| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tetrahedral bottle of which the corner section wall surfaces of the body section are reinforced. SOLUTION: The cross sections of the shoulder section and the body section are formed into square shapes wherein the corner sections are beveled for this tetrahedral bottle. In this case, the body section comprises an upper body section and a lower body section with a lateral indented rib as the boundary. The upper and lower body sections are respectively equipped with four side wall surfaces, and corner section wall surfaces which connect adjacent side wall surfaces. Then, on the corner section wall surfaces, a recess section, which is formed of a bottom surface of a narrow width and a tilted wall, and extends in the vertical direction, is provided. In this case, a central section is provided for the bottom surface. The tilted wall connects the bottom surface and both side edge sections of the corner section wall surfaces.</p> |
