Working Princple of Freeze Drying Machine

Under vacuum condition, material is freeze dried via principle of sublimation. The moisture in the pre-frozen material is directly sublimed from solid state (ice) to gaseous state (vapor), without melting. Freeze dried products are formed as sponginess, no shrinkage, rehydration excellent, very little water containing. The freeze dried product in sealed packaging can be stored and transported at room temperature for a long time.

How to process the freeze dried food?

Procedure of freeze dried pomegranate

Freezing: The pomegranate is frozen. This provides a necessary condition for low temperature drying.

Vacuum: After freezing, the pomegranate is placed under vacuum. This enables the frozen solvent in the pomegranate to vaporize without passing through the liquid phase, a process known as sublimation.

Heat: Heat is applied to the frozen pomegranate to accelerate sublimation.

Condensation: Low pomegranate -temperature condenser plates remove the vaporized solvent from the vacuum chamber by converting it back to a solid. This completes the seperation process.

Advantages of Freeze Drying Equipment

1. Efficient in heating plates. The material of heating plates is aviation aluminum after being anodized on the surface, releasing over 100% heat from the product by radiation. This makes heat more uniform and complete.

2. Alternate vapor trap. Double trap is installed under the heating plates in drying chamber. Trap 1 condenses vapor to its maximum cpacity, then trap 2 starts to work. In the meantime, trap 1 begins to melt ice for another condensation cycle.

3. Continous de-icing. When the trap 2 begins to catch vapor, the trap 1 begins to melt ice on the coil  during drying. After melting, the clean coil is ready for another condensation cycle.

4. Automatic control system. Advanced intelligent control system keeps the system running stably and reliably in a long time. Furthermore, simple operation can be much easier to handle.

Advantages of Freeze Dried Products

1. Nutrition basically remains. As drying is operated in low temperature and vacuum condition, the nutrition is kept completely.

2. Form basically remains. The water of food is drained directly from solid to gas, so the structure doesn’t change.

3. Colour basically remains. As drying is operated in low temperature and vacuum condition, the physical and chemical property of food changed little. There is also possibility of oxidation and enzyme, thus easy to keep original color.

4. Fragrance basically remains. Because the fragrant components in food largely exist in amorphous concentrated section during freezing, the fragrance can be kept when ice crystals are gasified.

5. The quality of product hardly losses. Because of the low rate of sublimating, the substance is basically in quiescent state. Thus the loss of product can be ignored.

Here to see small yield equipments!

Working principle of freeze dryer with double alternate cold traps

The green color trays with product locate between heating plates in red color, The cold trap I and cold trap II locate under the heating plates inside the drying chamber. Look at the picture as bellow, Cold trap II is working for condensation of vapor that comes from the product to keep good vacuum pressure for freeze drying processing, and Cold trap I is working for defrost, Low temperature steam (15~25℃)comes from De-icing tank into cold trap I to defrost the ice on the tube, and defrost water goes back to de-icing tank and drain out. Condensation and defrost function changes alternately by PLC automation control.

So, This kind construction has limitless on product input capacity, It has much more advantage than other kind of freeze dryers.

Training plan: We will provide training for those who operate and maintain the freeze-drying machines. Trained by supplier of the equipment in the process of installation and debugging, people can operate  and solve the basic mechnical problems independently. In addition, the persons who work in general engineering such as refrigeration, boiler, and transformer substation shall be undertaken by skilled workers.

1. We guarantee that the commodity hereof is made of the best materials and new brand with top workmanship, and in accordance with quality specification stipulated in product Contract and Appendix.

2. Guarantee period shall be within 12 months from the date of acceptance. During this period, if there are quality problems, we will provide solution by verbal or written communication. If the problem is unsolved, our engineers will repair for you on site as soon as possible. The maintenance is free when there are non-operation errors; otherwise it is for the buyer’s account.

Shenyang Aerospace Xinyang Quick freezing Equip. Manuf. Co., Ltd was founded in 1985, a leading enterprise incorporating the research, manufacturing, sales and services of food processing equipment and freezing technology. Freeze drying equipment and IQF freezing equipment are widely used around the world.

Xinyang Company closely cooperated with Atlas Company in Denmark, Harbin Commerce University, Zhejiang University and Northeastern University, etc., supporting over 1,000 food engineering projects both domestically and abroad.

It is one of the earliest, largest and most influential professional manufacturers in China. Our products have been exported to USA, Canada, Germany, Netherland, Singapore, Thailand, Malaysia, Indonesia, Korea, Myanmar, Chile, Nigeria etc. The company pays highly attention to food quick freezing, vacuum freeze drying, vacuum frying solution and pre-processing system.

Now Xinyang Company aims to give all of our customers best products and services.