Abstract
Many industrial instruments use rubber; NBR (Nitrile Butadiene Rubber) is especially used for the packing attached to pneumatic equipment. Recently, with the spread of dry pneumatic pumps, the deterioration of NBR by ozone has become a serious problem. However, the process of ozone degradation of NBR has not been sufficiently clarified. In general, the evaluation method of the deterioration of NBR is identified in Japanese Industrial Standards (JIS). From a practical point of view, it is not enough to just observe crack behavior of test pieces, but it is also important to estimate the mechanical characteristics in real time. Therefore, we developed a degradation monitoring device using a pneumatic servo system with a nozzle-flapper, and evaluated the performance of the device. As a result, it was verified that the monitoring device can be used for tension measuring of NBR under a constant strain condition.
