Abstract: A core is provided with a coating formed by an agglomerate obtained by hardening of a mixture comprising a granulated stone material, preferably of the type having a high hardness factor and light color, and a hardening resin, preferably an epoxy resin, for manufacturing a roller or cylinder of a non-porous external surface, the roller being used for the processing of materials and products. For the manufacture of the roller, a formwork having a cavity for housing a core is prepared so as to provide an interspace which is filled with the mixture, following which compacting of the mixture present in the interspace and then the resin hardening step are performed to obtain a non-porous agglomerate.

Abstract: An apparatus for machining an article (L) in the form of a slab or the like comprises—in addition to a rotary tool (24) associated with a spindle (22)—a nozzle (26) ejecting water at very high pressure. Both the rotary tool and the nozzle are supported by a carriage (20) sliding along a beam (18) in turn sliding along two shoulders (14) in a perpendicular direction. In the working area (12) and above a tank (30) normally filled with water, the article (L) is supported in a horizontal position not only by an interchangeable grid (32; 52), but preferably also by a disposable support (34) which prevent the rotary tool (24) from coming into contact with the grid. The disposable support is periodically replaced.

Abstract: A loose mixture formed of one or more solid inert materials and a hardenable resin dissolved in an organic solvent, in particular the remainder of the initial mix used for the manufacture of conglomerate stone sheets, is rendered inert by means of dielectric heating at a frequency of less than 300 MHz. The invention also relates to the plant for implementing this method.

Abstract: In the manufacture of slabs and panels of ceramic material according to the vacuum vibrocompaction method described in Italian patent 1,311,858, the initial mix is formed using ceramic having the form of sands having a grain size of less than 2.5 mm, preferably less than 1 mm, and ceramic powders, together with a binding additive in the form of an aqueous solution consisting of sodium silicate in a concentration greater than 24° Baumé, fibers of high-melting transparent inorganic material, preferably high-melting glass, also being added to the mix. The slabs obtained have an improved mechanical strength, a reduced porosity and improved aesthetic properties, in addition to being free from cracks and microscopic fissures.

Abstract: Mixing machine of the type comprising a container (10), inside which aggregates and binding fluids are introduced in order to form stone mixes, and at least one motor-driven mixing unit (30; 130A, 130B), the axis (Y; Y1, Y2) of which is parallel to and at a distance from the central axis (X) of the container (10). In order to introduce the binding fluids into the container (10), the machine comprises a dispensing unit (50; 150) which rotates in synchronism with the mixing unit (30; 130A, 130B), remaining always angularly at a distance therefrom.

Abstract: In a plant for manufacturing conglomerate sheets comprising a first station (24) for filling moulds (22) with mix formed by a stone material and a binder, a second vacuum vibrocompression station and a third station for hardening of the rough-formed sheet, a carriage (38) provided with gripping means (40, 41), in particular gripper jaw means, is mounted on a fixed supporting and sliding surface (36) situated downstream of the second station and coplanar with the base (30) of the vibrocompression machine (32). The carriage (38) is movable between a position where it inserts each mould into the second station and, after vibrocompression, prepares it for subsequent transfer to the hardening station.

Abstract: Mixing machine of the type comprising a container (10), inside which aggregates and binding fluids are introduced in order to form stone mixes, and at least one motor-driven mixing unit (30; 130A, 130B), the axis %; Y1, Y2) of which is parallel to and at a distance from the central axis (of the container (10). In order to introduce the binding fluids into the container (10), the machine comprises a dispensing unit (50; 150) which rotates in synchronism with the mixing unit (30; 130A, 130B), remaining always angularly at a distance therefrom.

Abstract: A lapping head (10) for machining a workpiece of hard stone materials comprises a body (12) rotatable about a vertical axis (Y) and having tools (20a,b,c,d,e,f) mounted thereon in such a way that each tool can swing about an axis arranged radially with respect to said vertical axis (Y). The tools (20a,b,c,d,e,f) are subdivided into at least two groups of tools (20a,c,e and 20b,d,f) positioned at different distances from the vertical axis (Y). In each group the tools are equidistant from the vertical axis (Y) and arranged in a circumferentially equidistant manner.

Abstract: Method for producing articles which are not flat from a mix consisting of granulated inorganic materials and a hardening resin. After being compacted by means of vacuum vibrocompression on a flat forming support, the mix is transferred onto a form (300), the surface (350) of which has the same curvature as the article (100) to be obtained, and is left there until hardening of the mix is achieved. The articles made using this method and able to be used in various industrial and civil applications are also claimed.

Abstract: A machine for processing, in particular for cutting workpieces in the form of slabs, comprises a spindle (36) slidably supported by a beam (32) displaceable transversely with respect to the longitudinal direction of a working surface (12). The beam is in turn slidably supported at its ends by two bridge structures (22, 24) situated at the two ends of said working surface. The spindle (36) is rotatably adjustable through 360° about its vertical axis and supports a disk cutting tool (60) which may be secured thereon or picked from a tools magazine also comprising other tools and a plurality of cutting heads. When other tools are used, allows other machining operations than cutting can be performed by the machine. The working surface consists of a conveyor belt (14) made of rubber, in particular disposable rubber, and is supported at the bottom by a fixed metal surface. The machine according to the invention is suitable for insertion along a continuous processing line.

