pvd coating machine plating matrix, sometimes there will be film color differences, this situation for processing manufacturers, is not in line with qualified product standards, generally appear film color difference products, are bad products. Therefore, the occurrence of this situation, the manufacturer is also very concerned about, then the vacuum coating machine in the coating process, the matrix film color difference, how to deal with it? Coating matrix, there are generally 2 kinds of film color differences (excluding color spots), one is the color of the film on the whole mask, in the middle and under the color is inconsistent, that is, the spectral test curve is different; Second, the single film color is inconsistent.

The first: the color inconsistency of the upper and lower film is called the uniformity of the whole umbrella (cover) is not good, also known as the umbrella difference. The main reason is that the uniformity correction plate (correcting plate) has problems.
The second: umbrella deformation. It is also one of the reasons for the uneven color of the film, especially the umbrella that has been used for a long time, which used to be uniform, slowly becoming uneven, and the deformation of the umbrella may be the main reason.
Third: the inconsistent condition of the film material, especially the sublimation and semi-sublimation film material is biased, and the digging will also seriously affect the uniformity of the whole mask and the single piece. Especially when there is a large number of manual pre-melting, the operation of each person is different, and the material condition obtained will be different.

pvd coating machine coating film color difference solution:
First: Adjust the correction plate, try to consider the balance of the high and low refractive index film material compatible, if there are two evaporation sources, possible conditions, independent use of the respective correction plate, to avoid interference.
Second: conditions permit, the use of planetary fixture.
Third: umbrella shaping, the umbrella shaping can first process an R basic mode (choose a higher strength of raw materials), and shape the umbrella on the basic mode. In order to prevent the deformation of the umbrella, the thickness and raw material selection of the umbrella should be appropriate when the umbrella is ordered.
Fourth: Strengthen the management of the umbrella, especially when placed, to prevent deformation due to improper placement.
Fifth: Improve the condition of the film material, especially when the electron gun evaporation sublimation, semi-sublimation material, can not collapse the film material and dig a pit.
Sixth: The film material that can be automatically premelted should be automatically premelted as far as possible to reduce the influence of human factors.