| 摘要 |
<p>The cannister is filled with a cellular material e.g. polyethylene, neoprene or polyurethane foam, before being sealed, and has a value for filling the cannister with the fluid contents and a value for respraying the fluid, although these values may be combined into one. The fluid is introduced to the container, via the value, under pressure, but pref. a propellant gas, e.g. Freon 12, in introduced into the container before the fluid.</p> |
