# Determination of Scouring Loss – Jerseys | Y-Neck | Plain Knitted

## Scouring Loss for Knitted fabric

### SCOPE

This standard prescribes a method for determining the scouring loss in jerseys, Y-neck, plain knitted, WORSTED textile materials.

### PRINCIPLE

The test specimen is taken and its moisture is removed. Then test specimen is scoured, washed and its oven-dry mass is determined. The scouring loss is calculated on the basis of oven-dry mass of the test specimen.

### APPARATUS

• Desiccator.
• Filter Paper thimbles
• Oven  – 102 ± 2°C
• Soxhlet extraction apparatus.
• Rotary evaporator

### REAGENTS

Benzene and methyl alcohol Mixture solution (3:2).

• Heat the extraction flask at 105 ± 3°C in hot air oven for 2 hours.
• Remove the flask and cool in Desiccator.
• Weigh quickly and note the dry weight of flask.

### PROCEDURE

• Cut about 10 g of the fabric. This shall constitute the test specimen.
• Dry the test specimen in the drying oven at 105 ± 3°C, cool in a Desiccator
• Weigh the specimen accurately to nearest 0.05 percent.
• Press the sample evenly into the filter paper thimble covered with cotton wool and place it in a Soxhlet extractor with the tarred flask
• Start the extraction of specimen with the benzene and methanol mixture (3:2) for 4 hours at the rate of 5 extractions per hour.
• Distill off the solvent from the extract in rotary evaporator.
• Dry the flask in oven at 105°± 3°C for 2 hours.
• Weigh to constant mass and determine the mass of dry residue.

### CALCULATIONS

Calculate the scouring loss by the following formula

Scouring loss, percent = 100 x W1 / W2

Where
W1 = mass of the dry residue

W2 = mass of the test specimen.

REFERANCE: – IS 2360:1977- Specification for jerseys, Y-neck, plain knitted, worsted Textiles.