ES269233A1 - A procedure for closing containers with protective seal (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A method for closing containers with a protective seal, characterized by a first phase, of punching a metallic ring in the form of a crown with a reed in half a reed. At the central edge of the ring a downwardly directed flange is formed which has a concave annular groove of horizontal plane on its inner surface. The surface of the flange is substantially frustoconical, ending with a sharp edge at its minor base. On the external surface of the flange there is the convex molding corresponding to the inner groove. In a second phase and through the lower face of the central circular flange of the lid an extremely thin metallic circular sheet is applied which forms a surrounding cup of the outer surface of the central flange, thereby closing the hole of the ring. The cylindrical surface of the bowl applied by pressure by means of rollers or dies, adapts to the surface with external molding of the flange. In a third phase, the circular ring and thin lid assembly is fixed to the edge of the container, by folding the perimetral flat flange of the circular ring obtained in the first phase, so that the container is formed with the thin lid acting as seal and that can not be removed without breakage. Finally, in a fourth phase, a circular lid punched in the upper recess of the circular ring is fitted with the thin lid introduced by its lower face. The circular die-cut cap affects the shape of a slightly conical lateral wall capsule, which covers the thin central sheet that acts as a seal. (Machine-translation by Google Translate, not legally binding)