How to judge that the UV ink is completely cured by the UV lamp, there are about 4 methods, sometimes the surface of the ink is observed by the naked eye, it seems to be cured, but in fact, it is not, how to identify it, you need to use a professional method (only limited to UV ink).
1. Pencil hardness test:
Test by pencil hardness tester, if it meets the requirements (usually 3-4h), it proves that the ink has been completely cured, if not, consider the curing time, whether the UV lamp power is sufficient, and the mesh belt transmission of the UV curing machine Various factors such as speed.
2. Dropping solvent test:
After dropping the propionic acid solution on the surface for 2 minutes according to the solvent properties, if there is a change, it proves that the ink has not been cured by the UV lamp. Analyze that after the ink is completely cured, the internal molecular structure will change, towards the double bond conversion, the conversion is complete, and the ink will form a tight coating layer as a whole.
3. Pressure test:
Flatten a weight of about 500g with the bottom surface, put a small amount of silk cotton fiber on the surface of the product, press the weight on the cotton fiber for a few minutes, and then remove the weight. If the cotton fiber does not stick to it, It can be proved that the ink is completely cured, otherwise, it is not cured.
4. Surface appearance:
The surface of the fully cured UV ink is very bright, there will be no lint, there is no phantom on the edge, and the overall effect is perfect.
The above methods are for reference only. For detailed technical questions, please contact our company’s technicians!