| 摘要 |
<p>A dispensing device is adapted to dispense metered amounts of a liquid substance from a pouch (10) made from a pair of superposed flexible sheets. The pouch defines a liquid containing chamber (15-17) and a narrow liquid discharge passage (18) communicating with the chamber at a junction position (34) and being self-sealing at that position. The device comprises liquid discharge means (23, 27) for applying a pressure to the liquid substance present in the lower part of the chamber (16). The liquid discharge means comprise means (31) for applying an inwardly directed pressure to a pouch wall closely adjacent to the junction position (34) so as to increase the angle (β) defined between the pouch wall and the plane at right angles to the longitudinal axis (13) of the discharge passage (18), whereby the discharge passage (18) may be opened. The dispensing device may also comprise means (35, 43) for bending the discharge passage (18) to an angular configuration so as to close the discharge passage when an amount of liquid has been discharged.</p> |
