The freeze drying process include What are the drying steps

You want to learn about freeze drying techniques, product drying techniques using freeze dryers, drying processes or freeze drying technology processes, or a similar name, then in this content the Mactech will analyze the steps of drying products with whole lotus-marinated tea for Readers to better understand. This will help you know the appropriate drying method for different products.

When talking about the technological process of freeze drying for any product, we will understand that these are the general steps of a drying process on a freeze dryer, but for specific dried products, There will be different parameters such as drying temperature, pressure, time…
When the dryers are not modern enough, we will have a complicated drying process, but with today’s very modern drying equipment, the drying process is quite simple, so talking about the technology transfer can mean This may be a exaggeration of information about current product drying techniques. Below is the process of sublimation drying technology specifically analyzed to help customers understand what to do when using the dryer.

The freeze drying technology process includes the following steps:

1. Product preparation: products that need to be dried include fruits, vegetables, fish, meat, powder solutions, medicinal herbs, mushrooms…. Before drying, it is necessary to have standards or notes on product size, thickness, and thinness to ensure the drying process is fast, dry evenly, and the size meets the requirements.
   After properly preparing the product, place it on the tray so that the product is in contact with the surface of the tray as much as possible. The heat transfer principle or heat transfer method on the freeze dryer is heat transfer through surface contact, so the more contact, the faster the heat transfer.
2. Prepare the machine: this step requires checking some issues such as the drying chamber must be clean, the shelf surface must be clean, the condenser must drain all water from the previous drying batch, lock the valves, check the vacuum pump using the check function on the controller…
3. Put the product into the machine, plug in the sensor: after place the drying tray containing the product into the drying chamber, the next thing to note is to plug the sensor wires into the product core, see instructions in the video below.
4. Drying parameter settings: for the current new generation of freeze drying machines, the parameters that need to be set will be much simpler than before. Previously, we had to set up many drying stages, but now with the pressure-based temperature controller, we only need to set two main parameters: sublimation pressure and maximum temperature for the product, the control software will automatically calculate the remaining parameters for the most optimal drying process. The installation steps are included in the manual included with the machine.
5. Operate the machine and monitor: after setting the appropriate parameters, or drying the next batch, you just need to select the restart function and the machine will start operating. The stages that will go through include 1- freezing the product to -30^oC, 2- transferring the cold to the condenser chamber to -40^oC, 3- vacuuming to the sublimation pressure threshold, 4- the process of increasing the temperature of the product, This is the stage where ice will sublimate continuously until the product is completely dry.
6. Time to end the drying process: the freeze drying method will not end the drying process according to the preset time, but will end according to the temperature parameters displayed on the control screen. With the Mactech sublimation dryer, on the controller there are 4 heat parameters: D – V – T -X. When all 4 parameters are > 30^oC, the product will ensure to be completely dry. Particularly for drying probiotics, it only needs > 20^oc.
7. Check finished products and packaging: one thing to note with freeze-dried products is that the dryness is very high, only 0~3%, so it is highly brittle, easily broken, especially it can absorb moisture from the air very easily, so after drying, it needs to be stored immediately in a sealed zip bag, vacuum sealed, in a sealed box…
8. Turn on defrost mode: after removing all the products from the machine, users need to turn on defrost mode to melt the ice in the condenser chamber as quickly as possible before drying the next batch, If you’re not in a hurry, just let the ice melt naturally to save electricity.

On this Máy sấy thăng hoa website, we provide information in both English and Vietnamese so that users can easily find instructions for using each dryer and how to dry the product.

The drying steps listed above are the freeze drying technology process for a certain product, Drying parameters may differ slightly for products with different characteristics. Customers will be advised in accordance with actual usage. For more relevant information, please contact Mactech Việt Nam. Thank you for learning about the shared content.