Think about it like this : murders are the raw eggs. Shaping them into day a water bottle changes the chemical structure of the polymers just like a cooked egg is now fundamentally different than a raw egg… the raw egg can go into cookies or cakes or pudding etc etc but the cooked egg can no longer be used for much else…
Once some types of plastic undergoes that melting process, it chemically changes and won’t melt again, but burns instead. Try heating a plastic water bottle (don’t).
You can re-melt other types of plastic, but with our current supply chain setup, it’s cheaper to buy new pellets instead of collecting, transporting, cleaning, sorting, and recycling it. China used to buy a ton, but they’ve toned down recently.
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