Basics of Web Tension Control SummaryBrake TQ = T R× T= TQ R Hold back to create tension 1 = Nip roll velocity E = Elasticity of the material A = Cross sectional area of the material The larger the elasticity E the less likely the material is to stretch For most values of EA use TORQUE CONTROL For stretchy material where E is small speed control can approach being as good as torque control Speed Control Case R T 1