Instant coffee is an instant drink in powder form, pre-combined with sugar, milk and synthesized through drying and drying stages. When you want to enjoy, just make instant coffee with hot water and you can use it immediately. The processing helps to retain the flavor and flavor of the coffee, removing the insoluble and other impurities, so instant coffee can dissolve quickly in water.
There are two ways to produce instant coffee:
Spray Drying Method
Spray drying is a method of quickly drying coffee powder at high temperature to produces a fine powder of being easily soluble even in cold water. In spray-drying the coffee extract is sprayed into a stream of hot air at the top of a tall cylindrical tower. As the droplets fall, they dry, becoming a fine powder by the time they reach the bottom. Because of using high heat, the limitation of the method is that it is easy to remove the smell of coffee. Spray-drying is the most commonly used drying process because the process is relatively easy to manufacture and has a low cost.
Freeze Drying Method
The freeze-drying method allows you to enjoy coffee with its inherent flavor. In this method, the coffee solution will be rapidly cooled down to -40℃ to create ice crystals, and cut into granules. The frozen granules are then dried at low temperature and under vacuum. Drying at low temperature helps coffee retain its original flavor after the drying process, but this method is quite time consuming and also relatively expensive. Finally, the soluble coffee is packaged into either glass jars or sachets.