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

The waterproof level of BOPP thermal synthetic paper can be tested through a series of standardized testing methods. The following are some recommended testing methods for evaluating the waterproof performance of BOPP thermal sensitive synthetic paper:

1、 Waterproof performance testing method

Anti water pressure test:

Use specialized hydraulic testing equipment to place BOPP thermosensitive synthetic paper in the testing area.

Gradually increase the water pressure, observe and record the water pressure value at which the paper begins to leak water.

The waterproof level of paper can be evaluated based on the magnitude of the seepage water pressure.

Spray test:

According to GB/T 4857.9-1992 "Basic Experiments for Packaging and Transport Packaging Part 9: Spray Test Method".

Place BOPP thermal sensitive synthetic paper under the spray device to simulate the effect of rainwater spraying.

Observe and record the water seepage of the paper after spraying, as well as the degree of strength attenuation of the paper.

Immersion test:

Soak the BOPP thermosensitive synthetic paper completely in water and maintain it for a certain period of time (such as 24 hours).

After removing the paper, observe and record the water seepage on its surface, the integrity of the paper, and changes in strength.

2、 Waterproof rating evaluation standards

According to the water seepage situation:

No water seepage: The surface of the paper is dry and there is no water seepage.

Slight water seepage: There are a small amount of water droplets on the surface of the paper, but no obvious water stains have formed.

Obvious water seepage: There are obvious water stains on the surface of the paper, and even water droplets are flowing down.

According to changes in paper strength:

Strength without attenuation: The strength of the paper after soaking is basically the same as before soaking.

Slight attenuation of strength: After soaking, the strength of the paper slightly decreases, but it can still maintain a certain level of structural integrity.

Severe attenuation of strength: After soaking, the strength of the paper decreases significantly, and even the structural integrity cannot be maintained.

3、 Precautions

Testing environment: Ensure that the temperature, humidity, and other conditions of the testing environment meet the standard requirements to avoid the influence of environmental factors on the test results.

Testing equipment: Use professional testing equipment to ensure the accuracy and reliability of test results.

Test samples: Select representative BOPP thermosensitive synthetic paper samples for testing to ensure the universal applicability of the test results.

In summary, the waterproof level of BOPP thermal sensitive synthetic paper can be evaluated through methods such as water pressure resistance testing, spray testing, and immersion testing. Meanwhile, based on evaluation criteria such as water seepage and changes in paper strength, the waterproof performance of paper can be quantitatively analyzed. In practical applications, appropriate testing methods and evaluation standards can be selected according to specific needs to evaluate the waterproof performance of BOPP thermal sensitive synthetic paper.