Clothes stained during washing or soaking? I believe that everyone is familiar with this situation, and many people should have encountered such embarrassing things.

This is due to the mixed washing of dark and light-colored clothes, the fading of dark-colored clothes and dyeing on light-colored clothes, resulting in staining of light-colored clothes, or the mutual staining of dark and light colors on a piece of clothing after washing.

In response to this phenomenon, there is a professional name in textiles: splicing and mutual dyeing.

Test methods for testing the interdyeing of textiles by splicing, namely the washing method and the soaking method.

The washing method

The sample is placed in the specified washing solution, mechanically stirred according to the specified bath ratio, time and temperature, then washed and dried, and the staining of the light-colored sample is evaluated with a staining gray card or an instrument.

The soaking method

The sample is placed in the specified washing solution, and after treatment, it is placed between two flat plates with a specified pressure in the test device. After cleaning and drying, the staining of the light-colored sample is evaluated with Gray scale for color staining or an instrument.

Sample preparation:

1. The sample is a ready-made garment. Cut a piece of dark and light-colored fabrics, 4×10cm, and sew them along the short side to form a combined sample.

2. Weigh the sample to the nearest 0.01g.

3. Add detergent according to the sample weight.

The sampling and soap solution configuration of the two methods are the same, the only difference is the test equipment and operating procedures.

Test Instruments

The washing method: Wash Colour Fastness Tester

The soaking method: Precision Drying Oven

Operating procedure

The washing method

1. Put the sample and test solution into the container

2. Put the container into the machine, set the temperature to 40 degrees, and test it for 30 minutes.

3. Take out the sample and rinse it with running water until it is clean.

The soaking method

1. Put the sample and test solution into the container, press and move from time to time to completely soak the sample, take out the sample and place it on the Perspiration Tester, and apply a pressure of 5000g.

2. Put the loaded sample into the Precision Drying Oven, the temperature is 37 degrees, for 4 hours, take out the combined sample, and rinse it with running water until it is clean.

The test temperature of the washing method is 3°C higher than that of the soaking method. In terms of test time, the washing method requires 30 minutes and the soaking method is 4H.

After the test is completed, after rinsing the test, it is necessary to absorb excess water with filter paper and hang it to dry.

The samples tested by the two methods are evaluated by Gray scale for color staining. From the test results, the stain level of the soaking method is much more serious than that of the washing method.

Color Fastness Test Machines about AVENO used in the experiment:

2. Fabric Perspiration Tester AC08

3.Precision Drying Oven AC12

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