27/04/2011

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Hennecke presents new process technology at JEC

One engineering approach addresses the growing requirements regarding efficiency and environment in the automotive sector - the manufacture of fibre-reinforced structural components in the high-pressure RTM process (HP-RTM). In contrast to the classical RTM process, this new technology enables the reactive mix to be quickly injected into the cavity. This means that curing times are very short and this guarantees optimised cycle times for the whole process, allowing even high numbers to be produced in an appropriate way. Another innovation presented by Hennecke enables the use of fillers in reactive PU mixtures. The new technology was developed in close cooperation with Bayer MaterialScience. Unlike the batch process where the filler is added to a medium component before the components are mixed, fillers can now be fed in an air stream and injected into the mixing chamber during the mixing phase. The Solid Injection by Airstream (SIA) technology opens up new possibilities for the use of composite materials, regardless of whether they are hard or soft, or if the polyurethane is a solid or a foam. One possible area of application is adding flame retardants to polyurethane parts, which is required for a variety of applications. The method enables the use of very light or heavy fillers, or also the combination of different types. Even reactive substances or particles with porous surfaces can be used. This reduces the probability of changes to the fillers and the wear of plant components due to abrasive or corrosive additives. The technology also makes it possible to vary the filler content within a layer or between different layers, such as in a sandwich composite, for example. BMS operates a pilot plant employing the method in Leverkusen. Apart from the new technologies, Hennecke exhibited sample parts from the automotive and sanitary sectors that are implemented with its PUR-CSM spray technology (Polyurethane Composite Spray Moulding). For this purpose, light and yet very robust sandwich composite parts with honeycomb structures were on display.

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