Abstract: A method and device for manufacturing a body, a device for implementing the method, and products obtained by the method. In the method, at least a first heated composite strip is introduced into at least one die, and at the same time, at least one molten material is introduced into the die in contact with the first composite strip, to obtain at least one second composite strip, and the second composite strip is wound around a support rotating about its axis.

Abstract: The invention relates to a mat comprising discontinuous natural fibers and discontinuous glass fibers, and to the fibrous structures that can be produced using said mat, said structures being intended to reinforce composites. The presence of natural fibers in the mat gives the latter the property of being easy to handle, especially by eliminating the annoying tendency of mats made exclusively of glass fiber to wrinkle uncontrollably. In addition, the mechanical properties of the final composite are remarkable, in particular with regard to the tensile modulus and flexural modulus.

Abstract: The invention concerns a hollow composite product comprising over 20% glass in the form of long fibres, the thickness of the product walls further ranging between 1 and 10 mm about. The invention also concerns a method for making said product, which consists in inserting in a mould (10) a preheated assembly (9) comprising in its core at least an inflatable pocket covered with at least a composite structure, the composite structure including at least a filler material in the form of long fibres and the preheated assembly including a material capable of creeping, and in inflating the inflatable pocket under pressure higher than 40 bars.

Abstract: A method for preparing glass strand pellets by stirring chopped glass strands in the presence of 10 to 25% of water, the strands being sized with a size containing an organosilane. The method performs stirring for long enough for an increase in density to be at least 67%, the stirring being performed using a single stirring equipment that at each instant imparts to the strands or forming pellets it contains the same stirring frequency, the pellets finally formed containing, after drying, at least 95 wt % glass. A film-forming agent is in contact with the glass strands during the stirring at the latest.

Abstract: Method of manufacturing a frustoconical bobbin which is obtained by depositing superposed layers of a yarn onto a cylindrical support of longitudinal axis and comprises a base cone having a generatrix, an unwind cone having a generatrix and a main body having a generatrix which is inclined with respect to the axis and joins the two generatrices of the two cones. The method is characterized in that it comprises two rules governing the movement of the yarn guide, a first rule which is used to form part of the base cone, the last layer of yarn deposited according to this first rule going as far as the end of the unwind cone, and a second rule which is used to terminate the said base cone that has been started and, concomitantly, to form the main body and the unwind cone, the first layer of yarn deposited according to the second rule being parallel to the last layer deposited according to the first rule.

Abstract: The invention relates to a fibrous structure, especially made of glass, comprising at least one layer of randomly distributed continuous strands and at least one reinforcing fabric layer, such as a chopped strand layer, the various layers of the structure being linked together by a mechanical means, such as stitching or needle punching, and/or a chemical means, such as a binder. This structure may be produced continuously or in a batch process. It has good permeability and good deformability when it is used to produce a composite.

Abstract: The present invention relates to reinforcement yarns coated with a sizing composition comprising at least one silane satisfying the formula: Si(R1) (R2) (R3) (R4) in which: R1, R2 and R3 are chosen from the following atoms or groups: —H (except in the case of R3), —Cl, —O—R5, —O—R6—O—R5, —O—(C?O)—R5, —O—R6—(C?O)—R5, R5 and R6 being chosen from hydrocarbon radicals whose main chain has from 1 to 4 carbon atoms; R4?—R7—NHR8 R7 being chosen from branched hydrocarbon radicals whose main chain has from 2 to 6 carbon atoms, R8 being chosen from the following groups: —H, —R9—NH2, —R10—NH—R9—NH2, R9 being chosen from hydrocarbon radicals containing 1 to 12 carbon atoms or from carbonyls, and R10 being chosen from hydrocarbon radicals whose main chain has from 1 to 6 carbon atoms. The glass yarns according to the invention are particularly suitable for reinforcing organic materials, the yarns and composites obtained resisting in a corrosive medium.

Abstract: The invention relates to a process for manufacturing a continuous yarn, and the product obtained from such process. A multiplicity of continuous filaments are formed by the mechanical drawing of a multiplicity of streams of molten thermoplastic(s) flowing from the orifices of at least one fiberizing device. A mixture, in the liquid state, is deposited on the surface of at least some of the filaments before they are brought together into at least one yarn. An absorbent mat may be continuously impregnated, with at least some of said mixture being continuously taken up by means of a rotating roller in contact with said mat, and using a sizing roller, said mixture may be deposited on the filaments while they are being drawn.

Abstract: A fibrous reinforcing material (1) is envisaged which is produced from glass filaments (2), advantageously consisting of fragments of glass yarns (3) or of chopped yarns, having a mean diameter of greater than five micrometers and a mean length of greater than six millimeters. The process comprises a selection step (4a, 4b) during which the glass yarns (3) consisting of filaments having a diameter greater than or equal to five micrometers and less than or equal to twenty-four micrometers are chosen, optionally a step (5) of mixing the selected yarns, and a milling step (6) during which the mixed yarns are chopped into filaments (2) having a length of greater than or equal to six millimeters. Advantageously, the fibrous material is in the form of flakes.

Abstract: An assembly and associated method for cutting strands formed by thermoplastic filaments. The assembly includes a blade-holder wheel and an anvil-wheel rotating in reverse directions about two parallel axes, and at least a mechanism for actuating the wheels and for contacting a strand with the anvil wheel. The assembly further includes a mechanism oscillating the support of the wheels, whereof the axis of the support is parallel to the axis of the wheels, and an associated actuator. A mechanism for contacting the wheels is designed in particular to pinch the strand and the associated actuator for passing the strand between the blade-holder wheel and the anvil-wheel when the wheels are not in contact.

