operates with the creaser 400 or 800 causing the distance between creases to vary thus controlling the pitch of the pleats and the phase of the pleats relative to the print pattern after proper phasing relationship is established relative to the adhesive stripe print placement the web is introduced to the creaser 400 or 800 there creases or folds are made in the web in alternating pattern s after the fashions described in fig4 5a upon exiting the creaser 400 or 800 the alternatingly creased web may be passed to the folding machinery 500 600 the first portion of the folding machinery comprises a pair of counter rotating air knives fixed in set apart registry and receptive of the creased web between them the air knife a device well known in several industries comprises a machine capable of emitting a steady intense flow of air along a predetermined path in this instance both air knives emit this intense flow of air in a straight line transverse the web since the knives are spaced one from the other and rotate in opposite directions there is effected between them a shearing wind pattern as the web passes between the rotating air knives its presence forms a barrier and if the rotation and counter rotation of the air knives 500 are properly phased the shearing effect of the radially moving planes of air will.