Containers for food service

DETAILED DESCRIPTION OF THE DRAWINGS FIG.
1 is a front view illustrating a container representing one embodiment of the invention; FIG.
2 is a sectional view thereof; FIGS.
3 and 4 are sectional views showing containers in modified forms; FIG.
5 is a graphic representation showing the results of tests conducted on the characteristics of a microwave oven, with experimental containers arranged therein, to prove the advantages of the invention; FIGS.
6 [a] to 6 [d] are plan views showing various ways of arrangement of experimental containers on a turntable in the microwave oven; FIGS.
7 [a] to 7 [h] are plan views showing experimental containers arranged on the turntable according to each particular size of container as assumed; FIGS.
8 [a] to 8 [h] (except 8 [g]) are schematic views in section showing only the raised bottom configurations of the individual assumed containers as taken on lines a--a' .
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h--h' in FIGS.
7 [a] to 7 [h]; and FIG.
9 is a top plan view showing experimental containers arranged with their position shifted off the center of the turntable.
DETAILED DESCRIPTION Referring first to FIGS.
1 and 2, numeral 10 generally designates a container in accordance with this invention, and numeral 11 designates a foamed sheet layer such as foamed polystyrene sheet which constitutes a principal material component of the container.
Shown by 12 is a non-stretched polyethylene terephthalate film or sheet layer laminated on the interior side of the foamed sheet layer 11 or the interior of the container to provide heat resisting capabilities, the former layer being laminated on the latter by thermal adhesion or through the intermediary of a bonding layer (b) comprising a binder.
Numeral 14 is a bottom portion having a configuration of an upwardly arcuate raised bottom pattern as will be described hereinafter, preferably with its center raised most conspicuously.
Designated by 15 is a hollow formed on a portion of the bottom-side circumferential area of the container and along the arcuate raised bottom configuration