EuroWire March 2019

Corporate News

Steel rope extrusion from Rosendahl

ROSENDAHL has extended its product portfolio with extrusion lines for steel ropes. Before jacketing the ropes, the bundle is opened to apply protective grease or wax. Extrusion technology is not only the line’s core, but Rosendahl’s core business. This is where it does most of its research and development activities. It is not only cables that the company extrudes. It has recently extended its know-how for steel rope extrusion, which, when it comes to the details, is quite different to cable extrusion. Jacketed steel ropes are commonly applied for stay cables or mono-strands. Stay cables are primarily used for cable-stayed bridges. Unbounded mono-strands are used in civil engineering in pre-stressed concrete structures (PT systems). Often, several single cables (mono-strands) are combined to form a bundle (multi-strand), as well. A single strand usually has a diameter of ¼" to 1 1/8 ". Other dimensions are also available. Before jacketing, these strands are coated with a special anti-corrosion material. Rosendahl applies permanent elastic corrosion protection, grease or wax, to those strands. This coating provides protection against corrosion and water penetration and reduces internal friction. The difficult part is to coat the individual steel wires with grease or wax. Specifically for this type of rope preservation, Rosendahl has developed a rope conservation machine, which

▲ ▲ Steel rope extrusion at RosendahlNextrom

is used immediately prior to the application of the PE jacket. The company has introduced an on-line monitoring system for the grease/wax coating application. This ensures high quality and performance control during the entire conservation process. RosendahlNextrom – Austria Website : www.rosendahlnextrom.com

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March 2019