Abstract: In the sealing method, a flexible lid is adhered onto a ring portion of a flange that delimits a wide opening of the container to be sealed. The flange is tapering upwardly at least before the sealing of the flexible lid, so as to define a slope angle between 5° and 20° to the horizontal at the ring portion. The body of the container includes a side wall and the flange connected to an annular axial end of the side wall, the flange surrounding the opening and being an internal flange protruding radially inward. The ring portion is axially pushed and heated, typically by action of a sealing head. The body is typically in PET and the flange has a radial extension superior to about 2.0 mm and inferior or equal to 5.0 mm.

Abstract: The container has a blow molded piece forming a hollow plastic body. The body has a bottom and an annular side wall longitudinally extending from an annular base to a top. A thin flexible lid of foil material covers and seals a wide top opening of the container. The top is connected to the outer rim of an annular top flange. The top flange protrudes radially inward and delimit the opening at an inner rim. The lid is axially adhered to the flange upper face and can be peeled away, optionally using a pull tab that extends beyond the outer rim. Except at region of the pull tab, the annular outer edge of the lid extends parallel to the outer rim, not beyond 1.0 or 2.0 mm from the outer rim.