a method for fabricating a funnel , a tool for carrying out the method , and a funnel of flat material , more particularly of plastic - coated paper . a receptacle for a pulverulent and / or liquid medium includes a funnel disposed in a pouring or discharging region . a blank of flat material is shaped to a funnel - shaped sleeve having an outlet opening , an inlet opening , and an opening angle , and the funnel - shaped sleeve is swaged in at least one subregion to effect enlargement of the opening angle .