical surface and an outer cylindrical periphery, on a substantial width and limited length circumferential segmental area of which a web is adapted to travel in heat transfer relation, comprising in combination:
- annular end structures carrying said cylindrical heat transfer wall of the roll;
- non-rotary hollow shafts on which said end structures are respectively rotatably mounted;
- means for rotatably driving the roll;
- means within the roll for controlling the liquid to flow counter to the direction of rotation of the roll and in a substantially uniform and unbroken thin sheet-like layer stream in heat transfer relation to said inner cylindrical surface substantially limited to and constrained to be in alignment with said segmented area on which the web travels, said means within the roll comprising:
- a device stationarily supported by said shafts and including means defining a delivery chamber in heat transfer liquid supply communication with a passage through one of said shafts, a slit nozzle in communication with said delivery chamber and initiating said stream substantially in alignment with the offrunning end of said segmental area, means on said device extending from said nozzle to adjacent the onrunning end of said area and defining with said cylindrical surface a heat transfer liquid stream gap, a spent heat transfer liquid receiving chamber communicating with a terminal end of said gap adjacent to said onrunning end of said area, and means effecting communication between said receiving chamber and an outlet passage through the other of said shafts;
- whereby heat transfer through said heat transfer wall between the liquid stream and the web is effected with optimum heat transfer efficiency attained with minimum heat transfer liquid flow rate.
Dependencies are inferred from the claim text.