Abstract: The invention relates to glass reinforcement strands, the composition of which comprises the following constituents in the limits defined below, expressed as percentages by weight: 58 to 63% SiO2; 10 to 16% Al2O3; 16 to 23% CaO; 0.5 to 3.5% MgO; 0 to 2% Na2O+K2O+Li2O; 1 to 1.5% TiO2; 0 to 1.5% B2O3; 0 to 0.4% Li2O; 0 to 0.4% ZnO; 0 to 1% MnO; and 0 to 0.5% F. These strands have improved properties in terms of mechanical strength, acid resistance and high-temperature resistance for a low-cost composition. The invention also relates to a process for producing the said strands and to the composition allowing them to be produced.

Abstract: The invention relates to reinforcing glass yarns of which the composition comprises the following components within the limits defined below expressed in weight percent: SiO2 62-72% Al2O3 4-11% CaO 8-22% MgO 1-7% Na2O + K2O + Li2O 0-9% BaO + SrO 0-4% B2O3 0-4% F2 0-2% Other components: TiO2 + ZrO2 + 0-4% Fe2O3 (total iron) + P2O5 + MnO + Cr2O3 + MoO3 + ZnO + SO3 These yarns consist of an economical glass offering an excellent comprise between its mechanical properties represented by the specific Young's modulus and its drawing conditions. The invention also relates to the glass composition suitable for manufacturing said glass yarns, the basic structures of such yarns, in particular meshes, fabrics and mats, and the composites incorporating such yarns.

Abstract: The invention relates to a structure based on glass fiber coated with a resin composition designed to reinforce bonded abrasive articles, the resin composition being characterized in that it comprises the following constituents in the proportions indicated, expressed in percentage by weight of solid matter: 75 to 98% of a mixture of at least one novolac having a glass transition temperature lower than or equal to 60° C. and at least one novolac having a glass transition temperature above 60° C., 0.5 to 10% of at least one wax, 0 to 3.5% of at least one plasticizing agent. The invention also relates to the resin composition suitable for producing the reinforcing structure and bonded abrasive articles incorporating such a structure, in particular abrasive grinding wheels.

Abstract: The invention relates to a glass yarn capable of being obtained by a method consisting of mechanically drawing molten glass threads flowing from orifices disposed at the base of a die, of which the chemical composition is substantially free from boron oxide and comprises the following constituents within the limits defined hereinafter expressed in percentages by weight: SiO2 40 to 50 Al2O3 18 to 28 CaO 4 to 15 MgO 0 to 6 Na2O 10 to 14 Na2O + K2O + Li2O 13 to 20 It also relates to composites containing such yarns.

Abstract: The invention concerns a process for preparing a complex sheet comprising a layer of drylaid glass fibres and a layer of organic fibres, comprising: mechanical needling or fluid entanglement, e.g. hydroentanglement, of a nonwoven fabric of continuous organic fibres and of a veil of non-preconsolidated continuous glass fibres, the said nonwoven fabric of organic fibres and the said veil of glass fibres being juxtaposed and the said needles respectively the fluid, water jets being sent from the same side as the nonwoven fabric of organic fibres, in order to make a sheet; and then application of a binder to the bilayer. The so obtained complex fibrous structure shows a low tendency to delaminate and can be impregnated with asphalt or bitumen, and used in the field of roofing, sealing covering or membranes.

Abstract: The invention concerns a winding frame (1) comprising a chassis (2), said chassis including at least one spindle (6, 7) adapted to support at least one spinning cake (13), said spindle (6, 7) being rotatable about a first axis substantially perpendicular to the diameter of the spinning cake, and at least one traversing device (8) adapted to deposit at least one yarn on the spindle (6, 7) in a first reciprocating movement (C1), the yarn being further deposited on the spindle (6, 7) by a monitoring member in a second reciprocating movement (C2). The invention is characterized in that the monitoring member comprises a device for monitoring the second reciprocating movement.

