How to judge whether the UV ink is completely cured

1. Use the pencil hardness test All the technical conditions of the UV ink use the pencil hardness. According to this requirement, we can use the pencil hardness tester to test. If it meets the requirement (usually 3 ~ 4h), it will prove the ink. It has completely cured.

2. Testing with Dropping Solution As mentioned in the same paragraph above, the technical conditions of UV inks also have solvent resistance items. According to the performance of solvent resistance, the propionic acid solution is dripped on the board surface for 2 minutes, and if no change is confirmed, it is completely cured. Because the ink completely cures, the internal molecular structure changes, and the double bonds are converted, and the conversion is completely cured. As a result, the ink as a whole forms a tight coating layer.

3. Pressure test This method is based on the detection method of paint. Choose a 500g weight with a smooth bottom, put several cotton fibers on the UV-cured surface, and then press the weight on the cotton fiber for 2 to 3 minutes, then remove the weight, if the cotton fiber does not stick to the surface The surface is fully cured.

4. Appearance observation method The fully-cured UV ink has a shiny surface, and there is no hairiness phenomenon, and there is no imaginary image on the edge, which is also one of the important features to determine the complete curing of the ink. Of course, many of the experience gained through the synthesis and application of UV inks in terms of performance, work environment, working conditions, and equipment performance during long-term production is a valuable technological asset. However, today's technology continues to evolve and how to make valuable The combination of experience and scientific actual combat will become the development direction of the industry. It is more accurate to determine whether or not to completely cure by combining the usual experience and testing.