| 摘要 |
PROBLEM TO BE SOLVED: To provide a tank body having an opening part provided with a lid preventing the offensive smell in the tank body from leaking to the outside and capable of preventing the penetration of rainwater. SOLUTION: An outside ring-shaped projection 32 and an inside ring-shaped projection 34 are integrally molded to the edge plate part 26 of a tank body 22 having an opening part 28 on which a lid 38 is mounted in a freely detachable manner formed thereto and a mounting groove 36 in which the ring-shaped protruding part 40 formed to the outer periphery of the lid 38 is inserted is formed between the outside and inside ring-shaped projections 32, 34. This tank body 22 is constituted of a reactive injection molded object of a norbornene monomer. |
