PURPOSE: To automatically seal a vessel by a half-opened cover of the vessel because the cover is heated by the steam of hot water supplied to the vessel.
CONSTITUTION: A cover 1 of a vessel is made of a laminated sheet 6 composed of a base material layer 2, an adhesive layer 3, a metallic layer 4, and a heat- sealing resin layer 5, for sealing the vessel. The direction to which the cover 1 is peeled off from the vessel when the cover 1 is stuck with heat-melting via the heat-sealing resin layer 6, is instructed on the cover surface by a printed mark. The base material layer 2 is formed by either extensible resin mono-layer film 2a having a number of fine voids 8 in the inside or a laminated sheet 6 of extensible resin film 2a having a number of fine voilds 8 in the inside. The peeling-off direction by the printed mark is provided so as to correspond to the direction of the larger thermal expansion rate, when the cover is heated from 30°C to 80°C at the rising ratio of 10°C/min. for 5min. in the base material layer 2 of the cover 1.
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