Fresh Onion Processing Line

Fresh Onion Processing Line

Onion pre-processing is the first critical stage for fresh-cut vegetables, prepared foods, fried onion products, and onion powder production. For large food processors handling of fresh onions, increasing labor alone cannot solve peeling efficiency, product consistency, labor costs, and hygiene challenges. したがって, customers can choose a suitable fresh onion processing line based on capacity, onion size, final products, labor conditions, workshop space, and budget. しかし, customers with limited investment budgets can choose a semi-automatic onion processing solution. Currently, for 1,500-2,000 kg/h onion production projects, you can integrate continuous feeding, two-stage peeling, automatic top and root cutting, high-pressure washing, air drying, vacuum packing, and cold storage for higher automation.

  • 容量: 500-2,000 kg/h
  • 力: 6-34 キロワット
  • Occupied Area: 50-160 ㎡
  • Budget: $18,000-$80,000

Who Needs An Industrial Onion Peeling and Washing Line?

An onion peeling and washing line serves many kinds of food factories. In fact, you should choose the onion production line configuration according to the final product you plan to produce. In this way, one onion processing design can support different commercial onion production plans.

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Different Fresh Onion Types for Industrial Manufacturing

☑This onion preparation system is suitable for fresh whole onions with dry outer skins like red, yellow, and white onions needing customizable peeling and washing procedures.

☑加えて, the production line suits onions that need skin removal, root cutting and washing before further processing.

☑Or you can use this design to peel whole onions intended for vacuum packaging or cold storage sale.

☑さらに, you can feedpre-processed onions for subsequent operations such as slicing, dicing, frying, 乾燥, or milling into powder.

Our current top and root cutting equipment commonly handles onions with 6–15 cm diameters. The maximum onion length can reach about 22 cm for this configuration. しかし, our company can customize the cutting system for different onion sizes. Customers can use this onion preparation process before fresh-cut, frozen-food, fried-onion, or dehydration production.

Typical Industrial Customers of Onion Processing System

  • Fresh-cut vegetable plants can use onion peeling and washing equipment before cutting and packing. Central kitchens can process peeled onions for daily meal preparation and ingredient supply.

  • その間, food ingredient manufacturers can cut onion slices, dices, or strips before peeling and cleaning system to serve as ingredients.

  • Frozen food factories can use the onion preparation section before freezing or further cutting.

  • Fried onion producers can connect peeling and washing with slicing, battering, frying, and seasoning.

  • さらに, onion packing plants can connect washing, 並べ替え, vacuum packing, and cold-chain handling.

  • その結果, agricultural processing projects slice or shred clean onions for drying and grinding into onion powder.

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If the client only need to process a small amount of onions daily, a simpler semi-automatic peeling and washing system configuration is a suitable choice. Conversely, customers requiring continuous and multi-shift production can select a higher-automation onion processing solution with automatic feeding, two-stage peeling, automatic top and root cutting, 洗浄, and automatic conveying systems.

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3 Types of Fresh Onion Processing Plan with The Budget of $18,000-80,000

Different clients have different onion production capacity, workshop areas and investment budgets. As a result, we configure each onion processing system in modular stages. さらに, the final quotation changes with the onion size, the peeling requirement and the automation level. These three plans show the price, the floor area and the power for a fresh onion processing line. それから, you can pick the plan that fits your project.

How Does A Onion Peeling and Washing Line Work?

An onion processing procedure turns whole raw onions into clean, peeled material for packing or further production. さらに, the following onion processing procedure separates peeling, waste disposal, trimming, 洗浄, surface drying, and optional packing. したがって, each processing step should prepare onions for the next machine. Customers can adjust individual sections according to onion condition and final product requirements. The following procedure shows how fresh onions move through an industrial preparation system.

