How to select plastic materials for vacuum coating？
For the vacuum coating machine technology, plastic can also be coated, this is a technical development, but not all plastics can be used in the vacuum coating machine for coating, because the plastic itself with some characteristics is still unresolved coating technology.
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Then what kind of plastic can be used in the vacuum coating machine coating, summed up, can be divided into three points to choose.
First, plastic between itself and the coating layer should have certain affinity, only the combination of membrane layer and artifacts closely together, can not easily fall off, long service life, some can't and wax layer of plastic is good together, the researchers found that the plastic surface coated with a layer of first facilitate closely integrated membrane layer coating, thus solved the problem of the adhesion force, but this kind of coating outside the combined with membrane layer can strengthen, now also we should strengthen and plastic combination, at the same time satisfy the two conditions of coating is not so easy to find, said only part of the plastic can find corresponding coating, but still has some plastic is not found, And these plastics can not be used in the vacuum coating machine coating.
Second, plastic itself will contain some volatile impurities, as temperatures rise, can evaporate escape, but as the coating of the workpiece, can endure volatile matter is limited, so the selection of plastic material for vacuum coating, should choose to put the low gas, such effects on vacuum degree of vacuum coating machine operation can also take measures to make it under control, if a lot of will can't control and make the vacuum degree decline, affect the coating quality.
Last is the stability of the plastic is heated, plastic has been widely used because of its can under heating conditions according to the designer's willingness to create an image that you want to, this is the thermal deformation, but the coating of vacuum coating machine environment, must have a certain temperature, if the plastic deformation of thermal instability will, even if the plating film again good, deformation of workpiece has been, and what use, so for the coating of plastic material, use the heat generated by the lower than the melting point of workpiece vacuum coating machine, but some of the plastic is in a low melting point, the technology is still not solved, so the plastic is not suitable for coating of vacuum coating machine.
The continuous development of vacuum coating machine technology has enabled many materials that could not be coated before to achieve coating. However, there are still some materials that have not developed solutions. However, I am very looking forward to it.