Moisture-resistant dispensing top

Claim 1

a dispensing cap for a container comprising an injection-molded one-piece body, the body having a generally circular end wall and a generally cylindrical skirt, an aperture in the end wall of a size sufficient to allow spooning out granular product from the container through the aperture, a generally planar flap closing the aperture, the flap being hinged on the end wall along a line generally parallel to a diametral line across the end wall between an open position clear of the aperture and a closed position over the aperture, the flap lying in a plane substantially parallel to the end wall when its closed position over the aperture; major areas of the skirt, end wall and flap each having a nominal wall thickness, a sealing flash extending around the aperture, the sealing flash having a thickness that is a minor fraction of the nominal wall thickness of any of the skirt, end wall and flap and a free length sufficient in comparison to its thickness to enable it to bend, the sealing flash having an interference fit between the end wall and the flap when the flap is in the closed position and being arranged to elastically deform in local bending deflection to accommodate closing of the flap and produce a resilient seal between the end wall and the flap.