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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.
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:
These two tasks are a bit uncomfortable.
The rollers of a roller sizer
A roller sizer (grader) with 4 exits for 4 product sizes.
Specially shaped rollers
Rollers covered in rubber, for softer treatment of delicate products
Grading ripe tomatoes
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:
+1 239 3002374
or use our (preferable)
our contact form
Address: Farm San Isidro, Volcán, Panama.