Food Size Grader Machine Manufacturers
Connect with verified food size grader machine manufacturers on Towobo. Source roller graders, vibrating screens, trommel screens, and diverging roller size separators for commercial fresh produce, nut, seed, grain, and food ingredient size grading.
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Browse Food Size Grader Machine Suppliers →Food size grading machines — types and applications
Size grading separates a product stream into size fractions based on physical dimensions. The main size grading machine types for food applications are: diverging roller graders (pairs of diverging rollers that are spaced progressively wider along the machine — small items fall through the gap when it matches their diameter; large items travel to the end; standard for citrus, mangoes, apples, and other round or oval fruit); vibrating screens (flat or inclined mesh screens that vibrate — undersize material falls through the mesh aperture; oversize is retained; suitable for grains, seeds, nuts, and cut vegetable pieces); trommel screens (a rotating cylindrical screen — small material passes through the screen perforations; large material exits from the open end of the drum; suitable for potatoes, onions, and root vegetables); and sieve graders (multi-deck vibrating sieves with progressively finer apertures — standard for grain and seed sizing into multiple fractions in one pass). The choice of size grading technology depends on the product shape, the required number of size fractions, and the throughput.
Frequently asked questions
How many size grades can a roller grader produce in one pass?
A diverging roller grader separates the product into multiple fractions as the gap between the rollers increases along the machine length. The number of fractions is determined by the number of collection belts or chutes positioned under the roller gaps — typically 4–8 fractions are separated in a single pass through the machine. For fresh produce where more fractions are needed, two graders in series or a longer single grader with more collection points can be used. The gap settings (the size boundary between each fraction) are adjustable to match the buyer's grade specification. Regular calibration of the roller gaps using reference spheres of known diameter ensures that the actual sorting boundaries remain within the specified tolerances.
What is the difference between size grading and weight grading for fresh fruit?
For round or near-spherical fruit, size (diameter) and weight are correlated — a larger diameter fruit is heavier — so size and weight grading produce similar results. However, for irregular-shaped fruit (mango, avocado, pear), the relationship between diameter and weight is more variable — a fruit that passes a roller gap of a given width may vary significantly in weight depending on its length and shape. Many modern fresh produce packing lines use weight grading rather than size grading for irregular-shaped fruit because weight is the variable most directly specified by retail buyers. For round fruit (apples, citrus, peaches), size grading by roller is fast, accurate, and lower cost. For premium export lines, a combination grader that measures both diameter and weight (or uses computer vision to estimate volume) gives the most precise grading.
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