Printing adhesion of plastic parts after polishing.

1, improve product brightness and upgrade product grade.

2, protect the product, to achieve the ability of scratch and dust.

3. The product has high smoothness and low friction between products.

The above two uses (2 and 3) need to add wax to the varnish, which will float on the surface because it is immiscible with other components of the varnish, thus protecting the product and making it smooth.

But we know that the surface tension of wax is very low, its chemical and physical properties are very low, and it is not easy to dissolve and react with other substances, so it is difficult to print on wax!

I don't know why I need to print after polishing, so I can only propose two solutions to solve this problem:

1, polished with wax-free varnish, but this will lead to no smoothness and protection after polishing! It may also cause the varnish not to dry, because sometimes wax also acts as a surface film. Of course, if there is no wax in the varnish, it will be printed easily.

2. If the varnish can't be solved, you can only consider using UV ink with high penetration, because UV ink has a certain solubility in wax, and UV ink will not dry without ultraviolet irradiation, and it can be left for a long time, which can solve this problem to a certain extent. I have a successful case of printing matte ink and refractive ink.

3. Of course, if you have the ability to implement electric spark or corona treatment, you can also solve this problem, but this requires special equipment.

4. 10 years has been a technical supervisor in a large printing factory. I have been paying attention to glazing for two years and have studied it specially. Practice tells me that it is extremely dangerous to polish before printing, because it is difficult to overcome the problem of re-exertion. Let's talk about the reasons why we can't print first and then polish, and see if there are any other process lines that can achieve the same effect.

I hope the above answers can help you.