A pan scale for weighing and ejecting fiber components onto a mixing belt includes an upwardly open container having a plurality of side walls and a bottom formed by a single piece comprising a rotatably hinged bottom flap rotatable from a closing position abutting on one of the side walls into an open position folded away from such side wall, or two pieces comprising rotatably hinged bottom flaps that are rotatable away from one another from an inner closing position abutting against one another into an outer open position. The single bottom flap or at least one of the two bottom flaps includes a retaining device on a bottom surface thereof. Upon opening of the respective bottom flap, a part of the fiber components are retained in the container by the retaining device up to a partial opening angle (β) of the bottom flap.