VACUUM FREEZE-DRYERS IN CAPE TOWN, SOUTH AFRICA
MARCOLD REFRIGERATION COMPANY
Dryers, Refrigeration Company, Freeze Dryers
Vacuum Freeze-dryers available in Cape Town:
professionally Designed, Build, Supplied, Installed and Serviced
by Marcold Refrigeration Company
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Marcold has an exceptionally good understanding of the vacuum freeze-drying process.
Their vacuum freeze dryers are automated (or can be mechanically operated).
They build their vacuum freeze dryers 100% custom-build around the client’s specifications and product protocol parameters.
About Vacuum Freeze-drying:
Vacuum freeze-drying (or lyophilization) is a dehydration process used to preserve perishable materials and/or make materials more convenient to transport.
The basic idea is to completely remove water from materials while leaving the basic structure (composition of the material) intact. Virtually any type of food or ingredient (solid or liquid) can be freeze-dried.
Vacuum freeze drying works by:
Freezing the material (to maintain its shape & biological structure).
Reducing the surrounding pressure (placed under a vacuum) to allow ice to change directly from a solid to vapour without passing through the liquid phase . The application of high vacuum in freeze drying causes ice to sublimate faster, making it useful as a deliberate drying process.
A cold condenser chamber and/or condenser plates provide a surface(s) for the vapor to
re-solidify on. These surfaces must be colder than the temperature of the surface of the material being dried for the vapor to migrate to the collector. Temperatures for this ice collection are typically below -50°C.
The vacuum freeze-drying process is technically called sublimation as moisture (ice crystals) is removed as a gas, similar to evaporation.
As a result, the greatly reduced water content inhibits the actions of micro-organisms and
enzymes that would normally spoil or degrade the substance.
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