Electrostatic chargeability

Laser printers and many copiers work by the one-component process, which allows the design of particularly compact machines. The principle of the magnetic brush is retained, however, the toner itself is magnetizable. This can be done by dispersing ca. 30-50 wt.% of black, magnetizable iron oxide particles in thermoplastic resins. Apart from the iron oxide, various additives are generally also incorporated to control the electrostatic chargeability, the flow characteristics and the color. The particle size of these toners is ca. 5-15 pm. 

If low dosed pharmaceutical substances, coloured substances or easily electrostatically chargeable substances are to be mixed in a mortar it is best practice to primarily... 

Plasticizers are reducing the modulus, tensile strength, hardness, density, melt viscosity, glass transition temperature, electrostatic chargeability and volume resistivity of a polymer. In contrast, they are increasing the flexibility, elongation at break, toughness, dielectric constant and power factor (2). 

Here, C0bject is the capacitance and V the voltage between the two metal conductors. The capacitance of typical chargeable components depends on their size, shape, and distance from a grounded surface. For purposes of electrostatic hazard assessment, it is usually convenient to rely upon measured data like that in Table 6. 

Table I summarizes the experimentally determined resistivity characteristics for the nine formulations investigated. On the basis of Equation 6 and these data, a high degree of spray charge-ability by the electrostatic induction process could be predicted for all the pesticide samples tested. For these particular pesticide formulations, laboratory spray tests confirmed excellent droplet charging to greater than 10 mC/kg. Similar electrical resistivity measurements will serve as a suitable predictor of the chargeability of other formulations of interest in the electrostatic pesticide-spraying process.

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