In today's building materials market, China printed color coated plates have gained widespread attention and application due to their unique colors, patterns, and excellent performance. However, for factories producing these high-quality color coated boards, ensuring the stability and durability of the products in various environments, especially humid environments, has become a crucial issue. This article will delve into how China printed color coated plate factory scientifically evaluate moisture resistance to ensure that every batch of color coated boards leaving the factory meets the needs and expectations of customers.

1. Evaluation method

1. Environmental simulation testing

Condensation Damp Heat Method: Place the printed color coated plate sample in a humid test chamber with a temperature of 38 ° C ± 2 ° C and a relative humidity of not less than 98%, so that there is no significant temperature difference between the sample and the surrounding steam, and condensation water forms on the surface of the sample. Evaluate the moisture resistance of the sample coating by measuring its water penetration resistance.
Non condensing wet heat method: Place the sample in a constant temperature and humidity test chamber with a temperature of 40 ° C ± 2 ° C and a relative humidity of not less than 95%, and indirectly reflect its moisture resistance by measuring the moisture resistance of the sample coating.

2. Direct water absorption test

Using a testing principle similar to the Cobb method, a certain amount of distilled water or deionized water is evenly dropped onto the surface of the printed color coated plate. After a certain period of time, the moisture penetration and penetration depth are measured to evaluate the moisture resistance of the color coated plate. However, this method may be more suitable for testing the moisture resistance of paper or cardboard, and for color coated boards, adjustments need to be made according to the actual situation.

3. Long term exposure testing

Place the China printed color coated plate sample outdoors or simulate a humid outdoor environment. After a certain period of exposure, observe the changes on the surface of the sample, such as discoloration, loss of gloss, blistering, rusting, etc., in order to evaluate its long-term moisture-proof effect.

2. Evaluation indicators

1. Coating integrity

Observe whether the sample coating remains intact in a humid environment, without cracking, peeling, or other phenomena.

2. Moisture penetration rate

Measure the moisture penetration on the surface of China printed color coated plates through direct water absorption testing or environmental simulation testing to evaluate their moisture resistance performance.

3. Appearance changes

Observe whether the sample shows any appearance changes such as discoloration, loss of gloss, blistering, rusting, etc. in a humid environment, in order to evaluate the impact of its moisture-proof effect on the appearance of the color coated board.

4. Performance retention rate

Compare the performance of China printed color coated plates before and after testing in humid environments, such as strength and corrosion resistance, calculate their performance retention rate,and evaluate the impact of moisture resistance on the overall performance of color coated boards.

3. Precautions in practical applications

1. Choose the appropriate color coated board

In practical applications, the appropriate type of printed color coated plate and coating thickness should be selected according to the specific usage environment and requirements to ensure good moisture resistance.

2. Strengthen maintenance and upkeep

Regularly clean and maintain the color coated board to avoid the accumulation of dirt and dust, which may affect its moisture resistance. At the same time, pay attention to checking the condition of the coating, repair coating damage in a timely manner, and extend the service life of the color coated board.

3. Pay attention to the construction environment

During the construction process of color coated boards, attention should be paid to the temperature and humidity of the construction environment, and construction should be avoided in humid environments to avoid affecting the moisture-proof effect of printed color coated plates.
Overall, evaluating the moisture resistance of China printed color coated plates requires comprehensive consideration of multiple factors and methods. Through scientific evaluation and testing, it can be ensured that the color coated board can maintain its excellent performance and appearance in humid environments, meeting the needs of practical use.