Spiral, Plate & Tunnel Freezers — Continuous Freezing Systems Guide
Continuous freezers are the industrial standard above 1 t/h. Spiral (belt), plate (contact) and linear tunnel (belt/tray) each excel at different products, throughputs and hygiene requirements.
What it is & where it's used
High-throughput industrial freezing systems: spiral (vertical belt at –35 °C, 15–60 min), plate (product between refrigerated plates, 60–240 min at high density), tunnel (linear belt or tray line, seconds to minutes).
- • Ready-meal producers
- • Fish, shrimp and seafood packers
- • Meat and poultry processors
- • Bakery and pastry lines
- • Ice-cream extrusion lines
- • Coated products (nuggets, tempura)
- • Delicate fillets and portions
- • Fish blocks and shatter packs (plate)
- • IQF poultry parts
- • Continuous flow enables inline packaging
- • Best SEC at design load (80–140 kWh/t)
- • High throughput per m² footprint (spiral)
- • High CAPEX and long lead time (18–36 weeks)
- • Belt / drum systems demand skilled maintenance
- • Plate freezers restricted to regular-shape blocks
Typical project sizes: 500 kg/h – 12 t/h spiral; 1–20 t/day plate; 300 kg/h – 6 t/h tunnel.
Spiral Freezer vs Plate / Tunnel Freezer
| Criterion | Spiral Freezer | Plate / Tunnel Freezer |
|---|---|---|
| Best product | Coated, sticky, delicate (nuggets, fillets) | Fish blocks, ready meals in trays (plate); IQF berries (tunnel) |
| Freezing time | 15 – 60 min | 60 – 240 min (plate) / 5 – 20 min (tunnel) |
| Throughput | 0.5 – 12 t/h | 1 – 20 t/day (plate) / 0.3 – 6 t/h (tunnel) |
| SEC (kWh/t) | 100 – 140 | 60 – 100 (plate) / 80 – 130 (tunnel) |
| CAPEX | USD 0.9M – 3.5M | USD 0.4M – 1.8M (plate) / 0.5M – 1.8M (tunnel) |
| Hygiene | Belt CIP required | Plate easy clean / tunnel belt CIP |
| Footprint | Compact (vertical) | Medium (plate) / long (tunnel) |
How to evaluate
- 01Match freezer type to product geometry — spiral for irregular, plate for blocks, tunnel for uniform IQF.
- 02Insist on trial freezing on your actual product before order.
- 03Verify belt tension, tracking and CIP capability (spiral / tunnel).
- 04For plate: confirm plate flatness tolerance and hydraulic clamp force.
- 05Compare SEC at your actual product loading, not nominal.
- 06Confirm compliance with export markets (USDA, EU 852/853, HACCP).
- 07Include commissioning, operator training and 12-month PM in base price.
Spec checklist
- Product type, size, geometry, initial temperature
- Continuous throughput (kg/h or t/h)
- Freezing time and core temperature
- Belt / plate material (AISI 304/316)
- Refrigerant and SST
- CIP / COP capability
- Defrost method and duration
- Integration with upstream / downstream
- Control system and data logging
- Utility requirements (power, water, air)
Investment & operating cost
- Compact tunnel (300–800 kg/h)USD 400K – 900K
- Industrial tunnel (2–6 t/h)USD 900K – 1.8M
- Spiral freezer (1–4 t/h)USD 900K – 2.2M
- Large industrial spiral (4–12 t/h)USD 1.8M – 3.5M
- Contact plate freezer (5–20 t/day)USD 400K – 1.4M
Indicative ranges. Actual quotations vary by country, scope, spec, freight and site conditions.
- • Belt / plate size
- • Refrigerant and SST
- • Hygienic design level
- • Automation and vision
- • Site conditions
- • Crust freezer / pre-chill
- • Vision inspection
- • Automatic bag / carton feed
- • Metal detection
- • Reinforced insulated slab
- • Vapour-sealed enclosure
- • Refrigerant piping and safety systems
- • Wastewater drainage for CIP
- • Electricity 60–140 kWh/t
- • Water for CIP 300–1,500 L/day
- • Compressed air for controls
- • Weekly belt / plate 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
Spiral, plate or tunnel — how to choose?
Spiral: coated / sticky / delicate items with 15–60 min freezing. Plate: regular-shape blocks (fish, ready meals in trays) with high density. Tunnel: uniform IQF product (berries, small shrimp) with short freezing time. Product geometry usually decides.
What throughput is realistic?
Spirals from 500 kg/h to 12 t/h. Tunnels 300 kg/h – 6 t/h. Plate freezers 1–20 t/day. Actual output usually 70–85% of design capacity.
How long is lead time?
18–36 weeks ex-works for large industrial spirals and tunnels. Add 6–12 weeks for installation and commissioning.
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.