As a customer who purchases silver paint, I don't know if you have ever encountered this situation. You sent an original piece to the manufacturer, and the manufacturer mixed the silver paint sample according to the original color requirements and painted an identical sample. The original, silver paint sample and the painted sample will be sent back to you together. You can compare through natural light and through instrument testing. There is no problem at all. The colors are exactly the same. But when you actually spray paint, the sprayed color is wrong. It is either darker or lighter. What is the reason? Today we will decipher the reason why the color of silver paint is accurate but the color sprayed on the product is inaccurate!
We all know that in the process of silver paint spraying, color accuracy is one of the decisive factors affecting the painting effect. When we find that the color is not as expected when spraying, it is often the result of a combination of factors!
Here we will explain and give our solutions to this problem in order according to the large and small influencing factors. Let's get straight to the real stuff without any nonsense!
First: spray gun air pressure problem,
Too much or too little air pressure in the spray gun may cause the color to deviate from the design requirements. Therefore, when solving this problem, we need to conduct an in-depth analysis of the reasons why the color becomes lighter due to excessive air pressure in the spray gun.
Cause Analysis:
Silver powder paint is mainly composed of silver powder (aluminum powder) and color paint. The color paint is responsible for the overall color, while the silver powder gives the paint surface a metallic texture. When the air pressure of the spray gun is too high, the degree of atomization of the paint will increase significantly, and the particles will be more easily dispersed in the air, and the air flow will blow away the atomized paint. Since the silver powder is heavier than the paint, excessive air pressure will blow the paint away, leaving only the heavier silver powder deposited on the sample board. This results in less paint on the sample, ultimately causing the color to become lighter.
On the contrary, the problem of the air pressure of the spray gun being too low:
On the contrary, if the air pressure of the spray gun is too small, the silver powder will be easily deposited due to the large specific gravity of the silver powder. Due to insufficient air pressure, the silver powder cannot be extracted and sprayed out normally, resulting in almost all of the sprayed paint being colored paint. In this case, the silver powder is excessively deposited, making the color darker, while the metallic texture is weakened, and the overall appearance does not meet the design requirements.
Solution:
The following specific solutions can be taken:
Adjust the air pressure of the spray gun: Adjust the air pressure of the spray gun to an appropriate level, usually around 6 air pressure. Make sure to use a professional air compressor and monitor the air pressure by watching a barometer. These 6 air pressures are the results of our many experiments and can be used as a reference.
Nozzle Selection: Different spraying tasks may require different types of nozzles. Choosing the right nozzle can help you better control your spray, allowing you to adjust the air pressure to achieve the desired color effect.
Real-time adjustment: During the spraying process, the color of the silver paint is monitored in real time and fine-tuned as needed. By adjusting the air pressure control valve on the spray equipment, real-time color adjustment can be achieved.
Then in addition to solving the air pressure problem, you need to pay attention to the following key factors:
2. Use of diluent:
Adding the right amount of thinner is one of the key steps in adjusting the shade of color. Choose the appropriate diluent according to your needs. Through many experiments here, we have given a specific adding amount of 20% diluent. Of course, this is an adjustment to our brand of silver paint. You can refer to it. You only need to pay attention to the following principles. That's it. If there is less diluent, the color will be too dark. If there is too much diluent, the color will be too light. You can add and adjust it multiple times according to the actual situation for comparison to achieve the ideal result.
Third: wet method in the selection of spraying method
Choosing the right spraying method is also crucial. Through experiments, we finally chose the medium-humidity spraying method. This method requires the relative humidity of the spraying environment to be between 40% and 70%. The advantage of this method is that in an environment with moderate humidity, the coating is more likely to be evenly distributed after spraying, which helps with color consistency.
Of course, the final control of the distance between the spray gun and the workpiece surface and the movement speed also need to be taken into consideration, but these are just some small details. The most important thing is to adjust and gradually optimize through the above three points.
Through the above detailed adjustment methods, we can more specifically solve the problem of inaccurate silver paint spray colors and ensure that the spray effect better meets the design requirements. These adjustments not only require skilled operations, but also need to be applied flexibly according to the actual situation. We hope that our experience can help everyone, provide you with better operating guidance, and improve work results and production quality.
