I thought of that and forgot to add it to any of my posts... If you can get
a small tube to match to a hole somewhere in the case, get the gas in
through that to displace the air, because if you use a food pack sealer
you'll otherwise trap a higher proportion of air than clean nitrogen when
the bag contratcs round the case.
It might be harder to handle that method anyway, and a loose wrap is
better for maintaining atmosperic pressure. I'd just use decent clear
polythene bags (ideal material, used in ultra stable capacitor dielectrics,
as it happens). I'd bunch the open end round the gas tube with the computer
inside, with a rubber band to keep the bag neck closed, and have another
short bit of tube in the neck to let air out. I'd navigate the main tube
end so it flushed the computer through a case hole, and run it for a couple
of minutes, lightly squeezing the bag like a bagpipe to make the gas
flush more efficient. This way it won't matter if the gas expands enough to
cool below ambient heat and cause condensation, it will settle on the
outside of the bag, not the inside.
Then I'd pull both tubes out quickly
so the rubber band tightened to part-seal the bag. I'd bunch the open end
and twist it tight, then use a cigaretter lighter or candle to melt the end
like I was sealing a nylon rope end. No fumes will get into the machine,
the few that could get down the twisted polythene would be stopped by the
rubber band. Then I'd pack it loosely into a cardboard box after gently
squeezing for a few tens of seconds to make sure that it wasn't deflating
though a leak.
Seriously, sometimes a well-thought crude method wil get you far better
results. By the time you'd got your gas-filled package ready for that food
sealer, you'd maybe have lost half your bagged nitrogen through a big open
gap and replaced it with air. A bit of dexterity will do more than a
machine will do, and at far less cost.
Btw, what kind of cost are these machines? I saw a few pages online, but
few that mention money.
