Learn More
The surface-potential-decay measurement techniques are commonly employed for the adjustment of Xerox photography processes, development of electrets, and assessment of polyethylene films for cable insulation. In all these situations, it is important to evaluate the surface charge density and compare it to the limit imposed by the dielectric rigidity of(More)
Surface potential decay (SPD) measurements are considered as the most appropriate technique for the investigation of the corona charging of dielectric surfaces. The aim of the experiments reported in the present paper was to point out the peculiarities of SPD in the case of nonhomogeneous dielectrics, such as the nonwoven fabrics employed for heat,(More)
Fibrous polymers with extremely low electrical conductivity such as polypropylene (PP), polycarbonate, polyurethane, and polyethylene are commonly employed as air-filter materials. The charge accumulated on such materials due to tribocharging effects inherent to the manufacturing process might be harmful either to the operator or to the electronic equipment(More)
Surface potential and electric field measurement techniques are widely used for the investigation of the corona charging of dielectric surfaces in a wide range of industry applications. The aim of this paper is to estimate which of these techniques are the most appropriate for characterizing the charging state of nonwoven fibrous dielectrics and point out(More)
Accumulation of electric charges on insulating surfaces is frequently at the origin of severe electrostatic hazards. The best solution to this problem is to neutralize these charges by the use of ac corona discharges. The aim of this work is to evaluate the efficiency of this process in the specific case of fibrous electrets, by measuring the repartition of(More)
The most widely used techniques for neutralizing the static charge at the surface of insulating bodies make use of the bipolar ions generated in an ac corona discharge. The aim of the present work is to evaluate the efficiency of the neutralization achieved with a corona electrode energized from a generator of sinusoidal, triangular and square ac voltages(More)
— The surface potential decay (SPD) measurement is a commonly-used method for monitoring the charge state of non-woven dielectric media for air filtration applications. The aim of this paper is to evaluate the factors that influence the SPD rate of a specific class of filtering media: " M1 " consisting in two layers of non-woven polypropylene (PP) attached(More)
The aim of this paper is to analyze the corona charging and charge decay of nonwoven fabrics, by using the surface potential decay (SPD) measurement techniques and its (tdV s /dt) versus (log t) representation. Samples of nonwoven polypropylene (PP) fibrous media were exposed to negative corona discharges, using a triode-type electrode arrangement,(More)
The most widely-used techniques for neutralizing the static charge at the surface of insulating bodies make use of the bipolar ions generated in an AC corona discharge. The aim of the present work is to evaluate the efficiency of the neutralization achieved with a corona electrode energized from a generator of sinusoidal, triangular and square AC voltages(More)
Surface potential and electric field measurement techniques are widely used for the investigation of the corona charging of dielectric surfaces in a wide range of industry applications. The aim of the present paper is to estimate which of these techniques are the most appropriate for characterizing the charging state of non-woven fibrous dielectrics, and(More)
  • 1