  • ステップ 1: 餌やり: The elevator continuously transfers onions from the raw material area into the processing system. A variable-frequency drive can regulate the feeding speed according to stabilize the peeling load.
  • ステップ 2: Brush Pre-peeling: The brush rollers rotate the onions and loosen their dry outer skins. その間, the brushes also remove surface dirt and loose particles.
  • ステップ 3: Pneumatic Peeling: High-pressure air acts on the loose skins while the onions roll forward. その結果, the airflow blows the skins away without damaging the flesh.
  • ステップ 4: Waste Removal: The waste conveyor carries the removed skins away from the main line. As a result, the product flow stays apart from the waste flow.
  • ステップ 5: Manual Sorting: Workers on the sorting platform check each onion for remaining skin, damage, any abnormal raw materials or trimming required.
  • ステップ 6: Top and Root Cutting: The top and root cutter positions and holds each onion. それから, its blades cut the head and the root in one action.
  • ステップ 7: Bubble Washing: Bubbles move the onions inside the water tank and remove remaining dirt. さらに, the spray system rinses the surface before the onions leave.
  • ステップ 8: Air Drying: The parallel air dryer removes free water from the onion surface. As a result, you get dry onions that are ready for cutting, frying, packing and cold storage.
  • ステップ 9: Packing: You can connect vacuum packing and cold storage for selling whole peeled onions. さらに, you can extend the line to fried products or mill onion into powder.

Why Choose Hadof for A Fresh Onion Processing Line?

Our plant offers more than a list of machines. In fact, we design the onion processing system around your product, your capacity and your budget. その結果, you get a line that matches your production conditions.

  • Two-Stage Peeling

    We combine mechanical skin loosening with pneumatic blowing in view of the thin skin characteristic of onions. In fact, this two-stage peeling avoids putting the whole task on one machine. Brush rollers loosen skins first, and compressed air removes them next.

  • Flexible Automation

    You do not need to buy every machine at the beginning. その間, you can choose a manual, semi-automatic, automatic or high-automation onion processing equipment configuration. さらに, this flexibility helps you control onion line investment and labor cost.

  • Independent Waste Flow

    The waste conveyor separates onion skins from the main product route. その上, 餌やり, ピーリング, 並べ替え, 切断, washing and dewatering connect in another one continuous flow. その結果, the production workshop can maintain clearer management and waste handling.

  • SUS304 Construction

    Our core processing equipment commonly uses SUS304 stainless steel for main structures and food-contact parts. しかし, blades, belts, panels, and other components can use different materials according to their functions. 例えば, we use 420J2 blades, PP/PVC/PU belts and PU cold-room panels.

  • VFD Speed Control

    Many conveying and processing stations use variable-frequency drives. したがって, you can adjust the processing speed to match different onion conditions.

  • FAT And SAT Support

    Our reference project includes factory acceptance testing, PLC operation checks, written FAT records, and site acceptance testing. さらに, these steps help buyers verify project scope before routine production.

What Equipment Does An Industrial Onion Processing System Include?

A complete industrial onion peeling and washing line does not rely on a single peeling machine. Instead, multiple machines work together to transform whole unpeeled onions into clean materials ready for packing or further processing. Each machine performs a specific task: feeding equipment ensures stable material supply; peeling equipment reduces manual work; conveyors maintain continuous material flow; sorting equipment improves raw material quality; washing equipment removes impurities; and drying and packing equipment increase product value.

餌やり

ピーリング

Blowing

Waste Collection

仕分け

Trimming

洗浄

Air Drying

Packing

Feeding Elevator

The elevator is the first machine in an onion processing line. It continuously lifts and transfers bulk onions from the feeding area to the next processing stage through a belt or chain conveyor system. したがって, it reduces repeated manual handling and creates a stable material supply. The variable frequency drive (VFD) adjusts the feeding speed to match downstream equipment, preventing overload or idle operation. The power usually ranges from 0.75–2.2 kW depending on capacity, while the lifting height and length can be customized according to your workshop layout.

