| 摘要 |
A package (1) in the form of a spray container in which slides a piston. There is a dispensing nozzle at one end of the container and a liquid to be dispensed between the piston and the nozzle. A compressed gas occupies the container on the other side of the piston. The seal between the piston and the internal side wall of the container is ensured by shallow annular grooves in the internal side wall, having an interval less than 1,000 mu m and a depth no greater than 100 mu m.
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