IQF Freezers — Fluidised-Bed vs Spiral & Procurement Guide
Individually Quick Frozen (IQF) freezers freeze small, uniform product (berries, shrimp, diced vegetables, chicken parts) in seconds to a few minutes, keeping every piece separate. Choice between fluidised-bed, belt and spiral IQF depends on product, throughput and hygiene.
What it is & where it's used
IQF technology freezes individual pieces without agglomeration using cold air at –35 to –40 °C moved at 4–8 m/s across product. Fluidised-bed floats light product; spiral belts handle sticky or coated product; linear belts handle high-volume single-product lines.
- • Vegetable and fruit processors
- • Shrimp, cephalopod and small fish packers
- • Poultry parts and nuggets
- • Ready-to-eat coated products
- • Retail IQF berries and vegetables
- • HORECA shrimp and prawns
- • Coated chicken (nuggets, tempura)
- • Diced fruit for dairy and bakery
- • Free-flowing product for portioning and packaging
- • Very short freezing time preserves texture and nutrition
- • Enables retail-friendly bulk bags
- • High throughput per m²
- • High CAPEX and energy per tonne
- • Product must be uniform size for good fluidisation
- • Coated products require pre-cooling / crust freezing
- • Higher dehydration risk than blast freezing
Typical project sizes: 500 kg/h – 12 t/h continuous throughput.
Fluidised-Bed IQF vs Spiral IQF
| Criterion | Fluidised-Bed IQF | Spiral IQF |
|---|---|---|
| Best product | Light, small, uniform (berries, peas, shrimp) | Sticky, coated, delicate (nuggets, meatballs, fish fillets) |
| Freezing time | 3–12 minutes | 15–60 minutes |
| Investment | USD 350K – 1.4M | USD 700K – 3.5M |
| Footprint | Compact (linear) | High density vertical spiral |
| Hygiene | Easy CIP wash-down | Belt cleaning more complex |
| SEC (kWh/t) | 80–110 | 100–140 |
| Throughput | 1–8 t/h | 0.5–6 t/h |
How to evaluate
- 01Confirm the freezer is designed for your specific product (fluidisation curve, belt loading).
- 02Ask for a trial run on similar product before ordering.
- 03Insist on stainless AISI 304 minimum for food contact and 316 in salt or acid duty.
- 04Verify belt tension system, CIP capability and drainage.
- 05Check evaporator defrost cycle length — every 8–24 h is typical; too frequent = lost production.
- 06Compare specific energy consumption at your actual product loading, not nominal.
- 07Confirm compliance with your export markets (USDA, EU 852/853, HACCP).
Spec checklist
- Product name, size distribution and initial temperature
- Continuous throughput target (kg/h)
- Product loading (kg/m² belt)
- Freezing time and core temperature target
- Refrigerant and evaporation temperature
- Belt material and cleaning system
- CIP / COP requirements
- Defrost method and duration
- Control system and data logging
- Integration with upstream / downstream conveyors
Investment & operating cost
- Compact linear IQF (500 kg/h – 1 t/h)USD 350K – 700K
- Fluidised-bed IQF (1–4 t/h)USD 700K – 1.6M
- Industrial spiral (2–6 t/h)USD 1.4M – 3.5M
Indicative ranges. Actual quotations vary by country, scope, spec, freight and site conditions.
- • Belt width and length
- • Evaporator surface area
- • Refrigerant choice
- • Automation and vision inspection
- • Hygienic design level
- • Crust freezer / pre-chill
- • Vision-based sorting
- • Bag-line integration
- • Metal detection
- • Reinforced insulated slab
- • Vapour-sealed enclosure
- • Refrigerant piping and safety systems
- • Wastewater drainage for CIP
- • 80–140 kWh/t electricity
- • Water for CIP 200–800 L/day
- • Compressed air 6–8 bar for controls
- • Weekly belt inspection
- • Monthly evaporator coil check
- • Quarterly refrigeration PM
Before you request quotations
- Define production goals and daily throughput (kg/day)
- Confirm utilities: power (kVA), water, drainage, compressed air
- Define project scope (turnkey vs supply-only vs hybrid)
- Prepare site layout, floor plan and clear height
- Confirm local regulations (F-Gas, ATEX, HACCP, seismic code)
- Determine financing route (own cash, lease, bank loan, ECA)
- Create technical specification with U-values and setpoints
- Prepare RFQ and shortlist qualified international suppliers
Interactive evaluation matrix
Score each shortlisted supplier on the criteria below. All calculations run locally — nothing is sent to our servers.
| Criterion | |||
|---|---|---|---|
Price / Investment Turnkey CAPEX including installation, controls and commissioning. | |||
Warranty (years) Comprehensive, on major components (compressors, PLC, panels). | |||
Lead time (weeks) Ex-works or delivered to site including customs. | |||
Energy efficiency (SEC / COP) Lower SEC or higher COP is better. | |||
Local service & spare parts Response time, service partner in country, stocked spares. | |||
References / installed base Comparable capacity, region and application. | |||
Maintenance program Preventive maintenance plan, remote monitoring. | |||
Operator training On-site training days, documentation, language. | |||
Expandability Add capacity, modules or additional rooms later. | |||
Lifecycle cost (10y) CAPEX + energy + maintenance + refrigerant cost of ownership. | |||
| Total score | 0 / 50 | 0 / 50 | 0 / 50 |
Common questions
Fluidised-bed or spiral IQF — which one?
Fluidised-bed is optimal for small uniform items (berries, peas, shrimp) with 3–12 min freezing. Spiral is optimal for sticky, delicate or coated items (fillets, nuggets) with 15–60 min freezing. Product type usually decides.
How does IQF differ from blast freezing?
IQF is a continuous line freezing individual pieces in seconds to minutes. Blast freezing is a batch process freezing packaged product cores in hours. Different plant, different capital, different applications.
What throughput is realistic?
Compact linear IQF: 500 kg/h – 1 t/h. Industrial fluidised bed: 1–4 t/h. Large spirals: up to 12 t/h. Design capacity assumes ideal product loading; actual output is usually 70–85%.
Continue your planning
Receive structured, comparable quotations from qualified international suppliers — vendor-neutral. Add financing pre-qualification if the project requires equipment leasing, project loan or ECA-backed facility.
FAQ · Multilingual
Full IQF freezer procurement guide: fluidised bed vs spiral vs tunnel, capacity, dwell time, refrigerant, capex and OEM evaluation.
- Which IQF technology for berries?Fluidised bed — best for small free-flowing product like berries, peas and diced vegetables.
- Typical throughput range?0.5 t/h for small fluidised units, up to 15 t/h for large spiral IQF used in poultry and seafood.