Non-aqueous washing machine and methods

• US 7,534,304 B2
• Filed: 10/31/2003
• Issued: 05/19/2009
• Est. Priority Date: 04/29/1997
• Status: Expired due to Fees

• Current Assignee: Whirlpool Corporation
• Original Assignee: Whirlpool Corporation
• Inventors: Dalton, Michael T., Krumbein, Holli, Estes, Kurt, Maki, Kenyata Joi, Brown-Green, Cinnamon S., Wright, Tremitchell, Luckman, Joel A., McAllister, Karl David, Conrad, Daniel C., Lau, Brooke Lindsay-Steel, Leitert, Andrew J., Kovich, Mark B., Wyatt-Smith, Vicki Lyn
• Primary Examiner(s): Webb; Gregory E
• Application Number:
  US10/699,262
• Publication Number:
  US 20040117919A1
• Time in Patent Office: 2,027 Days
• Field of Search: 134/10, 134/11, 134/12, 510/284, 510/285, 814/2
• US Class Current: 134/10
• 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 1/08 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

The invention relates to a non-aqueous washing machine, methods of using the machine, methods of washing, and recycling.

Claims

1. A method of cleaning comprising the steps of:

selecting a wash liquor comprising;

a non-aqueous working fluid and at least one washing adjuvant;

bringing said working fluid in contact with the fabric in an automatic washing machine;

applying mechanical energy to provide relative movement within said fabric in the automatic washing machine;

wherein the non-aqueous working fluid is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid; and

wherein the at least one washing adjuvant is selected from the group of;

surfactants, enzymes,-bleaches, fragrances, antistatic agents, and mixtures thereof.

2. The method of claim 1 wherein said non-reactive, non-aqueous, non-oleophilic, apolar working fluid under standard conditions is further characterized by:

a KB value less than approximately 30;

a surface tension less than approximately 35 dynes/cm²; and

a solubility in water less than 10%.

3. The method of claim 1 in which substantially all materials that comprise the automatic washing machine in contact with said working fluid are selected from a group of non-spark generating materials.

4. The method of claim 1 in which the substantially all of the materials that comprise the automatic washing machine contacted by said working fluid are conductive polymers.

5. The method of claim 1 wherein said mechanical energy occurs in a chamber which confines said working fluid and fabric in the automatic washing machine.

6. The method of claim 1 including a further step of detecting the level of said working fluid in contact with the fabric.

7. The method of claim 1 including a further step of sensing the initial moisture content of the fabric.

8. The method of claim 7 wherein the sensing step is carried out by sensing the humidity of the fabric to be cleaned.

9. The method of claim 7 wherein the sensing step is carried out by sensing the conductivity of the fabric.

10. The method of claim 7 wherein the sensing step is carried out by sensing the humidity of the air.

11. The method of claim 7 wherein the sensing step is carried out inside the chamber.

12. The method of claim 1 wherein the temperature inside the chamber is sensed and adjusted to ensure that the temperature does not exceed 30°

F. below the flash point of said working fluid unless the concentration of said working fluid does not exceed its lower flammability limit.

13. The method of claim 1 wherein the washing adjuvant comprises surfactant.

14. The method of claim 13 wherein a preferred surfactant for the system will have a hydrophilic-lipophilic balance from approximately 3 to 14.

15. The method of claim 1, further comprising:

separating said working fluid from the fabric;

cooling the working fluid for decreasing the dissolved soils in the working fluid; and

filtering said working fluid to produce a permeate.

16. The method of claim 15 wherein said non-reactive, non-aqueous, non-oleophilic, apolar working fluid under standard conditions is further characterized by:

a KB value less than approximately 30;

a surface tension less than approximately 35 dynes/cm²; and

a solubility in water less than 10%.

17. The method of claim 15 including a further step of filtering the permeate through a hydrophobic filter.

18. The method of claim 17 including a further step of filtering the permeate through a ceramic filter.

19. The method of claim 15 wherein vapors from said working fluid are treated by a high speed spinning disc which removes said working fluid and water vapor from the air stream.

