Abstract: A net-like structure particularly for geotechnical applications which comprises a first and a second layer which are mutually spaced and joined one another by spacers which are co-extruded together with the layers. At least one of the layers comprises at least one set of yarns arranged at one end of the spacers; the spacers have a reduced transverse cross-section.

Abstract: A sheet-like element with customizing elements, highlighting elements, reflective elements, lettering, characters and the like, particularly for building-yard use and for delimiting spaces, comprising a sheet-like body made of plastics that is longitudinally elongated, and comprising a tape provided with graphic markings, characters, designs and the like that is monolithically associated with said sheet-like body.

Abstract: A method for manufacturing sheet-like elements made of plastics, particularly nets and the like, comprising the step of: extruding mixtures based on fully biodegradable thermoplastic material at a temperature between 70 and 100° C. at the beginning of the extrusion process and between 120 and 140° C. at the end of the extrusion process; maintaining an extrusion pressure between 20 and 50 bar; and performing at least one stretching in a preset direction at a temperature between 35 and 60° C.

Abstract: A method for stretching plastic nets and grids having the peculiarity that it consists in subjecting the product to be stretched to irradiation with electromagnetic waves with a wavelength above the infrared range, so as to heat the product by dielectric loss, and in subjecting the product to traction in order to produce stretching in at least one direction. The method allows to substantially improve the ability of the polymer to absorb the energy in order to profitably perform the stretching process.

Abstract: A propeller propulsion unit for aircrafts in general including a rotation shaft driven by a motor, the unit including a single-blade propeller and a counterweight that are connected to the shaft, the counterweight being arranged in a substantially diametrical position with respect to the single blade in order to balance the moment generated by centrifugal force and being variably offset with respect to the axis of the blade in order to balance the moment generated by the traction force of the single-blade propeller.

Abstract: A barrier for delimiting spaces, indicating paths, pointing out dangers and the like, comprising a tubular frame which has a closed shape and to which a sheet-like element made of extruded plastics and closed in a loop can be applied, the sheet-like element being anchored to two mutually opposite portions of the frame by shrinkage produced by a thermal treatment.

Abstract: A sheet-like structure with surface protrusions for he provision of spacing elements, grip-enhancing elements, draining elements and the like, comprising an extruded sheet-like element which has, on at least one face, a plurality of peduncles which are formed monolithically with the sheet-like element during the extrusion thereof and have a solid transverse cross-section.

Abstract: This invention relates to a geogrid structure which is comprised of two or more layers of rigidly bonded flexible mesh structures. The mesh openings of each layer, without superimposing, overlay mesh openings of other layers, resulting in a geogrid structure which consists of small and large sized mesh openings. The smaller sized mesh openings are designed to reduce vertical migration of the smaller aggregate particles into the subgrade and to reduce pumping of the subgrade material into the aggregate layer. The rigid bonding of multiple layers of mesh structure provides a mechanism for transmission of tensile stress which is less dependent upon interlocking of aggregate particles. Furthermore, by bonding multiple layers of mesh structure, the number of tensile elements per unit area is increased, and as a result, the interaction of the geogrid with the fill material is enhanced.

Abstract: A predrawn net particularly for geotechnical use including an initial component that forms a first and a second layers that are respectively constituted by a first set of mutually substantially parallel filaments and by a second set of mutually substantially parallel filaments that lie transversely with respect to the filaments of the first set, so as to form a plurality of mutual joints. The filaments of the two sets mutually interpenetrate in the joints over a thickness that is less than 50% of one of the layers. The initial component is more than 8 mm thick. The filaments of at least one of the sets are drawn in the direction defined by the respective set of filaments so that the stretching action passes through the joints without substantially affecting the filaments of the other one of the sets.

