safety, but it’s not the only one. In a production line where time is money and productivity is king, a seal that’s effi cient to produce, without compromising quality, is a must. The magic of induction heating The first Tetra Pak sealing method was based on impulse heating, which applied heat through physical contact. However, it took a relatively long time to reach the melting temperature of the polyethylene, cool it, and then reheat it slightly to release the material from the clamp. Another problem was that it left burn marks on the package due to the high temperature. After intensive research, induction heating (IH) – the transfer of energy without physical contact– and some patented ideas from Tetra Pak, a solution was found. Sealing only where it’s needed A prerequisite for IH is an aluminum layer in the laminating board, which conducts electricity. A high-frequency magnetic field is used to induce an PROTECT YOUR PRODUCTS | HYGIENE electrical current into the aluminum, which generates the heat. This in turn melts the polyethylene layer and thus enables sealing only where needed. Since the heat generation is so local, brief and intense, only the sealed part is affected by the heat – not the paper or the food product. Today some 80% of of Tetra Pak packages are sealed using induction heating. Protection every step of the way Our filling machines surpass US FDA and EU legal requirements. They benefit from some of our latest patent technologies, such as thermal carpet technology, which was inspired by methods used in Formula One racing. In the latest Tetra Pak A3 platform, this technology keeps the peroxide bath at the optimum sterilisation temperature. Our processing and filling machines have the fewest possible welds and easy-to-clean surfaces. The same goes for our distribution equipment that protects your product all the way to the consumer – like crate packers made of 90% stainless steel with smooth surfaces designed for maximum hygiene. Can a fi lling machine take a lesson from a dishwasher? When our filling-machine team wanted to take hygiene to a whole new level, they began at the beginning: By looking for a better way to keep the machine itself immaculate. Two goals Their goals were twofold: to clean as an integrated part of the filling process – and to do it better than manual processes. Inspiration from a familiar helper They looked to a familiar household helper for inspiration. A dishwasher’s pressurized streams of water evenly apply chemicals and then thoroughly remove them. Wouldn’t something similar do wonders for a filling machine? Consistent, thorough cleaning every time So they designed a built-in system with high-velocity spinning nozzles that apply temperature-controlled water and preset concentrations of chemicals. It ensures consistent, thorough cleaning every time. The TR/27 and TR/28 filling machines were introduced in 2009, and step one of the XH (extended hygiene) filling system had fallen into place, making it the best performing hygiene platform on the market.
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- Fall '13
- Tetra Pak, Aseptic Processing