Abstract: The invention relates to a glass strand, the chemical composition of which is substantially free of boron oxide and comprises the following constituents, in the limits defined below expressed as percentages by weight: SiO2 55 to 65 Al2O3 ?9 to 16 CaO 15 to 26 MgO 1 to 5 BaO + SrO 0.5 to 5?? Na2O + K2O + Li2 O 0 to 2 TiO2 0 to 1 ZnO 0 to 2 ZrO2 0 to 2 It also relates to composites comprising such strands.

Abstract: The invention concerns a process for preparing a complex sheet comprising a layer of drylaid glass fibers and a layer of organic fibers, comprising: mechanical needling or fluid entanglement, e.g. hydroentanglement, of a nonwoven fabric of continuous organic fibers and of a veil of non-preconsolidated continuous glass fibers, the said nonwoven fabric of organic fibers and the said veil of glass fibers being juxtaposed and the said needles respectively the fluid, water jets being sent from the same side as the nonwoven fabric of organic fibers, in order to make a sheet; and then application of a binder to the bilayer. The so obtained complex fibrous structure shows a low tendency to delaminate and can be impregnated with asphalt or bitumen, and used in the field of roofing, sealing covering or membranes.

Abstract: The invention relates to a process for manufacturing a glass by melting, at more than 1300° C., batch materials comprising silica and an alkali or alkaline-earth metal sulfate, characterized in that a sulfide is added to the batch materials in order to reduce the height of foam at the surface of the bath of liquid glass at more than 1300° C. The invention reduces the formation of foam at the surface of the glass and improves the heat exchanges between the overhead burners and the glass bath. The invention is particularly suitable for glass intended to be fiberized.

Abstract: A leasing device including at least one first part connected to a frame element of a reeler and at least one second part including a mechanism for depositing and guiding at least one thread. The first part and the second part are connected to one another such that the second part occupies a first working position, in which the thread can be deposited in the form of a reel, and a second position, in which the second part is separated from the first part, corresponding to a maintenance phase of the second part.

Abstract: Glass reinforcement strand, the composition of which comprises the following constituents, within the limits defined below, expressed as percentages by weight: SiO2 50 to 60%, preferably SiO2 ? 52% and/or SiO2 ? 57%; Al2O3 10 to 19%, preferably Al2O3 ? 13% and/or Al2O3 ? 17%; B2O3 16 to 25%; ZrO2 0.5 to 1.5%; Na2O ?1.5%, preferably Na2O ? 0.8%; K2O ?1.5%, preferably K2O ? 0.8%; R2O ?2%, preferably R2O ? 1%; CaO ?10%; MgO ?10%; F 0 to 2%; TiO2 0 to 3%; RO 4 to 15%, preferably RO ? 6% and/or RO ? 10%; and Various ?3%, where R2O = Na2O + K2O + Li2O, and RO = CaO + MgO. The dielectric properties of such glass compositions are particularly advantageous in the MHz and GHz ranges.

Abstract: A reinforcement device, especially for the bottom of a bushing having a multitude of holes from which filaments, e.g., glass filaments, are drawn, including a reinforcement piece that includes a hollow first part defining at least one receiving housing and a second part that extends at least partly over the length of the hollow part, and also at least one stiffener inserted into the receiving housing of the hollow part. The cross section of the stiffener is substantially identical to the internal cross section of the hollow part.

Abstract: The invention relates to glass strands coated with a sizing composition which comprises (in % by weight): 25 to 90% of at least one film-forming agent; 3 to 25% of at least one coupling agent; and 2 to 18% of nanoparticles. The invention also relates to a sizing composition that can coat said strands, to the method of obtaining it and to the composites incorporating such strands. The glass strands of the invention have a high wet aging resistance.

Abstract: The present invention relates to a composition for reinforcing strands, characterized in that it includes at least one additive capable of acting at the strands/matrix interface so as to improve the fire resistance of the strands/matrix composite, and it also relates to the strands and composites obtained.