How to test the waterproof performance of three heat-resistant label paper?

Testing the waterproof performance of the heat-resistant label paper is an important step to ensure that it can resist moisture erosion in practical applications and keep the label information clearly readable. The following are some commonly used detection methods and steps:

1. Visual examination

Appearance observation: First of all, check the appearance of the heat-sensitive label paper to ensure that the surface is smooth, no damage, no cracks and other defects. These defects may affect the waterproof performance of the label paper.

Coating uniformity: Observe whether the waterproof coating is evenly covered on the surface of the label paper, without leakage, thin coating or thick coating. Coating uniformity is one of the key factors affecting waterproof performance.

2. Immersion test

Sample preparation: Select a certain number of heat-resistant labels as test samples to ensure that the samples are representative.

Soak treatment: The sample is completely soaked in clean water and kept for a certain time (such as 30 minutes, 1 hour, etc.) to simulate the moisture environment that may be encountered in practical applications.

Observation and evaluation: After soaking, remove the sample and observe its surface for watermarks, penetration or discoloration. At the same time, check that the information on the label is still legible to assess its waterproof performance.

3. Drip test

Drip treatment: Use a dropper or syringe to add a certain amount of water droplets (such as 5 drops, 10 drops, etc.) on the surface of the label paper, and observe the spread of the water droplets on the label paper.

Evaluate water resistance: Evaluate water resistance based on the water droplets' diffusion speed, diffusion range, and the label paper's absorption of water droplets. If the water droplets spread rapidly or are absorbed by the label paper, the waterproof performance is poor; If the water droplets remain beaded and impermeable, the water resistance is better.

4. Humidity test

Humidity environment simulation: Place the heat-proof label in an environment with constant humidity (such as 80%RH, 90%RH, etc.) for a certain period of time (such as 24 hours, 48 hours, etc.).

Observation and evaluation: Observe the change of the label in the humidity environment, for example, whether the label is deformed, faded, or ambiguous. At the same time, check that the information on the label is still legible to assess its water resistance and moisture resistance.

5. Professional instrument testing

Use waterproof tester: Use a professional waterproof tester to test the waterproof performance of the three heat-resistant label paper. Testers are often able to simulate different moisture environments and pressure conditions to more accurately evaluate the waterproof performance of label paper.

Data analysis: According to the data and results provided by the tester, the waterproof performance of the three heat-resistant label paper is objectively evaluated, and whether it meets the needs of practical applications.

In summary, the waterproof performance of the three heat-resistant label paper can be tested by visual inspection, immersion test, drip test, humidity test and professional instrument detection. In practical applications, appropriate detection methods and steps can be selected according to specific needs and conditions to ensure that the three heat-resistant label paper has good waterproof performance.