| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the strength of an opening part, to heighten the sealability, to reduce the manufacturing cost, and to reduce the volume of the refuse by continuously or discontinuously forming m thick wall part which is thicker than a body part over a whole periphery of an area from an upper end face at the opening part to a specified depth. SOLUTION: A thick wall part 6 which is thicker than a body part 3 or a bottom part 4 is continuously formed over the whole periphery of an opening part 2 in an area from an upper end face 5 of the opening part 2 to a specified depth(d). The thick wall part 6 is expanded inward of a molded body 1 so that the mechanical strength of the opening part 2 can be sufficiently ensured in applications and shapes of the molded body. The overhang (x) in the horizontal direction from an inner wall of a part having no thick wall part 6 is 0.5 to 5.0 mm. By providing the thick wall part 6, a tab for sticking in sealing the upper end face 5 of the opening part 2 by a sealing paper or the like can be increased, and the adhesive strength of the upper end face 5 to the sealing paper or the like can be increased thereby.</p> |
