Spray drying equipment - Instant Tea Powder Process

15/12/2023 Alxa 0 Comments

Spray drying
technology can transform tea leaves into tea powder, instant tea powder is a gradually emerging category of tea drinks, this tea drink can not only conveniently and quickly replace the traditional way of tea brewing, but also has an excellent taste, which is welcomed by many consumers. The production process and technology of instant tea powder have a crucial impact on the quality and taste of tea powder. The instant tea powder production process mainly includes raw material treatment, extraction, purification, concentration, drying, packaging, and storage. The basic principle is that the water-soluble matter extracted from tea leaves is transformed transmuted, and then dried.
The specific steps are as follows:

1ã€Extraction: The processed and treated tea leaves are extracted to fully dissolve the tea components.

2ã€Concentration: the tea liquid is concentrated, the water in the tea juice is evaporated, and the flavor and aroma of the tea liquid are concentrated.

3, drying: the concentrated tea solution for spray drying treatment, so that the tea solution becomes powder.

4, crushing: the dried tea powder for mechanical grinding and grading process, to get the corresponding particle size of the tea powder.

5ã€Mixing: the tea powder of different kinds and different granularity will be scientifically proportioned and mixed.

6ã€Packagingï¼š Packaging the mixed tea powder to make instant tea powder.
There are two main types of drying techniques for instant tea powder: the high-temperature spray-drying method and the freeze-drying method.

Spray drying
tea powder is the atomizer will be concentrated tea atomized into very fine droplets, and hot air for intense heat exchange, drying into powder or granular, low water content tea extract, through the cyclone separator discharged wet air, so that the extract is precipitated in the collection of powder canisters. This drying method is characterized by fast drying speed, tea concentrate is atomized into small particles, increasing the surface area of liquid evaporation. Although the air temperature in the nozzle is high, the hot air inlet temperature of 150 ~ 250 â„ƒ, the droplets have a large amount of water evaporation, drying temperature is generally not more than the hot air wet bulb temperature, the product dispersion of solubility is good, the product is dried into a balloon of different particle sizes, the product is loose, the sealed containers drying non-polluting, the production process is simple, easy to operate, suitable for continuous production.
The process of freeze-drying tea powder consists of four stages: pretreatment, pre-freezing, sublimation, and re-drying. The basic process is to put the tea concentrate concentrated to 20%~30% into the tray, and the liquid thickness is controlled within 10~15mm, and then put the tray into the quick-freezing warehouse, freeze it to below the eutectic point (-18â„ƒ) of the tea concentrate (generally freeze it to -25~-30â„ƒ), and put the quick-freezing tea concentrate into the vacuum freeze-drying room, so that the solid of tea concentrate is in the state of sublimation, and then sublimation and then drying at a temperature lower than the material’s After sublimation, it will be dried at a temperature lower than the maximum temperature allowed for the material.
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