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The Wood Ear Mushroom Microwave Dryer is independently developed by Jinan Longdiya Machinery Technology Co., Ltd. Specifically designed for the deep-processing of edible fungi, it operates at the 2450 MHz industrial microwave frequency band, instantly converting electromagnetic energy into molecular kinetic energy to achieve highly efficient dehydration from approximately 80% moisture content down to a finished product of ≤12%. The machine integrates dehydration, sterilization, and shape-fixing into a single process, with full low-temperature control throughout, maximizing the retention of natural colloids, active polysaccharides, and the deep-black luster of wood ear mushrooms. It provides edible fungus processing enterprises with a complete, end-to-end solution from fresh product to dried product.
Traditional wood ear drying relies on hot-air convection or sun-drying, which suffers from long drying cycles, uneven heat distribution, browning discoloration, and severe nutrient loss. The Longdiya microwave dryer is built on the principle of dielectric-loss heating, where polar water molecules inside the mushroom tissue undergo high-speed orientation and friction under a high-frequency electromagnetic field. Heat is generated simultaneously from the inside out, completely overturning the traditional "outside-to-inside" heat-transfer model.
Core Mechanism: Microwave energy penetrates the fleshy cap and gill layers of the wood ear, reaching deep into the stem and fold-textured surfaces. Water molecules flip with the electric field at a frequency of 2.45 billion times per second, generating friction heat that rapidly vaporizes moisture. The entire temperature-rise process is uniform and controllable, eliminating risks of scorched exteriors with wet interiors or central mold growth.
Low-temperature microwave drying (40–75°C) precisely inhibits polyphenol oxidase activity to prevent enzymatic browning. The finished product retains a jet-black, glossy appearance with intact, fully stretched fruiting bodies and clearly defined folds. The rehydration rate exceeds 1:12, and elasticity remains almost unchanged after soaking.
Traditional high-temperature drying (100–150°C) destroys the molecular structure of polysaccharides and dietary fibers. Microwave drying completes dehydration at a gentler temperature, preserving core active ingredients such as β-glucan and auricularia polysaccharides at a retention rate exceeding 95%, enhancing the product’s value as both food and medicine.
Microwave energy acts directly on the wood ear substrate without preheating ambient air or heating large oven walls. The metal-enclosed resonant-cavity design reflects microwave energy back into the material, achieving an absorption rate above 90%. Compared with conventional hot-air dryers, electricity consumption is reduced by 40%–60%, significantly lowering per-batch processing costs.
The synergistic effect of microwave thermal and non-thermal biological effects kills E. coli, mold spores, and insect eggs during the dehydration process, achieving a sterilization rate of ≥99.9%. The dried wood ear can be packaged directly without secondary irradiation or sulfur-fumigation treatment, meeting export standards for the EU, Japan, and South Korea.
Equipped with an intelligent PLC control system and a 10.1-inch touchscreen, drying power, conveyor speed, and chamber temperature/humidity can be adjusted steplessly in real time. The system supports storage of up to 30 process recipes; different varieties (black wood ear, hairy wood ear, white wood ear) can be switched with one click, greatly lowering the operational threshold.
From laboratory-scale compact units to industrial-grade tunnel lines, Longdiya offers a full spectrum of equipment. Single units support 8–24 hours of continuous operation.
Feature Dimension | Detailed Description |
|---|---|
Heating Method | Magnetron emission at 2450 MHz ± 50 MHz; volumetric penetration heating |
Cavity Material | Food-grade 304 stainless steel with mirror-polished inner walls; no microwave dead zones; easy to clean |
Conveyor System | Optional PTFE mesh belt or stainless steel chain plate; variable-frequency speed control 1–5 m/min; adapts to different spreading thicknesses of wood ear |
Leakage Prevention | Triple-shielded door structure; microwave leakage ≤ 5 mW/cm², far below national limits |
Dehumidification System | Centrifugal fan + condensation recovery unit; rapidly removes water vapor; prevents chamber condensation and microwave reflection interference |
Temperature Control Accuracy | Infrared online temperature measurement + PID closed-loop control; chamber temperature fluctuation ≤ ±2°C |
Observation Window | Microwave-shielded viewing window for real-time monitoring of drying status without stopping the machine or opening the chamber |
Safety Protection | Five-fold safety system: over-temperature protection, door interlock, phase-loss protection, earth-leakage protection, emergency stop button |
Black Wood Ear (Auricularia auricula-judae): Autumn wood ear, spring wood ear, wild black wood ear — bulk dehydration and sterilization
Hairy Wood Ear (Auricularia polytricha): Yellow-back and white hairy wood ear — drying and shape-fixing
White/Jade Wood Ear (Tremella fuciformis): Maintains crystal-clear color; prevents yellowing
Silver Ear (Tremella): Low-temperature slow dehydration to retain colloidal content; avoids scorched edges
Shiitake / Oyster Mushroom / King Oyster Mushroom: Sliced microwave drying to lock in flavor compounds
Dehydrated Vegetables: Daylily, kelp, nori, wakame
Spices & Seasonings: Sichuan pepper, star anise, cinnamon, ginger slices (retaining volatile-oil content)
Nuts & Roasted Seeds: Pine nuts, walnuts, almonds — low-temperature roasting and sterilization
Chemical Raw Materials: Catalyst supports, molecular sieves, inorganic salt powders — rapid dehydration and drying
Pharmaceutical Intermediates: Antibiotic APIs, API precursors, fine chemical intermediates — low-temperature dehydration and aseptic drying
Seafood: Dried shrimp, whitebait, clove fish, scallops, sea cucumber — low-temperature dehydration preserving umami flavor and protein activity
Longdiya offers a complete product line from laboratory to industrial-scale production. Customers can select the appropriate model based on daily fresh wood ear processing volume, floor space, and budget.
