| 摘要 |
A container top closure integrally formed from plastic polymer material as by injection molding. The closure is adapted to be attached to the upper end of a container for granular or other pourable material. A single plastic member, such as polypropylene, or polyethylene, is provided with a dispensing opening, the opening having an integral skirt downwardly depending from three sides of its periphery, to define a first dispensing opening surface. A closure flap, integrally formed with the member which defines the top closure, carries two sealing surfaces which cooperate with complementary surfaces formed around the dispensing opening. The sealing surfaces provide increased moisture entrance resistance across the dispensing opening. |
