2014 Annual Meeting of The Institute of Electrostatics JapanHiroshima International University
September 7-8, 2014

9pD-1
September 9th (Tue.), <14:00-15:00>
Room 3

Experimental study on influence of air applied toelectrostatic field sensor on electrostatic field measurement○

Naoto NOGERA*, Teruo SUZUKI*, Kwangseok CHOI** and Mizuki
YAMAGUMA **○*Kasuga Denki Co., Ltd., **National Institute of Occupational Safety and Health,Japan

Abstract:
Electrostatic charges and/or discharges on powders bring about ignitionand explosion of powders. Electrostatic problems on the powder must be takencare of in the industry. We have developed an electrostatic field sensor whichmeasures electrostatic hazards. The electrostatic field sensor was supplied withcompressed air in order to protect powder particles from getting into the sensor.
This paper is related to how the compressed air affects the performance of theelectrostatic field sensor. As a result, the performance of the electrostatic fieldsensor was affected by the compressed air. Namely, the experimental values
and theoretical values was not the same. That is because movement of thecoppers inside the electrostatic field sensor was disturbed by the compressed air.

2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-2
September 9th (Tue.), <14:00-15:00>
Room 3A study on performance of electrostatic filed sensor attachedto loading pipe of pneumatic powder transport facility○Naoto NOGERA*, Teruo SUZUKI*, Kwangseok CHOI** and Mizuki
YAMAGUMA **○*Kasuga Denki Co., Ltd., **National Institute of Occupational Safety and Health,Japan

Abstract:
have developed an electrostatic field sensor which measureselectrostatic hazards generated from charged powders. This paper is a report on
the performance of the electrostatic field sensor using pneumatic powdertransport facility and 300 kg of polypropylene powder. An electrostatic fieldsensor was attached to the end of the loading pipe inside the silo. As the result,the electrostatic field meter generally performed, as expected. The measured
values obtained from the electrostatic field meter were similar to those whichwere transferred from charge-to-mass ratio, obtained from the Faraday cage
method. However, some data was affected by modification method of theelectrostatic field sensor before use. Several interesting data were also obtainedand discussed.

2014 Annual Meeting of The Institute of Electrostatics JapanHiroshima International University
September 7-8, 2014

9pD-3
September 9th (Tue.), <14:00-15:00>
Room 3Charge neutralisation from the side surface of an insulatingplateA. Ohsawa
National Institute of Occupational Safety and Health

Abstract:
This work is a response to a comment, ‟Is the charge neutralisation fromthe side surface of a thin insulating object available?”, given at the 14thInternational Conference of Electrostatics in Budapest, 17--19 April 2013. We
investigate the phenomena of this charge neutralisation using 2-D
electrohydrodynamic simulations. Results of a preliminary simulation with aninsulating plate of which both the upper and lower surfaces are initially charged
at 1 µC/m^2 are presented in this report2014 Annual Meeting of The Institute of Electrostatics Japan
Hiroshima International University
September 7-8, 2014

9pD-4
September 9th (Tue.), <14:00-15:00>
Room 3

Basics properties of grid type charge control device
Takahisa KIMURA
Yamagata University*． KASUGA DENKI.INC**

Abstract:
To evaluate the state of paint curing quantitatively, we proposed new
paint curing sensor with a grid type charge control device. The device cancharge up the painted material to measure the charging up velocity dependingon the state of paint curing. After the measurements the static charge of thematerial should be eliminated immediately. In this study, we propose charging up
and chare elimination model of the proposed devise. The basic characteristic of
this device was also investigated experimentally. It was found that tendency ofthe experimental results agree with the theory devised from the model.