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AssigneeToyo Seikan Kaisha, Ltd.
InventorsKentarou Ichikawa, Nobuhisa Koiso
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This invention provides a plastic container characterized in that an expanded layer comprising expanded cells having a flat shape with an average major axis of not more than 400 μm and an average aspect ratio (L/t) of not less than 6 as viewed in cross section of the container wall along the maximum stretch direction, which are oriented in the stretch direction and are distributed so as to be superimposed on top of each other in the thickness-wise direction, is formed within the container wall. In this container, expanded cells having a flat shape are distributed so as to orient in a given direction and, thus, has light shielding properties and has a pearl-like appearance, that is, has a very high commercial value. Further, since any colorant is not contained, the suitability for recycling is excellent.
A process for producing a foamed preform for forming a container by preparing an unfoamed preform for forming a container of a single-layer structure using a thermoplastic resin imbibing an inert gas, and forming the unfoamed preform by selectively heating part of said unfoamed preform in a manner that a portion corresponding to the mouth of the container and the vicinity thereof are not foamed.
Dependencies are inferred from the claim text.