They use a thin plastic liner to prevent reaction with the Aluminum. These will burn off when the Al is melted for recycling. Great video here: [this video]
Most metal food containers are coated with plastics like BPA. You can't trust "BPA free" labels because there are now analog compounds in use. For example this is what a dissolved coke can looks like.[1] 1. [this video]
The (possible) patent has some good details ( [link] ) > The ink storage pipe includes an at least two-layer structure of an inner layer in contact with ink and a base layer, the base layer being formed of a paper base material and the inner layer being formed of a resin. The resin is preferably an acrylic resin, polystyrene, a fluorine resin, silicone or a mixture thereof. > In case of applying a resin film, the inner layer 4 has a thickness of typically 3 to 90 micrometre and preferably 5 to 60 micrometre. This honestly seems like the coke cans ( [this video] ). In any case, this should be easier to recycle than the cans.
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