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US 6,718,991 B1Granted
Process and an arrangement for machine dishwashing
AssigneeEcolab GmbH & Co. OHG
InventorsJacques Breyer, Guenter Hellmann, Dieter Hemm, Klaus Wilbert
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Abstract
The process of dishwashing in an institutional dishwashing machine by adding to the wash liquor of the dishwashing machine a low-alkali content detergent composition and adding to a washing tank of the dishwashing machine a detergency booster composition containing an enzyme. Apparatus to practice the process is also disclosed.
Claims18
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.
11 more elements
Dependencies are inferred from the claim text.