Abstract: The invention relates to a method for closing off at least one tunnel (2) extending across the width of a folding curtain, after a strengthening rod (3) has been inserted into this tunnel on the one hand, and a folding curtain comprising at least one tunnel (2) extending across the width of the curtain, which has been provided with a strengthening rod (3) on the other hand. To that effect, a strengthening rod (3) is provided in the tunnel (2) at least one extremity of which is comprising a number of pointed projections (4) and that the tunnel (2) is closed off by pricking the said projections (4) through the wall of the tunnel.

Abstract: The object of the invention is to provide a method and device with which it is possible, in a simple and rapid way, to form a buttonhole in a fabric which requires no further marking. The object of the invention is achieved by providing a method for producing a buttonhole in a fabric, in which an opening is formed in the fabric by means of an ultrasonic welding treatment, after which the edges of this opening are fused, to form the buttonhole.