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LPS Series Vacuum Freeze Dryer for Fruit and Vegetable In order to help you solve some of the problems, which arise during - details see: https://www.machineto.com/lps-series-vacuum-freeze-dryer-for-fruit-and-vegetable-10297323

LPS Series Vacuum Freeze Dryer for Fruit and Vegetable In order to help you solve some of the problems, which arise during freeze-drying tests, we have the following short general description of the freeze-drying process.

Pre-treatment

Pre-treatment is to be understood as:

a) Preparation of the product before freezing.

b) Freezing-and for some products also granulation before drying.

Different products are processed (pre-treated) differently, but generally a distinction is made between pre-treatment of liquid products and solid products.

When evaluating the mist suitable pre-treatment of a product, the following should be taken into consideration.

Freezing point, dry matter content, vapor escape, freezing speed and in this connection the size of ice crystals, sublimation conditions, the heat conductivity of the frozen product, drying speed, and the required qualities of the dried product such as color, bulk density, taste reconstitution, and nutritive value.

As many variations in freeze-drying have to be considered, it is often difficult to obtain the required product characteristics while maintaining the most economical operating conditions.

Generally it can be said that a product may be successfully freeze-dried under various conditions. Thus it is not usually possible to an exact set of drying conditions for a particular product.