Abstract: A method of making caps on a continuous production line comprising: causing a first web to travel continuously in a given running direction; laying and securing transversely at substantially regular spaced intervals onto said first-named web, portions of a second web moving parallel to the direction of travel of said first web, each portion of said second web forming a separate element cut from said second web or being integral therewith so as to define rectangular elements adapted to form the crowns of the caps, the fastening of each rectangular element being performed along a line extending transversely of said running direction along a first edge of said rectangular element; forming a flat tube with longitudinal folds from said first web carrying said rectangular elements during or before assembling together the other edges of each one of said rectangular elements, both edges of each said element parallel to said running direction being secured together and the second edge of said element transverse to the