Water absorption test method AATCC-79

1. Purpose and scope

Water absorbency is one of the factors that determine the specific use of cloth. It is very important for preparing cloth for dyeing,

Because the integrity and uniformity of dyeing are directly related to the water absorption of textiles. When the cloth passes through resin or other

When special finishing, water absorption is a factor to consider. The water absorption or wettability of fabric or yarn can be determined by the following

This method is measured.

2. Principle

A drop of water drops from a fixed height to the surface of the test sample. When the reflective surface of the water drop disappears, record the result

The required time is the moistening time.

3. Equipment

3.1. Embroidery hoop with a diameter of 15cm or larger﹔

3.2. Buret, which can provide 15~25 drops per milliliter;

3.3. Stopwatch﹔

3.4.Titration stand﹔

4. Test sample

4.1. The size of the cloth used for testing should be able to completely cover the embroidery hoop.

4.2. All test samples must be placed in a standard environment (21±1℃, 65±2%RH) to achieve moisture balance.

5. Steps

5.1. Test under standard environment (as above).

5.2. Fix the fabric pattern flatly on the embroidery hoop, but you need to pay attention to whether the shape of the pattern is changed.

5.3. Place the embroidery hoop 1.0±0.1cm away from the buret nozzle, and then let a drop of distilled water or

with a temperature of 21±3℃

Deionized water is dropped on the cloth.

5.4. Use a stopwatch to record the time the water droplets begin until the reflective surface completely disappears. The maximum recording time is 60 seconds. This point depends on when the light reaches a specific angle with the observer, and the reflectivity of the water droplets completely disappears on the cloth surface. As the water is gradually absorbed, the reflectivity of the water droplet surface will gradually decrease until it disappears completely, leaving only a completely non-reflective watermark. At this time, stop the stopwatch and record the required time. When the wet time exceeds 60 seconds, record 60+ seconds and read a total of 5 values.

6. Calculation and Rating

Calculate an average from the 5 values. The shorter the average time, the higher the water absorption of the textile. 5 seconds or

The following times generally indicate good water absorption.