Linear Cryogenic Quick Freezing Tunnel
This is a cryogenic type of tunnel especially engineered to freeze products by spraying Liquid Nitrogen or Liquid Carbon Dioxide onto the products and to reach extremely low temperatures at the core in a very limited time.
The tunnel is of a 100% stainless steel AISI 304 construction with satin finish. All welded components, except the conveyor belt, are cleaned through sanding. Welding is continuous, so contamination cannot penetrate the interstices.
Thermal insulation between the inside and outside is obtained through injections of self-extinguishing polyurethane foam between the steel walls. Overall wall thickness after insulation is 100 mm.



The temperature inside the insulated corridor can reach –100°C and is kept constant throughout the tunnel by means of electric fans. These fans optimise the distribution of the cryogen gas that is sprayed onto the products. The tunnel’s cooling corridor consists of two main bodies that will split when needed. When the bodies split, the inside of the tunnel and the conveyor belt are cleared, so they can be cleaned easily and thoroughly. The side and front casings at the corridor entrance and exit have a separate clearance pocket filled with polyurethane foam.
The tunnel is provided with a safety certificate of compliance with European directive EC 89/392 and subsequent amendments and European standards applicable to this type of machine.
To assure smooth running and compliance with health and safety regulations, the tunnel should generally be cleaned every 8 working hours, depending on product.
Cleaning should be carried out with the tunnel open and at such temperatures so as not to cause operating problems when work is resumed.