Users who use 6090 uv printers will find a phenomenon, that is, sometimes the surface of the ink is observed by the naked eye, it seems to be cured, but in fact, it is not cured. So how to identify whether the ink has been cured?
There are 4 common methods:
1. Pencil hardness test:
Tested by a pencil hardness tester, if it meets the requirements (generally 3-4H), it proves that the ink has been completely cured. If not, consider the curing time, whether the power of the UV lamp is sufficient, whether the performance is attenuated, and the speed of the UV curing equipment and other factors.
2. Drop solvent test:
According to the performance of the solvent, after dropping the propionic acid solution on the surface for 2 minutes, if there is a change, it proves that the ink has not been cured by the UV lamp. Analysis After the ink is fully cured, the internal molecular structure will change, transforming to double bonds, and the conversion will be complete after high curing, and then the ink will form a tight coating layer as a whole.
3. Pressure test:
Use a weight of about 500g to level the bottom surface, and put a small amount of silk fiber on the surface of the product. Press the weight on the fiber for a few minutes, and then remove the weight. If the cotton fiber does not stick to it, it can prove 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 hairs, and no ghosts on the edges, and the overall effect is perfect.
Note: Generally, uv ink is not fully cured. In addition to the ink itself, more consideration should be given to whether the UV lamp and UV curing equipment can meet the requirements of curing ink.