Freezing food preserves it from the time it is prepared to the time it is eaten. Since early times, farmers, fishermen, and trappers have preserved grains and produce in unheated buildings during the winter season.Freezing food slows down decomposition by turning residual moisture into ice, inhibiting the growth of most bacterial species. In the food commodity industry, there are two processes: mechanical and cryogenic (or flash freezing). The freezing kinetics is important to preserve the food quality and texture. Quicker freezing generates smaller ice crystals and maintains cellular structure. Cryogenic freezing is the quickest freezing technology available due to the ultra low liquid nitrogen temperature −196 °C (−320 °F).
Immersion Freezer Flayer
Liquid nitrogen offers with its -195,8°C (-321°F) far more cooling power compared to traditional cooling media, like water or thermal oils. This freezer is especially well suited to instantly freeze large volumes of delicate biological active fluids. Due to the contact with liquid nitrogen, freezing is instantaneous and happens on the spot, therefor capturing the properties and preserving the structure and activity of the biological active components as they are cooled down.
Immersion baths offer the ultimate freezing power for a variety of applications. Liquid nitrogen baths offer extremely low temperatures only reachable with cryogenic gasses, which allow specialised alloy treatments and special processes, where instant ultra-low cooling is required. As the products are plunged into the liquid, heat transfer takes place, thus altering or fixating the crystal grain structures of the treated metals into the desired constellations. Next to this effect, plunging put the products under stress, as they come into direct contact with the extreme cold of the cryogenic liquid nitrogen.
Supply Chain Cooling
“Freshness” is the crucial and critical requirement in many supply chains. To guarantee the freshness of perishable goods, they require a well-guarded, conditioned environment, including low preservation temperatures, to preserve the highest quality from the start to the end of the supply-chain. Dohmeyer Supply Chain Solution offers this qualitative chilled transport, guaranteeing high quality products at the end of your supply chain.
Bottom Top Tunnel
This tunnel is equipped with either liquid nitrogen or liquid carbon dioxide (CO2) injection, depending upon the product and process requirements. The freezing action happens right inside the tunnel where the cryogenic gases are injected into an insulated cold zone as the food product passes through it.
Cryogenic freezing offers a unique but often unknown solution with ultra low temperatures for a wide range of freezing and cooling processes. At Dohmeyer we are continuously working on better performing machine and thinking about ever more ingenious ways to find applications for cryogenic freezing gasses. Liquid nitrogen and liquid CO2 have specific properties that offer different advantages depending on the application.