core sector communique

Coextrusion solutions from KraussMaffei Berstorff for efficient production of window profiles

(Munich, July 27, 2012) KraussMaffei Berstorff is taking account of the trend in window profile extrusion towards greater use of recyclables and fillers by offering a large number of flexible and space-saving coextrusion models. Systems from KraussMaffei Berstorff help profile manufacturers to reduce their material costs enormously, thereby ensuring economical production. The KMD 53 K/P model, which was recently launched on the market, completes the series of conical twin-screw extruders for the medium output range and extends the wide range of coextrusion solutions.

Future-oriented coextrusion for fillers and recyclables "Our coextrusion models provide processors with a concept with which they can manufacture a premium quality end product using cost-effective raw materials", explained Peter Oswald, Director of the Profile Extrusion Product Group at KraussMaffei Berstorff. "Our machine combinations are ideally suited for window profile production based on the standard market technologies, e.g. core technology, layer technology and combination technology. Thanks to our wide range of premium quality products, we can also cope with every customer-specific production requirement", emphasized Oswald. The use of large quantities of fillers is growing continuously since processors use them to produce the invisible profile core which is covered by a thin external layer of a colorfast new material. In addition to dwindling recyclables, producers are increasingly utilizing dry blends from materials with a low additive proportion, but a high filler proportion. The type of application, but also the available production space determine the extruder arrangement. Depending on the output of the individual layers, a coextruder from KraussMaffei Berstorff can be used both to process the core layer and the top layer. For example, the conical KMD 63 K/P coextruder in a KraussMaffei Berstorff coextrusion arrangement containing a parallel twin-screw extruder in core technology extrudes the invisible core; however, it can also be used in layer technology to produce the outer layer of the profile. Twin-screw extruders with proven screw concepts for modular use The process concept of parallel and conical twin-screw extruders from KraussMaffei Berstorff ensures optimum melt homogeneity and permits processing of many different formulations with just one screw geometry. When designing the conical screws, KraussMaffei Berstorff paid close attention to the increased requirement relating to the pressure stability of the conical extruders. The screws in all series are molybdenum-plated and provide, when combined with the deep-nitrided barrels, active wear resistance, especially during processing of recyclables and dry blends with high filler proportions. All models, both the parallel and conical twin-screw extruders, impress customers with their modularity, flexible processing technology and ease of handling. The conical coextruders are available as a stand-alone version; they can be easily moved and quickly shifted in all directions.