Abstract: A tread (12) for a tire (10) which has a tread surface intended to contact a road surface during running. The tread (12) has at least one cavity opening onto the tread surface when new, called external cavity (14), which has length L, width W and central plane P. The external cavity (14) has bottom (16) and at least two opposite lateral walls (18a, 18b) extending from bottom (16) and a mechanism (20) for ejecting stones during running, which has two protuberances (22a, 22b) from bottom (16) of external cavity, which are disposed at least partially opposite one another at a distance d. Each protuberance (22a, 22b) is inclined respectively from a lateral wall (18a, 18b) of the external cavity (14) towards the central plane P. The distance d between the two protuberances (22a, 22b) is less than or equal to 10% of width W of external cavity (14).

Abstract: The environmental footprint of a tire for a construction plant vehicle is improved. To do so, the elastomer compounds derived from non-fossil resources represent a mass content greater than or equal to 65% of the total mass of the compounds of the tire, at least 75% of the total mass of the compounds of the tire is made up of elastomer compounds each of which has a viscoelastic loss, measured in terms of tan(?), less than or equal to 0.065, and an electrical resistivity greater than or equal to 1E+10 ‘?·cm.

Abstract: A process for the additive manufacturing of a three-dimensional metal part consists of successively solidifying successively deposited layers of metal powder by melting with a laser beam (120), and defining in each of these successive layers at least one core region (210) and/or at least one shell region. The melting of said core regions (210) is effected with said laser beam (120) so as to form weld beads (211) that have identical widths (L), are mutually parallel and are juxtaposed or spaced apart or overlap over a distance less than X % of their width, and the melting of said shell regions is effected similarly to form weld beads that have identical widths to one another and to the weld beads of the core, are mutually parallel and that overlap over a distance greater than X % of their width, X being greater than 0 and less than 100.

Abstract: The coextrusion installation is intended to generate a profiled element for a tire tread by extruding a sublayer made of first elastomeric compound, an overlayer made of second elastomeric compound for forming the tread pattern blocks, and inserts made of third elastomeric compound. The installation includes pre-scrapers followed by scrapers for deepening the embedding trenches, injectors for injecting an insert at the bottom of each embedding trench, and then a covering wall which allows the streams of the second elastomeric compound to meet by filling the embedding trench in question and by covering the corresponding insert so as to embed the said insert at a predetermined embedding depth.

Abstract: The method includes a step (a) of geometric characterization of the profile, during which a first set of geometric remarkable points prepresenting the shape of the profile is provided. In a step (b) of functional characterization of the profile, a second set of functional remarkable points linked to the laying laws which specify the conditions for laying the tire component is provided. The remarkable points are stored in a path chart. At step (c) a series of equidistant virtual points, referred to as “potential guide points”, is defined on the profile, from the first functional remarkable point to the last functional remarkable point. Then, at step (d), the size of the path chart is reduced by applying to the path chart one or more selection criteria in order to select some of the potential guide points and remarkable points.

Abstract: The reinforcing structure for a tire is in the form of a stratified assembly formed of two layers of reinforcing strips of completely connected cross section, and flattened in shape. According to the method, the strips of each layer are laid side by side in a main direction of laying. The strips of the first layer are spaced apart by a distance that is less than the width of the strips of the second layer and in such a way that the edges of the strips of the first layer overlap the edges of the strips of the second layer. The two layers of strips are separated by a layer of uncoupling rubber.

Abstract: Tire (1) for an off-road vehicle, comprising a crown and a tread (22) having a width W and a thickness E of wearable material, this tread (22) having a superposition of at least two layers of materials, a first layer (221) radially on the inside and a second layer (222) radially on the outside of the first layer (221) to contact the ground when the tire is new, this second layer (222) having a thickness E2 relative to the thickness E of wearable material, the tread (22) being provided with at least two narrow grooves (4, 5) running all around the tire which have a zigzagging shape of wavelength L and amplitude A, the wavelength L being between 10% and 120% of the axial width W of the tread (22), and the amplitude A being between 10% and 75% of axial width W. The material of the first layer (221) is chosen with low hysteresis; with a measured tan(?) value at most equal to 0.30.

Abstract: A non-pneumatic tire is provided that has a hub with a central axis. A supporting structure is located outward from the hub in a radial direction, and a shear band is located outward from the supporting structure in the radial direction. Tread is located outward from the shear band in the radial direction. A static discharge element extends from a first radial end of the supporting structure to a second radial end of the supporting structure. The first radial end is located closer to the central axis than the second radial end in the radial direction. The static discharge element is electrically conductive to conduct electricity through the supporting structure.

