Word: thermosetting
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...affluent Chinese peasants. Instead of shipping the tubs from California, you simply ship the VEC unit, or cell. To make the tubs, two composite skins are draped over a foam model, and a thermochemical reaction causes them to harden into shape. (Because no metal bending is involved and the "thermoset" process uses chemistry, not immense heat, the molds cost a fraction of the conventional version.) The skins are then attached to a universal frame. The cell is closed and filled with pressurized water, which braces the skins together. Then composite materials are injected into the mold and catalyzed, causing...
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