Processes for spray dyeing fabrics
View Patent ↗Processes for dyeing fabric are provided. The process can include continuously moving the fabric in a machine direction; removing folds or creases from the fabric; spraying a first surface of the fabric with a dye; and exposing the fabric to atmospheric steam after spraying the dye on the first surface but prior to the dye drying on the first surface so that the dye migrates from the first surface to a second surface of the fabric and reacts with and affixes to a component of the fabric.
1. A process for dyeing fabric, comprising:
continuously moving a tubular fabric in a machine direction, the tubular fabric having an outer surface and an inner surface;
drawing the tubular fabric over a former, the former comprising one of a frame having a substantially planar surface and a substantially tubular frame, to provide a substantially taut surface across the fabric to remove folds or creases, the former opening the tubular fabric so that the inner surface is not in contact with itself or the former and dye bounce off is reduced when the tubular fabric is sprayed with dye;
advancing the taut and open tubular fabric horizontally through an interconnected dye station and spraying downwardly relative to the outer surface of the fabric with dye;
advancing the fabric through an interconnected fixation station and exposing the fabric to atmospheric steam after spraying dye on said outer surface but prior to said dye drying on said outer surface so that said dye migrates from said outer surface to the inner surface of the fabric and reacts with and affixes to the fabric;
advancing the fabric through a first interconnected rinsing station, wherein unfixed dye is removed from the fabric by a pressurized water spray rinse; and
extracting the rinse water and any unfixed dye from the fabric.
2. The process as in claim 1 , further comprising adjusting a moisture content of the fabric to a predetermined content after application of said dye, but before exposure to said atmospheric steam.
3. The process as in claim 2 , wherein said predetermined content comprises between about 20% and 80%.
4. The process as in claim 2 , wherein adjusting said moisture content of the fabric comprises applying heat to the fabric in sufficient amount to act as a catalyst to start said dye reacting with and affixing to the fabric.
5. The process as in claim 1 , wherein said rinse water has a pH sufficient to adjusts a pH of the dyed fabric to a pH that is neutral or slightly acidic.
6. The process as in claim 1 , further comprising applying a finishing component to the fabric after exposing the fabric to said atmospheric steam.
7. The process as in claim 6 , wherein said finishing component is selected from the group consisting of a pH adjusting component, a fabric softener, a fragrance, a stain repellant component, a water repellant component, and combinations thereof.
8. The process as in claim 1 , wherein the fabric comprises synthetic fibers, natural fibers, and combinations thereof.
9. The process as in claim 1 , wherein said first and second surfaces have a substantially uniform color.
10. A process for dyeing fabric, comprising:
continuously moving a tubular fabric in a machine direction, the tubular fabric having an outer surface and an inner surface;
opening the tubular fabric by drawing the fabric over a former, the former comprising one of a frame having a substantially planar surface and a substantially tubular frame, to provide a substantially taut surface across the fabric to substantially remove folds or creases, and so that the inner surface is not in contact with itself or the former and dye bounce off is reduced when the tubular fabric is sprayed with dye;
advancing the open taut tubular fabric horizontally through an interconnected dye station and spraying downwardly relative to the outer surface of the fabric with dye while the fabric is open;
advancing the fabric through an interconnected fixation station and exposing the fabric to atmospheric steam after spraying dye on said outer surface but prior to said dye drying on said outer surface so that said dye migrates from said outer surface to the inner surface of the fabric and reacts with and affixes to the fabric;
advancing the fabric through a first interconnected rinsing station, wherein unfixed dye is removed from the fabric by a pressurized water spray rinse; and extracting the rinse water and any unfixed dye from the fabric.
11. The process as in claim 10 , further comprising adjusting a moisture content of the fabric to a predetermined content after application of said dye, but before exposure to said atmospheric steam.
12. The process as in claim 11 , wherein said predetermined content comprises between about 20% and 80%.
13. The process as in claim 11 , wherein said moisture content of the fabric is adjusted while the fabric is open.
14. The process as in claim 13 , further comprising closing the fabric while maintaining the fabric taut before exposing the fabric to atmospheric steam, but after adjusting said moisture content.
15. The process as in claim 11 , wherein adjusting said moisture content of the fabric comprises applying heat to the fabric in sufficient amount to act as a catalyst to start said dye reacting with and affixing to the fabric.
16. The process as in claim 10 , further comprising closing the fabric while maintaining the fabric taut before exposing the fabric to atmospheric steam.
17. The process as in claim 10 , further comprising reopening the fabric after exposing the fabric to said atmospheric steam, but before rinsing unfixed dye from the fabric.
18. The process as in claim 10 , further comprising applying a finishing component to the fabric after exposing the fabric to said atmospheric steam.
19. The process as in claim 18 , wherein said finishing component is selected from the group consisting of a pH adjusting component, a fabric softener, a fragrance, a stain repellant component, a water repellant component, and combinations thereof.
20. The process as in claim 10 , wherein said first and second surfaces have a substantially uniform color.
21. A process for continuously dyeing a tubular fabric having an inner surface and an outer surface, comprising:
opening the tubular fabric by drawing the fabric over a former, the former comprising one of a frame having a substantially planar surface and a substantially tubular frame, and maintaining the fabric substantially taut across the fabric to remove folds or creases, and so that the inner surface is not in contact with itself or the former and dye bounce off is reduced when the tubular fabric is sprayed with dye;
advancing the open taut tubular fabric horizontally through an interconnected dye station and spraying downwardly relative to the outer surface of the open tubular fabric with dye;
closing the tubular fabric;
advancing the tubular fabric through an interconnected fixation station and exposing the closed tubular fabric to atmospheric steam after spraying dye on said outer surface but prior to said dye drying on said outer surface so that said dye migrates from said outer surface to the inner surface of the tubular fabric and reacts with and affixes to the tubular fabric;
advancing the tubular fabric through a first interconnected rinsing station, wherein unfixed dye is removed from the tubular fabric by a pressurized water spray rinse; and
extracting the rinse water and any unfixed dye from the tubular fabric.