| 摘要 |
PROBLEM TO BE SOLVED: To completely produce a cap body in one injection molding process, by providing a surge-preventive element having a gas-permeable material to eliminate the surge pressure in a container inside acting on a film and integrally forming the film of a pressure-compensation device together with the cap. SOLUTION: The cap 1 of a container which can be filled with a granular solid or a liquid, is provided with a pressure-compensation device made of a film 7 and a surge-protective element. The cap is provided with wall 2, cover 3, lower side edge 4, and inside screw 5 torsionally fitted, as a torsionally attached cap. And hence, the cap 1 can be fitted to the corresponding opening of the container with an outer screw, by twisting it. The cap 1 is designed as plastic parts by the injection molding and the film 7 of the pressure- compensation device is injection-molded to the upper side of the cover 3, in the injection molding process. |
