Patent ID: 6718991
Filing Date: 2004-04-13
Classification: A47L

Abstract:
An institutional machine dishwashing process comprising:contacting wash liquor having pH of 7 to 11 and article in institutional dishwashing machine; detergent feeding to the wash liquor; establishing detergent concentration of 0.5 to 15 g/l in the wash liquor during main wash cycle; feeding to the wash liquor, independent of the detergent feeding, detergency booster comprising detersive enzyme; establishing predetermined detersive enzyme concentration in the wash liquor during the main wash cycle, the detersive enzyme concentration decreasing after feeding, detergency booster; determining according to an exponential function the amount of decrease in the detersive enzyme concentration; and refeeding to the wash liquor in a surge, independent of the detergent feeding, detergency booster containing the amount of detersive enzyme determined according to the exponential function; wherein refeeding comprises: generating pulses at regular time intervals and decreasing the pulse size with increasing time; so that the curve of time against cumulative pulse size approximates the exponential function; and calculating the amount of detergency booster for refeeding from the cumulative pulse size.