Good print quality depends on many factors. In the case of photocopiers and laser printers, it largely depends on the toner. This micro-fine powder produces letters and images on paper with razor-sharp definition. The underlying process is electrophotography, in which the dry toner, or rather the toner particles, are charged. For this purpose, a triboelectric effect can be used. This term denotes the charging of two materials when they come into contact with each other and are subsequently separated. The charged particles are transported in electric fields and transferred to the paper.
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