| 摘要 |
PURPOSE:To check initial leakage, evaluation of moisture resistance and watertightness by mounting a filter whose efficiency is to be evaluated on a supporting base by setting an upstream side of said filter as an upper surface, filling the upper surface side with pure water and checking pure waterdrop leakage of the downstream side after staying it in a water gauge. CONSTITUTION:The high efficiency filter 1 to be evaluated is mounted on the supporting base 4 by setting the upstream side for transmitting air as the upper surface, and the pure water 10 is filled at the upper surface side of the filter 1. If the filter 1 has initial defects, it can be judged by an initial water quantity staying in the water gauge 6 or visual inspection of the state of water flowing down through a receiving dish 5. By measuring a water quantity leaked from the filter 1 in relation with time of a timer 7, an accelerated evaluation of moisture resistance and watertightness of the filter 1 is judged. For checks of leakage and collecting effect of the filter 1, the examination is performed for about 10-20hr by above-discribed evaluating apparatus to confirm the filter 1 of no leakage, the pure water filled therein is discharged gently to dry the apparatus, then the transmission test of high molecular latex is performed again. |
