Question 15 (Textile Engineering & Fibre Science)
A fabric is to be dyed in 4% shade on a continuous dyeing machine. The padding mangle of the machine is set at 80% expression. The concentration (g/l) of the dye in the padding bath should be
| (A) | 32 |
| (B) | 40 |
| (C) | 50 |
| (D) | 56 |
[Show Answer]
Option C is correct.
Given-
Dye shade%=4%
Expression%=80%
The concentration(g/l) of the dye in the padding bath=?
Let the fabric weight=100 kg
Then, dye wt=100 x 4%
Dye weight=4 kg
=4000 gm
By formula-
Wet pick up expression=dye add on x 100/Concentration
80=wt. of size part in liquor x 100/Dry wt of fabric
80=Wt. of size part in liquor x 100/100
Wt. of size part in liquor=80 kg
As we know,
1kg =1ltr
80kg=80 ltr
By formula-
Concentratio(g/l)=Dry wt. of size /Volume of liquor in litre
Concentratio(g/l)=4000/80
Concentratio(g/l)=50 (Ans)