Absorbency Test

 

Absorbency Test


Method A – By drop test
Drop of 0.5g/l methylene blue solution is placed on the fabric surface from a height of 2.5cm with the help of pipette. A stop watch is started as soon as the drop falls on the fabric and stopped no sooner the image of the reflected light disappears at the edge of the drop i.e. the water drop is completely absorbed by the fabric. This is termed as ‘drop absorbency time’. A drop absorbency of about 5sec is generally considered satisfactory for well-prepared Cellulosic materials.

AATCC/ASTM Test Method TS-018, Procedure for Absorbency

Scope: This test method is designed to measure the water absorbency of textiles by measuring the time it takes a drop of water placed on the fabric surface to be completely absorbed into the fabric.

  • Sample is placed over the top of a beaker so that the center is unsupported
  • A measured drop of water is placed on the fabric 1 cm from the surface
  • Time is recorded until the water drop absorbs completely
AATCC Test Method 79, Absorbency of Textiles

Scope: This test measures a fabrics propensity to take up water.

  • Sample is placed in an embroidery hoop with all creases out of it
  • A burette dispenses a drop of water onto the surface of the fabric from a distance of 9.5mm below the burette
  • Time is recorded until the water drop absorbs completely

Method B -- By sinking time
At least 4 samples of the size 1?´ 1? are cut. Each sample is kept on the surface of water taken in 500ml glass beaker. Time taken by the piece to sink just beneath the water surface is measured. A sinking time of about 5sec is generally considered satisfactory for well prepared Cellulosic materials.

Method C -- By capillary rise method
A 5cm wide strip is cut across the filling direction. The strip is then cut into 5cm long sections. The numbered specimens are then immersed 1mm deep in 1% aqueous solution of C.I. Direct Blue 86 for 2 sec and then immediately placed on a wire screen. After drying, the capillary rise of the dye solution is measured. The uniformity in absorbency across the width can thus be tested.