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Solution dyeing, also known as dope or spun dyeing, is the process of adding pigments or insoluble dyes to the spinning solution before the solution is extruded through the spinneret. Only manufactured fibers can be solution dyed.
The dope dyeing applies to synthetic fiber only. This method of dyeing is also known as solution dyeing [10] and 'mass coloration' or 'mass colored'. It has limited color options. [11] [12] Fiber dyeing: In fiber dyeing, the dyeing takes place at the fiber stage before they are spun into yarn. It is also called stock dyeing.
During the dyeing process, the dye must become close and even with the material in order to produce a uniform color that is fast to moisture, heat, and light. [5] Due to their superior fastness properties and simple application, reactive dyes are currently the most common type of dye for cotton dyeing. [6] The CPB technique uses less water and ...
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.
Although almost all dyeing can be done in a vat, the term vat dye is used to describe a chemical class of dyes that are applied to cellulosic fibre (i.e., cotton) using a redox reaction as described below. Because of the use of caustic soda, and the very high pH of the dye bath in the dyeing process, wool cannot be dyed using vat dyestuffs.
The route using zinc powder is a two-step process: 2 SO 2 + Zn → ZnS 2 O 4 ZnS 2 O 4 + 2 NaOH → Na 2 S 2 O 4 + Zn(OH) 2. The sodium borohydride method obeys the following stoichiometry: NaBH 4 + 8 NaOH + 8 SO 2 → 4 Na 2 S 2 O 4 + NaBO 2 + 6 H 2 O. Each equivalent of H − reduces two equivalents of sulfur dioxide. Formate has also been ...
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Cudbear is one of the few natural dyes to be credited to a named individual, Dr Cuthbert Gordon of Scotland, who patented the process of its production in 1758. [8] cutch Cutch is an ancient brown dye from the wood of acacia trees, particularly Acacia catechu, used in India for dyeing cotton. Cutch gives gray-browns with an iron mordant and ...