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In the exhaust method, the dye is transported to the substrate by the dye liquor's motion. The dye is adsorbed onto the fibre surface and ideally diffuses into the whole of the fibre. Water consumption in exhaust application is higher than the continuous dyeing method. [18] There are three corresponding ways of dyeing with the exhaust method.
Batch dyeing (exhaust dyeing) is a method of dyeing a textile material. The method involves the gradual transfer of dye from a dye bath to the textile material in the same piece of equipment. [1] The various methods of batch dyeing result from the type of machine used in the dyeing process.
This method of dyeing cotton is declining in importance due to the toxic nature of the chemicals used. Sulfur dyes are inexpensive dyes used to dye cotton with dark colors. Dyeing is effected by heating the fabric in a solution of an organic compound, typically a nitrophenol derivative, and sulfide or polysulfide. The organic compound reacts ...
The method exploits the properties of reactive dyes, which are also applicable at room temperature. [4] Cotton can be dyed with a variety of dyes, although reactive dye is the most prevalent. Active groups in these dyes form covalent bonds with cotton's hydroxy groups through substitution and/or addition. The CPB method doesn't use salt or ...
Cationization of cotton enables salt free dyeing and enhances the dyeability of the substrate with anionic dyes such as reactive dyes and direct dyes. Water and salt consumption are one of the major problems in the dyeing especially cotton which leads to substantial environmental impact with extra time and cost. Secondly washing off the ...
Some dyestuffs, such as indigo and lichens, will give good color when used alone; these dyes are called direct dyes or substantive dyes. The majority of plant dyes, however, also require the use of a mordant, a chemical used to "fix" the color in the textile fibres. These dyes are called adjective dyes or "mordant dyes". By using different ...
Colour fastness is a term—used in the dyeing of textile materials—that characterizes a material's colour's resistance to fading or running.Colour fastness is the property of dyes and it is directly proportional to the binding force between photochromic dye and the fibre.
Cross dyeing is "a method of dyeing blend or combination fabrics to two or more shades by the use of dyes with different affinities for the different fibers". [10] The cross dyeing process can be used to create heather effects, and plaid, check, or striped fabrics.
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