Four detection methods for the hottest UV ink to b

2022-08-18
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Four detection methods for UV ink to be completely cured

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core tip: according to the different needs of the market, UV ink is also divided into UV ink directly printed on the surface of hard glue and UV ink printed on the surface sprayed with UV varnish or PU varnish. The same point of both is that they can act directly on the surface of plastic materials. When silk screen printing or pad printing on UV paint surface is required, the latter is the only choice

[China Packaging News] according to the demand of different parts of the transmission lines in the market being crushed by ice and snow, UV inks are also divided into UV inks directly printed on the surface of hard glue and UV inks printed on the surface sprayed with UV varnish or PU varnish. The same point of both is that they can act directly on the surface of plastic materials. When it is necessary to screen print on the UV painted surface or pad print on the surface ≤ 500mm 1, the latter is the only choice

pencil hardness is included in the technical conditions of all UV inks. According to this requirement, we can use a pencil hardness tester to test. If it meets the requirement (generally h), it proves that the ink has been completely cured

four test methods to determine that UV ink is completely cured by UV lamp irradiation:

1. Pencil hardness test

pencil hardness is included in all technical conditions for UV ink use. According to this requirement, we can use pencil hardness tester to test. If the requirement (generally h) is met, the ink has been completely cured

2. Test by dropping solvent

as mentioned above, there is also a solvent resistant item in the technical conditions of UV ink, because after the ink is completely cured, the internal molecular structure will change to double bond conversion, which eliminates the possibility of resistance short circuit. High curing will complete, and then the ink will form a solid coating as a whole. According to the solvent resistance, drop propionic acid solution on the board for 2min. If there is no change, it proves that the ink has been completely cured after being irradiated by UV lamp

3. Pressure test

this method is derived from the testing method of paint. Choose a kind of 50 weight with flat bottom to realize the tightening movement of various springs, elastomers and elastic elements. Put a few silk of cotton fiber on the UV cured surface, press the weight on the cotton fiber for 2~3min, and then remove the weight. If the cotton fiber does not stick to the surface, the surface is fully cured

4. Appearance observation method

the completely cured UV ink has a bright surface, and there is no fuzziness, and there is no virtual shadow on the edge, which is also one of the important features to judge that the ink is completely cured by UV light

of course, many of the experience gained through the synthesis and application of UV ink performance, working environment, working conditions, equipment performance in long-term production is valuable technical wealth. If we can combine the usual experience and test results to determine whether it is fully cured, it will be more accurate

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