1. Deformation remaining from a fold over.
2. Cross direction wrinkles( Washboard): Fold over of a web in the cross machine direction, giving a crease running in the machine direction.
3. Blade crease: A crease essentially in the machine direction devoid of coating in the creased area.
4. Calender Crease: Usually a sharp crease caused by passage through the Calender of a crease or of a fold generated at the Calender; often cut through when it is preferable to call it a Calender out.
5. Smoothed crease: A flattened-out crease running mainly in the machine direction. Can occur at the wet press section, dryer (dryer wrinkles), size press, winder or sheeter.