(a) Soil release finish: This type of finish Improves the resistance to soil during the day to day use of the fabric and provides easy releasing of soil during the washing operations and prevent the soil to redeposit on the fabric and retaining whiteness or the original colour of fabric.
The Soil Release Finish reduces the degree of soiling of the fabrics by:
1. Repelling the soil.
2. Preventing formation of bond between soil and fabric.
(c) Winch dying machine: It is a conventional type of dyeing machine consisting of a tub containing the dye liquor and an elliptical winch or reel which is located horizontally above the dye bath. In this machine both the ends of fabric are stitched together to make continuous rope form and is passed through the dye bath. The fabric is submerged in the dye bath and circulated repeatedly. Fabric is held in a slack in loose condition during dyeing.
Important Features of Winch Dyeing:-
a. Mainly used for knits and lightweight fabrics.
b. Filament yarn fabrics should not be dyed.
c. Very light weight fabrics should also be avoided.
d. Dyeing is carried out at high liquor ratios. (1:20 to 1:50).
