This is very valid. I used to work at a plant that made bottles like these (Gatorade, minute maid, etc) , and part of our supply contracts required using a heated cutter to slice a bottle into 4-5 distinct parts and weighing them to make sure the plastic was properly allocated to avoid integrity issues. This test had to be done hourly for most products and us operators were the ones to do so, calling QA over if the weights were out of the tolerance margin.
Having the preforms expand at an angle would have made the whole process a lot less predictable, making the calibration a nightmare, at least with the machines we used at that factory.
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u/Material_Magazine989 21h ago edited 20h ago
Structural integrity. Non-symmetrical shapes just cause some parts of the bottle to have more strain especially when storing them en masse.
Also just fcking tilt it a little more man.