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Length grader

Also called: rice grader, rice grader machine, rice grading machine, indented cylinder grader, broken rice separator

Step 7 of 8: Grading and sorting

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

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

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Example of a Length grader
Example of this machine type, not a specific model we supply.Photo: Supplier listing, used with permission, rice-processing.com, edited

Length grader: how it works

  1. Rice flows into a slowly turning cylinder whose inner wall is covered with small pockets.
  2. Broken grains fit into the pockets and are lifted as the cylinder turns.
  3. Near the top they fall out into a trough, and a screw carries them away.
  4. Whole grains are too long for the pockets; they stay at the bottom and run out at the end.

Main types

Indented cylinder (length) grader
Sorts by length. Several cylinders in a row give head rice, large brokens and small brokens.
Rotary sifter
Flat sieves moving in a circle take out small brokens and tips before the cylinders.
Thickness grader
A slotted drum that removes thin, immature grains.

Where it fits in the process

It follows whitening and polishing. Whole rice goes on to the colour sorter, and the brokens are collected to be sold separately or blended back in a set share.

Length grader 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We do not publish prices.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

  • The rice: long, medium or short grain, raw or parboiled.
  • How much rice passes in an hour.
  • How many grades you want to separate.
  • Whether you also need a sifter or a thickness grader.
  • New or reconditioned.
Request a quote

Common questions

What does a rice length grader do?

It separates broken grains from whole grains by their length. The mill can then sell whole rice at its full value, sell the brokens as a separate product and control exactly how many brokens are in each grade.

How does an indented cylinder separate broken rice?

The pockets in its wall are just deep enough to hold a short grain. Short grains ride up in the pockets and drop into a trough; long grains cannot sit in a pocket, so they slide back and leave at the end.

What is the price of a rice grader machine in Bangladesh?

We do not publish prices. The price depends on the number of cylinders, how much rice it must grade in an hour 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

  • Colour sorter

    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

    Request this machine