Global Solutions for the Food Industry

Commercial Onion Rings Production Line

Raw Onion Sorting → Washing → Topping & Tailing → Onion Peeling → Slicing → Ring Separating → Bubble Washing → Air Drying → Predusting → Battering → Breading → Continuous Frying → Vibratory De-oiling → Air Cooling → Seasoning Drum → IQF Quick Freezing → Inspection Sorting → Metal Detector → Automatic Weighing & Packaging
 

Standard Parameter Settings for Each Process

 
  1. Raw Onion Sorting
     
    Manually remove rotten, sprouted, damaged onions; keep fresh round onions only.
     
  2. Bubble Washing
     
    Water temperature: normal temperature
     
    Belt speed: adjustable medium
     
    Function: remove soil, impurities and loose skin
     
  3. Topping & Tailing Cutting
     
    Cut off onion root and stem ends uniformly, ensure flat cutting surface.
     
  4. Onion Peeling
     
    Fully remove outer dry skin; no skin residue left on onion flesh.
     
  5. Slicing
     
    Slice thickness: 8–12 mm
     
    Even thickness, no broken slices
     
  6. Ring Separating
     
    Vibrating separation: separate stuck onion rings one by one, no adhesion.
     
  7. Secondary Bubble Washing
     
    Clean residual onion peel and impurities again.
     
  8. Air Drying
     
    Strong air blower, remove surface water completely;
     
    no free water before coating (ensure coating adhesion).
     
  9. Predusting
     
    Material: compound flour & starch mix
     
    Thin even dust layer on onion ring surface.
     
  10. Battering
     
    Batter concentration: moderate viscosity, hang well without dripping too fast
     
    Coating: full coverage of onion ring surface
     
  11. Breading
     
    Coat uniform bread crumbs; full wrapping, no exposed gaps.
     
  12. Continuous Frying
     
    Oil temperature: 155–165℃
     
    Frying time: 2.5–4 min
     
    Keep oil clean with automatic oil filtering circulation.
     
  13. Vibratory De-oiling
     
    Vibration remove excess surface oil; time: 30–60s.
     
  14. Air Cooling
     
    Cool to 25–30℃; lower product core temperature before freezing.
     
  15. Seasoning (Optional)
     
    Rotary seasoning drum: evenly add salt, pepper, sour cream onion flavor, BBQ flavor as required.
     
  16. IQF Tunnel Freezing
     
    Freezing temperature: -35℃
     
    Quick freeze to core temperature below -18℃, keep individual non-sticky.
     
  17. Artificial & Machine Sorting
     
    Pick out broken, deformed, discolored onion rings.
     
  18. Metal Detection
     
    Detect metal foreign matter; reject unqualified products automatically.
     
  19. Automatic Weighing & Packaging
     
    Fixed weight bag/box packing, sealing tightly; ready for cold storage and delivery.
     
 

Production Line Basic Standard

 
  • Output capacity: 500–5000 kg/h optional
  • Operators needed: 3–6 persons
  • Finished product: frozen pre-fried onion rings for supermarket & food service.
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