a process of manufacturing slide frames is disclosed , which are preferably adapted to be elastically expanded and are made from at least one extruded plastic sheet plastic web . plastic web portions are adhesively joined or joined by ultrasonic welding to form a frame and picture gates and punching operations are performed to form picture gates in the frame and to form the external contour of the frame . a film bed which serves to receive a slide and is preferably peripherally closed is formed by embossing .