| 摘要 |
A dispenser closure suitable for bag-in-box packaging comprises a valve body (11) formed with a downwardly directed opening (21) defining a valve seat (22). A valve member (24) is biased to seal against the seat (22) by a diaphragmatic wall (25), however lifting of tab (28) allows opening of the valve. The valve member (24) is tubular with a recessed end wall (27). The valve sealing surfaces of seat (22) and valve member (24) may be conically convergent or of modified shape for dispensing viscous liquids. The external face of the valve seat and the internal face of the tubular valve member (24) converge down to a thin lower edge to prevent external drops of dispensed liquid remaining at the outlet to contaminate subsequent discharges. |
