Noise Barrier Production Line

They are two different sections, so two roller sets are normally used. For the perforated panel the punching unit is integrated into the line.

Yes; hole diameter and open area ratio directly determine sound absorption. We tool and produce the pattern defined in your acoustic design.

Yes. Aluminium requires lower pressure and a different roller surface; the line is set up for the material.

Road traffic noise reducing devices are placed on the market under EN 14388, with EN 1793 covering acoustic performance — sound absorption and airborne sound insulation — and EN 1794 the non-acoustic side such as wind load, stone impact and safety in the event of collision. Almost all of that is tested on the finished device, not on the sheet: the cassette with its perforated face, absorbing core and back panel behaves as a system. What the line is responsible for is producing the metalwork to the design consistently, so that the barrier installed is the one that was tested.

Yes, and it is one of the few things on the panel where a small production drift has an audible result. Absorption depends on hole diameter and open area ratio together with what sits behind the sheet. If open area varies between production runs, the barrier absorbs differently along its length while looking identical. This is why the pattern comes from the acoustic design as a fixed specification and the line reproduces it rather than approximating it.

Because the edges are where the panel is bent and where it carries load. A perforation running into a bend line tears at the holes as the section is formed, and the flange that should hold the panel in its post ends up weakened exactly where it matters. The perforated field is therefore laid out relative to the finished profile, with solid material left at every bend and at the ends. It is a common point of confusion when a panel is being copied from a sample — the visible perforated area is smaller than the sheet.

Aluminium is softer, marks more easily and tends to pick up on roller surfaces, so it runs at lower pressure with different roller surfaces and more attention to lubrication. Steel takes higher pressure and springs back more, which means different roller geometry for the same finished section. Both can run on one line, but they are set up as separate recipes; if you expect to alternate between them regularly, say so at the enquiry stage so the roller sets are planned for it.

No. The roll forming line produces the perforated front profile and the closed back profile. Inserting the mineral wool or other absorbing core, closing the cassette and fitting the end caps is a separate assembly operation with its own equipment. It is worth planning the two together, because the cassette design determines the profile geometry — but they are not the same machine and should be budgeted separately.