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Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product

a cellulosic textile and inert leuco state technology, applied in the direction of dyeing process, textiles, liquid/gas/vapor textile treatment, etc., can solve the problems of inability to dye cellulosic textiles, complex and expensive procedures,

Inactive Publication Date: 2005-11-03
GASTON SYST INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, dyeing cellulosic textile material with indigo dye is a complicated, complex and expensive procedure, because indigo in its natural state will not affix to cellulosic fibers.
As a result, the indigo dyeing is expensive, complicated and inefficient.
Furthermore, because both surfaces are exposed to the same dye bath when the material is immersed in the dye vats, it is practicably impossible to dye a cellulosic fabric, such as cotton denim, with an indigo dye on one surface and another dye of a different shade, color or type on the opposite surface.
Another significant problem with prior art indigo dyeing ranges is that of waste water disposal.
This creates an undesirable substantial expense and environmental problem.

Method used

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  • Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product
  • Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product
  • Method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and dyed product

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[0025] The apparatus 10 of the preferred embodiment of the present invention is illustrated in FIGS. 2, 3 and 4. Referring first to FIG. 2, the apparatus includes a supply container or feed tank 12 containing a supply of indigo dye 14 in a reduced leuco state. Conveniently, this indigo dye 14 can be used in the form received from a supplier, which typically may be a paste of 40% concentration. However, it is to be understood that various concentrations may be used as desired for particular dyeing application. For example, water can be added to reduce the concentration to any other suitable amount, such as 20%. Also, conventional pigments, penetrants and foaming agents can be added to vary the shade or color and to facilitate application. In a typical example, the pigment and penetrant additives may reduce the indigo dye concentration to, for example, 32%.

[0026] To maintain the dye in its leuco state in the feed tank 12, a floating cover 16 is positioned on top of the dye 14 in the ...

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Abstract

Dyeing a cellulosic textile substrate with reduced indigo dye in a leuco state after foaming with an inert gas to maintain the dye isolated from oxidizing substances. Following application of the foam to the substrate, it is exposed to the adjacent atmosphere, with the oxygen in the atmosphere oxidizing the reduced indigo dye to regenerate it and cause it to affix to the textile substrate. A product can be produced using the method and apparatus of the present invention that has different dye characteristics on opposite surfaces of the substrate by applying the indigo dye foam to one surface and another dye, either an indigo dye or some other dye to the opposite surface.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a method and apparatus for dyeing cellulosic textile substrates with an inert leuco state dye and a dyed product. More particularly, the present invention relates to a method and apparatus for dyeing cellulosic textile substrates with a reduced leuco state dye foamed with an inert gas and applied in the leuco foamed state to the textile substrate and oxidized thereon to affix the indigo dye to the cellulosic textile substrate. The present invention also relates to a dyed cellulosic textile product, to one surface of which is dyed by a leuco state dye and the other surface dyed by a dye having a different characteristic in shade, color or type. [0002] Dyeing cellulosic textile material, such as cotton yarn or fabric, with a leuco state dye, such as indigo dye, has a large market, particularly for cotton denim clothing items, such as blue jeans. The fastness of the indigo dye on cotton and the deep color or shade that...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D06B19/00D06L3/00
CPCD06B19/0094D06P1/965D06P1/228D06P1/0016
Inventor AURICH, CHRISTOPH WALTERZEIFFER, DIETER FRIEDRICHNEUPERT, HERMANN A.
Owner GASTON SYST INC
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