Abstract: A device for reducing the consumption of urea and/or hygroscopic chemical substances, in paste materials for printing cotton, viscose and the like fabrics, includes, upstream of a steaming chamber, a pre-moistening chamber, into which there is introduced saturated steam as well as, in a continuous manner, a printed fabric material. This printed fabric material is caused to pass, for at least a length thereof, through the pre-moistening chamber and, for at least a length thereof, through environment air, in order to be cooled, and then being immediately again introduced into the pre-moistening chamber.

Abstract: A device for reducing the consumption of urea and/or hygroscopic chemical substances, in paste materials for printing cotton, viscose and the like fabrics, includes, upstream of a steaming chamber, a pre-moistening chamber, into which there is introduced saturated steam as well as, in a continuous manner, a printed fabric material. This printed fabric material is caused to pass, for at least a length thereof, through the pre-moistening chamber and, for at least a length thereof, through environment air, in order to be cooled, and then being immediately again introduced into the pre-moistening chamber.

Abstract: The present invention relates to a method for setting dyes on fabrics in general, by a two-step process, which comprises, after the printing and drying of a textile support, an impregnation of the support by an alkali solution.The main feature of the invention is that, on the impregnated support, there is performed a vaporization, by arranging the textile support with free laps on supporting hollow rods inside a fabric-lap evaporizer.

Abstract: The multiple-layer net structure has a first layer of mutually parallel wires which is rigidly associated with a second or intermediate layer of substantially mutually parallel wires, which are inclined with respect to the wires of the first layer. A third layer of wires is rigidly associated with the intermediate layer, on the opposite side thereof with respect to the first layer, and has substantially mutually parallel wires which are inclined with respect to the wires of the second or intermediate layer.

Abstract: The block has a cambered front radiused to tapering side walls. The side walls have, in the portion radiused to the front, mutually opposite insertion-coupling members and seats for accommodating the insertion-coupling members of an adjacent block. The block furthermore has, at an upper part thereof, an abutment for engagement with a supporting element defined on a lower part at the front of an adjacent block.

Abstract: The plastic material net structure, particularly useful for geotechnical applications, has a plurality of holes uniformly arranged in rows and columns. The sheet further comprises portions which are elongated in the stretch direction, are mutually separated by the holes and have a predominance of molecules orientated in the stretch direction. The elongated portions extend from node elements which have a plurality of non-orientated molecules. The node elements are mutually joined by non-oriented transverse portions which extend between said holes in a direction which is substantially perpendicular to the elongated portions. The node elements have a thickness which is greater than the thickness of the transverse portions and of the elongated portions.

Abstract: A process to obtain molecular orientations in perforated plates made of extruded plastic material includes a first heating of the plastic material at an extrusion temperature, the extruding of the plastic material in the form of a perforated plate, a first cooling of said plate, a second heating of the plate at the longitudinal orientation temperature, the longitudinal stretching of the plate, a second cooling of the plate at a temperature approaching room temperature, a third heating of the plate at the longitudinal stabilization temperature, a third cooling of the plate, a fourth heating of the plate at the transverse orientation temperature, the transverse stretching of the plate, a fourth cooling of the plate at the transverse stabilization temperature, and the final cooling of the plate.

Abstract: Improved methods and treating units for the continuous and open width washing of textile products of manufacture, after the printing and/or purging and bleaching thereof, comprising advancing said textile product of manufacture through a treating environment, including a treating bath, on a permeable conveyor and under the control of liquid blades as supplied under recirculating conditions from the bath, with comparatively high flow rates and comparatively low pressures, in such a way that liquid jets provide a dynamic impact and heat entrainment action on the advancing material, material being preferably, while not necessarily, predisposed in laps on permeable conveyor.

Abstract: The invention relates to a process and an equipment to obtain a plate provided with holes directly by extruding plastic materials. The process consists in submitting the material coming out of an extruder head to expansion stresses according to more than one direction and in executing a plurality of perforations in said material submitted to expansion by means of perforating means; the equipment consists of a plurality of perforating devices provided with a reciprocating motion so that they can reach an interference position with respect to the material coming out of the extruder head and of means which, acting at the same time as the perforating devices, are suitable to produce an expansion of the extruded material.