Closure seal for a container
AssigneeSelig Sealing Products, Inc.
InventorJoseph M. Giles
Life of this patent
Estimating the term…
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.
Claims22
A seal for a container opening, the seal comprising:
- a backing layer;
- a seal layer for connecting to and covering an opening of the container;
- and
- a pull-tab forming layer sandwiched between the backing layer and the seal layer, the pull-tab forming layer having a heat sealable surface joined to the backing layer, an opposite heat resistant surface joined to the seal layer, and a hinge disposed near the center of the seal that joins the backing layer and the seal layer, wherein the backing layer and a portion of the pull-tab forming layer define a pair of opposed pull-tabs extending from the hinge.
A material blank for forming a plurality of seals for covering container openings, the blank comprising:
- a backing layer having an upper and a lower surface;
- a seal layer having an upper and a lower surface;
- and
- a pull-tab forming layer having an upper surface joined to the lower surface of the backing layer and having a lower surface joined to the upper surface of the seal layer, wherein the pull-tab forming layer includes a first sub-layer of a heat sealable material with an exposed upper sub-surface and a lower sub-surface, and with a second sub-layer of a heat resistant material having an exposed lower sub-surface and an upper sub-surface joined to the lower sub-surface of the first sub-layer of material, and wherein the first and second sub-layers are folded to form at least one elongate section, such section generally having an I-shaped cross section with an upper horizontal portion having a top surface that in combination with the upper horizontal portion defines the heat sealable side of the pull-tab forming layer, the top surfaces being formed entirely by exposed sections of the heat sealable sub-layer.
A method of forming a plurality of seals for covering container openings, the method comprising the steps of:
- providing a backing layer having an upper and a lower surface;
- providing a seal layer having an upper and a lower surface;
- joining a lower sub-surface of a first sub-layer of a heat sealable material with an upper sub-surface of a second sub-layer of a heat resistant material;
- folding the joined first and second sub-layers to form at least one elongate section, such section generally having an I-shaped cross section with an upper horizontal portion, a lower horizontal portion, and a vertical hinge portion, wherein the upper horizontal portion defines a heat sealable top surface of a pull-tab forming layer, and wherein the lower horizontal portion defines a heat resistant bottom surface of the pull-tab forming layer;
- securing the backing layer to the pull-tab forming layer by joining the heat sealable top surface of the pull-tab forming layer to the bottom surface of the backing layer;
- adhering the seal layer to the pull-tab forming layer by joining the heat resistant lower surface of the pull-tab forming layer to the upper surface of the seal layer;
- and
- punching a plurality of seal shapes from the adhered layers.
Dependencies are inferred from the claim text.