Purpose & Scope:
This test method gives the procedure to determine the size content of sized yarn. This is applicable to sized yarn or greige fabric.
- 0.1 N Hydrochloric acid,
- Hot plate/water bath.
- Glass beaker 250m1,
- Glass rod, Strainer, Scissors.
- Weighing balance.
- Measuring cylinder.
- pH paper.
- Hot Air Oven.
- Watch glass, stop watch, thermometer.
- Desiccators etc.
A.Take the sample and dry in hot air oven to remove any moisture.
B. Weigh about 2gm sample (note the exact weight, as A gm).
C.In the 250 ml glass beaker take 0.1 N Hydrochloric acid and heat the beaker on hot plate/ water bath at 90°C, After reaching 90°C when liquor starts to boil then cool down the temperature to 60°C.
D.Then add the preconditioned sample (“A” gm) in liquor and continue heating for 20 min ± 2min by maintaining the material to liquor ratio of 1:50.
E. After 20 min. remove from hot plate/ water bath. Carefully strain through strainer, rinse with cold water till free from acid.
F. Dry in hot air oven at 110°C for 01 hour. Cool in desiccator.
G. Weigh the dried sample and note the weight, as “B” gm,
H.Calculate the weight loss and size content and report.
Size Content = [(A-B) x100] /A
A= Weight of sample.
B= Weight of sample after acid treatment.
°/o Size Add-on = [(A-B) x100] /B
Actual Size %Add-on = % Size Add-on – % impurity present in raw yarn.
Report the % Size content and % Size add-on value.