Double-strand core process
Cost-efficient Profiles in Double-strand Solution
Profile manufacturer Schüco International KG recently cooperated with KraussMaffei Berstorff GmbH, Hanover, Germany, and Greiner Extrusion, Nussbach, Austria, in a new profile production project. In the production process for the plastics profiles, Schüco takes advantage of core technology, since this allows cost-saving regrind to be used for the profile core, while the outer visible areas can be covered with virgin material. In the double-strand extrusion process, two profiles can be produced at the same time. This reduces both the capital investment and the required floorspace for the extrusion line. Besides die design, the main challenges of this project were to split up and manage the melt streams and to come up with a cost-effective extruder concept. The material ratio in Schüco’s main window profiles is around 60% virgin material and 40% regrind. In the new system, two extruders supply both strands. The melt streams are split via a pressure-optimized channel system so that they reach the dies in the required pattern. The production line consists of two separate KMD 90-36/P extruders from KraussMaffei Berstorff, each on its own base frame. The main control units are positioned at a distance from the extrusion line. The die control circuits and the operator panels are housed in two compact control units close to the extruder output zone. The two extruders can be operated separately or in synchrony, giving Schüco maximum flexibility to respond to future requirements.
KraussMaffei Berstorff GmbH
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