Abstract: A seal for a container opening includes a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is bonded to the seal layer. The pull-tab forming layer has a heat resistant surface joined to the seal layer, and a hinge disposed near the center of the seal. A portion of the pull-tab forming layer defines a pair of opposed pull-tabs extending from the hinge, in which the heat resistant surface covers a top surface of each of the pull-tabs, a surface of the pull-tabs opposite the top surface, and a portion of the pull-tab forming layer facing the surface of the pull-tabs opposite the top surface. A method of forming the seal and a material blank for forming a plurality of the seals are also described.

Abstract: A seal for a container opening includes a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is bonded to the seal layer. The pull-tab forming layer has a heat resistant surface joined to the seal layer, and a hinge disposed near the center of the seal. A portion of the pull-tab forming layer defines a pair of opposed pull-tabs extending from the hinge, in which the heat resistant surface covers a top surface of each of the pull-tabs, a surface of the pull-tabs opposite the top surface, and a portion of the pull-tab forming layer facing the surface of the pull-tabs opposite the top surface. A method of forming the seal and a material blank for forming a plurality of the seals are also described.

Abstract: A seal for a container opening includes a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is bonded to the seal layer. The pull-tab forming layer has a heat resistant surface joined to the seal layer, and a hinge disposed near the center of the seal. A portion of the pull-tab forming layer defines a pair of opposed pull-tabs extending from the hinge, in which the heat resistant surface covers a top surface of each of the pull-tabs, a surface of the pull-tabs opposite the top surface, and a portion of the pull-tab forming layer facing the surface of the pull-tabs opposite the top surface. A method of forming the seal and a material blank for forming a plurality of the seals are also described.

Abstract: A seal for a container opening includes a backing layer and a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is sandwiched between the backing layer and the seal layer. The pull-tab forming layer has a heat sealable surface joined to the backing layer. An opposite heat resistant surface is joined to the seal layer. A hinge is disposed near the center of the seal that joins the backing layer and the sealed layer wherein the backing layer and at least a portion of the pull-tab forming layer define a pair of pull-tabs extending from the hinge. A method of forming the seal including the pull-tab forming layer and a material blank for forming a plurality of the seals are also described.

Abstract: A seal for a container opening includes a backing layer and a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is sandwiched between the backing layer and the seal layer. The pull-tab forming layer has a heat sealable surface joined to the backing layer. An opposite heat resistant surface is joined to the seal layer. A hinge is disposed near the center of the seal that joins the backing layer and the sealed layer wherein the backing layer and at least a portion of the pull-tab forming layer define a pair of pull-tabs extending from the hinge. A method of forming the seal including the pull-tab forming layer and a material blank for forming a plurality of the seals are also described.

Abstract: A seal for a container opening includes a backing layer and a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is sandwiched between the backing layer and the seal layer. The pull-tab forming layer has a heat sealable surface joined to the backing layer. An opposite heat resistant surface is joined to the seal layer. A hinge is disposed near the center of the seal that joins the backing layer and the sealed layer wherein the backing layer and at least a portion of the pull-tab forming layer define a pair of pull-tabs extending from the hinge. A method of forming the seal including the pull-tab forming layer and a material blank for forming a plurality of the seals are also described.

Abstract: An innerseal is provided for sealing against the lip of a container opening under a cap. The innerseal includes a resiliently-compressible porous synthetic backing layer which fits within the cap, a foil layer, and a wax layer which initially holds the foil and backing layers together. Preferably, a heat-activatable adhesive layer is disposed against the foil layer. The cap is tightened so that the foil layer is pressed against the lip of the container opening. Then, heat is applied to melt the wax and to activate the adhesive layer. This molten wax is absorbed into the synthetic backing layer so that the backing layer and foil layer are separatable by a twisting of the cap. The synthetic backing layer provides improved strength and liquid resistance characteristics over pulpboard type seals, and is cuttable with less dust.

Abstract: A seal for a container is provided with a method of manufacturing the same. The seal has a unitary pull-tab portion having with a pull-tab formed therein. A layer of polyester film preferably is secured to the unitary member over the pull-tab. A foil seal portion preferably is secured to the pull-tab portion and constructed for securing around the opening of the container. The pull-tab portion preferably is formed of a first layer of a plastic material fused to a second layer of the plastic material by extruding the one onto the other with a release layer therebetween such that an unfused portion of the first layer forms the pull-tab.

Abstract: A tamper indicating seal is formed by a first laminate portion, including a layer of aluminum foil and a layer of a heat activated adhesive and a second laminate portion including a layer of heat resistant plastic film or foam and a layer of polyester film. The two laminate portions are secured together by an adhesive layer having two sections: a pattern section and a solid layer section. The solid layer section extends only to about 20% of the diameter of the seal and permanently secures the two laminate sections together. The pattern section covers the remaining portion and only lightly secures the two laminate sections together. The second laminate section can be easily removed from the pattern adhesive to form a pull tab to remove the seal from a container.