Freeze dryer

Freeze Dryer

A freeze dryer (referred to as a lyophilizer) is a device that utilizes vacuum freeze-drying technology (Freeze-Drying, also known as lyophilization) to dehydrate and dry materials by directly sublimating the moisture in them from a solid state (ice) to a gaseous state under low-temperature and low-pressure environments. Its core advantage is that it can maximize the retention of the active ingredients, nutritional structure, shape, and flavor of the materials, and it is widely used in fields such as medicine, food, bioengineering, and new materials.

Structural Composition

The structure of a freeze dryer must simultaneously meet three core requirements: “low-temperature freezing”, “vacuum environment”, and “heat supply”. It mainly consists of the following systems:
Refrigeration system Compressor, condenser, expansion valve, evaporator (inside the freeze-drying box / inside the water trap), refrigerant (such as R404A, R23)

Working Principle

The core of freeze-drying lies in the “triple-phase change of water” — using a vacuum environment to make ice sublimate directly without going through the liquid phase. The entire process is divided into three indispensable stages: pre-freezing, sublimation drying, and desorption drying.
1.Freezing Stage;
2.Primary Drying Stage;
3.Secondary Drying Stage;

Features

The advantages of freeze dryers stem from their “low-temperature vacuum” drying environment, with the following specific characteristics:
1. Preserve the core quality of materials;
2. The product has high stability;
3. Strong compliance;

Application fields

The application scenarios of freeze-drying machines are highly dependent on the needs of “preserving quality” and “extending shelf life”, and are mainly concentrated in the following industries:
1.Pharmaceutical industry;
2.food industry;
3.bioengineering;
4.New Materials Industry;