An extruder includes a receptacle for containing material to be extruded. The extruder further includes a dispersion blade positioned within the receptacle and a nozzle secured to the receptacle. The nozzle defines a first opening positioned within an interior of the receptacle, defines a second opening positioned outside of the receptacle and defines a channel which extends from the first opening through the nozzle to the second opening defining a flow path which extends from the first opening, through the channel and to the second opening. The nozzle extends through a wall of the receptacle and into the interior of the receptacle such that the first opening is positioned spaced apart from the wall.

An extruder includes a receptacle for containing material to be extruded. The extruder further includes a dispersion blade positioned within the receptacle and a nozzle secured to the receptacle. The nozzle defines a first opening positioned within an interior of the receptacle, defines a second opening positioned outside of the receptacle and defines a channel which extends from the first opening through the nozzle to the second opening defining a flow path which extends from the first opening, through the channel and to the second opening. The nozzle extends through a wall of the receptacle and into the interior of the receptacle such that the first opening is positioned spaced apart from the wall.

The present invention relates to a method of manufacturing an artificial stone slab with veins comprises preparing a moldable hardenable fluid mixture of a first material (11); pouring said mixture into a mold (20) an upper face being exposed; engraving the exposed upper face with a predefined precise pattern of grooves (30) coinciding with a pattern of thin veins to be obtained; impregnating at least the inner faces (31) of said grooves (30) with a moldable hardenable fluid mixture of a second material (12), the color of both materials being different; causing the collapse and closure of the grooves, a visible pattern of thin veins of a second material with a natural look being left behind; curing the artificial stone slab by subjecting it to vibration, compression and vacuum until the fluid mixtures of the first material and of the second material are hardened.

The invention relates to an additive production method involving the production of a layer of geometrically compact particles, having the following steps: a) providing a particle layer depositing arrangement, comprising a first and a second semi-chamber, wherein a partition separates the first semi-chamber from the second semi-chamber, and the partition is permeable for a dispersion medium and impermeable for particles dispersed in the dispersion medium; b) providing a particle dispersion comprising the dispersion medium and particles dispersed therein in the first semi-chamber, the particle dispersion being distributed substantially homogenously in the first semi-chamber; c) generating a pressure gradient between the first and the second semi-chamber such that the pressure gradient in the first semi-chamber causes a particle dispersion flow directed towards the partition; and d) depositing a particle aggregate material comprising geometrically compact particles on the partition by transporting a dispersion agent into the second semi-chamber.

A machine for dry decoration of ceramic slabs or tiles, comprising: a deposit plane (50); a distributor unit (D), arranged to dispense, in a controlled manner, a ceramic compound in granular or powdered form, formed by two or more different ceramic materials; a storage container (F), interposed between the distributor unit (D) and the deposit plane (50) to store a certain quantity of ceramic compound dispensed by the distributor unit (D), and comprising an unloading opening (O) arranged to allow the deposit of the ceramic compound on the deposit plane (50); wherein the storage container (F) and the deposit plane (50) are in relative movement with respect to one another along a longitudinal direction (Y); a control module, connected to the distributor unit (D) and arranged to control and regulate the dispensing of ceramic compound by the distributor unit (D); The machine comprises one or more sensors (S), connected to the control module and arranged to detect a significant parameter of the quantity of ceramic compound contained in the storage container (F) and to process a corresponding measurement signal; The control module is arranged to regulate the dispensing of ceramic compound as a function of the measurement signal received, so as to maintain a desired amount of ceramic compound inside the container (F).