I dunno, i think drinking pop out of a sphere would be kind of cool, but it would make for more inefficient packing. As far as the divider goes, it could be that it's just a cheap way to manufacture the things too. It's a very simple design that might be easier to stamp out then more elaborate supports.
And I doubt they're too worried about saving plastic. It's not that expensive. I wasn't thinking of a spherical can -- a squatter cylinder would use less material.
As for the plastic, I agree it's cheap; it's the amount of gas they are limiting. The sooner it runs out the sooner you will buy another. Whoops, I should have previewed: a squatter cylinder would use less material than the current shape.
A sphere obviously uses the least material, though it has other problems as you rightly point out. Just a side note from a design engineer who doesn't have a lighter to hand as he doesn't smoke , it's most likely structural integrity and by the way plastic is actually quite expensive per tonne, so it's best to make parts strong through shape and not mass. Agree, it could well be primarily about limiting the amount of gas it takes to make the thing appear full.
But I'm not convinced saving material doesn't count to the designers: Although whatever plastic they use isn't that expensive, neither are disposable lighters. From a web search, at least some of them seem to be made from Derlin acetal polymer.
The same volume of butane would cost maybe 50 cents. That jogs a memory. I read a convincing argument somewhere that soft drink cans and bottles are cylindrical because the contents are under pressure and the round container is best suited to resisting that pressure without deforming.
I'm thinking that the divider could facilitate the lighter's flattened shape by both resisting crushing and by tying together the sides of the body to resist outward pressure from the gas. A spherical container is the best for pressure; strongest shape with the least amount of material. Next best is a round tube with domed ends think of a scuba tank. Flat sides, like in the standard cheap lighter, are the worst. Tie it together with the divider and you have a much stronger container, both to resist pressure and to resist crushing.
So you can get the last bit up into the lighter. You run all the fluid to the side with the tube in it and can use it a lot longer. Uh, guys? Disposable lighters like this run on liquefied GAS. Butane, to be specific. Heck, it works even if you let all fluid flow into second compartment and hold it upside-down. Yes, but that is not how lighters work. Therefore, when the vapor pressure of the gasifying room A is decreased by the use of the lighter, the equilibrium state of gasifying and liquefying is lost, and the liquid gas, which impregnated in the liquid gas containing substance 5 of the liquid gas reservoir B, is gasified and will flow into the gasifying room A through the hole 3 or 3' of the partition wall 2 or 2' or through the small holes of the wire net 7 until an equilibrium state is attained.
The liquid gas used in the present lighter is mainly isobutane gas, and the volumetric expansion of iso-butane CH CH by gasifying will become times of its liquid volume at normal temperature and pressure, while the receiving capacity or" the liquid gas containing substance, for instance, of absorbent cotton, is approximately 7 times or its liquid volume.
It is necessary for a stable flame that the gas pressure kept in the gasifying chamber A and the gas pressure at the fire nozzle will be approximately equal, however, a certain time difference is caused, at the time of use, between the flow out of the gas and the penetration of the gas from the liquid gas containing substance, and consequently some momentary pressure variations of how out gas are inevitable.
According to the experimental results it has been determined, that the length of the flame is practically s,oee, It takes more or less time until an equilibrium state is attained, when the vapor pressure of the gasifying chamber A is decreased by the use of the lighter and the equilibrium state against the liquid gas chamber B is lost and the liquid impregnated in the liquid gas containing substance is gasified and made to flow into the gasifying chamber A, so that care should be taken not to cause such troubles that the flame becomes short or the ignition becomes null, when the lighter is continuously used.
These troubles may be avoided by adjusting the proportion of the volume between the gasifying chamber A and the liquid gas chamber B as well as the way how to keep the liquid gas containing substance 5. According to researches which were conducted, in the embodiment shown in FIG. The lighter shown in the embodiment of FIG. In such a case, ungasified liquid gas is caught by the liquid gas containing substance 5 in the auxiliary gasifying chamber A so that only the gasified liquid gas is made to flow into the gasifying chamber A.
In this case, the density of the liquid gas containing substance e. The lighter shown in the FIG. The density of the liquid gas containing substance in the auxiliary gasifying chamber A is made twice as much as that of in the liquid gas chamber B, so that the reserve quantity of liquid gas is remarkably increased. In the lighter shown in FIG. In this case, it is necessary to fix the covering material to a certain portion of the lighter body and to form a space around the burner 4, corresponding to the gasifying room A.
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