Roller graders revisited
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Graders with rollers will quickly and accurately grade most products (fruits, vegetables or nuts) by size and is extremely gentle with the products.

Roller graders or sizers, delicate products

Sizers or graders using moving and turning rollers for very delicate products

The graders (sizers), shown here, are very versatile, classifying almost all products (fruits, vegetables, tubers, nuts, strawberries, etc.). It is so delicate with the product that it also sorts mature tomatoes without breaking them.

The turning rollers carry the product from one side of the grader to the other and during this movement the distance between the rollers increases continuously. The results is that the smaller products falls between the rollers in the beginning and the biggest product comes out at the end.

Perpendicular under the rollers small conveyor belts are placed that receive the different sizes.

The number of sizes these kind of graders can grade depends on the number of the small conveyor belts.

These graders have two minor drawbacks:

  1. Changing the rollers (you need different rollers for different shaped products)
  2. Adjusting the sizes to grade.

These two tasks are a bit uncomfortable.

Roller sizer

The rollers of a roller sizer

Exits of a roller sizer or grader

A roller sizer (grader) with 4 exits for 4 product sizes.

Depending on the shape of the product to be sorted, suitable rollers are chosen.

sizing peaches

grading peaches

grading apples

grading apples

Rollers in form of a V

Specially shaped rollers

Rollers covered with rubber

Rollers covered in rubber, for softer treatment of delicate products

To get a better understanding how these graders work, watch the movies.

Grading ripe tomatoes

grading onions

grading yame

grading peppers

It grades also peaches, ripe tomatoes or any other delicate fruit.

A disadvantage of this system is changing the rollers or changing the, by the client requested but in the factory set grading sizes. This can be sometimes a bother.


To mechanise your post harvest processes:
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