Charge Reduction on Polypropylene Granules and Suppression of Incendiary Electrostatic Discharges by using a Novel AC Electrostatic Ionizer

Choi, Kwang Seok; Mogami, Tomofumi; Suzuki, Toshisada; Kim, Sung Chul; Yamaguma, Mizuki

doi:10.3850/978-981-07-2518-1_269

Cited by 2 publications

(1 citation statement)

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“…In terms of powder static elimination, Choi et al (2016) has developed a new type of bipolar electrostatic ionizer that can reduce the specific charge of the powder by 85%. Choi et al (2013) has developed a new type of AC electrostatic ionizer, the specific charge obtained by the AC electrostatic ionizer is about 1/8 of that without an AC ionizer. Kodama et al (2002) improved the nozzle‐type static eliminator to eliminate powder static electricity with higher efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of static electricity generation and elimination in the process of food powder screw feeding

Shen

Wang

et al. 2022

J Food Process Engineering

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The static electricity in the powder can easily cause poor packaging accuracy, incomplete heat‐sealing of the packaging bag and certain safety hazards. Therefore, the electrostatic generation and elimination of wheat flour and wheat starch were studied in the process of powder screw feeding. Firstly, taking powder particle size, screw speed and conveying distance as influencing factors, the law of static electricity generation in the process of powder screw conveying is studied. Then, an adjustable DC power supply and an ion fan were used to apply voltage and ion wind during the powder screw feeding process to study the elimination of powder static electricity. The research results show that the electrostatic charge of wheat flour and wheat starch is positive. The greater the screw speed, the more severe the powder collision and friction, and the greater the increase in powder charge‐to‐mass ratio. The larger the conveying distance, the greater the increase in the powder‐to‐mass ratio, and when the conveying distance reaches 5200 mm, the experimental powder‐to‐mass ratio tends to be stable. The gain and loss of the charge of wheat starch with small particle size is obviously greater than that of wheat flour with large particle size. The ability and stability of adding ion wind at the outlet of the screw feeder to eliminate static electricity are obviously stronger than the ability and stability of adding voltage to eliminate static electricity. Practical applications The static electricity generated in the process of screw conveying and feeding causes trouble to the packaging weighing, packaging sealing and safety production of powder. Therefore, this paper studies the electric characteristics of food powder in the process of screw transportation and the influence of various factors on the electrostatic generation law, and also through experiments to compare the two methods of electrostatic elimination. This study provides ideas and references for reducing the generation and elimination of static electricity in the process of screw transportation of food powder, so as to improve the packaging accuracy, packaging quality and reduce safety risks in actual industrial production.

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Section: Introductionmentioning

confidence: 99%

Analysis of static electricity generation and elimination in the process of food powder screw feeding

Shen

Wang

et al. 2022

J Food Process Engineering

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Experimental study on detection of electrostatic discharges generated by polymer granules inside a metal silo

Choi

Mogami²,

Suzuki³

2014

Review of Scientific Instruments

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To detect electrostatic discharges generated by polymer granules within a metal silo, we developed a novel and simple electrostatic discharge detector that utilizes a photosensor. The novel detector consists of a photosensor module in a metal cylinder, an optical band-pass filter, a quartz glass, a power supply, an amplifier for the photosensor module, and a digital oscilloscope. In this study, we conducted experiments at a real pneumatic powder transport facility that includes a metal silo to evaluate the novel detector using polypropylene granules. To determine the performance of the novel detector, we observed the electrostatic discharge within the metal silo using a conventional image intensifier system. The results obtained from the experiments show that the novel detector worked well in this study. The signals obtained with the novel detector were identical to the electrostatic discharges obtained with the conventional image intensifier system. The greatest advantage of this novel detector is that it is effective even when placed under external lights. In addition, the influence of various optical band-pass filters on the performance of the novel detector was discussed. Our study confirmed that an optical band-pass filter with a center wavelength of λ 330 nm (λ1/2: 315-345 nm) was the best performer among the optical band-pass filters used in this study.

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Charge Reduction on Polypropylene Granules and Suppression of Incendiary Electrostatic Discharges by using a Novel AC Electrostatic Ionizer

Cited by 2 publications

References 0 publications

Analysis of static electricity generation and elimination in the process of food powder screw feeding

Analysis of static electricity generation and elimination in the process of food powder screw feeding

Experimental study on detection of electrostatic discharges generated by polymer granules inside a metal silo

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