Vat Scouring Research Paper

DESIZING

Desizing is the first wet processing technology employed to remove the sizing materials from the surface of the clothes.

It depends on:

1) The solubility of the film forming polymer.

2) On the effects of numerous subsequent wet processing steps.

3) On the interactions with added chemicals.

Objects of Desizing:

 To remove sizing materials.

 To increase absorbency of the fabric.

 To increase lusture of dyed or printed fabric.

 To make fabric ready for next process.

Batching Process: After desizing fabric is collected in rolled in batcher in uniform tension. Then the fabric goes for rotation of 10-12 hours. For proper decompose of starch it is essential.

Rotation:

After batching the fabric is packed by poly bag. Then it goes for rotation for 8 to 12 hours. In this time water react with starch in presence of enzyme & decompose starch as water soluble glucose.

Scouring

Scouring is the process by which all natural

Almost any dye, including fiber-reactive dyes, direct dyes, and acid dyes, can be used in a vat dye. Cotton, wool, and other fibers can be all dyed with vat dyes.

Reactive Dyes:

Reactive Dyes form a covalent bond between the dye and fiber. It contains a reactive group (often trichlorotriazine), either a halo heterocycle or an activated double bond, that, when applied to a fibre in an alkaline dye bath, forms a chemical bond with a hydroxyl group on the cellulosic fibre.

Pigment Dyes

Although pigments are not dyes in a true sense, they are extensively used for coloring fabrics like cotton, wool and other manmade fibers due to their excellent light fastness. They do not have any affinity to the fibers and are affixed to the fabric with the help of resins. After dyeing, the fabrics are subjected to high temperatures.

Sulfur Dyes:

Sulfur dyes are synthetic organic substantive dyes for cellulosic.