Non-aqueous washing apparatus and method

• US 8,262,741 B2
• Filed: 11/19/2008
• Issued: 09/11/2012
• Est. Priority Date: 04/29/1997
• Status: Expired due to Fees

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Estes, Kurt A., Conrad, Daniel C., Wright, Tremitchell L., Kovich, Mark Bradley
• Primary Examiner(s): Webb, Gregory E
• Application Number:
  US12/273,635
• Publication Number:
  US 20090069209A1
• Time in Patent Office: 1,392 Days
• Field of Search: 814/2, 510/285, 134/34
• US Class Current: 8/142
• CPC Class Codes: C11D 2111/44 Multi-step processes
• CPC Class Codes: D06F 43/00 Dry-cleaning apparatus or methods using volatile solvents D06F9/00 - D06F41/00 take precedence
• CPC Class Codes: D06F 43/007 Dry cleaning methods
• CPC Class Codes: D06L 1/02 using organic solvents
• CPC Class Codes: D06L 1/04 combined with specific additives D06L1/06 takes precedence
• CPC Class Codes: D06L 1/08 Multi-step processes
• CPC Class Codes: D06L 4/00 Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs

Abstract

Methods and apparatuses for washing fabric loads without water or using water only as a co-solvent are disclosed. One method of non-aqueous clothes washing includes the steps of disposing clothing in a wash container, delivering a wash liquor to the fabric load, the wash liquor comprising a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid and at least one washing additive, applying mechanical energy to the clothing and wash liquor for a sufficient amount of time to provide fabric cleaning and, thereafter, substantially removing the wash liquor from the fabric load. The working fluid may be selected from the group consisting of perfluorocarbons, hydrofluoroethers, fluorinated hydrocarbons and fluoroinerts.

Claims

1. A method for laundering fabrics comprising the steps of:

disposing a fabric load in a wash chamber of an automatic laundering apparatus;

delivering a non-aqueous wash liquor to the wash chamber containing the fabric load, the non-aqueous wash liquor comprising a working fluid;

applying mechanical energy to provide relative movement between the fabric load and the wash liquor during a wash cycle;

draining the wash liquor from the wash chamber; and

drying the fabric load by removing additional wash liquor from the fabric load via liquid extraction,

wherein the non-aqueous wash liquor is delivered through a spray nozzle while the wash chamber is spinning.

2. The method of claim 1, wherein the working fluid is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid and has a KB value of less than about 30.

3. The method of claim 1, further comprising at least one of heating and cooling the working fluid.

4. The method of claim 1, further comprising delivering a washing additive to the wash chamber.

5. The method of claim 4, wherein the washing additive is selected from the group of:

surfactants, enzymes, bleaches, ozone, ultraviolet light, hydrophobic solvents, hydrophilic solvents, deodorizers, fragrances, antistatic agents and anti-stain agents.

6. A method of laundering fabrics comprising the steps of:

disposing a fabric load in a wash chamber of an automatic laundering apparatus;

delivering a non-aqueous wash liquor and a hydrophilic solvent to the wash chamber;

applying mechanical energy to provide movement of the fabric load during a wash cycle;

draining the non-aqueous wash liquor; and

the hydrophilic solvent from the wash chamber after applying the mechanical energy;

delivering a hydrophobic solvent to the fabric load in the wash chamber after draining the non-aqueous wash liquor and the hydrophilic solvent from the wash chamber; and

drying the fabric load.

7. The method of claim 6, wherein the non-aqueous wash liquor is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid and has a KB value of less than about 30.

8. The method of claim 6, further comprising heating the non-aqueous wash liquor.

9. The method of claim 6, wherein the non-aqueous wash liquor is selected from the group of:

perfluorocarbons, hydrofluoroethers, fluorinated hydrocarbons, fluoroinerts, and mixtures thereof.

10. The method of claim 6, wherein the hydrophilic solvent is selected from the group of alcohols, esters, ethers, ketones, aldehydes, glycols, and mixtures thereof.

