| 摘要 |
<p>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 deg.C to 80 deg.C at the rising ratio of 10 deg.C/min. for 5min. in the base material layer 2 of the cover 1.</p> |
