Continuous manufacture of brushing strips for electrical pick-up from overhead wires, fires carbon, additives and layered conductors to form composite.

Abstract
Gegenstand der Erfindung ist ein Verfahren zur kontinuierlichen Herstellung eines Materialverbundes und einer daraus herzustellenden Schleifleiste, bestehend aus einer Matrix von gebranntem Kohlenstoff mit waermebehandeltem Binder und aus lagenweise darin enthaltenen duennen metallischen Leitern. Der Materialverbund hat eine Dichte von kleiner oder gleich 2,3 g/cm<3< und weist einen parallel zu den Lagen der duennen metallischen Leiter gemessenen mittleren spezifischen elektrischen Widerstand von kleiner oder gleich 3 < 

EP 1564063 A UPAB: 20050915 NOVELTY - Following mixing and before firing with hydrogen as a protective atmosphere, a compressed profile (1) is roller-compacted continuously. It comprises green (unfired) carbon material (pyrolytic carbon plus additives and binder) with thin metallic conductors (2). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the composite so produced. USE - For continuous manufacture of a composite used for e.g. pantograph brushing strips, containing carbon and conductors. To make brushing strips for sliding pick-up of electricity, for operating vehicles with electric motors (claimed). ADVANTAGE - A particular advantage of the process, is continuous- and therefore economical manufacture, which has not been described previously. There are no limitations or high costs associated with conventional individual pressing of strips, or with extrusion of a completely-uniform structure. The electrical brushing strip produced, comprises a matrix of fired carbon with heat-treated binder, containing layered, thin metal conductors (2) in the required orientation, with desirable properties for this application. The density is 2.3 g/cm3 or less. Parallel to the layers, the mean specific resistance is measured at 3 mu Omega m. The composite contains less than 5% metal.