Food & Beverage Reporter August 2018

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PROCESSING DEFROSTING REVOLUTION How RF works These drawbacks of conventional defrosting methods can be avoided thanks to the ability of RF’s electromagnetic fields to rapidly generate heat volumetrically within the product. The heating process is fast, uniform and controlled, resulting in a significant reduction of drip losses and minimising product deterioration caused by bacterial growth. Olaf says the RF method offers flexibility in production scheduling, and is the ideal solution for many tempering, softening and defrosting processes. The product is placed on the machine’s conveyor belt and is transferred continuously through the RF unit (tunnel), passing between upper and lower electrode plates. These electrodes form an electrical capacitor and the product moving between the plates becomes the dielectric element of that capacitor. The electrode plates are connected to a radio frequency generator oscillating at a frequency of several million cycles per second. When the RF generator applies high frequency alternating voltage between the capacitor plates, the dipolar water molecules of the frozen product will vibrate and rotate, attempting to align themselves according to the fastchanging opposite plate polarities. This phenomenon causes intermolecular friction, which will in turn generate heat rapidly and uniformly within the whole product mass regardless of its size, weight, shape and thermal conductivity. The amount of heat generated inside the product and the defrosting time are accurately controlled through the voltage applied on the electrode plates and the speed of the conveyor belt. Benefits of RF • Defrosting is achieved in minutes rather than hours/days, even for large product blocks and, if necessary, directly inside the packaging used for storage or retail distribution (carton boxes, polyethylene bags, etc.); • The process speed and uniformity minimise the risk of product degradation (drip losses, deterioration of sensorial, chemical and physical characteristics, bacteria growth, etc.), thus helping to preserve best product quality; • The product can be obtained at the correct temperature needed for the next stage of processing; • Thanks to the high process speed, radio frequency defrosting can be carried out continuously, with significant advantages in product handling and production scheduling. Production can be organised according to "just-in-time" criteria - a great advantage in the case of sudden orders, last-minute changes etc; • Weather and external ambient conditions do not affect the process, so it can be controlled accurately and consistently; • RF equipment requires much less floor space compared to the traditional, large defrosting rooms/ equipment; relevant process costs can also be reduced drastically compared to conventional techniques. Olaf is convinced that, as in much of the rest of the world, RF defrosting will become the technology of choice for food processors in Africa who are serious about quality and safety. “After the recent Listeria outbreak, manufacturers are realising that there’s nowhere to hide when it comes to food safety, and a critical hazard point is defrosting. RF will help manufacturers – and their customers.’’ The RF heating process is fast, uniform and controlled, resulting in a significant reduction of drip losses and minimising product deterioration caused by bacterial growth. • Butcher and Meat Processing Equipment (BMPE) is a leading supplier of superior quality new and refurbished meat processing equipment to the African market. The company provides a professional service to the food industry in equipment, spares and latest technological innovations. www.bmpe.co.za Tel: +27 11 664 8212 CALL US FOR ALL YOUR EQUIPMENT REQUIREMENTS Various machines - ranging from Vacuum Tumblers, Injectors, Sausage Fillers, Vacuum machines, Clippers and many more.... Pallet washer Brine Injector Vacuum Tumbler Hygiene Station Crate Washer/Sanitiser Bowl Cutter • Tel: +27 11 664 8212 • Email: info@bmpe.co.za • www.bmpe.co.za Branches in Johannesburg and Cape Town
COLD CHAIN Digital is transforming the cooling industry <strong>Food</strong> wastage is a global problem, and the United Nations’ FAO estimates a third of all the food produced for human consumption around the world is lost or wasted. If one fourth of this food is saved, it could feed 870 million people. In SA and developing countries, the FAO estimates the direct cost of this food loss is about $310 billion. With this in mind, Danfoss, a global leader in engineering technologies, has come up with a cloud-based retail solution called the Smart Store to improve the cold chain – and ultimately reduce food waste. According to Roy Naidoo, refrigeration and air conditioning sales manager of Danfoss Sub- Saharan Africa, the Smart Store solution will reduce food loss and wastage that happens at the retail level. “We believe that the Smart Store solution is the supermarket of tomorrow, integrating control of refrigeration, HVAC, lighting and other applications, to enhance food safety and maximise energy efficiency from case to cloud,” says Naidoo. The Smart Store utilises the Internet of Things to link every system in a store, monitoring the performance of equipment, revealing opportunities to improve efficiency and ensuring ideal conditions for food in temperaturecontrolled environments. Through Big Data, stores are also equipped with self-learning components and solutions that intelligently predict failure and trigger maintenance. This will achieve close to zero downtime and is not only good for the environment but also saves costs. Danfoss is currently part of a joint venture with scientists, innovators and retailers trying to transform supermarkets into energy producers. The Smart Store utilises the Internet of Things to link every system in a store, monitoring the performance of equipment, revealing opportunities to improve efficiency and ensuring ideal conditions for food in temperature-controlled environments. New technology will give supermarkets the ability to capture excess heat that they create, and then store it, reuse it in their own systems or by connecting to the local district heating grid, redistribute it to the surrounding community. “We believe by integrating cuttingedge technology, supermarkets are going to transform and become the centre of their communities. There are currently more than 9 000 Danfoss Smart Stores worldwide, and we believe that these stores will provide both the food and energy needed for sustainable future growth, while also helping to reduce food waste in South Africa and around the world,” says Naidoo. www.danfoss.com www.fbreporter.co.za FOOD & BEVERAGE REPORTER | AUGUST <strong>2018</strong> 27
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Food & Beverage Reporter August 2018

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