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When dyed, the wool yarns are dyed blue, whereas the polyester yarns remain white. Cross dyeing is commonly used with piece or fabric dyed materials. However, the same concept is applicable to yarn and product dyeing. For example, silk fabric embroidered with white yarn can be embroidered prior to dyeing and product dyed when an order is placed.
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.
In the continuous filament industry, polyester or polyamide yarns are always dyed at package form, while viscose rayon yarns are partly dyed at hank form because of technology. [29] The common dyeing process of cotton yarn with reactive dyes at package form is as follows:
Solution dyeing means adding the color pigment earlier in the manufacturing process, when the polyester is just little pellets. Once these pellets are colored, they are melted and turned into fibres, which are then spun into yarn. [ 13 ]
Package Dyeing: This is the most commonly used method. This is when yarn is already spun up in bulk and then lowered into a chamber filled with dye. When the yarn is done absorbing the dye, it is removed from the cylindrical chamber to dry. Skein Dyeing: This is the process of when yarn is laid loosely in skeins or hanks.
The yarn is processed by knitting or weaving, with color and patterns, which turns it into cloth. The machine used for weaving is the loom. For decoration, the process of coloring yarn or the finished material is dyeing. [1] For more information of the various steps, see textile manufacturing
Dyeing is commonly carried out with an anionic direct dye by completely immersing the fabric (or yarn) in an aqueous dye bath according to a prescribed procedure. For improved fastness to washing, rubbing and light, further dyeing methods can be used. These require more complex chemistry during processing, and are thus more expensive to apply.
The processes to make short-staple yarn (typically spun from fibers from 1.9 to 5.1 centimetres (0.75 to 2.0 in)) are blending, opening, carding, pin-drafting, roving, spinning, and—if desired—plying and dyeing. In long staple spinning, the process may start with stretch-break of tow, a continuous "rope" of synthetic fiber.
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