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Primary processing: PUR spray system controls application
German automotive components supplier Duramotive Bayern GmbH is using a polyurethane (PUR) spraying process developed by KraussMaffei (KM) for the production of acoustic carpet elements for cars and trucks. KM says the technology has cost and process advantages compared with other soundproofing methods, reportedly reducing material consumption, offering flexibility, and lowering mold costs.
MPW Staff
January 26, 2009
1 Min Read
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PUR spray system
German automotive components supplier Duramotive Bayern GmbH is using a polyurethane (PUR) spraying process developed by KraussMaffei (KM) for the production of acoustic carpet elements for cars and trucks. KM says the technology has cost and process advantages compared with other soundproofing methods, reportedly reducing material consumption, offering flexibility, and lowering mold costs. The soundproofing PUR layer, which is sprayed onto preformed carpet elements in an open mold using a special spray mixing head, has a high barium-sulphate content. The spray-mixing head is robot mounted and follows a software-controlled path, while layer thickness and location can be varied, reducing material usage. KM notes that the abrasive nature of barium sulphate posed a challenge for the PUR metering system, and to minimize wear, the polyol/barium sulphate mix is metered using piston metering, with KM’s Tandem Hybrid metering machine feeding the abrasive compound via two pistons that move anticyclically to deliver a steady material flow.The system’s “T” mixing discharges polyol into the mixing chamber through two nozzles opposite each other, with the isocyanate and polyol streams hitting at right angles. This mixing-head design reportedly achieves good mixing quality and a stable spray jet, even when materials are processed at relatively low pressures and temperatures. KM says the ultimate advantages are twofold: a wider processing window and less stress on the material.
KraussMaffei Technologies GmbH, Munich, Germany; +49 (0) 89 88 99 0; www.krauss-maffei.de
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