Two-piece pull-tab sealing member with improved heat distribution for a container
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-007/12
B32B-015/04
출원번호
US-0296016
(2011-11-14)
등록번호
US-8715825
(2014-05-06)
발명자
/ 주소
Thorstensen-Woll, Robert William
출원인 / 주소
Selig Sealing Products, Inc.
대리인 / 주소
Fitch, Even, Tabin & Flannery LLP
인용정보
피인용 횟수 :
2인용 특허 :
70
초록
A two-piece tabbed seal and liner as well as a method of manufacture is provided for sealing containers such as bottles, jars and the like. The two-piece tabbed seal is formed with a lower sheet-like structure having a non-foam, heat-distributing layer thereon.
대표청구항▼
1. A two-piece sealing member having a liner and a pull-tab sealing member, the two-piece sealing member comprising: a liner configured to be retained in a container closure upon opening of a container;a releasable bonding layer on a lower surface of the liner configured to releasably bond the liner
1. A two-piece sealing member having a liner and a pull-tab sealing member, the two-piece sealing member comprising: a liner configured to be retained in a container closure upon opening of a container;a releasable bonding layer on a lower surface of the liner configured to releasably bond the liner to the pull-tab sealing member so that the liner is configured to separate from the pull-tab sealing member when a container closure is removed from a container;a pull-tab sealing member having an upper surface contacting the releasable bonding layer and a lower surface constructed to be secured to a lip surrounding an opening of a container, the pull-tab sealing member including a bottom member and a top member;the bottom member including a non-foam, heat-distributing polyolefin film layer having a first surface and a polymer layer including a heat-activated sealant or adhesive coating for securing the bottom member to the container;the non-foam, heat-distributing polyolefin film layer includes a blend of a first and a second polyolefin component, a density of the second polyolefin component greater than a density of the first polyolefin component, and a density of the non-foam, heat-distributing polyolefin layer from about 0.96 to about 0.99 g/cc; andthe top member including the upper surface of the pull-tab sealing member and a bottom surface, a portion of the top member comprising a tab portion having a top and a bottom surface, the bottom surface of the tab portion not secured to the first surface of the non-foam, heat-distributing polyolefin film layer of the bottom member, and a portion of the bottom surface of the top member secured to the first surface of the non-foam, heat-distributing polyolefin film layer of the bottom member, the top member is secured to the bottom member in a sufficiently strong manner and the non-foam heat distributing polyolefin film layer is of a sufficient thickness so that when the heat-activated sealant or adhesive coating is secured to a container, the bottom member can be removed by pulling on the tab portion without separating the tab portion from the bottom member or rupturing the non-foam heat-distributing polyolefin film layer. 2. The two-piece sealing member of claim 1, wherein the non-foam, heat-distributing polyolefin film layer is selected from the group consisting of polyethylene, polypropylene, ethylene-propylene copolymers and blends thereof. 3. The two-piece sealing member of claim 1, wherein the non-foam, heat-distributing polyolefin film layer is at least about 2.5 mil thick. 4. The two-piece sealing member of claim 1, wherein a release strip is disposed at the bottom surface of the tab portion, positioned to face a portion of the first surface of the non-foam, heat-distributing polyolefin film layer of the bottom member and constructed to help prevent the tab portion from becoming affixed to the bottom member. 5. The two-piece sealing member of claim 4, wherein the release strip comprises PET. 6. The pull-tab sealing member of claim 4, wherein the release strip has a layer of release material disposed on the bottom surface thereof facing the non-foam heat-distributing polyolefin film layer, the release material having less of a characteristic to adhere to the non-foam, heat-distributing polyolefin film layer than the PET layer. 7. The two-piece sealing member of claim 4, wherein there is written matter on the release strip. 8. The two-piece sealing member of claim 1, wherein the top member comprises a layer of PET and a layer of EVA under the PET layer. 9. The two-piece sealing member of claim 1, wherein the non-foam, heat-distributing polyolefin film layer has a density of at least 0.97 g/cm3. 10. The two-piece sealing member of claim 1, wherein the releasable bonding layer is wax. 11. The two-piece sealing member of claim 1, further comprising a foil layer bonded to the heat-activated sealant or adhesive coating. 12. The pull-tab sealing member of claim 1, wherein the density of the non-foam, heat-distributing polyolefin layer is from about 0.97 to about 0.99 g/cc and the non-foam, heat-distributing layer is at least about 2.5 mils thick. 13. A two-piece sealing member having a liner and a pull-tab sealing member, the two-piece sealing member comprising: a liner configured to be retained in a container closure upon opening of a container;a releasable bonding layer on a lower surface of the liner configured to releasably bond the liner to the pull-tab sealing member so that the liner separates from the pull-tab sealing member when a container closure is removed from a container;a pull-tab sealing member having a surface contacting the releasable bonding layer and a surface constructed to be secured to a lip surrounding an opening of a container, the pull-tab sealing member including a bottom member and a top member;the bottom member including a non-foam, heat-distributing polyolefin layer having a top surface and a bottom surface and a polymer layer including a heat-activated sealant or adhesive coating for securing the bottom member to the container;the non-foam, heat-distributing polyolefin layer has a thickness of about 2.5 to about 10 mils and includes a blend of a first and a second polyolefin component, a density of the second polyolefin component greater than a density of the first polyolefin component, where the blend is about 50 to about 70 percent of the second polyolefin component to form a density of the non-form, heat-distributing layer from about 0.96 to about 0.99 g/cm3 so that the non-foam, heat-distributing polyolefin layer is effective to redirect heat towards the polymer layer for securing the heat-activated sealant or adhesive coating to a container; andthe top member including a top surface and bottom surface, a portion of the top member comprising a tab portion having a top and a bottom surface, the bottom surface of the tab portion not secured to the top surface of the non-foam, heat-distributing polyolefin layer of the bottom member, and a portion of the bottom surface of the top member secured to the top surface of the non-foam, heat-distributing polyolefin layer of the bottom member, the top member is secured to the bottom member in a sufficiently strong manner, so that when the heat-activated 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. 14. The pull-tab sealing member of claim 13, wherein the first polyolefin component is a medium density polyethylene and the second polyolefin component is a high density polyethylene. 15. The pull-tab sealing member of claim 13, wherein the density of the non-foam, heat-distributing polyolefin layer is from about 0.97 to about 0.99 g/cc. 16. The pull-tab sealing member of claim 13, wherein the releasable bonding layer is wax. 17. The pull-tab sealing member of claim 13, wherein the liner is selected from the group consisting of pulpboard, cardboard, foam, synthetic fibers, and combinations thereof. 18. The pull-tab sealing member of claim 13, wherein the non-foam, heat-distributing polyolefin film layer is selected from the group consisting of polyethylene, polypropylene, ethylene-propylene copolymers and blends thereof. 19. The pull-tab sealing member of claim 13, further comprising a foil layer bonded to the heat-activated sealant or adhesive coating. 20. The pull-tab sealing member of claim 13, further comprising a polyester support layer providing the top surface of the top member.
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