The heat transfer modes in the freeze dryer are mainly solid heat conduction heating, radiation and microwave heating, and convection heating....

Apple meat is fine and brittle, juicy, aromatic, sweet and sour, nutritious, with antipyretic and clearing fire, thirst, diuretic and antidiarrheal effect [, but due to high water content, nutrient-rich, susceptible to mechanical damage and Microbial infestation and corruption, thus losing the value of goods and processing quality. Processing apples by freeze-drying technology can reduce nutrient loss and reduce tissue damage to a minimum, and maintain the original color, fragrance, taste and shape of apples to a great extent. And easy to transport and store....

There are many advantages of freeze dryers, so we are not surprised that freeze dryers are widely used today. Yes, in fact, the application of freeze dryer covers many fields such as bioengineering, pharmaceutical industry, food industry, materials science and deep processing of agricultural and sideline products. Today we briefly introduce the application of freeze dryer in medicine and bioengineering....

How to choose the degree of vacuum in the drying process of the freeze dryer? It is a scientific method to determine the appropriate pressure for freeze drying by the vapor pressure of ice. ...

The quality requirements of the freeze-drying machine for freeze-dried products are: constant biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate and low residual moisture. ...