Vacuum coating vendors would introduce leak check is to ensure that the vacuum degree of vacuum coating machine a check measures, referred to as "leak detection, vacuum degree of high and low is directly affect the coating effect, so the leak detection is necessary.
General vacuum indoor air leakage from the chamber wall of small holes or component part (s) before the connection of a fine seam, is formed in the extraction system make vacuum indoor pressure drop after extraction, external and internal pressure gas from high pressure of the external flow of low pressure vacuum inside, cause the loss of vacuum.
Vacuum coating plant is introduced in the process of leak detection, need to pay attention to some problems, can put the leak detection work well.
First, want to make sure the leak is virtual or real leakage, because the workpiece material can produce gas in different extent after heating, possible mistake from external flow into gas, this is the virtual leak, to eliminate this kind of situation.
Second, test the vacuum chamber of the gas seal performance, ensure airtight performance meets the requirements.
Third, check the leakage hole size, shape, position, the speed of air leakage, preparation of solutions and implement.
Fourth, determine the smallest can leak detection rate and the leak detection sensitivity of testing instruments, to detect the leakage situation of maximum range, avoid some drain holes are ignored, improve the accuracy of leak detection.
Fifth, to grasp the leak detection instrument, reaction time and the elimination of time, the time to master well, ensure the leak detection instrument work in place, less time, leak detection effect is poor, time grew, waste gas leak detection and artificial electricity bills.
Sixth, to avoid leaking hole blockage, sometimes due to error, leak detection process, some dust or liquid and so on, the leakage hole was blocked by a thought in the position does not leak, but when the blockage due to the pressure difference inside and outside to improve or for other reasons make the leakage hole is not blocked, and that there is a gas leak.
For vacuum coating equipment to do a good job of leak detection is very important, the cause of vacuum drop varied, we want to solve these reasons one by one, stable coating effect.
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