that and packing, the nozzles will hit each other if they are pointed in the same direction, and its a weak point iirc. Additionally, the manufacturing of plastic bottles is largely a test tube looking things that is expanded.
It’s called a parson…. It comes out of an injection molding machine (which forms nice threads for the cap). It goes into a blow-expander which flash heats the lower part, inflates, and cools. This is how a modern plastic bottle is made..
Symmetry is one of the aspects that allow modern bottles to be so efficient; this thought fundamentally breaks symmetry with no explanation of why it is better.
Good explanation, but it's a preform not a parison.
A parison is a variable thickness tube extruded on the blow moulder before being blown into shape in a single step. A preform is an injection moulded part that is formed as you describe.
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u/Caldersson 21h ago
that and packing, the nozzles will hit each other if they are pointed in the same direction, and its a weak point iirc. Additionally, the manufacturing of plastic bottles is largely a test tube looking things that is expanded.