US 11,753,766 B2
Indigo dyeing process and apparatus and indigo dyed yarns and fabrics made thereby
Howard Malpass, China Grove, NC (US); Ralph Tharpe, Ronda, NC (US); and M. Dean Ethridge, Lubbock, TX (US)
Assigned to INDIGO MILL DESIGNS, INC., Wilmington, DE (US)
Filed by INDIGO MILL DESIGNS, INC., Ronda, NC (US)
Filed on Jan. 28, 2020, as Appl. No. 16/774,895.
Application 16/774,895 is a division of application No. 15/701,840, filed on Sep. 12, 2017, granted, now 10,619,292.
Claims priority of provisional application 62/393,258, filed on Sep. 12, 2016.
Prior Publication US 2020/0165774 A1, May 28, 2020
Int. Cl. D06P 1/22 (2006.01); D06P 5/02 (2006.01); D06B 23/18 (2006.01); D06B 21/00 (2006.01); D06B 23/16 (2006.01); D06B 23/02 (2006.01); D06B 1/14 (2006.01); D06B 1/02 (2006.01); D06B 19/00 (2006.01); D06B 5/06 (2006.01)
CPC D06P 1/228 (2013.01) [D06B 21/00 (2013.01); D06B 23/02 (2013.01); D06B 23/021 (2013.01); D06B 23/023 (2013.01); D06B 23/16 (2013.01); D06B 23/18 (2013.01); D06P 5/02 (2013.01); D06B 1/02 (2013.01); D06B 1/14 (2013.01); D06B 5/06 (2013.01); D06B 19/0005 (2013.01); D06B 19/0094 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus for indigo dyeing of textile products comprising:
a dye application chamber having an inert and anaerobic atmosphere for receiving an undyed deoxygenated textile product, the dye application chamber having an anaerobic atmosphere and a leuco-indigo dye applicator which applies a leuco-indigo dye solution onto the undyed deoxygenated textile product to form a leuco-indigo dyed textile product;
a purification system to control oxygen content of the inert and anaerobic atmosphere of the dye application chamber; and
roller seal assemblies positioned at least at inlets and outlets of the dye application chamber so as to maintain the inert and anaerobic atmospheres therewithin so that the leuco-indigo dyed textile product is discharged from dye application chamber into an oxygen-containing atmosphere whereby the leuco-indigo dye applied to the textile product is oxidized to thereby form an indigo dyed textile product.