Flexible and semi-flexible polyurethane foams are used extensively for interior components of automobiles, in seats, headrests, armrests, roof liners, dashboards and instrument panels.
Polyurethanes are used to make automobile seats in a remarkable manner. The seat manufacturer has a mould for each seat model. The mould is a closeable "clamshell" sort of structure that will allow quick casting of the seat cushion, so-called moulded flexible foam, which is then upholstered after removal from the mould.
It is possible to combine these two steps, so-called in-situ, foam-in-fabric or direct moulding. Polyurethane chemicals are injected by a mixing head into the mould cavity.
Then the mould is held at a preset reaction temperature until the chemical mixture has foamed, filled the mould, and formed a stable soft foam.
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