注射器密封件的漏气
Air leakage in seals with application to syringes
摘要：
本文对聚四氟乙烯胶塞注射器和玻璃针筒注射器的漏气情况进行了研究。泄漏率取决于界面表面粗糙度、橡胶的粘弹性和Teflon涂层的弹塑性。测得的泄漏率相比，一个简单的理论的预测气体流动，它考虑到扩散和弹道空气流，和弹塑性多尺度接触力学，确定界面分离的概率分布。该理论表明，界面气流（泄漏）通道非常狭窄，气体流动主要是弹道（所谓的努森极限）。容器密封完整性的影响进行了讨论。
英文摘要：
We study the leakage of air in syringes with Teflon coated rubber stopper and glass barrel. The leakrate depends on the interfacial surface roughness, the viscoelastic properties of the rubber and on the elastoplastic properties of the Teflon coating. The measured leakage rates are compared to the predictions of a simple theory for gas flow, which takes into account both the diffusive and ballistic air flow, and the elastoplastic multiscale contact mechanics which determines the probability distribution of interfacial separations. The theory shows that the interfacial air flow (leakage) channels are so narrow that the gas flow is mainly ballistic (the so called Knudsen limit). The implications for container closure integrity is discussed.
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