Patent ID: 8672168

Claim:
Heat-sealable sealing disc for closing a container having a plug or cap closure, the sealing disc comprising: a support to be positioned at the bottom of the plug or of the cap, and a membrane seal comprising at least one reinforcing film and a heat-sealing film for application to a mouth of the container, the membrane seal having a prolongation comprising a pull tab, wherein the whole surface of the pull tab is folded back on a face of the membrane seal in contact with a corresponding face of the support, wherein a portion of the tab in contact with the support after the tab has been folded is devoid of heat-sealing film and the support and the membrane seal are joined by means of a temporary adhesive; and wherein the temporary adhesive comprises a co-extruded film having two faces, and wherein a more adhesive face is applied to a lower surface of the support and a less adhesive face is applied to an upper face of the membrane seal.