Wednesday, September 21, 2011

Some Dyeing Effects

Learn Apparel Merchandising, Learn Fashion design.
Special Dyeing Effects
Piece dyeing, as described previously, primarily produces a solid color throughout the goods being dyed. It is possible, however, to create effects such as multi-colours or multishades by any yarn-dye or piece-dye method.

Cross Dyeing
Cross dyeing is a type of dyeing in which a yarn, a fabric, or even a garment made with two or more genetic fibres types having different dye affinities is dyed in a single bath containing two different class of dyes. Each class of dye colors only one type of the fibre. Two different colors can be dyed in one bath or either type of fibre may be dyed, leaving the other one white. If different fibres are blended in the same yarn, a stock-dyed effect can be obtained. If yarns of one kind of fibre and yarns of another kind of fibres are used in the warp direction, vertical stripes can be produced after dyeing. A plaid effect can be produced by weaving yarns of different kinds of fibre both in warp and filling directions and then dyeing the fabric in single bath with a mixture of two kinds of dyes. Whereas certain fibre combination allow for one bath process, other fibre combinations may require a two –step dyeing process to produce two colours. Cross dyeing is the more economical and quicker way to produce the same effects obtained by other methods. The effects achieved by expensive stock dyeing method can be replicated easily by this cross dyeing method.

Union Dyeing
Union dyeing is same as like cross dyeing, except that instead of multi color effects, one solid color is produced. The dyer accomplishes this by using two or more classes of dye, each of the same color. For example, a fabric composed of rayon and acetate can be dyed by a solid green color by using a direct dye for rayon and disperse dye for acetate.

Tone on Tone Effects
Tone on tone effect is also possible by using one dye bath. They are light and dark shades of the same color in a fabric containing only one generic fibre – for example, deep red and light red colors on the same piece dyed polyester fabric. The effect can be produced by combining two different types of polyester in the same fabric. Both types are capable of combining with the same dye class, but one fibre has strong affinity for dye than the other. The fibre with the stronger affinity combines with greater quantity of dye, becoming deeper in shade, and second fibre remains a lighter shade of the same color. Tone on tone effects can only be achieved with the specific varieties of nylon, polyester and acrylic fibres. These special properties are imparted during the manufacture of the fibre, and the fibres are marketed to textile producers as deep –dye types. In addition nylon is produced in both deep-dye and ultra-deep-dye varieties, thus providing the possibility for three-tone effects of the same color. The tone on tone effects is widely used in the carpet industry for producing tweed-effect designs on piece dyed carpeting.

Collected by bipul

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