11. The method of claim 6, wherein at least one of an aqueous wash liquor, the non-aqueous wash liquor, and the hydrophilic solvent is delivered through a spray nozzle.

12. The method of claim 11, wherein the wash chamber is spinning during delivery through the spray nozzle.

13. The method of claim 12, wherein the fabric load is subjected to a centrifugal force of at least 2G during spinning.

14. The method of claim 6, wherein drying the fabric load comprises forcing air through the fabric load.

15. The method of claim 6, further comprising:

delivering an aqueous wash liquor comprising water and detergent to the wash chamber before draining the non-aqueous wash liquor and the hydrophilic solvent from the wash chamber; and

draining the aqueous wash liquor from the wash chamber,

wherein the step of delivering the hydrophobic solvent to the fabric load in the wash chamber occurs after draining the non-aqueous wash liquor and the hydrophilic solvent from the wash chamber and after draining the aqueous wash liquor from the wash chamber.

31. The method of claim 15, wherein:

the non-aqueous working fluid is selected from the group of;

perfluorocarbons, hydrofluoroethers, fluorinated hydrocarbons, fluoroinerts, and mixtures thereof; and

the hydrophilic solvent is selected from the group of alcohols, esters, ethers, ketones, aldehydes, glycols, and mixtures thereof.

16. A method of laundering fabrics comprising the steps of:

disposing a fabric load in a wash chamber of an automatic laundering apparatus;

delivering a non-aqueous wash liquor and hydrophobic solvent to the wash chamber;

applying mechanical energy to provide movement of the fabric load during a wash cycle;

draining the non-aqueous wash liquor and the hydrophobic solvent from the wash chamber;

delivering a hydrophilic solvent to the fabric load in the wash chamber after draining the non-aqueous wash liquor and the hydrophobic solvent from the wash chamber; and

drying the fabric load.

17. The method of claim 16, wherein the non-aqueous wash liquor is a working fluid that is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid and has a KB value of less than about 30.

18. The method of claim 16, wherein the non-aqueous wash liquor is selected from the group of:

perfluorocarbons, hydrofluoroethers, fluorinated hydrocarbons, fluoroinerts, and mixtures thereof.

19. The method of claim 16, further comprising heating the non-aqueous wash liquor.

20. The method of claim 16, wherein at least one of the non-aqueous wash liquor and hydrophobic solvent is delivered through a spray nozzle.

21. The method of claim 20, wherein the wash chamber is spinning during delivery through the spray nozzle.

22. The method of claim 16, wherein the fabric load is subjected to a centrifugal force of at least 2G during spinning.

23. The method of claim 16, wherein drying the fabric load comprises forcing air through the fabric load.

24. The method of claim 16, wherein drying the fabric load comprises removing additional wash liquor from the fabric load by liquid extraction.

25. The method of claim 16, further comprising draining the hydrophilic solvent from the wash chamber to facilitate faster drying.

26. The method of claim 16, wherein the hydrophilic solvent is selected from the group of alcohols, esters, ethers, ketones, aldehydes, glycols, and mixtures thereof.

27. A method of laundering fabrics comprising the steps of:

disposing a fabric load in a wash chamber;

delivering a non-aqueous wash liquor to the wash chamber, the non-aqueous wash liquor comprising a non-aqueous working fluid; and

heating the wash chamber to change the non-aqueous working fluid from a liquid to a vapor and contacting the fabric load with the vapor of the non-aqueous working fluid.

28. The method of claim 27, further comprising:

condensing the vapor of the non-aqueous working fluid to a liquid; and

recirculating the liquid of the non-aqueous working fluid to the wash chamber.

29. The method of claim 27, wherein the non-aqueous wash liquor is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid and has a KB value of less than about 30.

30. The method of claim 27, wherein the non-aqueous working fluid is selected from the group of:

perfluorocarbons, hydrofluoroethers, fluorinated hydrocarbons, fluoroinerts, and mixtures thereof.