Method for forming objects from a hardenable material in a mould in particular objects provided with ribs, such as open grids or grids closed on one side; as well as moulds adapted to be applied with this method.

摘要

The mould is provided with a deformable lining (5), which is fixed to the mould at least along its edge. This flexible lining (5) can be brought into two positions, i.e. into a first position, in which the mould is in a discharging or a filling position, and into a second position, in which the mould occupies a hardening position. In this hardening position of the mould the interior of the lining (5), which defines the mould cavity, corresponds with the external shape of the object to be formed, whilst in the discharging or the filling position of the mould both the internal space of the lining and its upper discharge or filling opening are considerably larger. In the discharging or the filling position of the mould a subatmospheric pressure is exerted on the lower side of the lining (5), while in order to bring the mould into the hardening position this subatmospheric pressure is released and a support core system (2) accommodated in the mould is at least partially displaced upwardly.