| 摘要 |
PURPOSE: A check valve for closing a burlap bag is provided to open/close a hole of the bag with a closing member blowing a flow of gas by using a pressure difference of the gas. CONSTITUTION: A first body unit (100) is joined to an inner side of a burlap bag (10) in which a through-hole (11) is formed and connected to the through-hole. A second body unit is joined to an outer side of the burlap bag and includes a second through-hole (210) connected to the through-hole. A closing member is arranged in an opening/closing space (H) formed between the first and second body units and opens/closes the first through-hole. A flow passage member (400) is arranged between the closing member and the second through-hole and includes a gas passage (P1) connecting the second through-hole and the opening/closing space. A first embossing protrusion (421) is formed on an elastic member in a second through-hole side. A first film member (420) adheres to the elastic member in the second through-hole side. A second film member adheres to the elastic member in a closing member side. |
