| 摘要 |
PURPOSE: To easily release pressure without separately requiring a tool by providing a hole and a freely detachable seal. CONSTITUTION: A thin film 10 comprising a resinous material having the same thermoplastic characteristics as those of the resinous material forming a seal 5 is deposited on the edge part and cut edge part of a hole 6. This thin film is fused to the varnish film 7 lining the rear surface of a closure panel 1. Therefore, a seal is formed to the lower part of the hole 6. At the same time, the contact possibility of the cut edge part 9 of the hole and the interior part or lower part of the metal closure panel 1 is eliminated and, therefore, the contact possibility of a product with an acid substance can be eliminated at the part 9 of the hole not protected by sanitary varnish. The outflow of the resinous material deposited on a recessed part 4 in a liquid or molten state and forming the seal 5 in the hole 6 is prevented but, since the this film 10 is preliminarily deposited on the lower part of the hole 6, a rim 9 can be perfectly protected by the thin film 10. |
