The fabric surface wetting resistance tester is used to determine the wetting resistance (water staining) of fabric surfaces that have or have not been water-resistant or water-repellent finished, evaluate the surface wetting resistance of materials such as masks and fabrics, and compare the surface of the sample with the standard chart to evaluate the water repellency of the fabric surface. The equipment includes a metal frame that allows distilled water to be sprayed through a nozzle onto the sample at 45° and 150 mm below the nozzle, and the appearance of the specimen is compared with an optional photographic scale.
Applicable standards:
ISO 4920, BS EN 24920, BS 3702, GB/T 4745, AATCC 22, M&S P23, NEXT 23
Operation:
1. Place the sample on a metal ring with a diameter of 152mm, facing up, and ensure that its surface is flat and wrinkle-free.
2. Place the metal ring with the sample on the tester's storage table. Pay attention to the position of the sample when placing it, and ensure that the center of the sample ring is exactly aligned with the center of the spray pattern ring. For some twill, beaded or similar striped structures, when the sample ring is placed on the table, the direction of its stripes should be placed diagonally with the direction of the water flow.
3. Pour 250ml of deionized water at a temperature of 27±1℃ into the funnel of the tester and let it spray on the sample in 25-30 seconds. When pouring deionized water, do not let the beaker touch the funnel. If the funnel moves, it will change the pattern and shape of the sample spray. The spraying time must be between 25-30 seconds, otherwise the nozzle must be checked to see if its hole has become larger or blocked.
4. Hold one side of the sample ring, turn the sample face down, and quickly tap the other side against a hard object, then rotate the sample horizontally 180°, hold the original tapping point and quickly tap the original holding point again to knock off the unwetted water droplets on the sample surface.
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