Strayfield RF Heating & Drying – A proven technology refined through innovation

Strayfield is a global leader in advanced Radio Frequency (equipment) and thermal processing machinery, boasting thousands of machines on six continents that can achieve maximum results with reduced costs. With an impressive range from 1.5 to 600 kW output ratings – each complete with the option for computer control or even mobile app integration – Strayfield’s RF equipment ensures reliability and flexibility anytime you need it!

How Strayfield Technology Works

How RF Works

RF Mechanism

The RF heating mechanism is based on the dielectric properties of the material being processed. Dielectric properties are the electrical properties of the material that determine how well it interacts with electromagnetic energy. Materials with a high dielectric loss factor, such as water and many organic materials, are particularly suitable for RF heating and drying. When RF energy is applied to the material, the oscillating electrical field causes the molecules in the material to constantly re-align with the field. This re-alignment generates heat due to molecular friction.

Water and organic materials interact well with RF energy because they have high dielectric loss properties. This is because water and organic materials have polar molecules (shown in adjacent image), meaning they have a positive and negative end. When the electric field of the RF energy is applied to these materials, it causes the molecules to rotate rapidly, which generates heat due to molecular friction. This frictional heat causes the material to heat up and dry.

Put simply, Dielectric loss is the measure of the ability of a material to convert the energy of an electromagnetic field into heat.

RF Drying Mechanism

RF drying works by heating the material and evaporating the moisture within it. As the material heats up, the moisture within it begins to evaporate, and the vapor is removed by an air flow. The process can be accelerated by creating a vacuum or by reducing the relative humidity of the air flow. The rate of drying depends on several factors, such as the moisture content of the material, the temperature, and the airflow.

Technology Advantages

  • Achieve Uniform Heating and Drying by heating the entire cross-section of the product at the same rate. Reducing total drying time and improving product quality through a reduction in exposure time.
  • High depth of penetration as compared to microwave heating
  • Targeted heating of water molecules that ensures economic drying of materials that even exhibit thermally insulating properties, that are extremely hard to heat and dry through conventional means
  • Achieve high rate of productivity with continuous flow lines
  • Profiles moisture through the product cross-section ensuring uniformity in dryness.
  • Significantly reduces energy consumption by targeting only water molecules during the heating process
  • Reduction in floor space as lower residence times are needed
  • Extremely safe to operate as the technology does not operate at very high temperatures.
  • Fossil fuel and chemical free. Compliant with long-term ESG mandates.

Strayfield Advantages

  • Energy efficiency: Highest energy efficiency in the industry
  • Filtered Oscillator design: Strayfield is the only manufacturer with a filtered oscillator design that adheres to EN55011 and is truly CE compliant
  • Double electrode balanced output: Isolated energy in the area of application that minimises the return current paths through the structure of the machine, thereby reducing RF emissions and improving efficiency.
  • Automatically adjusting electrodes that ensure controlled power and unmatched arc suppression
  • Flat electrodes: Lower power density as opposed to rod electrodes, ensuring uniform and gentle heating & drying
  • Dual Extraction Design

RF Heating & Drying Applications

Our expertise and technology has been implemented on 4000+
installations across various applications



Radio Frequency dryers for textile packages, hanks, tops & loose fibers

Post Baking

Post Baking

Radio Frequency dryers for energy saving,
reduced process times & enhanced quality


Foods and Spices

Radio Frequency heaters for a wide variety of ready to eat food products and spices

Defrosting and Thawing

Defrosting and Thawing

Radio Frequency temperers for a uniform temperature profile



Radio Frequency dryers for ceramics
& thermally insulating materials


Dis-infestation and sanitisation

Radio Frequency heaters for high volume & continuous flow disinfestation and sterilization


Latex and Foam

Radio Frequency dryers for increased productivity


Fiber Glass

Radio Frequency dryers for quality drying of fiber glass rovings

Web and Sheet Drying

Web & Sheet Drying

RF Dryers for bookbinding, matchboxes, coated paper & water-based inks and adhesives



RF heaters & dryers for wood laminates, pulp, leather, cosmetics & pharmaceutical ingredients


  • Elimination of dye migration & yellowing
  • 100% consistency in moisture profiling
  • 30% more economical than traditional drying methods
  • Up to 40% more yield with the existing oven size
  • Elimination of product checking
  • Minimal moisture variation across the product
Latex and Foam
Latex and Foam
  • Complete removal of product yellowing
  • 50% more yield for faster time to market
  • 100% consistency: delivering desired moisture and quality across the product
Defrosting and Thawing
Defrosting and Thawing
  • Virtually no drip loss
  • Near 100% temperature consistency across the product profile
  • Significant reduction in bacterial growth & propagation

FAQs for RF Heating & Drying

What is RF heating?

RF heating refers to the process of using radiofrequency (RF) energy to generate heat in a target material or substance. RF heating involves the application of high-frequency electromagnetic energy, to induce molecular or atomic vibrations within the material. These vibrations generate friction and heat, leading to a rise in temperature.

What are the benefits of RF heating?

RF heating offers several benefits:

  • Efficiency: It efficiently converts electrical energy into heat energy, reducing waste and costs.
  • Rapid and Uniform Heating: It provides fast and uniform heating, reducing processing times.
  • Selective Heating: It can heat specific materials or regions without affecting surrounding areas.
  • Non-contact Heating: It doesn’t require physical contact, eliminating contamination or damage risks.
  • Versatility: It can be applied to various materials and shapes.
  • Temperature Control: It allows for precise temperature control, preventing overheating or damage.
  • Safety: It is safe when precautions are taken, minimizing risks associated with other methods.

Overall, RF heating offers efficient, controlled, and versatile heating solutions in different industries.

What materials can be heated using RF energy?

RF energy can be used to heat a wide range of materials, including plastics, rubber, textiles, wood, paper, and food products. The specific material properties will determine the effectiveness of RF heating.

What is RF drying?

RF drying, also known as radiofrequency drying, refers to the process of utilizing radiofrequency (RF) energy to remove moisture from materials or products. It is a method of drying that harnesses electromagnetic energy in the RF range to generate heat through intermolecular vibrations within the material, leading to the evaporation of moisture.

What are the benefits of RF drying?

RF drying can offer several benefits over other drying methods, including faster drying times, more uniform drying, and better preservation of the material’s quality. It can also be used to dry materials that are difficult to dry with other methods.

What materials can be dried using RF energy?

RF energy can be used to dry a wide range of materials, including food products, pharmaceuticals, textiles, ceramics, paper and thin substrates, organic material, fiberglass, etc. The specific material properties will determine the effectiveness of RF drying.

Welcome to Monga Strayfield, the Benchmark for High Precision Heating and Drying Technology.

Get in touch

Bhosari Industrial Estate,
M.I.D.C. Bhosari, Pune - 411 026

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