Cryogenic spiral freezers
• Mechanical spiral freezers
• Cryogenic spiral freezers convertible
into mechanical spiral freezers
• Continuous in-line I.Q.F. freezing tunnel
• “Cryofood” cryogenic freezing
tunnel with trays
• “Cryofood” mechanical
freezing tunnel with trays
• Quick-freeze linear tunnels
• Mechanical freezing chambers
• Cryogenic freezing chambers
• New Production Lines
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
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.