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Brush Pre-Peeling Machine

The brush peeling machine uses flexible brush rollers to rub, rotate, and loosen onion skins before pneumatic peeling. Its main purpose is not to remove all skins directly, but to prepare onions for the next peeling stage. The brush system uses multiple parallel nylon or PP brushes to loosen the outer dry onion skins. The rotating brushes can also remove surface soil and lift loose skin edges. It just loosens the skin without damaging the onion flesh. したがって, the machine prepares onions for pneumatic skin removal without excessive flesh abrasion.

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Pneumatic Onion Peeling Machine

The pneumatic system uses compressed air to remove loosened onion skins. The chain conveyor moves onions forward while high-pressure airflow sprays from multiple directions to separate the outer skin. Unlike mechanical peeling methods, the air blowing peeling process reduces physical damage because airflow removes the thin skin without cutting into the onion flesh. This dry peeling method avoids water soaking, maintains onion appearance, and supports continuous industrial processing with better product quality.

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Waste Conveyor

The waste conveyor independently handles onion skin disposal and quickly removes peeled waste from the main onion production line. The peeling section collects separated skins through a hopper or collection area, and the conveyor transfers them to a waste zone or collection bags. Hence, the system prevents skin accumulation, avoids contamination of finished products, and keeps the workshop cleaner. The conveyor operates separately from the main processing flow to prevent waste from returning to washing or packing sections. The power usually ranges from 0.37–0.75 kW, with customized length according to capacity.

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Sorting Platform

The sorting conveyor provides an inspection stage after peeling. Operators check onions moving on the conveyor and remove residual skins, damaged onions, soft onions, or foreign materials. Since natural onions vary in size, shape, skin condition, and quality, manual sorting helps maintain consistent feeding conditions for the following processes. As a result, the sorting platform improves the stability of top and root cutting, 洗浄, and packing operations while reducing final product defects. The conveyor width usually ranges from 500–1000 mm, with power of 0.37–1.5 kW depending on configuration.

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トップ & Root Cutter

The onion top and root cutter automatically removes the top and root sections of onions before washing or further processing. The feeding mechanism positions onions, while the holding system fixes them before the cutting blades remove both ends simultaneously. The adjustable blade distance allows the machine to handle different onion sizes. Compared with manual trimming, the automatic cutting system provides higher efficiency, consistent cutting results, and stable production capacity. したがって, it eliminates the bottleneck caused by manual cutting in large-scale onion processing projects.

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Bubble Washer

の bubble cleaning machine combines water movement, bubble agitation, and high-pressure spray cleaning to remove impurities after peeling and cutting. Air bubbles generated at the bottom of the tank create gentle water movement, which makes onions rotate and improves cleaning efficiency. Floating impurities flow away through overflow channels, while heavier dirt settles in the bottom tank. The high-pressure spray system provides additional surface cleaning, and optional ozone sterilization functions can be added. This washing technology provides gentle cleaning without damaging onions. The capacity ranges from 500–2000 kg/h, with power from 2.25–5.2 kW.

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Parallel Air Dryer

の air drying equipment removes free surface water remaining after onion washing. Multiple rollers, conveyors, and airflow systems work together to blow away moisture from surfaces of onions. したがって, the equipment reduces excessive water entering the packing process and helps prevent condensation during storage and transportation. The air dryer creates a cleaner and drier surface condition for vacuum packing, further cutting, or cold storage. It improves packing stability and supports better product quality during distribution.

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Vacuum Packaging Machine

The vacuum packing machine packs peeled and dried onions, including whole onions, onion rings, or diced onions, into sealed bags. The machine removes air inside the package and completes heat sealing, creating a low-oxygen environment that helps reduce oxidation and microbial growth. So, vacuum packing improves product appearance, extends storage stability, and supports cold-chain transportation and export supply. As the final stage of the onion processing line, the packaging system connects fresh onion preparation with commercial product delivery. Customers can choose single-chamber, double-chamber, or continuous vacuum packaging solutions according to production requirements.

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