Composite container with membrane and bead closure system

Details Composite container with membrane and bead closure system Composite container with membrane and bead closure system

2005-02-22

2005-02-22

Elkins, Gary E. (Department: 3727)

Envelopes, wrappers, and paperboard boxes

Paperboard box

Nonunitary, peelable closure or securing element

C220S359300, C220S359400, C229S123200

Reexamination Certificate

active

06857561

ABSTRACT:
A composite container of paperboard has a polymeric film barrier layer on the inner surface thereof. A rolled bead is formed at a top end of the container and a membrane closure is bonded to the bead by a first heat seal material on the bead and a second heat seal material on the membrane. The heat seal materials preferably comprise ethylene acid copolymer such as methacrylic acid or acrylic acid, partially neutralized with zinc or sodium ions. A primer layer is disposed between the heat seal material on the bead and the polymer barrier layer of the container. The primer provides a high z-direction bond strength but is designed to fail in a shear tearing mode when peeling the membrane from the bead, such that the heat seal material on the bead is detached from the bead and remains attached to the membrane. The primer prevents tearing of the polymer barrier layer of the container.

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European Search Report for European Application No. EP 04251918.1, Filed Mar. 31, 2004, Date of Completion Aug. 18, 2004.

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