Cycle for a dishwasher to reduce filming

专利名称：Cycle for a dishwasher to reduce filming发明人：Duane M. Kobos,Kenneth N. Whah,Tony L.

Ellis,Ernst Grunewald,Ralph E. Christman

申请号：US09/236161申请日：19990122公开号：US06138692A公开日：20001031

摘要：A method for operating an automatic dishwasher in a manner to minimize thedeposition of contaminants or filming on the dishes is provided. The present inventioncontemplates that objectionable filming on washed dishes or dishware items may occur ifresidual water left on the dishes at the end of the final drain step is not given a chance todrip off or drain from the dishware. The present invention provides for a drip periodfollowing the final drain step in the dishwashing cycle. The drip period provides anopportunity for gravity assisted draining or \"drip-off\" of residual water from the dishwareitems prior to evaporation such that the minute particles which are suspended in theresidual water are not deposited onto the dishes. During the drip period, rapid

evaporation of residual liquid from the dishware items is prevented. This is accomplished,in part, by keeping a vent aperture in the dishwasher door closed for a predeterminedtime after the final rinse such that the relative humidity remains high in the dishwashertub and by delaying the energization of the heater such that evaporation is notpromoted by the introduction of heat into the dishwasher tub. The present inventionfurther contemplates the use of a purge operation prior to the rinse step wherein a smallamount of liquid is supplied into the dishwasher, briefly recirculated and then discharged

to drain. The combination of the purge operation with a drip period after the final drainminimizes filming on the dishware items within the dishwasher.

申请人：WHIRLPOOL CORPORATION

代理人：Joel M. Van Winkle,Robert O. Rice,Stephen D. Krefman

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