The Dry Mill Project

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Milling Machinery

DMP 2.05 Optical Sorter (Visual defects)

Here are some key points Hugo makes about optical sorters in this video, plus a bit of historical into too.

Purpose

  • Electronic sorters are also known as optical sorters or colorimetric sorters.
  • They are used to remove defective beans that can’t be separated by density or shape.
  • These machines complement gravity/densimetric sorting methods.
  • They detect and remove beans based on their colour, not their physical size or weight.
  • Help ensure higher cup quality by eliminating:
    • Black beans
    • Green (immature) beans
    • Sour beans

Process

  • Beans are poured into top trays of the machine.