How to test the waterproof performance of BOPP thermal synthetic paper?

The waterproof performance test of BOPP thermal synthetic paper usually involves a series of professional inspection methods and standards to ensure its waterproof performance in practical applications. The following are some commonly used waterproof performance test methods and steps:

1. Hydrostatic Pressure Test

How it Works:

Hydrostatic testing is used to determine the resistance of a material to water penetration. Under the conditions of standard atmospheric pressure, the continuous rise of water pressure is applied to one side of the sample until the other side oozes a specified number of water droplets, at which time the measured water pressure value is the hydrostatic value. The higher the hydrostatic pressure value, the better the waterproof performance of the material.

Steps:

1.In order to take a representative sample on the fabric, it is generally necessary to take several samples in different parts.

2.The wet sample is down-regulated under standard atmospheric conditions.

3.Using a hydrostatic tester, clamp the sample to the instrument to ensure that there is no air between the sample and the water.

4.Increasing water pressure is applied to the sample, the phenomenon of water seepage is observed, and the hydrostatic pressure value of the third place is recorded.

5.Repeated tests were averaged, and the results were expressed in kPa or Pa.

2. Spray Test

How it Works:

The spray test is used to simulate the impact of rain on the surface of the material and assess the ability of the surface to resist moisture. During the test, a certain amount of water is sprayed to the surface of the sample at a certain speed to observe the wetting of the surface of the sample.

Steps:

1.In general, at least 3 representative samples are required to be taken on the fabric.

2.The wet sample is down-regulated under standard atmospheric conditions.

3.The sample is fixed on the instrument with a spray type water repellent tester, and the warp direction of the sample is parallel to the direction of the water flow.

4.The specified amount of water is quickly and evenly injected into the spray device, and the spray is stopped after a certain time.

5.Quickly turn the specimen over and gently tap it to observe the wetting of the specimen surface and grade it according to the standard.

3. Rain Test

How it Works:

Rain testing is used to simulate the water resistance of materials under actual rainfall conditions, including surface wetting and permeability. During the test, the sample is placed in the rain shower device to receive a certain intensity and time of rain spray.

Steps:

1.A representative sample on the fabric is generally required to take at least 4 pieces.

2.The wet sample is down-regulated under standard atmospheric conditions.

3.Using the rain tester, the sample is placed on the test bench flat and without tension.

4.Set the intensity and time of the rain and start the rain test.

5.After the test, evaluate the water resistance and permeability of the sample, such as by weighing the quality change of absorbent paper to determine the water permeability.

Note:

During the testing process, it should be ensured that the test conditions meet the relevant standards or regulations to ensure the accuracy and comparability of the test results.

Different test methods and standards may be applicable to different application scenarios and material types, so the selection of test methods should be based on actual needs.

For special materials such as BOPP thermal synthetic paper, it may also be necessary to consider the stability of its thermal coating and the impact on the test results.

In general, the waterproof performance test of BOPP thermal synthetic paper needs to consider a variety of factors and methods to ensure that its waterproof performance meets the requirements in practical applications.