FZ/T 01118-2012Textiles. Testing and evaluation for anti-soil properties. Soil release (English PDF)

7.1 Washing method

7.1.1 Place the absorbent filter paper horizontally on the test bench. Take 2 specimens and put on absorbent filter paper respectively. On the 3 parts of each specimen, drop about 0.2 mL (4 drops) of soil liquid respectively. The distance between each part is at least 100 mm.

NOTE: The material of the test bench top is not absorbent.

7.1.2 Cover the plastic film on the soil liquid. Place the plate on the film. Press the hammer again. After 60s±5s, remove the hammer, plate and film. Continue to place the specimen for 20 min ± 2 min. Choose a contaminated area. Use the gray sample card for discoloration to evaluate the color difference between it and the uncontaminated part. Record it as the initial color difference.

7.1.3 According to the 6A procedure specified in GB/T 8629-2001, wash the two

specimens. The addition of ECE standard detergent is 20 g ± 2 g. Lay flat to dry after washing. It shall be ensured that the surface of the specimen is flat and free of wrinkles.

7.1.4 Use the gray sample card for discoloration to evaluate the color difference

between the uncontaminated part and the three stained parts of each specimen after washing.

7.2 Wiping method

7.2.1 Place the specimen flat on the absorbent filter paper. Use a pipette to drop about

0.05 mL (1 drop) of the soil liquid into the center of the specimen.

7.2.2 Use a glass rod to evenly spread the droplet in a circular area with a diameter of about 10 mm. For self-diffused droplets, there is no need to spread.

7.2.3 Lay the specimen flat to dry. Use the gray scale card for discoloration to evaluate the color difference between the contaminated part and the uncontaminated part. Record it as the initial color difference.

7.2.4 Wet the cotton standard lining with water. Make its liquid carrying rate 85%±3%.

7.2.5 Wipe the contaminated area vigorously in one direction with a cotton standard

pad. The cotton standard lining needs to be changed to another clean place to continue wiping every time it is wiped. Wipe 30 times in total.

7.2.6 Use the gray scale for discoloration to evaluate the color difference between the uncontaminated part and the circular uncontaminated area of the specimen after wiping.

8.1 Result presentation

Washing method: In the same specimen, if there are 2 or 3 places with the same color difference series, take this series as the series of the specimen. If the three color difference series are not the same, take the median value as the series of the specimen.

Take the lower series of the two specimens as the test result of the sample.

Wiping method: Take the color difference between the uncontaminated part of the specimen and the circular stained area of the specimen after wiping as the test result of the sample. If the soil spreads on the fabric with the water during the wiping process, and the area of the soil after the spread is more than twice the contaminated area before wiping, it is directly rated as grade 1. The staining around the rating area or the fading of the specimen due to wiping shall be stated in the test report.

8.2 Evaluation

If necessary, evaluate the soil release of the sample according to the selected test method.

When the initial color difference is equal to or lower than grade 3, and the color difference series of the test result is 3~4 grades and above, the sample is considered to have soil release.

When the initial color difference is equal to or higher than 3~4 grades, and the color difference series of the test result is 0.5 grades or higher than the initial color difference, the sample is considered to have soil release.

NOTE: If there are other agreements between the relevant parties, the evaluation shall be carried out according to the provisions of the agreement.