20. The method of claim 19 including the step of cooling the vapor contacted by the spinning disc.

21. The method of claim 15 wherein said working fluid may have impurities of not more than approximately 20%.

22. The method of claim 1, further comprising applying ultraviolet radiation to the fabric.

23. The method of claim 22 wherein the at least one wash adjuvant is a surfactant and the surfactant for the system has a hydrophilic-lipophilic balance from approximately 3 to 14.

24. A method of cleaning comprising the steps of:

contacting a fabric with a wash liquor in an automatic washing machine, the wash liquor comprising;

a non-aqueous working fluid, water, and a washing adjuvant;

applying mechanical energy to provide relative movement within said fabric in the automatic washing machine;

wherein the non-aqueous working fluid is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid; and

wherein the washing adjuvant is selected from the group of;

surfactants, enzymes, bleaches, fragrances, and mixtures thereof.

25. The method of claim 24 including the step of introducing a water-in-working fluid emulsion to the chamber which confines the fabric and said working fluid.

26. The method of claim 24 wherein the non-reactive, non-aqueous, non-oleophilic, apolar working fluid under standard conditions is further characterized by:

a KB value less than about 30;

a surface tension less than about 35 dynes/cm^2;

and a solubility in water less than about 10%.

27. The method of claim 24 in which substantially all materials that comprise the automatic washing machine in contact with the working fluid are selected from a group of non-spark generating materials.

28. The method of claim 24, further comprising:

separating the working fluid from the fabric;

cooling the working fluid for decreasing the dissolved soils in the working fluid; and

filtering the working fluid to produce a permeate,

wherein the working fluid has impurities of not more than about 20%.

29. A method of cleaning comprising the steps of:

contacting a fabric with a wash liquor in an automatic washing machine, the wash liquor comprising a working fluid and a washing adjuvant;

applying mechanical energy to provide relative movement within said fabric in the automatic washing machine;

wherein the working fluid is a substantially non-reactive, non-aqueous, non-oleophilic, apolar working fluid;

wherein the wash liquor is substantially free of an organic co-solvent; and

wherein the washing adjuvant is selected from the group of;

surfactants, enzymes, bleaches, fragrances, antistatic agents, and mixtures thereof.

30. The method of claim 29 wherein at least one dispensing chamber is provided and the at least one washing adjuvant is added to said chamber.

31. The method of claim 29 including a further step of introducing a water-in-working fluid emulsion into the adjuvant-dispensing chamber.

32. The method of claim 29 including a further step of introducing a water-in-working fluid emulsion to the fabric prior to bringing the working fluid in contact with the fabric.

33. The method of claim 29 wherein the non-reactive, non-aqueous, non-oleophilic, apolar working fluid under standard conditions is further characterized by:

a KB value less than about 30;

a surface tension less than about 35 dynes/cm²; and

a solubility in water less than about 10%.

34. The method of claim 29 in which substantially all materials that comprise the automatic washing machine in contact with said working fluid are selected from a group of non-spark generating materials.

35. A method of claim 29, further comprising:

separating the working fluid from the fabric;

cooling the working fluid for decreasing the dissolved soils in the working fluid; and

filtering the working fluid to produce a permeate, wherein the working fluid may have impurities of not more than about 20%.

36. A method of cleaning comprising the steps of:

contacting a fabric with a wash liquor in an automatic washing machine, the wash liquor comprising;

a non-aqueous, non-reactive, non-oleophilic, apolar working fluid under standard conditions is further characterized by;

a KB value less than about 30;

a surface tension less than about 35 dynes/cm²; and

a solubility in water less than about 10%;

water;

an adjuvant; and

applying mechanical energy to provide relative movement within the fabric in the automatic washing machine.

37. The method of claim 36, wherein the washing adjuvant is selected from the group of:

surfactants, enzymes, bleaches, fragrances, antistatic agents, and mixtures thereof.

38. The method of claim 36 wherein the adjuvant comprises surfactant in the form of an emulsion.

39. The method of claim 36, wherein the method further comprises applying ultraviolet radiation to the fabric.

40. The method of claim 36, further comprising:

separating said working fluid from the fabric;

cooling the working fluid for decreasing the dissolved soils in the working fluid; and

filtering said working fluid to produce a permeate,

wherein the substantially non-aqueous, non-reactive, non-oleophilic, apolar working fluid has impurities of not more than about 20%.