It occured me to ask if these 1,75oz square tobacco tins has an air tight seal on them for what I know the bigger square ones are not whreres those round ones are air vacuum tight.
Square tins and factory vacuum seal
- Thread starter PaulTheScandinavian
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These aren't a perfect seal. Round tins are better, but all of them slowly leak. The leakage is slow enough that they can be good for years, but they're not a perfect seal and eventually the contents will dry out. Put a few tins in a sealed bin, leave them for a few weeks, pop the lid off the bin and take a whiff. You'll be smelling tobacco. That's one reason that I keep all of my Latakia blends separated from the Virginias. You can run a metallic tape seal around the join to improve the seal, or bag them in heat sealed food storage bags. Or you can just jar the stuff.
One thing I would dearly love to hear explained is how they vacuum seal the tins in the first place.
It's one of those things like a radial engine...I just can't get my head around how it works :roll:
Regards,
Jay.
It's one of those things like a radial engine...I just can't get my head around how it works :roll:
Regards,
Jay.
I believe one way to create a small vacuum is to close the tin/jar under heat. When it cools, the air and moisture inside will compact, creating a bit of a vacuum. But for a factory run, I suspect it's pretty cool equipment that creates a vacuum around the whole tin before attaching a lid.
See Russ' post about half way down this thread:
http://pipesmagazine.com/forums/topic/war-horse-tin-seal
Seems they just get closed at ambient pressure then stuck in a vacuum chamber.
http://pipesmagazine.com/forums/topic/war-horse-tin-seal
Seems they just get closed at ambient pressure then stuck in a vacuum chamber.
"When you guys say "radial engine", are you talking about the old-school aero engine,"
Aldecaker, I was indeed referring to the aero engine, the one where the cylinders actually rotate.
Seems hellish too complicated for me to figure out quite how the damned thing works :roll:
Regards,
Jay.
Aldecaker, I was indeed referring to the aero engine, the one where the cylinders actually rotate.
Seems hellish too complicated for me to figure out quite how the damned thing works :roll:
Regards,
Jay.
I've not investigated it, but by the sound of it, it just sounds like they rotate the cylinder around a fixed eccentric. Same result, just a different way of doing it.
As to the tins, I can't say I have ever had a problem with a square tin--- until after I opened it. Once open, they don't seem like they want to seal worth a damn. Probably why I try to avoid them.
As to the tins, I can't say I have ever had a problem with a square tin--- until after I opened it. Once open, they don't seem like they want to seal worth a damn. Probably why I try to avoid them.
The one where the bank of cylinders whirls around a fixed crankshaft is a rotary (such as in the WWI Sopwith Camel). A radial aircraft engine (such as in the B-17), by contrast, has a fixed bank(s) of cylinders, with the crankshaft rotating. A simple way to visualize it is this- one has the prop bolted to the crankcase. The other has the prop bolted to the crankshaft.
They can be a bit goofy to wrap your mind around at first (how do they actuate the valves? Where do they even keep the camshaft? What the shit?), but they are a fascinating powerplant. While not exactly intuitively obvious to the casual observer, they do represent the pinnacle of aviation engineering, IMO. Jets are for kids; radials are where it's at.
They can be a bit goofy to wrap your mind around at first (how do they actuate the valves? Where do they even keep the camshaft? What the shit?), but they are a fascinating powerplant. While not exactly intuitively obvious to the casual observer, they do represent the pinnacle of aviation engineering, IMO. Jets are for kids; radials are where it's at.
The cylinders didn't rotate - there was/is a single-pin crankshaft on which rotates an articulated, radial connecting-rod assembly attached to all the pistons; basically a "master rod" with a split big end, and other rods attached inside its split big end. Hard to describe without images...
just have made an experiment with square tins,this is how I went: I did seal the tins around the joins using a plastic electric tape and ten put these two tins in a cettle with boiling water for bout 50 seconds, and tell you what
bviously these tins got a flatter in their appearence asumably creating this way some more inside vacuum.But seriously this somewhat boyish playing around and was not necessarily perform in any sense, but who knows this measure migth have some advantages too in it,
bviously these tins got a flatter in their appearence asumably creating this way some more inside vacuum.But seriously this somewhat boyish playing around and was not necessarily perform in any sense, but who knows this measure migth have some advantages too in it,
Jitterbugdude: I already did with one, the result was something alike but tidy bit in lesser degree than with square tin ones, now no more experiments on this, otherwise I consider myself being something not adult but oddball''whos has too much speartime
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