Radio Frequency Meat and Seafood Defroster & Tempering Machine
Why Radio Frequency Defrosting and Tempering is replacing Conventional Thawing in the Food Processing Industry
For decades, meat and seafood processors have relied on conventional thawing, which are slow, wasteful processes that take 24 to 48 hours, cause around 6% product weight loss through drip, and create significant bacterial risk. Strayfield’s Radio Frequency (RF) defrosting machines eliminate these problems entirely, replacing conventional thawing with a continuous, in-line process that tempers frozen product from -18°C to -2°C in under 15 minutes
How Radio Frequency Defrosting Machines Work
Strayfield RF defrosting machines use electromagnetic energy to generate volumetric heat directly within the frozen product, unlike conventional thawing methods that heat from the outside in. RF energy at 27.12 MHz penetrates the entire product simultaneously, delivering uniform temperature profiles across the full 1,400mm belt width. A standard frozen block is tempered from -18°C to -2°C in under 15 minutes, eliminating the 24 to 48 hour wait of conventional thawing. Our proprietary low density flat plate electrode design generates a gentle, uniform RF field that simultaneously heats the product from core to surface and helps eliminate drip loss of about 6% which is usually found in conventional thawing methods, directly improving yield and product quality.
Benefits of Strayfield’s rapid defrosting for the food industry
Increased Efficiency
RF defrosting replaces slow batch thawing with a continuous, in-line process. Frozen meat, fish and seafood are tempered from -18°C to -2°C in under 15 minutes, enabling just-in-time defrosting that feeds directly into automated production lines without the downtime and floor space of conventional thawing rooms. This also helps reduce bacterial load and eliminate the about 6% drip loss associated with thawing methods
Improved Quality
Unlike conventional thawing that heats product from the outside in, RF defrosting delivers uniform volumetric heating throughout the product simultaneously. This eliminates surface overheating, preserves texture, colour and nutritional value, and ensures consistent temperature profiles from surface to core across every batch
Flexible Product Compatibility
Strayfield RF defrosting machines process both naked product and packaged formats including carton boxes, polyethylene bags and plastic crates. Equally suited to IQF thawing applications, the uniform low density RF field defrosts individually quick frozen products without clumping or uneven temperature distributions.
Defrosting Fish and Seafood with Strayfield
RF Defrosters: Efficiency and Preservation of Texture
Strayfield RF defrosting machines are equally effective for fish, seafood and IQF thawing applications. The delicate texture and quality of fish and seafood make conventional air and water thawing methods particularly damaging, as surface heating causes moisture loss and texture degradation before the core has thawed. Strayfield’s low density flat plate electrode design generates a gentle, uniform RF field that defrosts fish and seafood uniformly from surface to core, preserving quality and reducing the drip loss of conventional thawing. Compatible with naked product, carton boxes, polyethylene bags and plastic crates
Technology Advantages
- RF technology enables continuous flow lines, allowing for high productivity rates. Unlike traditional methods that require batch processing or individual handling, Strayfield’s RF tempering machines can be integrated into automated production lines, ensuring a continuous and efficient thawing process. This eliminates downtime between batches, resulting in increased overall productivity.
- Uniform thawing is crucial to minimize drip losses in the defrosting process. RF technology provides a consistent and controlled heating environment, ensuring an even thawing rate across the entire product. This uniformity helps to preserve the quality and integrity of the food, reducing the loss of valuable juices and moisture.
- Short processing times are advantageous in minimizing the growth of microbes during thawing. RF technology offers rapid and precise heating capabilities, allowing for extremely short processing times. The quick and efficient thawing process limits the exposure of the product to temperatures that promote microbial growth, effectively reducing the risk of bacterial contamination.
- RF systems can be designed to occupy a relatively smaller footprint compared to traditional thawing methods. This reduction in floor space requirement is beneficial for food processing facilities where space optimization is crucial. By utilizing RF technology, companies can make the most efficient use of their available floor area, optimizing their overall operational efficiency.
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 thawing.
Differences between RF and Microwave Technologies
RF technology uses high-frequency electromagnetic fields to heat and thaw materials, usually at 27.12 Mhz. The energy penetrates the material and generates heat through the friction created by the movement of water molecules.
Microwave technology uses ultrahigh frequency traveling electromagnetic waves to heat and thaw materials, usually at 915 Mhz or 2.45 Ghz. The energy is absorbed by the material, causing the molecules within it to vibrate and generate heat. Microwave technology is commonly used in household appliances, such as microwave ovens, and is suitable for small-scale and batch production
Put simply, RF technology uses lower frequencies i.e. longer wavelengths compared to microwave technologies. This allows RF energy to penetrate deeper into the material and generate heat more homogeneously from the core to the surface. The longer wavelength also allows the electromagnetic field to spread more uniformly over a wide conveyor belt thereby providing uniform field intensity over a long and wide defrosting tunnel. The following are key advantages of RF vs Microwave in industrial tempering:
Efficiency
RF technology is more efficient than microwave technology at large volumes from an investment & productivity standpoint. Lesser number of power modules are required as compared to Radio Frequency generators, also the need for gantry systems does not exist. Conveyor belts in RF defrosting machines are wider allowing for slower and gentler defrosting at the same productivity level
Capacity
RF technology is suitable for large-scale production, while microwave technology is better suited for small-scale applications. This is because, RF energy has the capability to penetrate large volumes of mass evenly/uniformly as opposed to microwaves. This allows RF defrosting to achieve average temperatures of -2 °C much easier than microwave systems which usually work better upto -4 °C
Dielectric properties
The dielectric loss factor of ice below -10 °C is much lower at microwave frequencies, estimated to be almost 29 times lower, as compared to RF frequencies. A low dielectric loss factor would result in higher energy consumption to heat up the same mass of ice as compared to RF thus resulting in extremely inefficient heating of deep-frozen materials
A case study on RF tempering using Strayfield
Discover how our RF defrosting technology is setting new standards in the food industry. Dive into our case study on butter defrosting to see how our units ensure rapid and consistent tempering without compromising quality.
| Machine / Product | Boneless Chicken Thigh | Pork Belly | Surimi | Fruit Puree | 100% Fat | Whole Fish | Shrimp | Lean Meat |
|---|---|---|---|---|---|---|---|---|
| 25kW | 550 | 300 | 450 | 375 | 550 | 450 | 450 | 450 |
| 50kW | 1,100 | 600 | 925 | 725 | 1,100 | 925 | 925 | 925 |
| 75kW | 1,700 | 950 | 1,400 | 1,100 | 1,700 | 1,400 | 1,400 | 1,400 |
| 100kW | 2,200 | 1,300 | 1,800 | 1,400 | 2,200 | 1,800 | 1,800 | 1,800 |
| 50kW x 2 | 2,200 | 1,300 | 1,800 | 1,400 | 2,200 | 1,800 | 1,800 | 1,800 |
| 75kW x 2 | 3,400 | 2,600 | 2,800 | 2,200 | 3,400 | 2,800 | 2,800 | 2,800 |
*All figures are tentative. Production rates may be higher or lower based on final product presentation and process requirements
Defrosting Lines For
