Advantages of spray drying — change substance’s size, shape, and density and improve quality
Spray drying machine is usually used to remove moisture from raw materials. In addition, it has many other uses, such as: changing the size, shape or density of the substance, it can help add other ingredients in the production process, and help produce the most stringent quality products.
Advantages of spray drying — reduce food weight and make it easy to carry or transport
The production of fruit and vegetable powder by spray drying can retain the nutrients of fresh fruits and vegetables, and the volume has been reduced by 70%, which is easy to eat and transport.
Advantages of spray drying — remove toxicity of some foods
Some plants require a certain temperature to remove toxicity. For these plants, the spray drying technology is ideal. Taking soybeans as an example, the concentration process requires a certain temperature to remove a substance called trypsin inhibitors(this substance will hinder digestion and decomposition of protein).
Spray drying vs freeze drying — freeze drying
Freezing water-containing materials below freezing point, turning water into ice, and then turning ice into steam under high vacuum. The material can be frozen in the freezing device before being dried. However, it can also be frozen directly in the drying room by quickly drawing into a vacuum. The water vapor generated by sublimation is removed by a condenser. The heat of vaporization required in the sublimation process is generally supplied by thermal radiation.
Advantages of freeze drying — keep substances’ biological vitality
Freeze-drying is carried out at low temperatures, so it is particularly suitable for many heat-sensitive substances, such as proteins and microorganisms. These substances will not be denatured or lose biological vitality.
Advantages of freeze drying —small loss of volatile components
When drying at low temperature, the loss of some volatile components in the substance is very small, suitable for drying some chemical products, medicines and foods.
Advantages of freeze drying — keep the original characters
During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot be performed, so the original characters can be maintained.
Advantages of freeze drying — maintain the volume and structure
Because it is dried in a frozen state, the volume is almost unchanged, the original structure is maintained, and concentration does not occur.
Advantages of freeze drying — long shelf life
Freeze drying can remove more than 95-99% of the water, so that the dried product can be stored for a long time without deterioration.
Spray drying vs freeze drying — conclusion
Spray drying and freeze drying are used in different situations. There is no final conclusion on which one is better. As have mentioned, spray drying is suitable for plants that require high temperatures to remove toxicity, but there are plants of which the nutrients will be lost due to high temperature. For these plants, vacuum freeze drying machine is more suitable.