Commercial mixers can make easy work of producing huge quantities of bread dough and batters. But the mechanical forces created by the those mixers as they churn through heavy, sticky, voluminous ingredients can cause agitator and motor stress, seal failures and even shaft leakages – unacceptable risks in the highly regulated food and beverage industry.
Freudenberg Sealing Technologies Process Seals (FST) today introduced a new family of Polytetrafluoroethylene (PTFE) radial shaft seals designed to withstand high temperatures, high speeds and increased shaft runout. The seals, part of the Simmerring Radiamatic HTS II EWS family of products, offer industrial users an alternative to mechanical face seals by combining a PTFE shaft sealing ring and flexible bellows element in one application.
FST will display its Radiamatic HTS II EWS products – and others – at drinktec 2013, a food and beverage trade fair in Munich, Germany Sept. 16-20.
PTFE shaft sealing rings have established themselves as reliable sealing elements over decades of use in the process and food industries. Their nearly ubiquitous chemical resistance to a multitude of industrial fluids and cleaning agents and their ability to withstand high temperatures makes them an irreplaceable product solution.
When strong mechanical forces produce increased shaft runout, however, conventional PTFE shaft seals can demonstrate poor recovery behavior. The resulting lift produced in the lip seal of a conventional PTFE shaft seal ring can cause leakage, especially at low rotation speeds. FST’s unique Radiamatic HTS II EWS products are made to withstand increased shaft runout by combining PTFE shaft sealing rings with PTFE bellows to prevent runout separation and leakage.
The Simmerring Radiamatic HTS II EWS – for increased shaft runout – was developed to offset the poor resilience of PTFE shaft sealing rings. The EWS combines lip seal and ferrule technology of the Radiamatic HTS II with bellow elements and a slide bearing. The arrayed folds provide the shaft sealing ring with greater flexibility to absorb the kinetic energy transferred by the slide surface. The novel design thus offers an efficient solution for the application in mixing systems.
Additionally, Simmerring Radiamatic HTS II EWS products withstand high temperatures and speeds – “HTS” – with six different configurations that offer reliable seal applications in a variety of industrial applications. Based on a modular principle, both the type and alignment of the lip seals as well as the PTFE material can be adapted to the individual use. This flexibility offers customers tremendous advantages when fabricating their own components and products. And the Simmerring Radiamatic HTS II products offer customers access to fast, off-the-shelf solutions to special, high performance seal requirements.
The Simmerring Radiamatic HTS II products have unrivaled low friction coefficients. The lip seal is designed in such a way that a precisely defined contact surface remains virtually constant under all operating conditions. A design with almost no dead spots makes it the first choice for manufacturers of mixers and kneaders in the food and beverage and pharmaceutical industries. The HTS II also features a homogeneous PTFE surface which cannot be harmed by aggressive fluids and cleaning agents.
Freudenberg Sealing Technologies