Pressure & Press Tonnage
Aluminium
Plastic (Slit Die)
Billet diameter (mm)
Extrusion ratio EX
Alloy series
Soft
Medium
Hard
Safety factor (1.1 – 1.3)
Calculate
Specific pressure
–
Required force F
–
Required press tonnage
–
Recommended press
–
Specific pressure rises with extrusion ratio and alloy strength. Values are sizing estimates.
Plastic die head pressure (slit die)
Apparent melt viscosity η (Pa·s)
Volumetric flow rate Q (mm³/s)
Die land length L (mm)
Die width W (mm)
Die gap height h (mm)
Head pressure drop ΔP
–
ΔP = 12·η·Q·L / (W·h³)
Compare ΔP with the extruder operating limit.