Dohmeyer Cryo Tunnel

The Dohmeyer Cryo Tunnel is a continuous cryogenic linear tunnel for cooling and freezing, using liquefied nitrogen (LIN) or liquefied CO₂ (LCO₂). It is available in two configurations — a top-lifting design and a bottom-drop / bottom-exhaust design — both delivering class-leading hygiene: there are no seals, the top lifts along the complete length for full cleaning access, and all internal surfaces slope towards the drainage points. Controlled injection of the cryogen, which immediately evaporates, lowers the temperature in the tunnel, while turbulence fans spread the gas to efficiently transfer cold to the product's surface and a bottom exhaust draws cold gas down through the freezing zone to increase efficiency. A servo-driven gearbox provides a wide range of belt speeds, so dwell time can be set from 90 seconds up to 3 hours to suit the product. Cryogenics give you fast, efficient, quality-assured freezing for IQF, crust freezing, cooling, ice glazing and CFU reduction.

Technical Information

ManufacturerDohmeyer (Belgium)
TypeContinuous cryogenic linear tunnel
ConfigurationsTop-lifting and bottom-drop (bottom-exhaust)
CryogenLiquid nitrogen (LIN) or liquid CO₂ (LCO₂)
CapacityUp to 1,500 kg / kg-per-hour (size dependent)
Minimum temperature-110 °C
Widths available28″, 50″ and 62″
Useful belt width630 / 1190 / 1495 mm
Total width1670 / 2230 / 2540 mm
Freezing length6000, 9000 or 12000 mm
Total lengthFreezing length + 1380 mm
Total height2820 mm
Top hood opening750 mm
Residence time90 sec to 3 h (servo-driven belt, length dependent)
ApplicationsIQF, cooling, crust freezing, ice glazing, CFU reduction

Key Features & Benefits

Two configurations — top-lifting and bottom-drop / bottom-exhaust
Top lifts along the full length for easy cleaning access
No seal — tunnel seals without a traditional gasket, removing the risk of bacteriological contamination
All internal surfaces slope towards drainage points
Isothermal profile and heat-transfer efficiency increases capacity by 15%
Bottom exhaust draws cold gas down through the freezing zone, increasing efficiency
Close-controlled cryogen injection with efficient gas-flow management to reduce wastage
Automatic belt cleaning fitted within the freezing zone
Hygienic eye-link belt available (optional) — open structure avoids trapped product
Wide residence-time range via servo-driven gearbox (90 sec to 3 h)
Vacuum-insulated manifold with integrated safety valve for pressure relief
Redundant safety loop providing full back-up to the primary safety circuit
Boundary and deviation temperature measurement to supplement safety and process controls
Full range of sizes available in width and length