Abstract: The invention relates to a material feed device for an extruder. The material feed device has a storage container (4) suspended with provision for free movement on measuring members (3) of a mass throughput weighing device. The outlet (13) of the storage container (4) discharges into an inlet (5) of a feed unit (6) of the extruder. The outlet (13) and the inlet (5) are sealed off on the outside by a seal (16) enabling the storage container (4) to move freely in relation to the inlet (5). The seal comprises a rigid ring bearing via a sealing lip (17) against the outside of the tubular outlet (13) and borne via a sealing lip (18) on a flat sliding surface (15) of the inlet (5). While the sealing lip (17) bearing on the tubular outlet (13) enables the storage container (4) to make a vertical movement, the sealing lip (18) bearing on the flat surface (15) enables the storage container (4) to make a horizontal movement in both axes in relation to the inlet (5).