Patent ID: 6773641
Filing Date: 2004-08-10
Classification: B28B,B29C

Abstract:
Method of producing slabs made of granulated stone materials and/or sand bound with a hardenable resin, of the type in which a mixture of granulated stone material and/or sand and hardenable resin is spread on a support so as to form a layer of substantially uniform thickness, the support being protected by a sheet material interposed between the upper surface of the support and the layer of mixture, the support is transferred to a station for vibratory compaction under vacuum, care being taken to protect the upper surface of the layer of mixture with a sheet material superimposed on the layer before it reaches the station and, after the vibratory compaction under vacuum, the support with the layer of compacted mixture is transferred to a hardening stations, the said sheet material also being highly resilient, characterized in that the flat configuration of the lower sheet is replaced by a shaped configuration comprising a flat base and a peripheral frame projecting from the said flat base for a predetermine height so as to define a seat of dimensions corresponding in plan to those of the slab to be produced, the aforementioned peripheral frame having a height which is lower by a predetermined amount than that of the final slab to be produced so that, after compaction, a space of predetermined depth remains between the peripheral edge of the upper sheet and the top of the aforementioned frame.