Patent ID: 7047852

Claim:
A process for providing feedforward control to control a feeding of an elastic material to a target feed rate, comprising the steps of: determining a machine direction distance, L 1 , between a first registration mark and a second registration mark on an elastic material while the elastic material is under a first tension, T 1 ; approximating a machine direction distance, L 0 , between the first registration mark and the second registration mark on the elastic material as if the elastic material were under zero tension, T 0 ; feeding the elastic material at a second tension, T 2 ; measuring a machine direction distance, L 2 , between the first registration mark and the second registration mark on the elastic material while the elastic material is under the second tension, T 2 ; and adjusting a feed rate L s , of the elastic material according to a given relation, to match a predetermined target feed rate.