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Colour sorter

Also called: color sorter, color sorter machine, rice color sorter, optical sorter, rice sorting machine

Step 7 of 8: Grading and sorting

Cameras look at every grain as it falls, and short puffs of air blow out the discoloured, chalky and foreign ones.

Availability subject to feasibility check

Prices depend on the specification and the supplier. Request a quote.

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Example of a Colour sorter
Example of this machine type, not a specific model we supply.Photo: RustyPhoton, CC BY-SA 4.0, commons.wikimedia.org, edited

Colour sorter: how it works

  1. A vibrating feeder spreads the rice into a thin stream that slides down sloping chutes.
  2. As the grains fall past bright lights, cameras look at every grain from the front and the back.
  3. The computer compares each grain with the colour and shape it was taught to accept.
  4. A fast air valve fires a short jet that knocks the rejected grain out of the stream into a separate channel.
  5. Good rice falls straight on; the rejects are usually sorted a second time to recover good grains.

Main types

Chute-type colour sorter
Grain slides down channels past the cameras. The usual type for rice; it is sized by the number of chutes.
Belt-type colour sorter
A belt carries the product under the cameras. For fragile or irregular products such as nuts, dal or tea.
By camera: colour, infrared and shape
Full-colour cameras see shades; infrared sensors find glass and stones of the same colour as rice; shape sorting removes brokens.

Where it fits in the process

It is the last quality step, after grading and before packing. It needs a steady supply of clean, dry compressed air.

Colour sorter price in Bangladesh: how to get a quote

We do not publish prices. The price of a machine depends on its specification, the supplier and the shipping terms, and it changes with the market. Tell us the points below: we check feasibility and the import rules, then send you a quotation.

What to tell us

  • What you sort: raw rice, parboiled rice, or also dal, wheat or other products.
  • How much rice passes in an hour.
  • What you need removed: discoloured and chalky grains, stones and glass, brokens.
  • The air compressor and dryer you have.
  • New or reconditioned.
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Common questions

How does a rice colour sorter work?

Cameras photograph each falling grain, a computer decides in a fraction of a second whether its colour is acceptable, and a jet of compressed air blows out the grains that are not. Good rice is never touched.

What can a colour sorter remove from rice?

Black, yellow, red and chalky grains, grains with spots, unhusked paddy, and foreign matter such as stones, glass and plastic. What it catches depends on its cameras: stones and glass the colour of rice need infrared sensors.

What is the price of a rice colour sorter machine in Bangladesh?

We do not publish prices. The price depends on the number of chutes, the kind of cameras and sensors, and whether the machine is new or reconditioned. Send us the points listed above and we will quote.

More machines in this step: Grading and sorting

  • Length grader

    A turning cylinder lined with small pockets that lift out broken grains, so whole and broken rice can be packed separately.

    Availability subject to feasibility check

    Request this machine