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ABSTRACT: T various polymer films with high resistivity are developed for various usage. Because of that excellent electric properties (high resistivity, in practice), it is very easy to accumulate the charge accidentally. That charge causes various electrostatic hazards including the electrostatic discharge. To prevent those electrostatic problems, charge behavior on/in the polymer film must be identified. The authors have already constructed the simultaneous TSDC (thermally stimulated discharge current) and LIPP (laser-induced pressure pulse) measuring system to investigate those problems. Tested samples are polyethylenetelephtalate and naphthalate (PEN) which are charged by the corona discharge. Some charge is injected from the back side (grounded side) and from the top side. There are some difference between those charges (TSDC peak temperature is not unique). Some charge change without TSDC flow is also identified near the room temperature indicating the mechanical contact change with the temperature and the surface leakage of the charge.
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005
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T. Oda
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ABSTRACT: An atmospheric-pressure needle corona discharge is a very effective technique in charging polymer films such as PTFE Teflon, PP etc. After that charging process, the author has a strong interest on that charge behavior on/inside the film, especially related with the electrostatic discharge (ESD) phenomena. The author developed the ESD observing system and investigated the charge stability related with the back side electrode, for example. TSDC, PSDC and LIPP methods have been developed for that purpose. Those developed analyzing method and experimental results are described.
Electrets, 2005. ISE-12. 2005 12th International Symposium on; 10/2005
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ABSTRACT: A novel simultaneous space charge measuring system for a charged thin film was developed. The space charge in-depth profile of a charged film is observed by a typical LIPP (laser-induced pressure pulse) method by using a 100 picoseconds YAG laser in a new measuring cell. That new cell can be heated up to 200°C at a constant temperature increasing rate and subpicoampere current flow through a sample thin film can be recorded by a computer system. LIPP method needs only a few second and TSDC current measurement is stopped during that LIPP measuring time that does not affect the final TSDC spectrum which needs much time of roughly an hour. This new combined method can tell us the relationship between the space charge in-depth position and TSDC peaks. Influence of the surface plasma process, which is very popular as anti-static process of a highly insulating polymer film, to the commercially available polymer film is analyzed by this new method. Decrease of some TSDC peaks by the plasma process is observed and their special position can be identified.
Industry Applications Conference, 2004. 39th IAS Annual Meeting. Conference Record of the 2004 IEEE; 11/2004
