Envelopes – wrappers – and paperboard boxes – Paperboard box – Nonunitary – peelable closure or securing element
Patent
1991-12-17
1993-07-20
Elkins, Gary E.
Envelopes, wrappers, and paperboard boxes
Paperboard box
Nonunitary, peelable closure or securing element
229238, 22912537, B65D 570
Patent
active
052286169
ABSTRACT:
A package container fabricated from plastic-coated packaging material includes an upper end wall and a sealing fin that extends across the upper end wall of the container. The sealing fin includes mutually facing material layers between which is located an opening strip. The opening strip includes an inner layer positioned between outer layers that are sealed to plastic coatings of the packaging material, and an intermediate layer positioned between the inner layer and each of the outer layers. The intermediate layer is fabricated from a material whose properties are such that the adhesive bonding strength between all material layers of the opening strip and between the outer layers of the opening strip and the plastic coating of the packaging material is greater than the internally cohesive bonding strength of the intermediate layer.
REFERENCES:
patent: 3104798 (1963-09-01), Stone
patent: 3713849 (1973-01-01), Grindrod et al.
patent: 3827625 (1974-08-01), Miller
patent: 4433784 (1984-02-01), Kjelgaard
patent: 4762234 (1988-08-01), Wyberg
patent: 4787507 (1988-11-01), Rausing
patent: 4872562 (1989-10-01), Wyberg
patent: 4884695 (1989-12-01), Kjelgaard
patent: 4989736 (1991-02-01), Andersson et al.
Elkins Gary E.
Tetra Alfa Holdings S.A.
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