Factors that influence the corona charging of fibrous dielectric materials

Liu

J of Applied Polymer Sci

et al. 2017

In recently years, fine particulate matter (PM) pollution has drawn worldwide attention due to its serious threat to public health, visibility, climate, and ecosystems. The electret filter that can significantly improve the filtration efficiency without increasing the pressure drop has been widely used to for PM filtration. However, there were still some blind spots in the corona charging process, such as the interaction effects between the charging factors on the electret performances and the electric spark phenomenon during charging, which generate challenges for further improving the electret performance. Herein, we report an inconspicuous charging phenomenon that a blue‐colored glow was observed during corona charging process. We named it as “Waterfall glow”, because a lot of charges appear to flow. The relationship between the blue‐colored glow and the filtration efficiency was investigated. The results showed that the filtration performance of the electret melt blown was positively correlated to the intensity of blue‐colored glow. The phenomenon enables us to online predict the filtration performance of the electret material in the actual production. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45948.

Section: Introductionmentioning

confidence: 93%

Online prediction of the filtration performance of polypropylene melt blown nonwovens by blue‐colored glow

Liu

J of Applied Polymer Sci

et al. 2017

Journal of Macromolecular Science, Part B

“…Recently, some researchers have studied the effect of positive and negative corona-charging of a PP nonwoven media and indicated the factors that influence the corona charging of PP fibrous dielectric materials. [7,8] The results showed that the optimal charging effect occurred at a charging voltage of 25 kV. Increase in charging voltage and charging time reduces the surface resistance.…”

Section: Introductionmentioning

confidence: 94%

Effects of Tourmaline Particles on Structure and Properties of Polypropylene Filtration Melt-Blown Nonwoven Electrets

Han

et al. 2012

Polypropylene (PP) melt-blown electret webs were melt-spun by melt-blown processing of PP and PP/filler composites. The effect of tourmaline particles on the structure, morphology, and mechanical properties of PP melt-blown webs is reported. The meltblown webs were characterized by differential scanning calorimetry, wide-angle x-ray diffraction, scanning electron microscopy (SEM), and pore size meter. The crystallinity of melt-blown webs with tourmaline particles was more than that of PP alone. SEM micrographs revealed good dispersion of the additive in the fiber webs. The tourmaline particles offered some benefits to the mechanical properties of the melt-blown web. Melt-blown web samples with tourmaline had larger pore size, high surface charge density, higher filtration efficiency and stability of filtration efficiency.

2015 IEEE Industry Applications Society Annual Meeting

“…[29] - [34]. The corona charging can be done by using different electrode configurations [35] - [37].…”

Section: Introductionmentioning

confidence: 99%

Comparison between the surface-electric-potential characteristics of tribo- and corona-charged polymers

Prawatya

Neagoe

Zeghloul

et al. 2015

Self Cite

The ability of polymers to acquire and retain electrostatic charges is valued in designing new equipment like electrostatic separators, electret filters and powder coating devices. Several recent studies have pointed out the beneficial effect of electric charges on the lubricated contacts. The aim of this paper is to compare two physical mechanisms of electric charging of polymers: triboelectric effect and corona discharge. The experiments are performed with 5-mm-thick samples of polystyrene (PS), poly-vinyl-chloride (PVC) and polypropylene (PP). The cartography of the electric potential is made using the capacitive probe of an electrostatic voltmeter. The tribocharging is done by back and forth movement of two polymer plates in conformal contact with each other (speed: 7 to 30 mm/s; constant normal force: 2 N). Uniform corona charging is performed by moving the sample in the space charge zone generated by a wire-type high-voltage electrode, used in a triode configuration, with the potential of the grid electrode set at 0.5 kV, 1 kV and 2 kV. The electric potential at the surface of tribocharged polymers is less uniform and decays faster than that of corona-charged samples.