Initial Concentration Analysis of Inflatable Hollow Glass

Under normal circumstances, the lazy gas concentration of the same group of inflated insulating glass, measured in an independent glass laboratory, should be the same as that used in the factory inspection. However, when we discussed the test data of aerated glass collected by our National Glass Inspection Center, we found that this method is not necessarily established. The gas-filled test cell submitted by the manufacturer to the National Glass Test Center was marked with the concentration measured by four representative hollow glass manufacturers, which greatly exceeded 90%. Unfortunately, about 23% of the gas-filled test cells flashed a significant drop in concentration at the initial concentration test conducted by the National Glass Test Center, failing to pass the 85% initial concentration requirement. Some 23% of the gas-filled test units had even a sharp drop of 40% to 60%.

It is natural to think that gas leakage must constitute a huge difference between the two initial concentration measurements. However, after a more careful examination of the failed units, we did not find any criteria for prompting gas leaks, such as low-quality process levels, inward deflection, and elevated dew point temperatures. . In contrast, the coating quality including the sealant and the upper frame of the spacer are very good. In addition, there was no inward flexing in the presence of low-concentration pneumatic glass. After all, one of the most important things is that the dew point temperature is ≤ -40°C before and after the aging test.

Clearly, the low concentration of lazy gas in hollow glass is not convincing if it is explained by the phenomenon of lazy gas leakage. This hostile situation has caused great problems for us. Poor air quality is still caused by gas leakage. We find it difficult to say that the low concentration is due to the poor filling of lazy gas, because the on-site inspection conducted by the manufacturer of the insulating glass indicates that the concentration effect is more than 90%.

This hostile situation requires us to further deepen the discussion in order to prompt the cause of the attack. Our study found that the use of gas analyzers and measurement methods has a significant effect on the concentration before and after gas dispersion testing with respect to the concentration before and after the above-mentioned aging test. Of the four hollow glass producers, three used high-pressure discharge gas analyzers to measure lazy, aerated glass immediately after inflation. Two disadvantages have been discovered under this phenomenon. First, the high pressure discharge gas analyzer does not provide a reference for interleaving; secondly, the on-site spot test method performed on the inflator is logically erroneous because of the lazy gas concentration in the individual cell chambers before the gas is dispersed (approximately the demand 6 to 8 hours) is uneven. In practice, some manufacturers measure the gas concentration of each unit on the next morning of inflation. Before the end of the dispersion, we could not detect whether it was laminar or turbulent, so that practical concentration of aerated glass could not be obtained. In addition, we also found that in the application of the same test method, but the use of two different high-voltage spark profiler in the measurement of some of the hostile, even in the same unit after the dispersion on the same hostile. On the other hand, in contrast, only one of the four representative manufacturers used the paramagnetic oxygen analyzer to measure the gas concentration on the next day after production. The initial concentration of the gas and the concentration after aging were all in accordance with Insulating glass "concentration required by national standards. During the two experimental groups, we found that the sealant process used was of the same quality as the upper frame of the spacer and was produced using the same imported vertical hollow glass production line (LiSEC or Baichao).

The initial version of the latest edition of the "Insulating Glass" national standard is the first time that the initial concentration of an inflatable IG unit is ≥85%, and that after aging is ≥80%. The conclusions of this article are extremely important, especially with regard to the work of insulating glass in our country that has just officially taken shape. Some of China's hollow glass manufacturers are very reluctant to produce inflatable glass, and the main taboo comes from rapid gas leakage. Some people in the work tend to think that the lazy gas of inflatable glass will leak within two years.

We believe that after knowing the initial concentration of lazy gas in the inflatable glass, and only after the lazy gas has dispersed, can the accurate measurement be made. These representative manufacturers and any other manufacturers will run the inflated glass within two years after inflation. Concerns about the loss can be put down. After the lazy gas of the inflatable hollow glass is dispersed, the lazy gas can be measured and the quality of the gas can be identified. After the gas is dispersed, whether the laminar filling is still a turbulent filling will flash. Therefore, it is not difficult to find out the reasons and it is easier to improve the inflation quality, that is, the inflation concentration. Therefore, we encouraged China's hollow glass work to continue its gas filling operation because the low concentration of gas was mistaken for gas leakage. In fact, the problem of inflated gas quality is not high. After the dispersion, paramagnetic oxygen analyzers and/or heat can be used. The conductivity gas analyzer can easily and accurately measure the production process. In this way, we can avoid the leakage of thick gas and the low inflation quality.

Conclusion

The initial concentration of the aerated insulating glass should be clearly defined as the concentration after gas dispersion, instead of the spot concentration measured at the production site. The laminar flow or turbulence that occurs during the gas filling process is the root cause of the different inflation qualities. Secondly, prior to the gas dispersion of the gas-filled hollow glass, the concentration in the cavity is not uniform. The initial concentration refers to the stable and uniform concentration after dispersion. Therefore, choosing the right inflatable equipment and gas analyzer has a very important role in the correct measurement of gas concentration.