| 摘要 |
Method and apparatus for uniformly drying a web to obtain a desired moisture content within a predetermined tolerance. A matrix of emitters arranged in m rows and n columns (where m,n>/=2) are operated at either low or high flame conditions. At least one emitter in each column is operated in a duty cycle fashion wherein the said emitter is maintained at the high flame condition for a predetermined portion of the duty cycle and at the low flame condition for the remainder of the duty cycle as a function of the amount of drying desired. This technique yields a finer adjustment than is capable in conventional systems. The high flame condition is selected to operate the emitters at a radiant energy whose wavelength optimizes the drying capability. Air circulators enhance the drying operation and protects the system from damage. Sprayers spray the emitters to prevent damage due to overheating when a web break occurs.
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