The Dohmeyer Top Lifting Tunnel provides flexibility and efficiency for your production process. It has been designed with class leading hygiene features such as the elimination of seals, that the top lifts along the total length of the tunnel, thus giving easy access for cleaning and that all the internal surfaces are sloped towards the drainage points.
Wide range of sizes available
In the demanding food processing industry, achieving high-volume throughput without sacrificing product quality is the ultimate goal. The Dohmeyer Cryo Tunnel is engineered to deliver continuous, large-scale cryogenic freezing, reaching production capacities of up to 1,500 kg per hour. Utilizing the extreme cooling power of liquid nitrogen (LN₂) or carbon dioxide (CO₂), this system achieves ultra-fast thermal exchange that forms only micro-crystals within the cellular structure of the food. This rapid freezing process perfectly preserves natural moisture, weight, texture, and flavor, effectively eliminating the heavy drip losses and dehydration typically associated with mechanical freezers. Highly versatile, the Cryo Tunnel is the benchmark solution for Individually Quick Frozen (IQF) applications, seamlessly processing a wide range of products including raw meat, poultry, delicate seafood, vegetables, and ready meals. By guaranteeing rapid temperature reduction, the tunnel locks in premium quality while continuously supporting demanding, high-speed industrial production lines.
Operational profitability in cryogenic processing depends heavily on the efficient utilization of cooling energy. The Dohmeyer Cryo Tunnel incorporates advanced thermodynamic engineering to minimize cryogen waste and lower operational costs (OPEX). A key feature is its innovative bottom exhaust system, which actively draws cold gas downward through the product freezing zone, dramatically increasing the efficiency of the thermal exchange. Furthermore, the tunnel features an isothermal design that improves overall heat transfer efficiency, effectively increasing the freezing capacity by 15%. This is paired with a close-controlled injection system matched with intelligent gas flow management, ensuring that every drop of cryogen is utilized to its maximum potential. Compared to conventional mechanical freezing, which requires massive compressor rooms and long freezing times, this optimized cryogenic approach significantly reduces the required factory footprint while delivering a rapid return on investment.
Operating with ultra-low temperature cryogens requires a rigorous, uncompromising approach to industrial safety. Dohmeyer has equipped the Cryo Tunnel with a sophisticated, multi-layered safety architecture designed to protect facility personnel and ensure secure operations. At the core of the cryogen delivery network is a vacuum-insulated manifold featuring integrated safety valves directly within the inlet pipework. This design provides immediate pressure relief back to the main storage tank if abnormal conditions occur. Additionally, the tunnel is fortified with an N+1 redundant safety loop—an independent secondary system that provides a full backup to the primary safety circuit, guaranteeing safe shutdowns even in the event of a sensor failure. The system also includes advanced boundary and deviation monitoring, utilizing liquid detection and precise temperature sensors at the edges of the freezing zone. These robust protocols allow plant managers to confidently deploy cryogenic technology.
Eliminating the risk of microbial contamination is a non-negotiable requirement for modern food processors. The Dohmeyer Cryo Tunnel sets the industry benchmark for sanitation through its rigorous "clean-by-design" construction. Unlike mechanical freezers that harbor bacteria in complex ductwork, this tunnel features an innovative top-lifting mechanism that elevates along the entire length of the unit, granting operators unimpeded access for thorough cleaning. The internal architecture utilizes fully welded, sloped surfaces directing wash water strictly to drainage points, preventing any standing liquid. Crucially, the tunnel seals effectively without the use of traditional gaskets, entirely removing a common trap for bacteriological contamination. To further minimize cleaning downtime, the unit incorporates an integral automatic belt cleaning system within the freezing zone, and can be equipped with a highly cleanable, open-structure eye-link belt. This meticulous design guarantees a pristine processing environment.
Industrial food manufacturing requires equipment capable of swiftly adapting to changing product portfolios and seasonal demands. The Dohmeyer Cryo Tunnel provides unparalleled operational flexibility, seamlessly integrating into existing production lines. Driven by an advanced servo-driven gearbox, the system offers a vast range of customizable belt speeds. This allows operators to meticulously adjust the product's residence time within the freezing zone—from a rapid 90 seconds for delicate surface crust-freezing to up to 3 hours for deep-freezing large, dense items. Furthermore, the equipment features dual-fluid compatibility, meaning facilities can utilize either Liquid Nitrogen (LN₂) or Carbon Dioxide (LCO₂) depending on local availability and specific process thermodynamics. Available in multiple lengths and useful belt widths of up to 1495 mm, the tunnel easily scales alongside business growth. Guided by smart PLC controls, this highly adaptable tunnel ensures manufacturers remain competitive and ready for new market opportunities.
Let’s turn your process challenge into a technical solution.
Contact Us
Cookie Notice
We use essential cookies to make our website work and analytics cookies to understand how you use our site. We don't use cookies for advertising or sell your data.
Cookie Policy | Privacy Policy
