Rivset self-pierce riveting is a joining method to create mechanical high-strength joints from similar and dissimilar materials. Joints can consist of two or more layers.
In one step, the semi-tubular rivet punches through the top material layers, forms an interlock in the bottom material layer and also forms the characteristic button. The bottom material layer is not punched through so that a gas- and liquid-tight spot joint is created.
For the production of large motorway and road signs, first aluminium plates are cut to size and braced by means of oblong profiles on the rear. The reflective sheeting produced by use of a modern digital printing method is then bonded to the sign. The individual segments are transported to the motorway where they are joined.
Traffic signs are made from aluminium because it is a lightweight and durable material. The large dimensions of motorway signs, however, quickly result in larger weights. Originally, weld studs were used to be able to join the stiffening profiles on the rear to the aluminium material.
Later, when the composite material Dibond traffic was used, a new generation of traffic signs was born. As the inventor of the original aluminium composite sheet, the 3A Composites Company based in Singen, Germany, makes a contribution with the Dibond traffic. With the composition of two aluminium cover layers and a laminated polyethylene core material, the sheet convinces through its suitability for lightweight construction, weathering resistance and its equivalence with a solid sheet.
