method disclosed in u s pat no 5 160 563 to kutchmarek et al the disclosure of which is hereby incorporated by reference herein that patent discloses a process for manufacturing a double cell or a multi cell product for window coverings i e a product having cells partially or completely displaced horizontally from one another the present invention is addressed to a single cell product i e a product in which all cells are aligned vertically to manufacture an expandable and collapsible product that may be used as a window covering according to one method of the present invention a continuous web of material 100 is first provided the width of the continuous material may be the width of a single window covering or may be large enough to cut several window coverings side by side from a single web in a preferred embodiment a nominal web width of eight feet or ten feet is used non woven polyester fabric is the preferred material however any fabric film or other web material that can be permanently creased may be used the web may for example be formed of suitable plastic film such as polyester film or from woven or non woven material formed from various fibers including natural and synthetic such as polyester that retains a crease when folded in the presence of heat where desired web 100 may be printed or dyed in order to impart a color a design or both to the finished window covering in such an embodiment stripes 101 running the width of the web may be printed on.