(57) A gable-top thermoplastic coated container (1) with controllably enhanced sealing
and opening characteristics includes at least one stiffening fillet (56) attached
to the panels (29, 41, 42) which form the spout. The fillet (56) comprises a thin
strip (66) coated with a layer of adhesive (72), and is bonded to at least one of
the pouring spout panels. The strip (66) is resistant to the thermal container-sealing
process, and extends along a major portion of the panel length to increase the force
which may be transmitted to the tip of the spout where the foldback panels (41, 42)
are adjoined, and prevent buckling of the spout panels. An adhesive web is delaminably
bonded with a controlled release adhesive to the opposite surface of the strip, and
is bonded to an opposed panel by the container sealing process. Delamination from
the leakproof or hermetically sealed condition occurs at the interface between the
strip and the delaminable adhesive, and is accomplished with a low opening force.
The strip provides additional stiffness to the spout panels, enabling relatively high
forces to be transferred to the spout tip where the opening forces act to open the
container spout. The spout may be opened readily without significant tearing or delamination
of the spout panels.
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