Model | Service frequency | Output power | Microwave output power | Outline dimension | Dehydration | Sterilization yield |
LDY-20PW-4X | 2450±50HZ | ≤26KW | ≥20KW | 8500 × 750 × 1800 mm (customizable) | ≥20kg/h | Approximately 180–250 kg/h |
LDY-30PW-6X | 2450±50HZ | ≤36KW | ≥30KW | 10500 × 800 × 2000 mm (customizable) | ≥30kg/h | Approximately 280–350 kg/h |
LDY-40PW-6X | 2450±50HZ | ≤46KW | ≥40KW | 10500 × 900 × 2000 mm (customizable) | ≥40kg/h | Approximately 380–450 kg/h |
LDY-50PW-6X | 2450±50HZ | ≤58KW | ≥50KW | 12200 × 1000 × 2000 mm (customizable) | ≥50kg/h | Approximately 480–550 kg/h |
LDY-60PW-8X | 2450±50HZ | ≤68KW | ≥60KW | 13500 × 1000 × 2000 mm (customizable) | ≥60kg/h | Approximately 500–600 kg/h |
LDY-70PW-10X | 2450±50HZ | ≤78KW | ≥70KW | 13500 × 1200 × 2000 mm (customizable) | ≥70kg/h | Approximately 700–800 kg/h |
LDY-80PW-10X | 2450±50HZ | ≤90KW | ≥80KW | 15500 × 1200 × 2000 mm (customizable) | ≥80kg/h | Approximately 800–900 kg/h |
LDY-100PW-12X | 2450±50HZ | ≤110KW | ≥100KW | 16500 × 1400 × 2000 mm (customizable) | ≥100kg/h | Approximately 1000–1200 kg/h |
LDY-120PW-14X | 2450±50HZ | ≤135KW | ≥120KW | 17500 × 1400 × 2000 mm (customizable) | ≥120kg/h | Approximately 1200–1400 kg/h |
LDY-150PW-18X | 2450±50HZ | ≤165KW | ≥150KW | 19500 × 1400 × 2000 mm (customizable) | ≥150kg/h | Approximately 1500–1800 kg/h |
LDY-200PW-18X | 2450±50HZ | ≤220KW | ≥200KW | 23500 × 1400 × 2000 mm (customizable) | ≥200kg/h | Approximately 2000–2500 kg/h |
LDY-250PW-20X | 2450±50HZ | ≤265KW | ≥250KW | 28500 × 1500 × 2000 mm (customizable) | ≥250kg/h | Approximately 2500–3000 kg/h |
LDY-300PW-24X | 2450±50HZ | ≤320KW | ≥300KW | 31500 × 1500 × 2000 mm (customizable) | ≥300kg/h | Approximately 3000–3600 kg/h |
LDY-350PW-28X | 2450±50HZ | ≤370KW | ≥350KW | 34500 × 1700 × 2000 mm (customizable) | ≥350kg/h | Approximately 3,500–4,000 kg/h |
LDY-400PW-30X | 2450±50HZ | ≤43KW | ≥400KW | 38500 × 1950 × 2000 mm (customizable) | ≥400kg/h | Approximately 4000–5000 kg/h |
Q: Will fresh wood ear mushrooms burst or spatter when fed directly into the microwave dryer?
A: No. Longdiya equipment uses variable-frequency soft-start power control: the first 5 minutes operate at low power for preheating and surface moisture release, allowing micro-channels to form on the mushroom surface before power is gradually increased. This eliminates the risk of internal steam pressure causing rupture.
Q: What is the shelf life of microwave-dried wood ear mushrooms?
A: Under sealed, moisture-proof packaging, microwave-dried and simultaneously sterilized wood ear mushrooms can be stored at ambient temperature for 18–24 months without any preservatives.
