Spray drying and freeze drying are the main drying techniques for instant tea

There are two methods for drying instant tea, one is spray drying, and the other is freeze drying. Before the spray drying, carbon dioxide is introduced into the tea soup to make the tea juice full of tiny bubbles. When the spray is dried, the carbon dioxide gasification runs out, and the tea powder forms small particles in the middle of the air, which can increase the instant solubility. If it is a tea with sugar and juice, it can also be boiled or freeze-dried. The product is like wheat milk. Freeze-drying is to reduce the temperature of the tea juice to a few tens of degrees below zero, then gradually increase the temperature, while decompressing, to remove the sublimated water, freeze-dried instant tea, loose texture, especially good solubility, hot and cold solution.

Spray drying is a method in which systemic techniques are applied to the drying of materials. After the thinner is atomized in the drying chamber, the moisture is rapidly vaporized in contact with the hot air to obtain a dried product. The method can directly dry the solution and the emulsion into a powdery or granular product, thereby eliminating the steps of evaporation and pulverization.

Freeze drying is also known as sublimation drying. A drying method in which the aqueous material is frozen below freezing point, the water is converted to ice, and then the ice is converted to steam under higher vacuum. The material can be frozen in a freezer and then dried. However, it can also be directly frozen in a drying chamber by vacuuming it. The water vapor generated by sublimation is removed by a condenser. The heat of vaporization required for sublimation is generally supplied by thermal radiation.

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