7. Glossary

Draw ratio

Ratio of winding speed to average extrusion speed. This dimensionless number, Dr, also represents the reduction in filament cross-sectional area. The square root of the draw ratio therefore represents the reduction in filament diameter.

Viscoelasticity; viscoelasticity

Viscoelastic materials have the property of exhibiting both viscous and elastic behavior. Maxwell's model of this behavior introduces both viscosity and relaxation time.