Monday, 1 October 2007

Textile Dyeing -3

Dyeing and Types

Dyeing can be done during any stage in the manufacture of a textile. They may be dyed as fibre, as yarn, as fabric or as garments, depending on the type of fabric or garment being produced.

Stock dyeing refers to the dyeing of fibres or stock, before it is spun into yarn.

Sliver of worsted known as top is sometimes dyed in the stage of manufacture between fibre and worsted yarn.

Skein dyeing consist of immersing large, loosely wound hands of yarn into dye vats which are specially designed for this purpose.

In package dyeing, about a pound of yarn is wound on a small perforated spool or tube called a package. Many spools fit into dyeing machine in which the flow of the dye bath alternates from the centre to the outside and then from the outside to the centre of the package

In Beam dyeing, an entire warp beam is wound on a perforated cylinder, which is then placed in the beam dyeing machine where the flow of the dye bath alternates as in package dyeing.

The main reason for the dyeing of yarn is for the manufacture of plaids, stripes, checks and other multicoloured designs.

Cross dyeing

It is a special type of dyeing in which a yarn, a fabric or even a garment made with two or more kinds of fibres having different dyeing qualities is dyed in a single bath containing two different classes of dyes. Each kind of dye colours only one type of fibre. Two different colours can be dyed in one dye bath or either type of fibre may be dyed, leaving the other white.

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