Freeze dried food is very popular in market, featured characters like lossless drying result, easy rehydration and light weight. Products after freeze drying process without rigorous storage condition request such as cooling, freezing, special packing way etc., Instead, they could storage in room temperature and lasting up to 20 years.
Food Freeze Drying Principle
Freeze drying also known as lyophilization or sublimation, is a low temperature drying process that skip liquid phase. Freeze drying works by freezing food to solid, and then reduce its surround pressure(drying house), which result the solid water (ice) will direct vapor to gas phase. By this way, water in raw material success move out.
Food Freeze Drying Cycle Time:
Normally, food freeze drying process need 14 to 24hrs. Also,it depends on raw material features and loading volume, for example: some item is easy to dry(like coffee only need 6-7hours), and some item may need a few days; If load too much material in trays, it may also take longer to dry; as well, if heaviest water in raw material exceed ice condenser MAX capacity, it may cannot complete dry.
Freeze Dried Food Advantages:
Compare with traditional drying method, freeze drying have great advantages whatever in appearance, nutrition contain, storage condition or flavor and taste aspects.
- Freeze drying foods or beverages in low temperature will not damage their physical structure and texture, dried products no shrink, nutrition contain very close to fresh, preserve without cooling need, could be easily reconstitute by add water.
- Freeze dried food MAX could storage 20 years and no need special environment (temperature/moisture) request !
Applications In Food Products:
- Prepared meals
- Cooked soup
- Original or extract solid, liquid, mixture all could be successful freeze drying.
Almost all common food products could success freeze drying after research its freeze drying recipe, larger size items may need cut or slice to small pieces so that help speed up drying, berry products like strawberry, blueberry etc., after proper treatment could entire drying.
But some products use freeze drying method: take too long time and nutrition is very similar with other drying method, its not very suit and not cost-effective.
Food Freeze Drying Steps:
- Pre-treatment: washing/peeling/cutting or cooking/dosage.
- Tray loading or division.
- Drying chamber loading.
- Prepare another batch.
Vikumer Freeze Dry designed and manufactured a range of food freeze drying machines, please feel free contact us of your applications and the possibilities.
Contact us get more information of the food freeze dryer or check our full range freeze dryers.