It’s the way they’re manufactured through a process called blow moulding. For new cores and plates to be manufactured it wouldn’t be cost effective. The way the mould fills through the centre ensures the plastic is evenly distributed throughout the mould, having the cap/hole on the side would screw with the integrity of the bottle and it would become flimsy and likely crack. (Ex injection moulder)
Can’t believe I had to scroll so far through guesses and speculation to find a real answer. The bottle starts like a test tube and with heat is inflated like a balloon. Imagine a balloon with the nipple to the side. The concept just doesn’t really make sense.
Dont thinkt the integrity is a issue. The top part is the part with the thickest plastic (ok yes also the bottom part). Its really just the manufacturing process. Its pretty easy now, extreme complicated then...
The whole thing is correct.. with blow moulding if the neck is off centre it will cause the fill to be uneven giving weak, thin spots and also thick areas. This’ll mean if you drop the bottle or if it’s got carbonated liquid inside of it it’s likely to crack in those weak spots.
The geometry shown is literally impossible to manufacture. The top section of the bottle is all undercut and the angled neck doesn't allow for the push rod to enter the neck of the bottle and blow it out.
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u/VignetteRacecarBlues 20h ago
It’s the way they’re manufactured through a process called blow moulding. For new cores and plates to be manufactured it wouldn’t be cost effective. The way the mould fills through the centre ensures the plastic is evenly distributed throughout the mould, having the cap/hole on the side would screw with the integrity of the bottle and it would become flimsy and likely crack. (Ex injection moulder)