Color Sorting Coffee Beans
sorting is frequently used to remove the defective coffee beans that were
not removed during coffee processing or hulling. Many countries
sort coffee beans by hand due to inexpensive labor, but for most
countries investment in a color sorting machine, or color separator, is necessary.
There are several types of color sorting instruments available
on the market produced by two companies: Sortex and Xeltron.
The Color Sorter
The methodology behind color sorting machines
is similar. The color of each coffee bean is quickly measured using
a type of CCD camera system and depending on this wavelength
measurement the bean is either allowed to flow downward or
is shot with a puff of air into the reject pile. Monochromatic
machines remove white and black coffee beans since they have
a lighter or darker hue than the average. The more
specific bichromatic color sorting machines detect and eliminate
coffee beans that are white, unripe, broken, insect damaged, and
For more information about color sorting machines or the process of sorting coffee beans, visit Coffeereview.com or TeaandCoffee.net.