Labor shortages and rising demand are putting pressure on onion packers. Discover how a big capacity roller grader helps you process more onions with fewer workers.
The global sorting and grading equipment market is expanding rapidly—projected to grow from $4.07 billion in 2025 to $6.75 billion by 2034. Behind this growth is a simple reality: packers everywhere are struggling to keep up with demand using manual labor.
Onions are one of the most labor-intensive crops to grade by hand. Workers must visually sort each bulb by size, inspect for defects, and pack them into bags or boxes—all while maintaining speed and consistency. It's slow, it's inconsistent, and it's getting harder to staff every season.
For onion packers facing peak-season volume, the math doesn't work: more onions coming in, fewer workers available to sort them.
That's why a big capacity grading machine has become essential equipment for commercial onion operations.
What a big capacity grader does for your line
A roller grader doesn't just sort onions—it transforms your entire packing operation. Here's what the right machine delivers:
What You Get | What It Means for Your Operation |
|---|---|
High-volume throughput | Process tons of onions per hour—handle peak harvest without overtime or bottlenecks |
Consistent grading | Every onion is sorted by the same standard, every time—no "good eye/bad eye" variation |
Reduced labor dependence | One machine replaces multiple sorting stations—fewer workers, lower labor costs, less hiring headache |
Direct-to-pack integration | Grade and pack in one continuous flow—eliminate the extra handling step |
Gentle handling | Soft rollers and low-drop transfers protect onions from bruising—less waste, more marketable yield |
A big capacity grader turns your grading line from a bottleneck into a throughput engine.
Why roller graders work so well for onions
Not all grading technologies are right for every crop. For round or oval onion varieties—yellow and white onions, in particular—the roller grader is the natural choice.
Here's why:
The roller design handles onions gently. Each onion rolls between soft-surfaced rollers as it moves down the line. The gaps between rollers gradually increase from one end to the other—small onions drop through early gaps, larger ones continue until they find the right size opening. No squeezing, no dropping from height, no impact damage.
The result: Onions are sorted by diameter with precision, while the gentle rolling action minimizes bruising—a common problem with less carefully designed equipment.
And the capacity speaks for itself. Commercial-scale roller graders process 6–8 tons per hour—enough to keep even the busiest packing line moving during peak season.
Built for real packing house conditions
Fstsort roller graders are designed with the realities of commercial onion packing in mind:
· Variable speed control — Match the grading speed to your onion variety and condition. Delicate varieties? Slow it down. Robust ones? Speed it up.
· Integrated air blower — Removes loose outer skins and debris before they reach the grading section—keeping the line clean and accurate.
· Multiple grade outputs — 4 to 5 size grades simultaneously, so you can serve different market segments from a single run.
· Customizable configuration — Choose just the grader, or add feeding hopper, inspection conveyor, bagging devices, and more.
And because every packing house is different, Fstsort offers flexible layouts—the system adapts to your facility, not the other way around.
Ready to upgrade your onion grading line?
Whether you need a standalone roller grader or a complete washing-grading-packing line, Fstsort can design a solution that fits your volume, your onion varieties, and your facility.
Explore our onion grading solutions →