Onion Grading Machine | Industrial Onion Sizer

The onion grading machine is designed to sort onions into different size grades for commercial packing, distribution, and further processing. It helps vegetable processing plants, onion packing facilities, and agricultural businesses improve grading consistency, reduce manual sorting, and prepare onions for different market requirements.

GELGOOG provides customized onion grading solutions based on processing capacity, onion size, required grading levels, and downstream packing needs.

What Is an Onion Grading Machine?

An onion grading machine is industrial equipment that separates onions into different categories according to selected grading criteria, such as bulb diameter or weight, depending on the machine configuration.

For onion packing plants and vegetable processors, mechanical grading helps standardize product sizes, improve sorting efficiency, and prepare onions for wholesale distribution, export packaging, and further processing.

Unlike manual grading, an industrial onion grader supports continuous processing and repeatable grading settings. The appropriate machine depends on the onion variety, incoming product condition, required output, and grading specifications.

How Does an Onion Grading Machine Work?

A typical onion size grading process follows three main steps:

1. Feeding: Operators or a feeding conveyor deliver onions to the grading section at a controlled rate.

2. Size sorting: A suitable grading mechanism separates onions according to configured diameter ranges or other specified criteria.

3. Collection: Separate outlets or conveyors direct each grade to the next processing or packing stage.

The exact working principle depends on the selected model. Roller graders, screen graders, and weight grading systems use different mechanisms and serve different grading requirements.

Onion Size Grading vs. Weight Grading

• Size grading: Separates onions by bulb diameter. It suits packing operations that require consistent size categories.

• Weight grading: Separates individual onions by measured weight. It suits applications that require defined weight categories.

• Optical quality sorting: Uses imaging-based systems to identify selected external characteristics or defects when the equipment supports those functions.

Choose the grading method according to your product specifications. Size grading and weight grading are different functions and should not be treated as interchangeable.

Key Features of an Industrial Onion Grading Machine

• Adjustable Grading Specifications : Set grading ranges and output grades to match onion varieties, customer needs, and packing standards. Adjustments depend on the machine.
• Continuous Processing : The machine integrates with feeding conveyors, collection belts, inspection stations, and packing equipment for continuous flow.
• Consistent Size Classification : Mechanical grading reduces batch variation and simplifies preparing different size categories for wholesale, distribution, and export.
• Customized Line Integration : GELGOOG assesses your layout and configures a suitable solution. Optional equipment depends on project requirements.

Applications of Onion Grading Equipment

An industrial onion grader can serve a range of commercial operations, including:

• Onion packing plants: Separate bulbs into marketable size categories before packing.

• Agricultural cooperatives: Standardize onion lots collected from multiple growers.

• Vegetable processing factories: Prepare raw onions for downstream processing.

• Export businesses: Match grading specifications to buyer and destination-market requirements.

• Wholesale distributors: Organize onions into consistent product categories for bulk sales.

The appropriate configuration depends on throughput, onion variety, product condition, and the grading standards required by the buyer.

Frequently Asked Questions About Onion Grading Machines

What is the capacity of an onion grading machine?
Processing capacity varies by machine design, grading method, onion size, and the number of processing lanes. Tell us your target capacity in kg/h or t/h so we can assess a suitable model.

Can an onion grading machine sort onions into different sizes?
Yes. A size grading machine separates onions according to configured diameter ranges. The number of grades and available adjustment range depend on the selected model.

Can an onion grader connect to a packing line?
Yes. A compatible onion grader can integrate with collection conveyors and optional weighing or packing equipment. The final layout depends on your facility and packaging requirements.

Request an Onion Grading Machine Solution

Looking for an industrial onion grading machine for your vegetable processing plant or packing facility?

Contact GELGOOG with your target throughput, grading requirements, and production layout. Our team can evaluate your application and recommend a suitable onion grading or grading-and-packing solution.

Request a quotation to discuss your onion processing requirements and equipment configuration.