Method and system for reducing auto-dosing fluctuation of an automatic cleaning machine

Patent metadata

Field	Value
Publication number	US-11352733-B2
Application number	US-202016952890-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Jul 27, 2017
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A method for reducing auto-dosing fluctuation of a washing machine equipped with an automatic dosing device, by using a liquid detergent with a relatively low high-shear viscosity. A cleaning system including a washing machine equipped with an auto-dosing device, in combination with a liquid detergent characterized by a relative low high-shear viscosity.

First claim

What is claimed is:

1. A method of treating an article with an automatic cleaning machine where auto-dosing fluctuation is reduced, the method comprising the steps of:
a. providing a liquid detergent composition, which is characterized by:
i. a total surfactant level of at least about 25 wt %, by total weight of said liquid detergent composition; and
a high-shear viscosity ranging from about 10 mPa·s to about 300 mPa·s when measured at 20° C. at a relatively high shear rate of 20 s −1 ;

b. using said liquid detergent composition in an automatic cleaning machine, which comprises:
i. a cleaning chamber for receiving an article for cleaning; and
ii. a liquid detergent dispenser fluidly coupled to the cleaning chamber, wherein said liquid detergent dispenser comprises a bulk cartridge for storing multiple doses of said liquid detergent composition and an automatic dosing device for automatically dispensing a single dose of said liquid detergent composition from said bulk cartridge into the cleaning chamber during a cleaning cycle, wherein said automatic dosing device, when operating, is characterized by an operating flow rate ranging from about 0.1 ml/second to about 10 ml/second and an operating shear rate ranging from about 10 s −1 to about 250 s −1 .

2. The method of claim 1 , wherein the operating flow rate of said automatic dosing device ranges from about 0.5 ml/second to about 2 ml/second; wherein the operating shear rate of said automatic dosing device ranges from about 15 s −1 to about 200 s −1 ; wherein the high-shear viscosity of said liquid detergent composition ranges from about 20 to about 300 mPa·s, when measured at 20° C. and 20 s −1 ; and wherein said liquid detergent is further characterized by a low-shear viscosity ranging from about 2,000 mPa·s to about 40,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

3. The method of claim 2 , wherein the operating flow rate of said automatic dosing device ranges from about 0.75 ml/second to about 1.5 ml/second.

4. The method of claim 2 , wherein the operating shear rate of said automatic dosing device ranges from about 50 s −1 to about 150 s −1 .

5. The method of claim 2 , wherein the high-shear viscosity of said liquid detergent composition ranges from about 50 to about 300 mPa·s, when measured at 20° C. and 20 s −1 .

6. The method of claim 2 , wherein the low-shear viscosity of said liquid detergent composition ranges from about 3,000 mPa·s to about 30,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

7. The method of claim 2 , wherein the low-shear viscosity of said liquid detergent composition ranges from about 5000 mPa·s to about 20,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

8. The method of claim 1 , wherein said automatic dosing device is selected from the group consisting of peristaltic pumps, aspirator pumps, gear pumps, siphon or suction pipes, gravity draining devices, and combinations thereof.

9. The method of claim 1 , wherein said liquid detergent composition is further characterized by a low-shear viscosity ranging from about 500 mPa·s to about 50,000 mPa·s when measured at 20° C. at a relatively low shear rate of 0.5 s −1 .

10. The method of claim 1 , wherein the operating flow rate of said automatic dosing device ranges from about 0.75 ml/second to about 1.5 ml/second.

11. The method of claim 1 , wherein the operating shear rate of said automatic dosing device ranges from about 50 s −1 to about 150 s −1 .

12. The method of claim 1 , wherein the high-shear viscosity of said liquid detergent composition ranges from about 50 to about 300 mPa·s, when measured at 20° C. and 20 s −1 .

13. The method of claim 1 , wherein said liquid detergent composition is further characterized by a low-shear viscosity ranging from about 3,000 mPa·s to about 30,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

14. The method of claim 1 , wherein said liquid detergent composition is further characterized by a low-shear viscosity ranging from about 5000 mPa·s to about 20,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

15. A method of treating an article with an automatic cleaning machine where auto-dosing fluctuation is reduced, the method comprising the steps of:
a. providing a liquid detergent composition, which is characterized by:
i. a total surfactant level of at least about 25 wt %, by total weight of said liquid detergent composition; and
ii. a high-shear viscosity ranging from about 10 mPa·s to about 500 mPa·s when measured at 20° C. at a relatively high shear rate of 20 s −1 ;

b. using said liquid detergent composition in an automatic cleaning machine, which comprises:
i. a cleaning chamber for receiving an article for cleaning; and
ii. a liquid detergent dispenser fluidly coupled to the cleaning chamber, wherein said liquid detergent dispenser comprises a bulk cartridge for storing multiple doses of said liquid detergent composition and an automatic dosing device for automatically dispensing a single dose of said liquid detergent composition from said bulk cartridge into the cleaning chamber during a cleaning cycle, wherein said automatic dosing device, when operating, is characterized by an operating flow rate ranging from about 0.1 ml/second to about 10 ml/second and an operating shear rate ranging from about 10 s −1 to about 250 s −1 .

16. The method of claim 15 , wherein the operating flow rate of said automatic dosing device ranges from about 0.5 ml/second to about 2 ml/second; wherein the operating shear rate of said automatic dosing device ranges from about 15 s −1 to about 200 s −1 ; wherein the high-shear viscosity of said liquid detergent composition ranges from about 20 to about 350 mPa·s, when measured at 20° C. and 20 s −1 ; and wherein said liquid detergent is further characterized by a low-shear viscosity ranging from about 2,000 mPa·s to about 40,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

17. The method of claim 16 , wherein the operating flow rate of said automatic dosing device ranges from about 0.75 ml/second to about 1.5 ml/second.

18. The method of claim 16 , wherein the operating shear rate of said automatic dosing device ranges from about 50 s −1 to about 150 s −1 .

19. The method of claim 16 , wherein the high-shear viscosity of said liquid detergent composition ranges from about 50 to about 300 mPa·s, when measured at 20° C. and 20 s −1 .

20. The method of claim 16 , wherein the low-shear viscosity of said liquid detergent composition ranges from about 3,000 mPa·s to about 30,000 mPa·s, when measured at 20° C. and 0.5 s −1 .

Assignees

• Procter & Gamble

Inventors

• Tang Ming
• Yang Xiaolin

Classifications

• D06F39/022 Primary

  in a liquid state (D06F39/024 takes precedence) · CPC title

• C11D1/22

  derived from aromatic compounds · CPC title

• A47L15/4418

  in the form of liquids (A47L15/4409, A47L15/4436, A47L15/4445 take precedence) · CPC title

• C11D17/0008

  aqueous liquid non soap compositions (C11D3/0015, C11D3/3947, C11D3/3956 take precedence) · CPC title

• G05D11/00

  Control of flow ratio (control of chemical or physico-chemical variables, e.g. pH-value, G05D21/00; control of humidity G05D22/00; control of temperature by varying the mixing ratio of two fluids having different temperatures G05D23/13; control of viscosity G05D24/00) · CPC title