Desizing of Cotton
Desizing Process of Cotton:
For Jigger Dyeing
Cold Method :
Minzyme ADZ : 1.5%
Minwet ZFF ` : 1%
Eco Acid/Acetic Acid : 0.3%
Pad at Pick up of 90-95% è Hold for 12 Hrs è Wash è Dry
For Hot Process for
Hot Method for Jet & Jigger :
Minzyme ADZ : 1.5%
Minwet ZFF : 1%
Eco Acid/Acetic Acid. : 0.3%
Run at 90°C / 30 min then wash & Dry
The degree of desize – the TEGEWA-violet
Because there is a relation between the colour intensity of the
iodine starch complex and the residual starch content on the
fabric, the colour reaction of starch and free iodine is applied in
a semi-quantitative way to judge the residual size content or
better the residual content of starch after the pretreatment.
Procedure
A fabric sample of approx. 4 x 4 cm is laid for one minute into a
iodine solution at a concentration c(I2) = 0.0025 mol/l
(= 0.005 N), rinsed with cold water for a short time and then
dapped off with a starch free filter paper and compared
immediately with the TEGEWA-violet scale
The mark 9 on the scale indicates a complete starch
elimination, and mark 1 an insufficient one.
The solution itself can be made as follows:
10 g potassium iodide are dissolved in 100 ml of water, 0.65 g
of iodide are added and agitated until complete dissolution.
Then filling up with distilled water up to 1 l.
Remark
Because of the volatility of the iodine, iodine solutions should always be kept in a brown flask closed with a ground-in stopper.