Detergent composition and method for warewashing

• US 6,368,420 B1
• Filed: 12/23/1998
• Issued: 04/09/2002
• Est. Priority Date: 01/08/1998
• Status: Expired due to Fees

• Current Assignee: Diversey Incorporated (Sealed Air)
• Original Assignee: Diverseylever Incorporated (Unilever PLC)
• Inventors: Nicholson, John Richard, Angevaare, Petrus Adrianus, Flu, Paul, Schepers, Frederik Jan
• Primary Examiner(s): Gupta, Yogendra N.
• Assistant Examiner(s): Mruk, Brian P.
• Application Number:
  US09/221,635
• Time in Patent Office: 1,203 Days
• Field of Search: 510/197, 510/218, 510/219-221, 510/224-226, 510/228, 510/363, 510/367, 510/370, 510/372, 510/374, 510/375, 510/378-381, 510/392-393, 510/530, 134/25.3, 134/25.5, 134/26, 134/25.2, 134/29
• US Class Current: 134/26
• CPC Class Codes: C11D 3/0084 Antioxidants; Free-radical scavengers
• CPC Class Codes: C11D 3/386 Preparations containing enzymes , e.g. protease or amylase
• CPC Class Codes: C11D 3/39 Organic or inorganic per-compounds
• CPC Class Codes: C11D 3/395 Bleaching agents

Abstract

A chemical cleaning system for a multi-tank or a single-tank mechanical warewashing machine is provided, having at least two separate components for aqueous dissolution or dilution to respective use concentrations, a first component comprising an enzyme or a mixture of an enzyme and a cleaning agent, and a second component comprising a bleach, wherein the first component is introduced into a wash zone or step and wherein the second component is introduced into a post-rinse zone or step.

Claims

1. A cleaning system for a multi-tank or a single-tank mechanical warewashing machine having at least two separate components for aqueous dissolution or dilution to respective use concentrations, a first component comprising an enzyme or a mixture of an enzyme and a cleaning agent, and a second component comprising a bleach, wherein the first component is introduced into a wash zone and wherein the second component is introduced into a post-rinse zone.

2. The system according to claim 1, wherein the bleach of the second component is a halogen bleach and wherein the system comprises a third component being a bleach scavenger, said third component being introduced in a wash zone which is the zone in which the first component is introduced or a zone which is situated between this zone and the post-rinse.

3. The system according to claim 2, wherein the bleach scavenger of the third component is introduced in the last wash zone before the post-rinse.

4. The system according to claim 2, wherein the bleach scavenger of the third component is selected from the group consisting of alkali metal and ammonium salts of sulphur-oxy acids.

5. The system according to claim 2, wherein the use concentration of the bleach scavenger in the wash zone in which said scavenger is introduced is in excess of the concentration of the bleach in said wash zone, said bleach coming from the post-rinse.

6. The system according to claim 1, wherein the enzyme present in the first component is selected from the group consisting of an amylase, a protease, a lipase and mixtures thereof.

7. The system according to claim 6, wherein the enzyme present in the first component is an amylase.

8. A method of warewashing in a multi-tank or single-tank, industrial or institutional machine, comprising the steps of:

(1) formulating at least two separate components of a chemical cleaning system for aqueous dissolution or dilution to respective use concentrations, a first component comprising an enzyme or a mixture of an enzyme and a cleaning agent, and a second component comprising a bleach;

(2) introducing the first component into a wash zone, to clean dirty dishware;

(3) introducing the second component into a post-rinse zone or step to effectively complete the cleaning of the dishware.

9. A method of warewashing in a multi-tank or single-tank, industrial or institutional machine, comprising the steps of:

(1) formulating three components of a chemical cleaning system for aqueous dissolution or dilution to respective use concentrations, a first component comprising an enzyme or a mixture of an enzyme and a cleaning agent, a second component comprising a bleach, and a third component comprising a bleach scavenger agent;

(2) introducing the first component into a wash zone to clean dirty dishware;

(3) introducing the third component containing the bleach scavenger into a wash zone which is the zone in which the first component is introduced, or situated between this zone and the post-rinse zone; and

(4) introducing the second component containing the bleach into the post-rinse zone.

10. A method according to claim 9, wherein the third component containing the bleach scavenger is introduced into the last wash zone before the post-rinse zone.