Extruder Length to Diameter Ratio = L/D - The distance from the forward edge of the feed opening to the forward end of the barrel bore divided by the

Extruder Length to Diameter Ratio = L/D - The distance from the forward edge of the feed opening to the forward end of the barrel bore divided by the bore diameter and expressed as a ratio wherein the diameter is reduced by 1, such as 24:1 or 30:1.