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7.2.2.
IN CHAMBER
The product may be freeze-dried inside the condenser or in the chamber:
•
Inside the condenser (see Fig. 5): It is advisable to load the product only on the lower and middle plates.
The higher plates do not receive cold as do the other plates because the vacuum supply is placed at top of the
condenser. The equipment allows you to program recipes (see chapter 10) to run a complete cycle without
making any manual actions.
•
Outside the condenser: This is recommended when the quantity of product allows you to load the three
plates. It is advisable to freeze the product inside the condenser, because the heated plates will be cold and
heating rates from negative temperatures may be reached. Once the product is frozen, remove the plates of
the condenser and place them in the chamber (see Fig. 6). Also it is possible to load a product that has been
frozen in other equipment. The equipment allows you to program recipes (see chapter 10) to run a complete
cycle without making any manual actions once the product is frozen and the chamber has been placed.
NOTE
•
The product layer should be as thin as possible (recommended height <20mm). The time of the freeze-drying
process depends for an important part from this height. It is very advisable to load the freeze-dryer uniformly
and that the height of product is the same in all zones.
•
The time of the process also depends on:
-The heat provided to product (external if the manifold is used or by means of an electrical resistor placed
inside the plates).
-The maximum temperature accepted by the product.
-The final degree of humidity desired.
-The percentage of solid material in the product.
-The vacuum degree obtained.
-The total amount of product to be dried each time.
-The temperature of the condenser.
IM-LYOQUEST-EN-SP-1016a.doc
Fig. 5
Fig. 6
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