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The Draw Down Ratio is the ratio between the area between the die opening and the external diameter of the tip.
Example:
Tube with an Outer Diameter (OD) of 5.0 mm, and an Inner Diameter (ID) of 4.0 mm, that is a wall thickness of 0.5 mm.
Tooling: Tip external diameter (Tod) of 5.0 mm. Die diameter (Dd) of 7.0 mm
Equation: DDR = (Dd2 - Tod2)/(OD2 - ID2) = (49 - 25)/(25 - 16) = 2.67
The DDR, basically gives you an idea of how much you can stretch the material. Different Polymers have different limits as to how high a DDR can be.
NOTE: DDR should not be confused with DRB (Draw Ratio Balance) which is a measure of how "tight" you will get a coating, say while coating a cable.
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