Color sorting is a sorting technology of any bulk materials based on the product analysis by color .Recently
this technology has been recognized by many China manufacturers.
Principle of separating by color was developed already in the middle of the past century,while the first color sorter
was installed in London,1947 by English company Sortex.Currently color sorter of various marks and configurations
are produced by a number of companies all over the world,aiming at cutting edge know-how in electronics,optics,
mechanics and pneumatic.These are high-precision machines,being easily operated and making outstanding
sorting results-up to 99.99% of output product purity.
Color sorting is widely used in food industry,especially where visual product control is demanded,like sorting of
cereals,legumes and oil-seeds,nuts,grass seeds and even frozen or dried fruits and berries.Color sorters
successfully meet the needs of non-food industries,like recycling of glass and plastic,as well as sorting of wastes,
salt and minerals.
Standard procedure of sorter’s operation can be described as follows.
Input product is loaded in the sorter via in-feed hopper.With the help of vibration the material flows along the chute to
the distribution channels.Then the product gets into the inspection zone,where it is checked by the high-tech sensors
or CCD-cameras.Cameras ,having received the reflected light from the selected material,generate electric signal for
computer operating system.
Depending on the signals received from the optical system,the computer control system sends the command to
open the pneumatic valve(the ejector)which blows away grains different in color.The good product directly flows into
the goods product hopper.The reject is blown off to the discharging hopper.
Most of the sorters have the re-pass option ensuring more accurate sorting of the grain and minimizing losses
of the good product.