UV printer UV ink curing inspection method
There are four common methods for UV printer UV ink curing inspection:
1.Use pencil hardness test
The technical conditions for the use of UV inks all include pencil hardness. According to this requirement, we can use a pencil hardness tester to test. If it meets the requirements (generally 3-4h), it proves that the ink has completely cured.
2.Testing with dripping solvent
As mentioned above, there are also solvent-resistant items in the technical conditions of UV inks, because after the ink is completely cured, the internal molecular structure will change, and the transition to the double bond will be complete, and the high curing will be complete, and the ink will form a tight coating as a whole. Floor. After dropping the propionic acid solution on the surface of the board for 2 minutes according to the solvent resistance performance, if there is no change, it is proved that the ink is completely cured after being irradiated by the UV lamp.
3. Inspection by pressure method
This method is derived from the detection method of coatings. Select a 500g weight with a flat bottom surface, put a few silk fibers on the UV-cured surface, and then press the weight on the cotton fibers for 2 ~ 3min, then remove the weight, if the cotton fibers do not stick to the surface Prove that the surface is completely cured.
4.Appearance observation method
The fully cured UV ink has a bright surface, and there is no fluffy phenomenon, and there is no ghosting on the edges. This is also one of the important characteristics to determine that the ink is completely cured by the UV light.
When the UV printer UV ink is found to be incompletely cured, the following methods need to be solved:
1. Check whether the power of the uv-led lamp is normal. If not, see if the power is increased.
2. If the weather is too cold in winter, keep the indoor temperature between 15-30 ° C, which will help the curing of UV ink.
3. If there is moisture on the surface of the material, it will also affect the curing of the UV ink. Before printing, it must be wiped clean in advance.
4. The UV ink has expired. Usually the shelf life of UV ink is within 1 year. If it exceeds the time, it will be unusable and need to be replaced with new UV ink.