Hybrid & Combination Drying

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Introduction

Kerone’s Vacuum & Microwave Hybrid Dryer combines two powerful principles: reduced pressure, which lowers the boiling point of water, and microwave energy, which heats the moisture inside the product from within. Under vacuum, water can evaporate at temperatures of roughly 40 to 60 degrees Celsius, depending on the pressure level, while microwaves deliver energy volumetrically so that internal moisture is driven outward quickly instead of waiting for slow conduction from the surface. The result is rapid drying at low product temperature, which is especially valuable for materials that lose colour, aroma, potency or structure under conventional heat. Many fruit and vegetable pieces also expand into a light, crisp, porous texture because vapour pressure builds up inside the tissue as it dries. This technology is widely known as vacuum microwave drying (VMD), and Kerone engineers it as a robust production machine with controlled power, safe shielding and dependable vacuum performance for food, nutraceutical and pharmaceutical processors.

Why Choose Kerone Vacuum & Microwave Hybrid Dryer

Microwave vacuum drying is unforgiving when poorly designed, because uneven fields, hot spots and electrical discharge at certain pressures can damage both product and equipment. Kerone addresses these risks from the start. Our cavities are designed for field uniformity and often combine multiple magnetron feeds with a rotating drum or turntable so that every piece receives balanced exposure. Power is modulated according to product load and moisture level, preventing the runaway heating that can occur in nearly dry material. Vacuum systems are sized for the vapour load and equipped with condensers or cold traps to protect the pump and recover volatiles when required. Microwave leakage shielding, door interlocks and discharge-detection logic are built in as standard design practice. Because we treat the cavity, vacuum circuit and control software as one system, customers obtain predictable drying curves, consistent crispness and gentle handling of delicate actives. Kerone also supports sample trials so you can confirm power, pressure and time settings before scaling up.

Types and Features of Vacuum & Microwave Hybrid Dryer

Kerone builds Vacuum & Microwave Hybrid Dryers as batch cavity units for laboratories and small production runs, rotating-drum models for free-flowing pieces and granules, and larger multi-magnetron systems for commercial throughput. Continuous designs using airlocks or semi-continuous loading chambers are available for high-volume food lines. Microwave frequency is selected to suit the application, with 2,450 MHz widely used for compact cavities and 915 MHz considered where deeper penetration and larger loads are required. Power can be supplied by air-cooled or water-cooled magnetrons or solid-state sources, with generators individually switched to provide fine control. Vacuum is generated by liquid-ring, dry screw or rotary-vane pumps, usually protected by a vapour condenser. Typical features include fibre-optic or infrared temperature sensing, pressure-power interlocks, programmable drying recipes, glass or polymer drum liners that are microwave-transparent, and sanitary, easily cleaned internal surfaces.

Key Features

  • Volumetric microwave heating: Energy penetrates the product, evaporating internal moisture quickly instead of relying on slow surface conduction.
  • Low-temperature vacuum environment: Reduced pressure lets water evaporate well below 100 degrees Celsius, protecting heat-sensitive compounds.
  • Puffed, crisp texture: Internal vapour pressure creates an open, porous structure ideal for crunchy snacks and rapidly rehydrating ingredients.
  • Hot-spot prevention: Rotating drums, turntables or multiple feed points distribute microwave exposure evenly across the load.
  • Adaptive power control: Power is reduced automatically as moisture falls, preventing overheating or scorching at the end of the cycle.
  • Discharge and arcing protection: Pressure-power interlocks and sensors guard against plasma discharge that can occur at certain vacuum levels.
  • Volatile and solvent handling: Condensers and cold traps protect the vacuum pump and can recover aromatic or solvent vapours.
  • Safe, shielded design: Choke seals, door interlocks and leakage monitoring keep operators protected during operation.

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Applications of Vacuum & Microwave Hybrid Dryer

Kerone’s Vacuum & Microwave Hybrid Dryers are extensively used in industries that handle premium, heat-sensitive or texture-critical materials. Typical applications include:
    • Producing crunchy dried fruit and vegetable pieces such as berries, apples, mango and carrots.
    • Drying herbs, flowers and botanical extracts while preserving volatile oils and colour.
    • Processing pharmaceutical granules, intermediates and certain active ingredients at low temperature.
    • Making cheese snacks and other dairy-based crispy products.
    • Drying probiotic cultures, enzymes and other bioactive ingredients that lose activity under heat.
    • Removing residual moisture or solvents from specialty chemicals and fine particulates.
Kerone’s Vacuum & Microwave Hybrid Dryer delivers fast, gentle and highly controllable drying for products where quality cannot be compromised. By pairing the low boiling point of water under vacuum with the penetrating heat of microwaves, it shortens cycle times, retains colour and active compounds, and creates attractive porous textures that are difficult to achieve with conventional dryers. With uniform field design, adaptive power control and strong safety systems, the equipment is built for stable, repeatable production. Share your product details and capacity goals with Kerone, and our engineers will help determine suitable pressure, power and cycle settings, and recommend the model that best matches your process.

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Frequently Asked Questions (FAQ)

  • Vacuum lowers the boiling point of water so it evaporates at gentle temperatures, while microwaves supply heat inside the product. Used together, they remove moisture fast without exposing the material to damaging temperatures.

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