Abstract
Most carrier cores for electrophotography are made from Cu-Zn or Ni-Zn ferrites. But in recent years, environmental experts are now warning that carriers, when placed in waste disposal sites after use, may be contaminating underground water. The experts explain that the nickel, copper, zinc and other hazardous heavy-metal ions disperse from the thrown-away soft ferrite carriers into the soil at waste disposal sites when exposed to acid rain; even if a waste disposal site has a concrete casing that seals itself off from the surrounding soil, heavy-metal ions can infiltrate into underground drinking water through cracks in the concrete. As a result, the use of these materials has been restricted by environmental regulations in many countries. In answer, we have succeeded in developing clean carrier cores that meet the environmental regulations of all countries. These clean carriers can be divided into magnetite and clean ferrites, both of which are produced by FDK's original production techniques. In particular, clean ferrites are new composite magnetic materials that can be designed to suit our customers' specific needs. We are hopeful that clean ferrites will become the main material of electrophotographic carrier cores in the near future.
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