“ EXPERT IN CURVED ROOF AND WALL CLADDING ”

Curved profiled sheets

Our semi-patented bending process is now used in 14 countries and is known as crimp-curving. Dupral is able to bend countless different types of profiled sheets into every imaginable radius.

Bending to angles ranging from 1 to 180 degrees, with a minimum radius of around 250 mm and a maximum sheet length of 13,000 mm (depending on the radius), and the bending of S-curves, present no problem whatsoever. Corrugated sheets (types 17-76 and 18-76) can also be shaped by means of rolling, without the need for crimp-curving.

For new profile sheet designs Dupral is able to produce the necessary crimp-curving in-house.

Curved profiled sheets

SPECIFICATIONS:

Thickness 0.5 – 1.0 mm (in exceptional cases 1.25 mm)
Height max. 106 mm
Radius 250 mm minimum (depending on the profile
Bending angle 1 – 180°
Bend length Radius external x (180° – angle) x 0.01745
Start size Min. 150 mm (to radius 3000 mm)
End size Min. 150 mm (to radius 3000 mm)
Positive – negative wall (concave) or roof (convex)
Minimum length 300 mm
Maximum length 13000 mm (depending of the radius)

Corrugated sheet rolling

By rolling corrugated sheets (types 17-76 and 18-76) they can be curved in such a way that no deformation or buckling occurs.
Maximum thickness 1.0 mm.

SPECIFICATIONS:

Thickness 0.75 – 1.0 mm (in exceptional cases 1.25 mm)
Height max. 18 mm
Radius 3500 mm minimum
Bending angle 1 – 180°
Bend length Radius external x (180° – angle) x 0.01745
Start size 0 mm (excluding straight springing line)
End size 0 mm (excluding straight springing line)
Positive – negative wall (concave) or roof (convex)
Minimum length 500 mm
Maximum length 13000 mm (depending of the radius)

Curved corner sections

Corner sections are produced from crimp-curved profile sheets. A corner section can be produced to any angle, both internal and external.

THE PROCESS:

  • Crimp-curving the profile sheets.
  • Manually sawing the profile sheets to the correct angle.
  • Assembling the parts by means of internal diagonals and blind-rivets.
  • PUR foam applied to the inside corner in order to strengthen.
  • Sealing the outside corner for water tightness.
  • Possible painting of the sealant bead in the colour of the profiled sheet.

Ventilation slots

Our crimp-curving machine also allows ventilation slots to be produced on profile sheets. The ventilation slots can be applied across nearly the entire sheet in order to create the required ventilation for your premises or shed.

SPECIFICATIONS:

Start size (S1) 200,0 mm minimum
End size (S2) 200,0 mm minimum
Sheet thickness     0,7 mm minimum
Spacing   50,0 mm minimum
Slot width   67,0 mm fixed
Slot depth ±  5,0 mm

Do you have questions? Feel free to contact us.

DUPRAL BV