Abstract: “Bretonstone” technology is used for the production of a dual-layer slab or board-like article. The rear layer is formed from a mix comprising an inorganic granular material in expanded form, in particular consisting of beads of expanded glass, expanded day and the like, a filler in the form of a fine powder, preferably cristobalite, and a hardening resin, in particular epoxy resin or polyester. The first layer, which is intended to form the visible side of the article, comprises the same resin or a resin compatible with that present in said rear layer. A web of continuous glass filaments is arranged between the said two layers. The invention also relates to the article or slab which can be obtained by the abovementioned method.

Abstract: A method of manufacturing an article in the form of a reinforced slab, which has upper and lower surface that are flat and parallel, includes the step of providing granulate of a predefined grain site, binder; preparing a cement mixture; distributing the mixture in a tray-like mold; deaeration by intense vacuum; vacuum vibrocompaction; hardening and setting; and extraction.

Abstract: A reinforced slab, in particular able to withstand concentrated loads, has a substantially flat reinforcing structure (20) which is situated at a distance from the bottom (12) of the mould (10) and arranged at a height such as to allow embedding of said reinforcing structure (20) within the end product (40), said reinforcing structure consisting of a sheet oriented substantially parallel to the surfaces of said slab and having a plurality of holes or openings. Preferably said sheet is provided with stiffening ribs and the edges of the holes or openings are folded in the form of a “U”. The method for manufacturing the reinforced slab is a method known as “Terastone”, except for the step involving insertion, in the forming mould, of the reinforcing structure which is positioned at the desired height by means of support feet.

Abstract: An apparatus for machining an article (L) in the form of a slab or the like comprises—in addition to a rotary tool (24) associated with a spindle (22)—a nozzle (26) ejecting water at very high pressure. Both the rotary tool and the nozzle are supported by a carriage (20) sliding along a beam (18) in turn sliding along two shoulders (14) in a perpendicular direction. In the working area (12) and above a tank (30) normally filled with water, the article (L) is supported in a horizontal position not only by an interchangeable grid (32; 52), but preferably also by a disposable support (34) which prevent the rotary tool (24) from coming into contact with the grid. The disposable support is periodically replaced.

Abstract: A machine for processing, in particular for cutting workpieces in the form of slabs, comprises a spindle (36) slidably supported by a beam (32) displaceable transversely with respect to the longitudinal direction of a working surface (12). The beam is in turn slidably supported at its ends by two bridge structures (22, 24) situated at the two ends of said working surface. The spindle (36) is rotatably adjustable through 360° about its vertical axis and supports a disk cutting tool (60) which may be secured thereon or picked from a tools magazine also comprising other tools and a plurality of cutting heads. When other tools are used, allows other machining operations than cutting can be performed by the machine. The working surface consists of a conveyor belt (14) made of rubber, in particular disposable rubber, and is supported at the bottom by a fixed metal surface. The machine according to the invention is suitable for insertion along a continuous processing line.

Abstract: In the manufacture of slabs and panels of ceramic material according to the vacuum vibrocompaction method described in Italian patent 1,311,858, the initial mix is formed using ceramic having the form of sands having a grain size of less than 2.5 mm, preferably less than 1 mm, and ceramic powders, together with a binding additive in the form of an aqueous solution consisting of sodium silicate in a concentration greater than 24° Baumé, fibres of high-melting transparent inorganic material, preferably high-melting glass, also being added to the mix. The slabs obtained have an improved mechanical strength, a reduced porosity and improved aesthetic properties, in addition to being free from cracks and microscopic fissures.

Abstract: A reinforced slab, in particular able to withstand concentrated loads, has a substantially flat reinforcing structure (20) which is situated at a distance from the bottom (12) of the mould (10) and arranged at a height such as to allow embedding of said reinforcing structure (20) within the end product (40), said reinforcing structure consisting of a sheet oriented substantially parallel to the surfaces of said slab and having a plurality of holes or openings. Preferably said sheet is provided with stiffening ribs and the edges of the holes or openings are folded in the form of a “U”. The method for manufacturing the reinforced slab is a method known as “Terastone”, except for the step involving insertion, in the forming mould, of the reinforcing structure which is positioned at the desired height by means of support feet.

Abstract: A core is provided with a coating formed by an agglomerate obtained by hardening of a mixture comprising a granulated stone material, preferably of the type having a high hardness factor and light color, and a hardening resin, preferably an epoxy resin, for manufacturing a roller or cylinder of a non-porous external surface, the roller being used for the processing of materials and products. For the manufacture of the roller, a formwork having a cavity for housing a core is prepared so as to provide an interspace which is filled with the mixture, following which compacting of the mixture present in the interspace and then the resin hardening step are performed to obtain a non-porous agglomerate.

Abstract: Conveyor belt (1), comprises projections (2) and (3) of triangular shape, inclined in opposite direction. In this manner the article being conveyed (4) cannot slide even under the action of thrusts F.sub.1 and F.sub.2 directed in opposite directions, which may be applied on the article (4) by different machines during operation on the article (4) being conveyed by the conveyor (1).