Electric resistance heating devices – Heating devices – Combined with nonelectric heating means
Utility Patent
2000-01-06
2001-01-02
Ferensic, Denise L. (Department: 3749)
Electric resistance heating devices
Heating devices
Combined with nonelectric heating means
C392S417000, C219S388000, C034S274000, C034S419000, C034S068000
Utility Patent
active
06169848
ABSTRACT:
INTRODUCTION
The present invention is directed to a cross-direction dryer for a machine producing sheet material moving in a machine direction having both gas powered and electric heating portions and more specifically, to a heater for drying moving sheet material such as paper either where uniform moisture content is desired or a recently applied coating to the paper must be dried.
BACKGROUND
Description of Prior Art
Radiant heaters having quartz infrared lamps with tungsten filaments located in the cross-direction of a moving web of paper and which may be individually controlled to provide an even moisture profile are disclosed in U.S. Pat. No. 4,908,956. Here the specific technique of power control of the heat lamps is shown.
For drying paper in general for what is termed called baseline drying gas fired infrared burners have been used. In general, such gas infrared drying systems have not been capable of profile control (that is of providing differential heat from one zone or slice of the paper being produced to another).
Thus it is desired to increase the total infrared density or drying capacity of systems such as above while still maintaining the ability to do all of the foregoing in a compact and efficient manner.
OBJECT AND SUMMARY OF INVENTION
It is therefore a general object of the present invention to provide an improved cross-direction dryer for a machine producing sheet material moving in a machine direction having both gas powered and electric heating portions.
In accordance with the above object there is provide a cross-direction dryer for a machine producing sheet material moving in a machine direction perpendicular to the cross-direction, the sheet material having a moisture content and/or a recently applied coating comprising a plurality of heater units arranged side-by-side supported on a common frame spanning the width of the sheet in the cross-direction, each heater unit having both electric and gas powered heating portions.
The gas powered portions each include a large area burner.
The electric portions each include a plurality of high impedance wires suspended over the burner,
Power supply means supply controllable voltages to the wires to provide different heat outputs for each heater unit.
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Ferensic Denise L.
Flehr Hohbach Test Albritton & Herbert LLP
Impact Systems Inc.
Joyce Andrea M.
Wright Jerry G.
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