Claims
- 1. A chemical process for creating localized ares of color variation in dyed fabric, the process comprising the steps of:
- (a) contacting wet dyed fabric with a pelletized aqueous soluble decolorizing agent comprising an active halogen bleach decolorant capable of chemically altering the dye in the fabric to a colorless state which is introduced into the aqueous environment containing the wet dyed fabric;
- (b) altering the pH of the aqueous environment with a pH modifier to optimize the decolorant effect by adjusting the pH to about 9 to 13; and
- (c) quenching the decolorant with a decolorant neutralizer, resulting in a solubilized decolorant and neutralizer wherein at the conclusion of said process, said pelletized decolorizing agent is substantially dissolved and in solution form.
- 2. The process of claim 1 additionally comprising the step of quenching the active decolorant present in the decolorizing pellet with an active decolorant neutralizer.
- 3. The process of claim 1 wherein the dyed fabric comprises denim.
- 4. The process of claim 1 wherein the dyed fabric comprises indigo dyed denim.
- 5. The process of claim 1 wherein the dyed fabric comprises previously used denim material.
- 6. The decolorized material resulting from the process of claim 1 wherein the material consists of unfinished fabric or finished articles.
- 7. The process of claim 1 wherein the decolorizing agent is added at a rate ranging from about 1/8 lb. to about 5 lbs. of pelletized decolorizing agent per pound of fabric.
- 8. The process of claim 1 wherein the wet dyed fabric is contacted with pelletized decolorizing agent over a period of time ranging from about 1 minute to about 90 minutes.
- 9. The process of claim 2 wherein the decolorant neutralizer used to quench the active decolorant is added at a 1:1 molar concentration with respect to the active decolorant.
- 10. The process of claim 2 wherein quenching of the active decolorant will take place over a time period ranging from about 1 minute to 15 minutes.
- 11. The process of claim 2 wherein quenching of the active decolorant occurs with the simultaneous addition of:
- (a) a major portion of water; and
- (b) an effective amount of active decolorant neutralizer.
- 12. The process of claim 2 wherein quenching occurs through the step-wise addition of:
- (a) of water; and
- (b) an effective amount of active decolorant neutralizer,
- wherein the neutralizer is added after the major portion of water.
- 13. The process of claim 1 additionally comprising the step of desizing the fabric prior to contacting the fabric with the pelletized active agent.
- 14. The process of claim 1 additionally comprising the step of swelling the fabric prior to contacting the fabric with the pelletized active agent.
- 15. The process of claim 1 additionally comprising the step of loading a decolorant neutralizer onto the fabric prior to contacting the fabric with the pelletized decolorizing agent.
- 16. The process of claim 2 additionally comprising the step of applying a scouring agent to the fabric once the active agent had been quenched with a neutralizer.
- 17. The process of claim 2 additionally comprising the step of softening the fabric once the active decolorant has been quenched with a neutralizer.
- 18. The process of claim 2 wherein the decolorant neutralizer comprises an agent selected from the group consisting of sodium thiosulfate, sodium metabisulfate, and sodium hydrosulfite.
- 19. The process of claim 1 wherein the active decolorant is selected from a group consisting of calcium hypochlorite and lithium hypochlorite.
- 20. The process of claim 1 wherein the active decolorant is selected from the group consisting of sodium dichloro-s-triazinetrione dihydrate, potassium dichloro-s-triazinetrione, and sodium dichloro-s-triazinetrione.
- 21. A chemical process for creating color variation in dyed fabric through the chemical decolorization of dye in dyed fabric, the process consisting essentially of the steps of:
- (a) desizing wet dyed fabric with an effective amount of desizing agent;
- (b) extracting excess moisture from the desized dyed fabric;
- (c) contacting wet dyed fabric with a pelletized aqueous soluble halogen bleach decolorizing agent which is introduced into the aqueous environment containing the wet dyed fabric, said decolorizing agent selected from the group consisting of a chlorine compound, a bromine compound, or mixtures thereof capable of chemically altering the dye in the fabric to a colorless state wherein at the conclusion of said process, said pelletized decolorizing agent is substantially dissolved and in solution form;
- (d) altering the pH of the aqueous environment with a pH modifier to optimize the decolorant effect by adjusting the pH to about 9 to 12;
- (e) quenching the active decolorant present in the decolorizing pellet with a decolorant neutralizer, resulting in a solubilized decolorant and neutralizer;
- (f) rinsing the decolorized fabric; and
- (g) souring the decolorized fabric to remove any discoloration or impurities.
- 22. The process of claim 21 wherein the dyed fabric comprises denim.
- 23. The process of claim 21 wherein the dyed fabric comprises indigo dyed denim.
- 24. The process of claim 21 wherein the dyed fabric comprises previously used denim material.
- 25. The decolorized material resulting from the process of claim 21 wherein the material consists of unfinished fabric or finished articles.
- 26. The process of claim 21 wherein the decolorizing agent is added at a rate ranging from about 1/8 lb. to about 5 lbs. of pelletized decolorizing agent per pound of fabric.
- 27. The process of claim 21 wherein the wet dyed fabric is contacted with pelletized decolorizing agent over a period of time ranging from about 1 minute to about 90 minutes.
- 28. The process of claim 21 wherein the active decolorant neutralizer used to quench the active decolorant is added at a 1:1 molar concentration with respect to the active decolorant.
- 29. The process of claim 21 wherein quenching of the active decolorant will take place over a time period ranging from about 1 minute to 15 minutes.
- 30. The process of claim 21 wherein quenching of the active decolorant occurs with the simultaneous addition of:
- (a) a major portion of water; and
- (b) an effective amount of active decolorant neutralizer.
- 31. The process of claim 21 wherein quenching occurs through the step-wise addition of:
- (a) a major portion of water; and
- (b) an effective amount of active decolorant neutralizer,
- wherein the neutralizer is added after the major portion of water.
- 32. The process of claim 21 additionally comprising the step of swelling the fabric prior to contacting the fabric with the pelletized active agent.
- 33. The process of claim 21 additionally comprising the step of loading a decolorant neutralizer onto the fabric prior to contacting the fabric with the pelletized decolorizing agent.
- 34. The process of claim 21 additionally comprising the step of softening the fabric once the active decolorant has been quenched with a neutralizer.
- 35. The process of claim 21 wherein the decolorant neutralizer comprises an agent selected from the group consisting of sodium thiosulfate, sodium metabisulfate, and sodium hydrosulfite.
- 36. The process of claim 21 wherein the active decolorant is selected from a group consisting of calcium hypochlorite and lithium hypochlorite.
- 37. The process of claim 21 wherein the active decolorant is the active decolorant being selected from the group consisting of sodium dichloro-s-triazinetrione dihydrate, potassium dichloro-s-triazinetrione, and sodium dichloro-s-triazinetrione.
Parent Case Info
This is a division of application Ser. No. 07/321,969, filed Mar. 10, 1989, now U.S. Pat No. 4,997,450.
US Referenced Citations (6)
Non-Patent Literature Citations (2)
Entry |
CA 105 (2):11813 e. |
Calculations of Analytical Chemistry, Fifth Edition, 1954, L. F. Hamilton et al. |
Divisions (1)
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Number |
Date |
Country |
Parent |
321969 |
Mar 1989 |
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