Terme privilégié :
- trappe n. f.
An opening cut into the cope through which the molten metal is poured into the mold. The closing piece in a stop valve. A valve controlling the admission of water to a waterwheel or conduit. The portion of the runner in a mold through which molten metal enters the mold cavity. Sometimes the generic term is applied to the entire network of connecting channels which conduct metal into the mold cavity. A refractory slab lowered in the forehearth channel for shutting off the flow of glass.