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Working Princple of Freeze Dryer
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?
| Specification Model | LG30 | LG50 | LG75 | LG100 | LG125 | LG200 | |
| Heating Areas(m2) | 30 | 50 | 75 | 100 | 125 | 200 | |
| Numbers of Vapor trap | Single | Double | Double | Double | Double | Double | Double |
| Trapping Capacity | >400kg/batch | >66kg/hr | >110kg/hr | >165kg/hr | >220kg/hr | >275kg/hr | >440kg/hr |
| Heating Medium | Water&electric | Water&Steam | Water&Steam | Water&Steam | Water&Steam | Water&Steam | Water&Steam |
| Heating Mode | Double side radiation | ||||||
| Temperature range of Heating plates | <95℃ | Normal Temp.~+130℃ | |||||
| Vacuum Pressure (Pa) | 20~133 | ||||||
| Need Refrigeration Capacity (t0=-40℃,tk=-35℃) (Kw) | 55 | 80 | 120 | 160 | 200 | 320 | |
| Consumption of Steam (kg/h) | None | 150 | 200 | 280 | 340 | 400 | 690 |
| Electric Power Supply (Kw) | 75 | 40 | 43 | 63 | 69 | 85 | 115 |
| Tray Numbers | 78 | 80 | 120 | 180 | 240 | 300 | 480 |
| Loading Raw Material | >390 | >400 | >600 | >900 | >1200 | >1500 | >2400 |
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.
Features
1. Much lower frying temperatures (approx. 90 to 120℃ in practical operation, depending on the product) to maintain flavours and colors.
2. Processing products with higher reducing sugar levels in comparison with normal atmospheric conditions.
3. Minimizing of health harmful thermal reaction products, such as acrylamide.
4. Texture can truly be influenced.
5. Evaporation rate will be faster.
6. Pressure as a new parameter of control next to retention time and temperature.
7. More gentle oil handling.
8. Lower steam pressure for frying oil heating systems required than in atmospheric fryers (approx. 8 bar).
9. No frying vapor emission.
Advantages
(Freeze dryer)
1. Efficiency of heating plates. The material of heating plates is aviation aluminum with anodized on the surface, over 100% heat release to the product by radiation, keeping heating uniformity completely.
2. Alternate vapor trap. Double vapor trap are installed under the heating plates in drying chamber. Trap 1 condenses water vapor to its maximum working cpacity, then trap 2 starts to condense. In the meantime,trap 1 begins to melt ice for another condensation cycle.
3. Continous de-icing. When the trap 2 begins to catch water vapor, the trap 1 begins to melt ice on the coil during the product being dried. After melting, the clean coil 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.
(Freeze dried products)
1. Nutrition basically remains unchanged. Drying is operated in low temperature and vacuum conditions, so the nutrition is kept, particularly effective to heat sensitive materials.
2. Form basically remains unchanged. The water contained in food is drained directly from solid to gas, so the structure doesn’t change, and just forms space between ice crystals. .
3. Colour basically remains unchanged. As drying is operated in low temperature and vacuum conditions, the physical and chemical properties of food changed little. There is also little possibility of oxidation and enzyme, thus easily to keep original color.
4. Fragrance basically remains unchanged. Because the fragrant components in food largely exist in amorphous concentrated section in the process of freezing, the fragrance can be kept when ice crystals are gasified.
5. The quality of solids hardly losses. Because of the low rate of sublimating water vapor, the substances are basically in quiescent state, thus the loss of solids quality can be ignored.
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.
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