Method of washing textile articles

Abstract

The present invention relates to a method of washing textile articles that can be carried out, for example, in a continuous batch tunnel washer. Embodiments of the present method can include treating the textile with an aqueous composition including cleaning agent and halogen-containing bleaching agent for a time sufficient to remove soil from the textile and contacting the halogen-treated textile with an aqueous composition including a peroxycarboxylic acid. The concentration of halogen after the sufficient time can be at a level that does not result in adverse interaction between the halogen-containing bleaching agent and the peroxycarboxylic acid. Embodiments of the present method can clean textiles with the results of more effective stain removal and less waste through destruction of the textile article. Further, the present invention can clean a textile contacted soiled by a composition including chlorhexidine gluconate without resulting staining of the textile, which staining could have been permanent.

Claims

1. A method of cleaning textile articles, comprising: placing a plurality of textile articles into a washer having a plurality of sectors including at least a washing sector, a bleaching sector, and a peroxycarboxylic acid sector, wherein the plurality of textile articles move through the washer in a first direction and any fluid in the washer moves counter to the movement of the textiles such that the peroxycarboxylic acid sector is in fluid communication with the bleaching sector and the bleaching sector is in fluid communication with the washing sector; washing the plurality of textile articles in the washing sector with an alkaline detergent; adding to the bleaching sector a first composition comprising a bleaching agent, wherein the first composition is free of peroxycarboxylic acid; treating the plurality of textile articles in the bleaching sector with the first composition at a temperature of 130° F. to 160° F., wherein the bleaching sector has a pH of 9.5 to 11.5; adding to the peroxycarboxylic acid sector a second composition comprising less than 100 ppm of peroxycarboxylic acid; and treating the plurality of textile articles in the peroxycarboxylic acid sector with the second composition at an acidic pH, wherein the textile articles are not rinsed in between treating with the first composition and treating with the second composition.

2. The method of claim 1, wherein the bleaching agent is a halogen-containing bleaching agent.

3. The method of claim 1, wherein the bleaching agent is hydrogen peroxide.

4. The method of claim 1, wherein the method removes chlorhexidine gluconate without leaving a permanent stain in at least selected textiles where chlorhexidine gluconate is present.

5. The method of claim 1, wherein the plurality of textiles are treated in the washing sector with a cleaning agent for a treatment time sufficient to remove soil from the textile.

6. The method of claim 2, wherein the bleaching agent is present in the bleaching sector at an initial concentration from about 50 ppm to about 100 ppm.

7. The method of claim 6, wherein the plurality of textiles are treated in the bleaching sector for a treatment time sufficient to reduce the concentration of bleaching agent to less than 50 ppm.

8. The method of claim 1, wherein the bleaching agent has a first concentration and a second concentration such that the first concentration is greater than the second concentration.

9. The method of claim 8, wherein the first concentration is from about 50 ppm to about 100 ppm and the second concentration is from about 50 ppm to about 10 ppm.

10. The method of claim 9, wherein the second concentration is less than 30 ppm.

11. The method of claim 1, wherein the peroxycarboxylic acid agent is present in a concentration from about 60 ppm to about 100 ppm.

12. The method of claim 1, wherein the washing method is carried out in a tunnel washer.

13. A method of cleaning textile articles, comprising: placing a plurality of textile articles into a continuous washer having an intake, a discharge, an interior located between the intake and the discharge, and a washing fluid located in the interior, wherein the textile articles move in a first direction from the intake to the discharge and the washing fluid moves in a second direction from the discharge to the intake; adding an alkaline cleaning composition to the washing fluid at a first location; treating the textile articles with the alkaline cleaning composition; adding a bleaching composition to the washing fluid at a second location, the bleaching composition comprising a bleaching agent, wherein the bleaching composition is free of peroxycarboxylic acid, the pH of the washing fluid at the second location is from about 9.5 to about 11.5, and the temperature of the washing fluid is from 130° F. to 160° F.; treating the textile articles with the bleaching agent; adding a peroxycarboxylic acid composition to the washing fluid at a third location, the peroxycarboxylic acid composition comprising less than 100 ppm of a peroxycarboxylic acid, wherein the pH of the washing fluid at the third location is acidic; and treating the textile articles with the peroxycarboxylic acid composition, wherein the textile articles are not rinsed in between treating with the bleaching agent and treating with the peroxycarboxylic acid composition and the first, second, and third locations are each a different location in the continuous washer.

14. The method of claim 13, wherein the bleaching agent is a halogen-containing bleaching agent.

15. The method of claim 13, wherein the bleaching agent is hydrogen peroxide.

16. The method of claim 13, wherein the method removes chlorhexidine gluconate without leaving a permanent stain in at least selected textiles where chlorhexidine gluconate is present.

17. The method of claim 13, wherein the bleaching agent is present at an initial concentration from about 50 ppm to about 100 ppm.

18. The method of claim 13, wherein the plurality of textiles are treated for a treatment time sufficient to reduce the concentration of bleaching agent to less than 50 ppm.

19. The method of claim 13, wherein the bleaching agent has a first concentration and a second concentration such that the first concentration is greater than the second concentration.

20. The method of claim 19, wherein the first concentration is from about 50 ppm to about 100 ppm and the second concentration is from about 50 ppm to about 10 ppm.

21. The method of claim 20, wherein the second concentration is less than 30 ppm.

22. The method of claim 13, wherein the peroxycarboxylic acid agent is present in a concentration from about 60 ppm to about 100 ppm.

Description

EXAMPLES

(1) Embodiments of the present method were subjected to extensive testing—16 weeks in four commercial tunnel washers. Textiles were washed in a wash liquor including 50 to 100 ppm chlorine followed by sanitizing with a composition including 70 to 90 ppm peroxyacetic acid in water. In certain tests, up to 120 ppm chlorine was used on articles with certain stains or soil exposure. The following results were obtained:

(2) TABLE-US-00001 Textile Disposed of as Rag CBW Wash Process With Method of the Present Conventional Chemistry Invention Site (16 week rolling average) (Range) 1 0.010 0.004 to 0.010 2 0.014 0.005 to 0.016 3 0.015 0.005 to 0.035 4 0.07 0.07 to 0.14

(3) TABLE-US-00002 Percentage of Items that Required Rewashing CBW Wash Process With Method of the Present Conventional Chemistry Invention Site (16 week rolling average) (Range) 1 2.8 0.7 to 1.5 2 2.4 1.0 to 2.3 3 2.4 0.9 to 2.0 4 8.1 3.0 to 7.0

(4) The conventional chemistry employed in the CBW wash process was used conventional bleaching and washing chemistries, not the inventive halogen followed by peroxycarboxylic acid.

(5) The standard for determining whether a textile should be disposed of as rag was a presence of a visual discoloration on the textile article that is from a source other than manufacturing.

(6) The standard for determining whether a textile should be rewashed was whether the stain could be removed by treating with more concentrated chemistry.

(7) It should be noted that, as used in this specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. Thus, for example, reference to a composition containing “a compound” includes a mixture of two or more compounds. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.

(8) It should also be noted that, as used in this specification and the appended claims, the term “configured” describes a system, apparatus, or other structure that is constructed or configured to perform a particular task or adopt a particular configuration. The term “configured” can be used interchangeably with other similar phrases such as arranged and configured, constructed and arranged, adapted and configured, adapted, constructed, manufactured and arranged, and the like.

(9) All publications and patent applications in this specification are indicative of the level of ordinary skill in the art to which this invention pertains.

(10) The invention has been described with reference to various specific and preferred embodiments and techniques. However, it should be understood that many variations and modifications may be made while remaining within the spirit and scope of the invention.