A green onion drying machine is industrial continuous drying equipment that removes moisture from washed and cut green onions before packaging and export. The machine featured on this page is Shuliy’s mesh belt dryer, a multi-layer stainless steel conveyor system that carries green onion slices through controlled hot-air zones. Standard models process 120 to 600 kg of fresh green onions per hour, with custom lines reaching several tons per hour for large-scale processors.
Fresh green onions contain roughly 89–92% moisture and wilt within days after harvest. To produce shelf-stable dried green onion flakes and rings, moisture must be reduced to 5–8% while keeping the bright green color and pungent aroma buyers pay for. Sun drying cannot deliver this quality. A green onion dryer completes the process in 1–3 hours with full color retention and zero weather risk.
Shuliy has manufactured drying equipment for over 15 years and exports to 30+ countries. Every green onion drying machine is backed by layout design, installation support, and a one-year warranty with lifetime technical service.
Green Onion Drying Machine Technical Parameters
| Model | Belt Width | Drying Length | Layers | Capacity (kg/h) | Total Power (kW) |
|---|---|---|---|---|---|
| SL-1.2-8 | 1.2 m | 8 m | 4 | 60–160 | 11.4 |
| SL-1.6-10 | 1.6 m | 10 m | 5 | 95–250 | 13.6 |
| SL-2-10 | 2 m | 10 m | 5 | 120–300 | 15.8 |
| SL-2-20 | 2 m | 20 m | 10 | 240–600 | 36.8 |
Standard machines are 6–12 m long with 4–6 layers. Custom lengths up to 19 m and multi-unit lines are available for higher output.
Configuration Options
| Item | Options |
|---|---|
| Heat source | Heat pump / Natural gas / Diesel / Coal / Biomass / Steam / Electric |
| Belt material | 304 stainless steel mesh (food-grade) |
| Control system | PLC touchscreen, temperature / humidity / belt speed control |
| Feeding | Manual hopper or automatic vibrating feeder |
| Voltage | 220V / 380V / 415V / Custom |
Why Processors Choose an Industrial Green Onion Dryer?
Dried green onion flakes and rings are a high-demand ingredient for instant noodle, seasoning, and food-service industries. Processors face three persistent problems without a proper green onion drying machine:
- Color loss: Overheated onions turn yellow-brown and sell at a 30–50% discount.
- Mold during rainy season: Field drying fails for days, and entire loads are lost.
- Inconsistent moisture: Mixed wet and dry pieces cause mold inside sealed bags.
An enclosed industrial green onion drying machine solves all three with zone-controlled temperature, continuous hot-air circulation, and automatic dehumidification.
How Does the Green Onion Drying Machine Work?
Step 1: Washing and Cutting
Fresh green onions are washed, root and tip trimmed, and cut into 3–10 mm rings or slices. A vibrating dewatering screen removes surface water before drying.
Step 2: Automatic Feeding
Cut onions are spread evenly on the stainless steel mesh belt at a layer thickness of 10–25 mm. An automatic feeder keeps the layer uniform for even airflow.
Step 3: Multi-Zone Drying
The belt carries onions through independent temperature zones:
| Zone | Temperature | Function |
|---|---|---|
| Zone 1 | 50–55°C | Preheat, remove surface water gently |
| Zone 2 | 60–65°C | Main dehydration, maximum moisture removal |
| Zone 3 | 55–60°C | Deep drying, protect green color |
| Zone 4 | 45–50°C | Cooling and moisture balance before discharge |
Total drying time is 1–3 hours, depending on slice thickness and initial moisture. Temperatures above 70°C are avoided because they destroy chlorophyll and turn the product yellow.
Step 4: Cooling and Discharge
Dried onion flakes exit through a cooling section, then drop into collection bins for sorting and moisture-proof packaging.
Key Features That Protect Color and Aroma
Food-Grade 304 Stainless Steel
All onion-contact surfaces, including the belt, chamber walls, and baffles, use 304 stainless steel. This prevents rust contamination and meets export food-safety standards.
Precise Zone Temperature Control
Each zone holds its set temperature within ±1°C via PLC control. This precision is what keeps green onions green instead of yellow.
