Additional services

Flat rolling | Nibbling | Punching out | Cutting out |
Bending | Welding | Coating | Galvanizing

1. Flat rolling

All expanded sheets run through a dressing roller after expansion. Moreover, sheets of up to 1000mm width can be flat rolled. This process allows dimension a (sheet depth) to be rolled back to the strand thickness (material thickness).

2. Nibbling

Rau has a modern Trumpf-CNC punch which allows us create any holes and punched-out areas. Uneven edges can also be produced as desired. The dimensions of the CNC punch's baseplate allow it to process sheets up to 1280mm wide and 2070mm deep. The total sheet thickness is limited to 6mm.

3. Punching out

Individual areas can also be punched out using the CNC punch (see above).

4. Cutting out

Our guillotine shears enable us to cut all sheets of up to 4000mm width to the required size. Conical dimensions also possible.

5. Bending

For bending, we employ a bending press which can likewise operate on sheet widths of up to 3200mm. The material thickness is limited to 3.0mm.

6. Welding

To produce ceiling ventilation units, we can upon request weld reinforcing plates and supporting bracket plates on the inside of the bent section.

7. Coating

The coating procedures we employ are powder coating, wet coating and electric oxidation (ELOXAL). For power coating and wet coating, you can choose from all the colours in the RAL range. With ELOXAL, the usual standard colours are available: natural EV1, black C35, nickel silver EV2, light bronze C31 to dark bronze C34, blue and red.

Sizes of more than 4000mm in length can be supplied upon request, however the width is limited by machine capacity to max. 2000mm.

8. Galvanizing

For expanded metal with small mesh, we recommend Sendzimier-galvanized material ST 02 Z, and for larger meshes (profile 3918 and onwards) we recommend hot-dip galvanized sheet steel. Please note that the cut surface is not galvanized in the case of ST 02 Z. Upon request, the sheets can also be zinc-electroplated, however 100% corrosion protection cannot be guaranteed.

In the case of hot-dip galvanized sheets, the surplus zinc from the dip can lead to thickening around the bonds and to undesired zinc tab formation in the mesh openings.