Abstract: A sizing composition which is useful for coating glass strands contains a solution having a solvent content of less than 5% by weight. The solution contains at least 45% by weight of components capable of curing. At least 40% of the components capable of curing have a molecular mass of between 750 and 5000. The components capable of curing contain at least one mixture containing a) one or more components having at least one acrylic reactive functional group and/or methacrylic reactive functional group, and b) one or more components having at least one primary amine reactive functional group and/or secondary amine reactive functional group.

Abstract: Method for sealing a bared section (10) in the wall of a hollow body based on a thermoplastic and on reinforcing fibers, the hollow body being especially intended for conveying or containing a pressurized fluid. The surface and the contours of the section (10) are coated with a protective thermoplastic (30) which is heated while it is being deposited and is compatible with the said thermoplastic of the hollow body in order to achieve complete adhesion.

Abstract: A filler (1) is envisioned which comprises glass-based granules (2) provided with a sizing composition, in which filler each of the granules (2) consists of a multiplicity of milled glass fragments (3) agglomerated together by the agency of a sizing composition (4) containing especially a compound chosen from esters of alkylsilicic acids, particularly an aminosilane. The process comprises a milling step (6) during which the glassy material is comminuted into fragments by this milling, a metering step (7) during which a mixture including the fragments (3) and the sizing composition (4) is formed and an agglomeration step (8) during which the mixture is dried so as to form granules each including a multiplicity of fragments (3) and dried parts of the sizing composition (4).

Abstract: A machine for washing scraps of fibrous material where the fibrous material has been impregnated with resin, and the machine extracts the resin via the use of appropriate solvents. The machine includes a closed, hollow container having an inlet and an outlet. The container encloses at least one conveyor belt. At least one overhead spraying device is situated over the conveyor belt. The overhead spraying device delivers solvent which is contained in at least one solvent tank. A drying device is installed at the finishing end of the conveyor belt so as to be upstream of the outlet of the container. A process is also provided for washing scraps of fibrous material impregnated with resin. The process includes the steps of feeding the scraps into a closed, hollow container, washing the scraps with at least one solvent spray, and drying the washed scraps inside of the container.

Abstract: The present invention relates to a hollow body of revolution (1), the wall of which comprises an internal first region (a) made, at least on its external periphery, of a single thermoplastic organic material A, and a second region having a first part (b), arranged so as to be continuous with the first region (a) and made of a thermoplastic material identical to the material A and of continuous glass yarns embedded in the said thermoplastic material, and a second part (c) forming the external periphery of the hollow body and made only of thermoplastic material. According to the invention, the wall has a volume void content Vv of less than 0.5%, preferably less than 0.2%.

Abstract: A device for coupling two pipes made of composite material based on a reinforced thermoplastic, includes a sleeve (40) threaded on its internal wall and intended to be joined to an end (21) of the first pipe (20) and to an end (31) of the second pipe (30). A sealing element (44) creates a seal in the coupling zone. A first end-piece (11) is intended to be fastened to the end (21) of the first pipe and a second end-piece (12) is intended to be fastened to the end (31) of the second pipe. Each end-piece has over at least part of its external surface (13, 14) a screw thread (15, 16) intended to engage in a complementary manner with the screw thread (48) of the sleeve (40).

Abstract: Process for manufacturing a composite tape (10), consisting in bringing together and in consolidating a multiplicity of continuous yarns (11), characterized in that yarns (11) based on a thermoplastic and on reinforcing fibers are entrained and brought together in a parallel manner in the form of a sheet (12) which enters a zone in which it is heated to a temperature reaching at least the melting point of the thermoplastic and then passes through a rotating impregnation device (80) in order to distribute the molten thermoplastic uniformly and guarantee that the reinforcing fibers are completely impregnated by the latter; next, the sheet (12) is introduced into a shaping and centering device (100) so as to obtain a tape (13) formed by bringing the yarns (11) together so as to be touching, thereby creating transverse continuity; the tape (13) is cooled in order to consolidate the yarns by freezing the thermoplastic and its dimensional characteristics and its appearance are set in order to deliver the said compo

Abstract: A method for filling a receiver with expanded fibers includes the steps of feeding at least one bundle of fibers from at least one roving; introducing the at least one bundle into a portable tool having a manual gripping element, a spray nozzle, an air supply device connected for supplying air to the nozzle, an extraction system configured to hold the at least one bundle and feed the at least one bundle to the nozzle, and an inlet guide positioned to guide the at least one bundle to the extraction system; and using the air supply device to expand the fibers of the at least one bundle in said spray nozzle, and spray the expanded fibers into the receiver.

Abstract: Method for sealing a bared section (10) in the wall of a hollow body based on a thermoplastic and on reinforcing fibers, the hollow body being especially intended for conveying or containing a pressurized fluid. The surface and the contours of the section (10) are coated with a protective thermoplastic (30) which is heated while it is being deposited and is compatible with the said thermoplastic of the hollow body in order to achieve complete adhesion.

Abstract: The invention relates to glass fibers coated with an sizing composition. The said sizing composition, which is obtained in particular from an aqueous solution, comprises as bonding film-forming agents, a combination, of at least one low-molecular-weight polyvinyl acetate A, of at least one thermally self-crosslinking polyvinyl acetate copolymer B, in an A/B weight ratio greater than or equal to 1.