![]() As the way milk was bought changed over time, the delivery method adapted to the packaging rather than the other way around. Milk was traditionally put into rectangular bottles, probably expressly for the reason that they would fit neatly into a milk crate that could be carried around by the milk man. I'm sure a lot of it has to do with history and tradition. A 2-liter bottle preform for carbonated soda is about 6 inches long. They're typically smaller than a soda bottle preform as their walls can be thinner. *Edit: Also, the pic you posted is, I'm pretty sure, of a 16 or 20-oz water bottle. Source: I worked for Western Container, producing bottles for Coca-Cola and Dr. Bottles are almost never made simply to fill inventory - instead, they are to fill constant demand. ![]() These machines run nearly all day long, stopping operation only for mold changes and regular maintenance. The time it takes to complete a bottle is determined by its size (smaller bottles go faster).Ī single typical blow-mold machine will turn out about 12 20-oz bottles per second, or close to 40,000 per hour. The blow-molds themselves are arranged in a circular pattern around a rotating hub so that, as one preform is getting molded, another is entering the process behind it. The mold is then removed, and the rapidly cooling bottle goes down the line to be palletized and stored for later delivery. The preform (the test-tube looking model you linked) is run into the blow-mold machine, where two halves of the mold clamp down around it clam-shell fashion, and a third piece that makes the "feet" of the bottle is locked into place.Īn industrial-sized needle is run down into the mouth of the preform, blasting a very hot, high pressure jet of air into the preform which forces it to soften and expand into the confines of the mold. I'm not sure about other bottlers, but Coca-Cola makes the bottles first, and then sends them to a separate bottling facility for filling. Source: Working in a lab trying to make conical particles from spheres and Chemical Engineering thermodynamics. This minimization of surface energy is an explanation for why certain compounds (like oil and water) do not mix. ![]() Given enough time, oil and water will try to separate from each other (as their contact has high energy and they each seek to minimize their surface energy) and form two layers, which has the smallest amount of contact per volume for a bulk system (the oil/water boundary). Particles seek to have the lowest energy possible (as the lowest energy makes the particles the most stable) and one way to do it is to minimize the area of contact.įor the oil/water example, the water particles inside oil will take a spherical shape because that gives the most volume/surface area (as you have mentioned). When two particles that don't dissolve well into each other (say water/oil) are in contact, that area of contact has a surface energy. I guess that translates to energy savings? I know it has the smallest surface area/perimeter to volume/area.
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