| 摘要 |
PURPOSE:To make an electret commodity repeatedly usable by processing a used electret commodity after washing so that the used commodity can be restored to the original electret commodity. CONSTITUTION:Since the material used for making electret commodities is a highly water-repellant material, such as polypropylene, 'Teflon(R)' polycarbonate, etc., and the electret commodities have less wettability against water, the optimum cleaning method of the electret commodities is not water washing, but washing with a washing solution in which a little amount of a nonionic surface active agent is dissolved. The material which is restored to an electret commodity again is led into an electric field in a state where the material is closely fitted to an earth electrode in a flattened state. The reason why the material is flattened is that, when all projecting parts are eliminated from the material and the intensity of the electric field is made uniform in intensity, occurrence of spark discharge can be prevented effectively. The concrete method for restoring the material to an electret material again includes a method by which the material is closely fitted to the earth electrode through a net-like material. |