Abstract: A method for determining the loading of a tire (1) mounted on a vehicle (9) and running along the ground, said tire (1) being equipped with a sensor (10), comprises: acquisition, by the sensor (10), of a measurement signal representative of the change in curvature of the tire (1) during running, determination, from the measurement signal, of measurement data comprising a first parameter representative of a length of a contact patch (6) in contact with the ground (7) during a revolution of the wheel bearing the tire, and determination of the loading of the tire (1) as a function of the first parameter, of the internal pressure of the tire, and of a firmness factor representative of a condition of firmness of the ground, which is derived from measurements taken while the tire is rolling over said ground.

Abstract: Drum (10) for manufacturing a tire blank, comprising a shaft, two flanges (14) movable in translation along the shaft, and means for supplying compressed air, each flange comprising at least one pneumatic effector (36). At least one flange comprises a first, radially internal ring (46) and a second, radially external ring (48) movable in rotation around the first ring by means of at least two airtight pivot connections (50), the rings and the pivot connections delimiting at least one sealed chamber (52), said flange comprising at least one first compressed-air circulation channel (54), a first section (56) of the first channel belonging to the first ring being connected at one of its ends to the sealed chamber, and a second section (58) of the first channel belonging to the second ring being connected at one of its ends to the sealed chamber.

Abstract: A process for manufacturing an article made of recovered rubber crumb is provided. According to the process: a) crumb particles are mixed with particles of a solute; b) a molded article is produced by molding the mixture from step a) in a closed mold under predetermined temperature and pressure conditions; and c) the molded article is brought into contact with a solvent so as to dissolve at least one portion of the particles of said solute.

Abstract: The installation comprises a preparation station for preparing strips by cutting a straight wire band, a jointing station arranged to butt-joint the strips obtained from the preparation station so as to form a reinforcing ply, and a station for turning over strips, which is interposed between the preparation station and the jointing station. The installation also comprises a first receiving surface, arranged to receive a strip, a second receiving surface associated with a reversing device which is arranged to transfer a strip from said first receiving surface to said second receiving surface, by thus turning over the strip. A gripping member is arranged to take a strip from the first or second receiving surface in order to allow the jointing station to selectively construct a reinforcing ply with a left-hand ply handle or with a right-hand ply angle.

Abstract: A radial tire (1) for a heavy-duty vehicle of construction plant type, and to reduce the risk of tire tread separation when running over sharp stones, while at the same time ensuring that the crown reinforcement exhibits good resistance to cracking. The tire (1) has a protective reinforcement (50) having three protective layers (51, 52, 53), comprising metal reinforcers that respectively have a diameter (D1, D2, D3) and are distributed at an axial spacing (P1, P2, P3). According to the invention, with Alpha1, Alpha2 and Alpha3 being the angles of the reinforcers of the respective layers (51, 52, 53) with the circumferential direction, the following relationships are satisfied: 15°?|Alpha1|?40° 15°?|Alpha2|?40° Alpha1*Alpha2?0 35°?|Alpha3|?75° As regards the differences between the angles of the reinforcers of the protective layers, the following relationship in terms of absolute values applies: |(Alpha1?Alpha3)|?10° |(Alpha2?Alpha3)|?10°.

Abstract: A device for cutting the profile of a tyre tread (B) in a profiled element made of a raw rubber mixture comprises a frame (1) supporting a cutting assembly (2) and travel means (3) which make it possible for said profiled element (B) to be cut to travel in front of said cutting assembly (2), said cutting assembly (2) comprising at least one cutter (4) for cutting a longitudinal groove (S) in the outer face of said profiled element (B) and means (5) for inducing vibration in said cutter (4) in a transverse direction perpendicular to the direction of travel (X-X?) of said profiled element.

Abstract: An aircraft tire comprises a tread (2), having an axial width L, which comprises a middle portion (3) having an axial width LC at least equal to 50% and at most equal to 80% of the axial width L of the tread and consisting of a middle rubber composition, and two lateral portions (41, 42), positioned axially on either side of the middle portion (3), each having an axial width (LS1, LS2) at least equal to 10% and at most equal to 25% of the axial width L of the tread and each consisting of a lateral rubber composition. The middle rubber composition comprises in particular from 25 to 85 phr of a tin-functionalized butadiene and styrene copolymer and from 15 to 75 phr of isoprene elastomer, and at least one lateral rubber composition is different from the middle rubber composition.

Abstract: An automatic sampling system (100) and an automated sampling method take samples of a rubber strip after shaping and while scrolling in a predetermined direction.

Abstract: A rubber composition is based on at least a diene elastomer, a reinforcing filler, a crosslinking system, an epoxy resin, an amine hardener comprising at least two primary amine functions, located on at least one six-membered aromatic ring, and an imidazole.