Pull-tab sealing member with improved heat distribution for a container
First Claim
1. A pull-tab sealing member, having a top side and a bottom side constructed to be secured to a lip around an opening of a container, to close the container, the pull-tab sealing member comprising:
- a bottom member comprising a metal foil layer having a bottom surface for facing a container, a top surface on the opposite thereof and a non-foam, heat-distributing layer having a top surface, the non-foam, heat-distributing layer disposed over the top surface of the support layer, wherein the support layer includes a lower polymer layer disposed on the bottom surface of the metal foil layer, and wherein the lower polymer layer includes a heat-activated sealant or adhesive coating for securing the bottom member to the container; and
a top member comprising a top surface and bottom surface, and a portion of the top member comprising a tab portion having a top and a bottom surfaces, the bottom surface of the tab portion not secured to the top surface of the non-foam, heat-distributing layer of the bottom member, a portion of the bottom surface of the top member secured to the top surface of the non-foam, heat-distributing layer of the bottom member, whereby the top member is secured to the bottom member in a sufficiently strong manner, so that when the sealant or adhesive coating at the bottom surface of the bottom member is secured to a container, the bottom member can be removed by pulling on the tab portion.
6 Assignments
0 Petitions
Accused Products
Abstract
A seal and method of manufacture is provided for sealing containers such as bottles, jars and the like. The seal (i.e., closure) is formed with a lower sheet-like structure having a non-foam, heat-distributing layer thereon. The lower structure includes a foil support layer and has a polymer layer, such as a PET layer disposed on its bottom surface. A heat-activated sealant layer is provided under the bottom surface of the PET layer to bond the seal to a container opening. The non-foam, heat-distributing layer is preferably a polyolefin film. Seals in accordance with preferred embodiments of the invention also include a top portion, which is only partially bonded (directly or indirectly) to the bottom portion, so as to leave a tab portion extending from the seal. The top portion is advantageously bonded from periphery to periphery of the bottom portion and at or slightly offset from the diameter (middle) of the bottom portion. The top portion is advantageously formed with polymer material, such as an ethylene vinyl acetate (EVA) layer, having a layer of PET bonded on the top thereof. A release strip, which can have a release layer coated on the bottom thereof, is adhered to the top or bottom structures and used to prevent the tab from adhering to the lower structure.
161 Citations
12 Claims
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1. A pull-tab sealing member, having a top side and a bottom side constructed to be secured to a lip around an opening of a container, to close the container, the pull-tab sealing member comprising:
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a bottom member comprising a metal foil layer having a bottom surface for facing a container, a top surface on the opposite thereof and a non-foam, heat-distributing layer having a top surface, the non-foam, heat-distributing layer disposed over the top surface of the support layer, wherein the support layer includes a lower polymer layer disposed on the bottom surface of the metal foil layer, and wherein the lower polymer layer includes a heat-activated sealant or adhesive coating for securing the bottom member to the container; and
a top member comprising a top surface and bottom surface, and a portion of the top member comprising a tab portion having a top and a bottom surfaces, the bottom surface of the tab portion not secured to the top surface of the non-foam, heat-distributing layer of the bottom member, a portion of the bottom surface of the top member secured to the top surface of the non-foam, heat-distributing layer of the bottom member, whereby the top member is secured to the bottom member in a sufficiently strong manner, so that when the sealant or adhesive coating at the bottom surface of the bottom member is secured to a container, the bottom member can be removed by pulling on the tab portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification