| 摘要 |
An expandable container, formed of a unitary blank of paperboard, including a planar base panel and a plurality of planar fins foldable over the panel to enclose a conical volume. The fins serially overlap and are self-locking in the closed position, and are expandable into the open position by a force exerted from the inside thereof. Such a force can be provided by the popping of corn kernels located therein when the container is heated in a microwave oven. The fins each are trapezoidal in shape, have an interior fold line separating each into a triangular area and a parallelogram shaped area, and are hingedly coupled to the next two adjacent fins.
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