Claims
- 1. A process for scouring, desizing and bleaching cotton griege goods comprising the steps of:
- a. immersing said goods for a time sufficient to achieve commercial brightness but less than about 30 minutes in an aqueous solution having a temperature in the range from 112.degree. to 212.degree. F and consisting of from 3 to 70% by volume hydrogen peroxide, water and sufficient hydroxide to adjust said solution to a pH in the range 2 to 7, said solution being substantially free of heavy metal ions and maintained out of contact with all metals while said goods are immersed therein;
- b. cycling a portion of said solution through a filtration means to remove solid impurities therefrom while maintaining the volume, composition and pH of said solution in contact with said goods substantially the same;
- c. rinsing said goods with water to wash said aqueous solution therefrom; and
- d. drying said goods.
- 2. A process, as claimed in claim 1, wherein said aqueous solution includes 3 to 50% by volume hydrogen peroxide at 160.degree. to 212.degree. F, said goods being immersed therein for less than about 15 minutes.
- 3. A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 160.degree. to 212.degree. F, a pH of 6 to 7, and includes 10 to 50% by volume hydrogen peroxide.
- 4. A process, as claimed in claim 3, wherein said goods are immersed in said solution for less than about 31/2 minutes.
- 5. A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 195.degree. to 212.degree. F, a pH of 2 to 3 and includes 30 to 70% by volume hydrogen peroxide.
- 6. A process, as claimed in claim 5, wherein said goods are immersed in said solution for less than about 7 minutes.
- 7. The process, as claimed in claim 1, wherein said process includes the steps of maintaining said solution in a plurality of containers and successively immersing said goods into the solution in different ones of said containers.
- 8. A process, as claimed in claim 7, wherein the portion of each of said containers in contact with said solution is glass.
- 9. A process, as claimed in claim 1, wherein said hydrogen peroxide is electronic grade.
- 10. A process as claimed in claim 1, wherein said water of said solution is selected from the group consisting of deionized and distilled water.
- 11. A process, as claimed in claim 1, wherein said solution further includes a fluorescent whitener.
- 12. A process as claimed in claim 1, wherein said process is continuous and said cycling is continuous.
- 13. A process, as claimed in claim 1, wherein said simultaneous scouring, desizing and bleaching is accomplished by immersing said goods in a single tank containing said solution and said cycled portion of said solution is continuously purified to remove contaminants therefrom.
- 14. A process, as claimed in claim 1, including the step of immersing said goods in water for up to 31/2 minutes prior to immersing said goods in said hydrogen peroxide solution, said water having a temperature from just above ambient to 212.degree. F and being substantially free of heavy metal ions and maintained out of contact with all metals while said goods are immersed therein.
- 15. A process, as claimed in claim 14, wherein said water temperature is in the range 104.degree. to 212.degree. F.
- 16. A process, as claimed in claim 1, including the step of immersing said goods in an alkaline scour solution for from 5 seconds to 31/2 minutes prior to immersing said goods in said hydrogen peroxide solution, said alkaline scour solution having a temperature in the range 160.degree. - 212.degree. F and a pH from 10 to 14.
- 17. A process, as claimed in claim 16, wherein said goods are immersed in said alkaline scour solution for from 1 to 3 minutes.
- 18. A process, as claimed in claim 17, wherein said alkaline scour solution is in the range 11.8 to 13.5.
- 19. A process, as claimed in claim 18, wherein said alkaline scour solution temperature is in the range 185.degree. to 212.degree. F.
- 20. A process, as claimed in claim 16, wherein said alkaline scour solution contains 1 to 10% by volume hydrogen peroxide therein.
- 21. A process, as claimed in claim 16, wherein a portion of said alkaline scour solution is cycled through a purification means to remove impurities therefrom while maintaining the volume, composition and pH of said alkaline scour solution in contact with said goods substantially the same.
- 22. A process, as claimed in claim 16, including the step of immersing said goods in an acid solution for from 1 to 10 seconds prior to immersing said goods in said hydrogen peroxide solution, said acid solution having a temperature in the range 45.degree. to 212.degree. F and a pH less than about 3.
- 23. A process, as claimed in claim 22, wherein said acid solution pH is 0.5 to 1.
- 24. A process, as claimed in claim 22, wherein said solution temperature is in the range 45.degree. to 100.degree. F.
- 25. A process, as claimed in claim 22, wherein said goods are immersed in said acid solution for from 1 to 5 seconds.
- 26. A process, as claimed in claim 22, wherein a portion of said acid solution is cycled through a purification means to remove impurities therefrom while maintaining the volume, composition and pH of said acid solution in contact with said goods substantially the same.
- 27. A process, as claimed in claim 22, wherein said goods are immersed in said acid solution prior to being immersed in said alkaline scour solution.
- 28. A process, as claimed in claim 22, wherein said goods are immersed in said alkaline scour solution prior to being immersed in said acid solution.
- 29. A process, as claimed in claim 1, wherein said aqueous solution has a temperature in the range 100.degree. to 150.degree. F, a pH of 6.0 to 7, and includes 30 to 70% by volume hydrogen peroxide.
- 30. A process, as claimed in claim 29, wherein said aqueous solution includes 40 to 70% by volume hydrogen peroxide.
- 31. A process, as claimed in claim 29, wherein said solution temperature is above about 120.degree. F.
- 32. A process, as claimed in claim 15, wherein said immersion time in said hydrogen peroxide solution does not exceed 31/2 minutes.
Parent Case Info
This is a continuation-in-part of my presently co-pending application Ser. No. 312,637, filed Dec. 6, 1972 and now U.S. Pat No. 3,918,898.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
466,112 |
May 1937 |
UK |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
312637 |
Dec 1972 |
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