The cleanliness of the vacuum chamber wall of the vacuum coating machine is very high
The cleanliness of the inner wall of the vacuum chamber must be high; the surface of the parts must be smooth; the amount of material outgassed must be small; the parts of the vacuum chamber must be strictly cleaned; the surface of the parts must not be directly touched by hands; strictly control the vacuum chamber Leak rate. In addition, it is necessary to bake a vacuum chamber, the baking temperature range is 200°C~250°C, and the continuous baking time is 10h~12h (or 350°C~400°C baking temperature, continuous baking 4h) .
There are two possibilities for why the vacuum coating machine is getting slower and slower.
1. Due to the long time coating inside the equipment, some dirt will deflate during heating. Therefore, maintenance is required in this case, that is, remove the internal shielding plate by sandblasting or stripping and clean it thoroughly.
2. Small leaks are not found, especially the sealing of various transmission parts. This situation is more difficult to check. If there is no leak detector, only part of it can be removed or replaced with blind plates to eliminate it. Some people use the needle to inject alcohol to observe the change of the vacuum gauge, but it is generally difficult to judge when the leakage is not large. As for the vacuum 1.9 that you said is actually not high, the leakage rate is based on the volume of your equipment. And the degree of vacuum drop per unit time is not calculated according to the vacuum value. For example, if your vacuum pump has a good pumping speed and a strong pumping ability, it is possible to overcome the slight leakage and make the vacuum display a higher value.
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