B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
206/20
B65D 53/04 (2006.01) B32B 1/00 (2006.01) B32B 7/02 (2006.01) B32B 7/10 (2006.01) B32B 15/08 (2006.01) B32B 27/08 (2006.01)
Patent
CA 2015992
ABSTRACT OF THE DISCLOSURE This invention relates to containers, and, in particular, to multi-layer sheet materials for sealing containers. A problem encountered with tabbed innerseals currently used in the marketplace is known as springback. In most conventional tabbed innerseals, after the tab is folded to allow insertion of the innerseal in the cap, the tab springs back about 90° so that rather than laying flat against the portion of the innerseal covering the mouth of the container, it extends roughly perpendicular to the plane of the innereal. After the innerseal is inserted into the cap, springback of the tab can push the innerseal out of the cap and cause it to be misaligned during sealing so that an inadequate seal is formed. Springback of the tab can also cause the innerseal to fall out of the cap, resulting in an unsealed container. This invention provides a reinforced sheet material suitable for making innerseals and sealing membranes for containers. The sheet material comprises a layer of sealing material for bonding the sheet to a container, a layer of material substantially impermeable to air and moisture, and a reinforcing layer comprising at least two plies of monoaxially oriented film combined in lamination with the strong direction of at least one ply crossing the weak direction of another ply. Tabbed innerseals made from the sheet material of this invention exhibit less springback than do tabs of conventional tabbed innerseals. The invention also includes innerseals and sealing membranes made from the aforementioned sheet material and containers utilizing these innerseals and sealing membranes.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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