Forced Hot-Air Penetration
High-volume fans push air through the onion layer from above and below. Thin slices dry evenly without manual turning.
Multi-Layer Space-Saving Design
Stacked belts multiply capacity inside a compact footprint. Onions transfer between layers automatically, which also improves uniformity.
Flexible Heat Sources
Choose heat pump, gas, biomass, coal, steam, or electric based on the cheapest fuel available at your factory.
Continuous 24-Hour Operation
Fresh onions enter one end, dried flakes exit the other. One operator runs the entire line.
What Else Can This Machine Dry?
The same green onion drying machine handles a wide range of similar vegetables by adjusting temperature and belt speed:
- Spring onion, scallion, chives, leek
- Onion slices and granules
- Garlic slices and ginger
- Carrot dices and cabbage shreds
- Spinach, celery, and other leafy greens
- Chili and bell pepper strips
This versatility lets processors run different products across harvest seasons with one line.
Customer Pain Points & Solutions
| Pain Point | Shuliy Solution | Result |
|---|---|---|
| Green onions turn yellow when dried | Zone temperatures capped at 65°C | Bright green flakes, premium grade |
| Rainy-season drying losses | Fully enclosed continuous dryer | Zero weather-related spoilage |
| High labor for manual turning | Automatic belt conveying | 1 operator per shift |
| Uneven moisture in bags | Uniform 10–25 mm spreading + multi-zone airflow | Consistent 5–8% final moisture |
| Expensive electricity | Biomass, gas, or heat pump options | Lowest running cost locally |
| Small factory footprint | Multi-layer vertical design | Higher output in limited space |
Case Example: Green Onion Processing Project
A vegetable processing company in Southeast Asia upgraded from solar tunnels to an SL-2-10 green onion dryer with gas heating. Before the upgrade, rainy-season losses reached 25% of harvest, and color downgrades cut selling prices by nearly half.
After commissioning, the company achieved:
- Stable 5–8% final moisture in every batch
- Bright green flakes accepted by instant-noodle buyers
- 24-hour continuous operation, doubling daily output
- Labor reduced from 8 workers to 1 per shift
The machine paid back its investment within one harvest season.
Why Buy a Green Onion Drying Machine from Shuliy?
- 20+ years of drying equipment manufacturing experience
- Exported to 30+ countries across Asia, Africa, and the Americas
- Capacities from 60 kg/h to 14,000 kg/h
- Food-grade 304 stainless steel construction
- PLC automatic control with remote monitoring option
- Multiple heat sources matched to local fuel prices
- 1-year warranty and lifetime technical support
- Free layout design and pre-purchase drying test
Frequently Asked Questions
Can the machine dry green onions with the white part and green part together?
Yes. Both parts dry at the same curve, though the thicker white stem may need slightly longer drying. Uniform 3–10 mm cutting solves most thickness differences.
Is blanching required before drying green onions?
Blanching is optional. Most processors dry directly after washing and cutting to preserve aroma. Blanching at 90°C for 30–60 seconds can fix color further for premium export orders.
What is the moisture content of the dried product?
Standard dried green onion flakes are 5–8% moisture, suitable for 12–18 months of sealed storage.
What heat source do most green onion factories choose?
Gas and heat pump are most common in Asia; biomass is popular where agricultural waste is free. We calculate running costs based on your local fuel prices.
How long does delivery and installation take?
Standard models ship in 15–25 days. Installation typically finishes within 3–5 days with our online or on-site guidance.
Can one line also dry regular onions and garlic?
Yes. The same belt dryer handles onion, garlic, ginger, carrot, and chili with simple temperature and belt-speed adjustments.
Do you provide a drying test before purchase?
Yes. Send us your green onion samples, and we will return a video-recorded test report with color, moisture, and yield data.
Get a Quote for Your Green Onion Drying Machine
Whether you need a 120 kg/h starter line or a multi-ton industrial system, Shuliy can configure the right green onion drying machine for your capacity, fuel source, and product grade target.
Contact us today for a free layout design, drying test report, and detailed quotation.
