The ink used in EP printers, known as toner, includes a polymer to create a thermal connection between the toner and the substrate, the pigment (generally carbon black) to create color, the charge control agent (such as magnetite, Fe3O4), the additive Flow control (such as fumed silica) and wax to prevent the toner from sticking to the thermal roller.
In general, the physical properties of toner particles play a key role in determining the quality of digital printing. Homogeneous toners with optimal shape and particle size can be produced through new methods that allow an accurate control of the final properties, while in conventional methods, generally based on mechanical grinding, to achieve particle size distribution, small particles and homogeneous forms have been inappropriate.
A solution to this problem is the use of chemically produced toners. In contrast to the mechanical method, CPT toners based on particles of nanometer size are synthesized by chemical methods such as suspension polymerization, chemical crushing, or emulsion accumulation, which will be described in detail below.
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