Realization of non-lubricated sliding between polymer gasket and cylinder by using controlling surface mechanical property of material

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In cylindrical sliding components such as syringe and shock -absorber, technology to decrease friction between a polymeric gasket and relatively rigid cylinder without using lubricants is required. In this work, we tried to show the possibility of non -lubricated motion of such cylindrical sliding components, where 1. Elastic modulus increase of gasket surface with high-density plasma treatment, 2. Surface fluorination of polymeric gasket using PFPE and UV irradiation, and 3. Internal DLC coating, which had been developed in our laboratory, were considered to be employed. As a result, we successfully demonstrated the smooth motion of non-lubricated plastic syringe (PP barrel vs Thermo-plastic elastomer gasket) by employing 1 and 4. Minimum design change of gasket shape, where seal capability was also satisfied. Furthermore, monitoring technique to achieve uniform distribution in internal DLC coating was established.