How to choose plastic materials for vacuum coating

For the technology of vacuum coating machine, plastic can also be coated, which is a technical development, but not all plastics can be coated with vacuum coating machine, because some characteristics of plastic itself are current Coating technology is still unsolvable.

So what kind of plastic can be coated with a vacuum coating machine? To sum up, it can be selected in three points.

First of all, there must be a certain affinity between the plastic itself and the coating layer. Only when the film layer and the workpiece are closely combined can it not easily fall off and have a long life. Some plastics cannot be well combined with the wax layer. The researchers It is found that a layer of paint that facilitates the close bonding of the film layer is first applied on the surface of the plastic, which solves the problem of adhesion. The coatings of the two conditions are not so easy to find. Only some plastics can find the corresponding coatings, but some plastics have not been found yet, and these plastics cannot be coated with a vacuum coating machine.

Secondly, the plastic itself must contain some volatile impurities, which will volatilize and escape as the temperature rises, but as a workpiece that can be coated, the volatile substances that can be tolerated are limited, so when selecting plastic materials for vacuum coating , It is necessary to choose the one with less outgassing, so that measures can be taken to control the influence of the vacuum degree during the operation of the vacuum coating machine. If there is a large amount, the vacuum degree will not be controlled and the vacuum degree will be reduced, which will affect the coating quality.

The last is the thermal stability of plastic. Plastic is widely used because it can shape the desired image according to the designer's wishes in a heated state. This is thermal deformation, but in the coating environment of the vacuum coating machine , a certain temperature must be generated. If the plastic is unstable when heated, it will deform. Even if the coating layer is good, the workpiece has been deformed. However, the melting point of some plastics is really low, and the current technology has not yet been solved, so these plastics are not suitable for the coating of vacuum coating machines.

The continuous development of vacuum coating machine technology has enabled many materials that could not be coated before to achieve coating, but there are still some materials that have not developed solutions, but I am looking forward to it, because technology is endless, and many technologies that could not be imagined before , are now implemented, and a new page must appear in the future.