Product Description
The heat‑sensitive material vacuum microwave dryer combines 2450 MHz microwave volumetric heating technology with high‑vacuum low‑pressure dehydration principle. Microwave energy directly acts on polar water molecules inside heat‑sensitive raw materials including Chinese herbal extracts, medicinal slices, edible flowers, plant extracts, biological preparations, probiotics, heat‑sensitive food additives and thermolabile chemical intermediates. Water molecules vibrate, rub and collide at an ultra‑high frequency of 2.45 billion times per second, generating heat inside the material itself. Under high‑vacuum negative‑pressure environment, the boiling point of water drops sharply, realizing rapid low‑temperature vaporization and discharging of internal moisture of materials.
Different from conventional hot‑air drying and ordinary vacuum ovens relying on surface heat conduction, this equipment effectively solves typical processing difficulties of heat‑sensitive materials: thermal decomposition of active ingredients, surface crusting, long drying cycle, uneven moisture, oxidative browning and unstable batch quality caused by high‑temperature exposure.
During operation, wet heat‑sensitive materials are placed on special microwave‑resistant trays inside the sealed vacuum chamber. The vacuum pump maintains stable negative‑pressure state inside cavity. Microwave penetrates materials and generates inside‑out volumetric heating. Evaporated water vapor is condensed by condenser and discharged out of the system, completing integrated low‑temperature dehydration, drying and mild sterilization in batch operation mode.
Low‑oxygen vacuum environment restrains oxidative deterioration. It maximally retains natural pigment, volatile aroma, flavonoids, alkaloids and other thermolabile active components, improving finished‑product quality and storage stability for high‑value heat‑sensitive raw‑material production.
Main Advantages
Volumetric Internal Heating, Low‑temperature Uniform Dehydration for Heat‑sensitive Substances
Adopts molecular volumetric heating instead of surface heat transfer; heat originates inside materials without heat‑conduction delay. Drying can be completed under mild condition of 35‑60℃, greatly shortening drying cycle compared with traditional drying equipment. Effectively avoids surface crusting and outer‑dry‑inner‑wet phenomenon. Moisture content stays uniform for each batch, greatly raising finished‑product qualification rate for high‑value heat‑sensitive material processing.
Low‑oxygen Gentle Processing, Minimize Loss of Thermolabile Active Ingredients
High‑vacuum low‑oxygen working atmosphere inhibits oxidation reaction. Short‑time low‑temperature treatment protects volatile oil, vitamins, biological activity and natural color. Especially applicable for high‑value raw materials that cannot withstand high‑temperature processing, such as herbal thick extracts, rare medicinal herbs, probiotics, edible flowers and biological intermediate products.
PLC Precise Multi‑parameter Control, Pulsed Microwave Protection for Fragile Materials
Equipped with PLC touch‑screen control system; microwave power (support pulsed power output), vacuum degree, drying temperature and holding time can be adjusted steplessly. Multiple sets of drying process recipes are stored for one‑key switching, adapting to paste, slice, granule and block‑shaped heat‑sensitive materials with different initial moisture. Real‑time monitoring for cavity vacuum, material temperature and magnetron working state. Modular structure supports convenient cleaning and maintenance complying with pharmaceutical and food‑grade GMP requirements.
Sealed Batch Production, Synchronous Mild Sterilization & Complete Safety Protection
Fully‑sealed vacuum chamber avoids external impurity contamination. Multi‑stage microwave suppression ensures microwave leakage meets international safety standards. Microwave brings mild sterilization effect to inhibit mould and harmful microorganisms. Equipped with over‑temperature alarm, pressure‑relief safety valve and magnetron water‑cooling protection device, supporting stable long‑time batch production, satisfying food‑medicine homologous and export‑grade raw‑material standards.
Equipment Composition
The heat‑sensitive material vacuum microwave dryer adopts SUS304 / SUS316L stainless‑steel sealed vacuum chamber modular design, complying with GMP hygiene specifications for pharmacy and food processing. The complete set includes vacuum drying chamber, microwave generating unit, vacuum pump system, condenser moisture‑recovery assembly, special microwave‑resistant material trays, infrared multi‑point temperature monitoring module, pressure‑relief safety protection device, PLC intelligent control cabinet and circulating water‑cooling system. It is specially developed for large‑scale standardized low‑temperature dehydration and drying of various heat‑sensitive raw materials.
Application Fields
Custom‑built for Chinese herbal medicine factories, plant‑extract enterprises, biological‑product manufacturers, high‑end health‑food processing plants and export‑oriented high‑value raw‑material producers. Widely used for vacuum microwave low‑temperature dehydration for various heat‑sensitive materials. Processed materials feature low residual moisture, high retention rate of active components and stable color and luster.
