Product Description
The herb‑raw‑material vacuum microwave drying machine adopts 2450MHz microwave volumetric heating combined with high‑vacuum low‑pressure dehydration technology. Microwave energy directly acts on polar water molecules inside fresh or wet herb raw materials, including herbal slices, medicinal flowers, leaves, stems, roots, herb granules and thick herbal extracts. Water molecules vibrate, rub and collide at an ultra‑high frequency of 2.45 billion times per second and generate heat inside herbal tissues. Under high‑vacuum negative‑pressure environment, the boiling point of water drops significantly, realizing rapid low‑temperature vaporization and discharge of internal moisture from herb raw materials.
Different from traditional hot‑air circulating drying and ordinary vacuum ovens relying on surface heat conduction, this equipment effectively solves common‑industry bottlenecks for herb processing: thermal degradation of volatile oil, flavonoids and alkaloids, material surface crusting, outer‑dry‑inner‑wet, long drying cycles, oxidative browning and unstable batch‑to‑batch medicinal‑quality indicators.
During operation, wet herb raw materials are evenly laid on special microwave‑resistant trays inside the fully‑sealed vacuum chamber. The vacuum pump maintains stable negative‑pressure inside the cavity. Microwave penetrates herb tissues and delivers inside‑out volumetric heating. Evaporated water vapor is condensed by condenser and discharged out of system, completing integrated low‑temperature dehydration, drying and mild sterilization in batch‑type working mode.
Low‑oxygen vacuum environment inhibits herbal oxidative deterioration. It maximally retains natural color, floral aroma, volatile essential oil and medicinal active ingredients of herb raw materials, improving finished‑herb quality and storage stability for pharmaceutical factories and herbal‑tea production enterprises.
Main Advantages
Volumetric Inside‑out Heating, Uniform Low‑temperature Dehydration for Multi‑form Herb Materials
Adopts molecular volumetric heating instead of surface heat transfer; heat generates inside herbal tissues without heat‑conduction delay. Drying can be completed under mild temperature of 38‑60 ℃. It greatly shortens drying cycle compared with conventional herbal drying equipment and avoids surface hardening and uneven moisture. Each batch of herb raw materials achieves consistent moisture index, greatly raising finished‑product qualification rate for high‑value herbal‑material processing.
Low‑oxygen Gentle Treatment, High Retention Rate of Medicinal Active Substances
High‑vacuum low‑oxygen atmosphere restricts oxidation reaction. Short‑time low‑temperature processing protects volatile oil, alkaloids, flavonoids and heat‑sensitive medicinal components. Especially suitable for precious medicinal herbs, flower‑bud herbs, leaf‑shaped herbs and herbal thick extracts with strict requirements for color, fragrance and active‑ingredient retention.
PLC Intelligent Multi‑parameter Control, Adaptable for Various Herb Forms
Equipped with PLC touch‑screen control system; microwave power (supports pulsed power output), vacuum degree, drying temperature and holding time realize stepless adjustment. Multiple groups of herbal‑drying process recipes can be stored for one‑key switching, adapting to slices, blocks, granules, flowers, leaves and thick extracts with different initial moisture. Real‑time monitoring for cavity vacuum, material temperature and magnetron working state. Modular structure supports quick disassembly and cleaning, complying with pharmaceutical GMP hygiene specifications.
Sealed Batch Production, Mild Synchronous Sterilization & Complete Safety Protection
Fully‑sealed vacuum chamber avoids foreign‑impurity contamination. Multi‑stage microwave suppression devices ensure microwave leakage complies with international safety standards. Microwave brings mild sterilization effect to restrain mould and harmful microorganisms on herb raw materials. Equipped with over‑temperature alarm, pressure‑relief safety valve and magnetron water‑cooling protection, supporting stable long‑time batch‑to‑batch production, satisfying food‑medicine homologous and export‑grade herbal‑raw‑material standards.
Equipment Composition
The herb‑raw‑material vacuum microwave drying machine adopts SUS304 / SUS316L stainless‑steel sealed vacuum‑chamber modular design, complying with GMP hygiene requirements for pharmaceutical and herbal‑processing workshops. The complete set includes vacuum drying chamber, microwave generating unit, vacuum pump system, condenser moisture‑recovery assembly, special microwave‑resistant herb‑material trays, multi‑point infrared fiber‑optic 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 wet herb raw materials.
Application Fields
Custom‑developed for Chinese‑herbal‑medicine processing factories, herbal‑tea manufacturers, plant‑extract enterprises, health‑food producers and export‑oriented herbal‑raw‑material suppliers. Widely used for vacuum‑microwave low‑temperature dehydration for multiple kinds of herb raw materials. Processed herbs feature low residual moisture, complete appearance and high retention of medicinal active components.
