Freeze drying machinery
The freeze drying machinery is referred to as vacuum freeze dryer, which is an essential equipment to realize the freeze drying process. The requirements of the freeze drying process for the freeze drying machinery mainly include: practicability, safety, reliability and advancement. Energy-saving, environmental protection, cost reduction, easy maintenance, and ease of use need to be considered when designing and manufacturing freeze drying machinery. Food, biological and pharmaceutical freeze drying machinery produce high-value products, so monitoring the freeze drying process is very important.
There are several main performance indicators of freeze drying machinery. 1. Ultimate vacuum level of freeze drying machinery when non-loading products: 2 ~ 3Pa for medical freeze drying machinery, 10~ 15Pa for food freeze drying machinery. 2. Evacuation time of freeze drying machinery with no-loading : from atmospheric pressure to 10Pa , it should be less than or equal to 0.5h for medical freeze drying machinery , and less than or equal to 0.75h for food freeze drying machinery. 3. The vacuum leakage rate of freeze drying chamber : start from 3Pa for medical freeze drying machinery and 10Pa for food freeze drying machinery , and observe for 0.5 hour , and the static air leakage rate is not more than 0.025Pa•m / s. 4. The time for the shelf temperature to drop from 20 ℃ to -40 ℃ should not exceed 2 hours. 5. The cooling rate of the ice condenser which is from 20 ℃ to -50 ℃ should not exceed 1h. 6. The temperature difference between the plates of freeze drying machinery should be controlled at around 1.5 ℃, the temperature difference in the plate is around 1 ℃, and the food freeze drying machinery can be appropriately relaxed. 7. The performance of vapor condenser should not be less than 10kg/m². 8. The noise of freeze dryer should be no more than 90dB.
The products processed by freeze drying machinery are sponge-like, have no shrinkage, have excellent rehydration, and have very little water content. After corresponding packaging, they can be stored and transported at room temperature for a long time. Because freeze drying machinery has the incomparable advantages of other drying methods, the technology has been more and more favored by people since its inception, and has been widely used in medicine, biological products and food.