Product Description
Vacuum Microwave Dryer is an innovative drying unit that combines microwave dielectric heating and vacuum technology. Its operation relies on two synergistic mechanisms:
- Microwave volumetric heating: 2450 MHz microwaves penetrate into materials. Polar molecules such as water molecules oscillate at extremely high frequency and generate heat through intermolecular friction, enabling simultaneous temperature rise throughout the material.
- Low‑temperature vacuum environment: The vacuum assembly lowers pressure inside the drying chamber, greatly reducing water’s boiling‑point. Moisture inside raw materials vaporizes rapidly under mild temperature conditions.
Working together, the two technologies deliver fast and even dehydration under low‑temperature and oxygen‑free conditions, perfectly protecting heat‑sensitive active ingredients.
Main Advantages
1. Low-temperature & Oxygen-isolated Drying, Maximum Material Activity Retention： The vacuum environment greatly lowers the boiling point of water, enabling effective dehydration at temperatures below 40℃. Working in an oxygen-free condition prevents oxidation and thermal degradation of heat-sensitive active ingredients such as proteins and enzymes. Finished materials retain original color, fragrance, nutrients and biological activity, while maintaining excellent rehydration performance.
2. Ultra-fast & High-efficiency Drying： Different from traditional conduction and convection heating, microwave energy acts directly inside materials without heat transfer medium. Water vapor generated internally is rapidly extracted under vacuum. This technology boosts production efficiency by 4–20 times and shortens processing time to only 1/5–1/10 of conventional vacuum drying methods.
3. Uniform Heating with Minimal Internal & External Temperature Difference： Microwaves feature selective heating toward water molecules. High-moisture areas inside materials absorb more microwave energy, aligning heat generation with moisture diffusion direction. Synchronous internal and external heating eliminates common defects such as surface crusting and uneven drying.
4. Extreme Energy Saving & Low Operational Cost： Microwave energy targets only processed materials, with no heat loss on equipment cavity or ambient air. It reduces energy consumption by 60%–75% compared with traditional drying technologies. Without supporting facilities such as boilers and pipelines, it greatly cuts equipment investment and daily operating expenses.
5. Intelligent & Flexible Automatic Operation: Equipped with PLC touch-screen control system, the machine supports stepless adjustment of microwave power and vacuum degree. Drying temperature can be freely set between 40℃ and 100℃. Built-in infrared temperature sensors realize real-time and accurate temperature monitoring. Optional IoT remote monitoring and cloud data uploading enable intelligent unattended production.
6. Integrated Sterilization for Extended Shelf Life: Microwave thermal effects effectively eliminate bacteria, mold and insect eggs inside materials. Meanwhile, the oxygen-isolated vacuum environment restrains oxidative deterioration. It delivers hygienic final products and significantly prolongs shelf life.
7. Safe & Eco-friendly Operation: Professional microwave suppressors installed at inlet and outlet control leakage within 5mW/cm², fully complying with national safety standards. The entire drying process produces no waste gas, wastewater or residues, achieving pollution-free and environmentally friendly production.
8. Multi-functional All-in-one Machine: A single unit integrates drying, sterilization, concentration and curing functions. It serves dual purposes as both a vacuum drying machine and a vacuum concentration system, diversifying production capacity and saving equipment investment.
Equipment Composition
Component | Function Description |
|---|---|
Microwave Generating System | Consists of magnetrons and high‑voltage transformers to produce 2450 MHz microwave energy. |
Vacuum Drying Chamber | Fabricated from 304 stainless‑steel. Pressure‑resistant and hermetically sealed, where materials complete the whole drying procedure. |
Vacuum System | Equipped with water‑ring vacuum pump, achieving vacuum degree down to ‑0.098 MPa (approx. 0.98 kPa). |
Material Loading System | Rotary trays or conveyor belts are adopted to guarantee even heat distribution across workpieces. |
Temperature Monitoring & Control System | Infrared temperature measurement provides accurate real‑time temperature tracking for materials. |
Automatic Control System | PLC touch‑screen control supports programmable setup and storage of multiple process recipes. |
Cooling System | Keeps magnetrons and other core components stable for long‑term continuous operation. |
Application Fields
Vacuum Microwave Dryer is widely used for low‑temperature dehydration of heat‑sensitive materials across food, pharmaceutical, chemical, bioengineering and advanced‑material industries.
Food Industry: Low‑temperature dehydration for fruit‑vegetable crisps including banana chips and apple crisps; agricultural products such as grains, lily bulbs, fresh flowers, dried fruits, forage and edible fungi; aquatic goods; nutritional products like honey, royal jelly and bee pollen.
Pharmaceutical Industry: Gentle drying for herbal extracts, precious medicinal herbs (ginseng, pilose antler, cordyceps, bezoar etc.), Chinese‑western medicine preparations, pills and granular pharmaceutical materials.
Biochemical Industry: Low‑temperature concentration and crystal‑water removal for enzyme preparations and biochemical & chemical raw materials.
Research & Development: Process testing and small‑batch production for high‑value lab‑grade samples.
