Abstract: Provided is a glass fiber-reinforced resin molded article with high mechanical strength and in which occurrence of undispersion of glass fiber is suppressed. In the glass fiber-reinforced resin molded article, glass fiber includes a flat cross-sectional shape having a minor axis D1 in the range of 3.0 ?m or more and 10.5 ?m or less and a major axis D2 in the range of 11.0 ?m or more and 29.0 ?m or less, the number average fiber length L (?m) of the glass fiber included in the glass fiber-reinforced resin molded article is in the range of 195 ?m or more and less than 400 ?m, the glass fiber content C (wt %) in the glass fiber-reinforced resin molded article is in the range of more than 50.0 wt % and 80.0 wt % or less, and the D1, D2, L, and C satisfy the following formula (1): 1200.0?C×L2/(D1×D22)?2550.0??(1).

Abstract: Provided is a glass multiple-ply roving that is excellent in impregnation quality of a thermoplastic resin for a random mat and workability in production of a random mat, and can impart excellent strength to a thermoplastic composite material. The glass multiple-ply roving includes a plurality of glass strands, wherein the weight of the glass strands, S, is in the range of 64 to 210 tex, the fiber diameter of the glass strands, D, is in the range of 9.0 to 18.0 ?m, the ignition loss of the glass multiple-ply roving, L, is in the range of 0.55 to 0.94%, and the S, D, and L satisfy the following formula (1): 4.10?1000×S1/2/(D3×L3)?7.10??(1).

Abstract: A glass composition for flat cross-section glass fiber includes 50.00 to 60.00% by mass of SiO2, 9.00 to 18.00% by mass of Al2O3, 3.00 to 9.00% by mass of B2O3, 15.00 to 30.00% by mass of CaO, 0.10 to 5.00% by mass of MgO, 0.01 to 1.00% by mass of Fe2O3, 0.01 to 1.00% by mass of TiO2, and 0.10 to 2.00% by mass in total of Na2O and K2O, in which K2O/Na2O is 0.05 or more and less than 0.50, MgO/Fe2O3 is 4.10 or more and less than 10.00, and the contents C, M, and T, of CaO, MgO, and TiO2, and the total content NK of Na2O and K2O satisfy the following formula (1). 3.00?(C×M×T/NK)1/2?3.

Abstract: Provided is a metal-glass fiber-reinforced thermoplastic resin composite material that can have excellent bonding force and heat cycle resistance between a metal material and a glass fiber-reinforced thermoplastic resin material. The metal-glass fiber-reinforced thermoplastic resin composite material of the present invention is a metal-glass fiber-reinforced thermoplastic resin composite material including a metal material and a glass fiber-reinforced thermoplastic resin material located on at least one surface of the metal material, wherein glass fiber included in the glass fiber-reinforced thermoplastic resin material having a Vickers hardness H in the range of 700 to 800 HV0.2 and an elastic modulus M in the range of 70.0 to 110.0 GPa, and the Vickers hardness H and the elastic modulus M satisfy the following formula (1): 849.5?M3/H?940.5??(1).

Abstract: Provided are flat-cross-section glass fiber that is superior in continuous-production efficiency and mass-production suitability and able to give superior reinforcing ability for resin molded products, and a method for manufacturing flat-cross-section glass fiber from a glass raw material containing a recycled glass material. In the flat-cross-section glass fiber of the present invention, flat-cross-section glass filaments constituting the flat-cross-section glass fiber each have a flat cross-sectional shape having a major axis with a length in a specific range and a minor axis with a length in a specific range, and the coefficient of variation for the lengths of the minor axes is within the range of 8.0 to 26.1%.

Abstract: Provided is a metal-glass fiber-reinforced thermoplastic resin composite material in which productivity of glass fiber, and mechanical strength of a glass fiber-reinforced thermoplastic resin material are high, and excellent heat cycle resistance is provided between a metal material and the glass fiber-reinforced thermoplastic resin material. The metal-glass fiber-reinforced thermoplastic resin composite material includes a metal material, and a glass fiber-reinforced thermoplastic resin material, wherein a difference ?T between a 500 poise temperature T1 and a 10000 poise temperature T2 of glass fiber included in the glass fiber-reinforced thermoplastic resin material is 162 to 181° C., a glass filament has a ratio (long diameter/short diameter) A of a long diameter to a short diameter thereof of 1.5 to 4.5, and a glass content C of the glass fiber-reinforced thermoplastic resin material is 20.0 to 65.0% by mass.

Abstract: Glass fiber including a plurality of flat-cross-section glass filaments each having cross-section in flat shape, the cross-section having major axis within 20.0 to 35.0 ?m, minor axis within 5.0 to 10.0 ?m, and irregular shape ratio R, being ratio of major axis to minor axis, in the range of more than 3.0 and 5.0 or less, wherein the glass fiber has packing rate P, being ratio of cross-sectional area of each flat-cross-section glass filament to area of rectangle circumscribing cross-section of flat-cross-section glass filament, within 77.0 to 92.0%, irregular shape ratio R and packing rate P satisfy formula (1) below, and glass fiber contains SiO2 within 52.0 to 62.0% by mass, Al2O3 within 10.0 to 20.0% by mass, and CaO within 16.7 to 28.1% by mass with respect to total amount of the flat-cross-section glass fiber: 55.9 ? P / R 1 / 4 ? 6 ? 3 .

Abstract: A glass fiber including a plurality of flat-cross-section glass filaments each having a cross-section in flat shape, the cross-section having a major axis in the range of 15.0 to 25.0 ?m, a minor axis in the range of 8.0 to 12.0 ?m, and an irregular shape ratio R, being the ratio of the major axis to the minor axis (major axis/minor axis), in the range of 1.5 to 3.0. The flat-cross-section glass fiber has a packing rate P, being the ratio of the cross-sectional area of each flat-cross-section glass filament to the area of a rectangle circumscribing the cross-section of the flat-cross-section glass filament, in the range of 80.1 to 89.9%, and the irregular shape ratio R and the packing rate P satisfy the following formula (1): 337.6?P3/2/R?421.2 . . . (1).

Abstract: A glass fiber including a plurality of flat-cross-section glass filaments each having a cross-section in flat shape, the cross-section having a major axis in the range of 15.0 to 25.0 ?m, a minor axis in the range of 8.0 to 12.0 ?m, and an irregular shape ratio R, being the ratio of the major axis to the minor axis (major axis/minor axis), in the range of 1.5 to 3.0. The flat-cross-section glass fiber has a packing rate P, being the ratio of the cross-sectional area of each flat-cross-section glass filament to the area of a rectangle circumscribing the cross-section of the flat-cross-section glass filament, in the range of 80.1 to 89.9%, and the irregular shape ratio R and the packing rate P satisfy the following formula (1): 337.6?P3/2/R?421.2 ??(1).

Abstract: In the glass fiber-reinforced resin molded article, the glass fiber has a flat cross-sectional shape having a ratio of the major axis to the minor axis (major axis/minor axis) in the range of 5.0 to 10.0, the thermoplastic resin is polyaryletherketone, the number average fiber length L of the glass fiber having a length of 25 ?m or more contained in the glass fiber-reinforced resin molded article is in the range of 50 to 300 ?m, the proportion PS of the glass fiber having a length of 25 to 100 ?m contained in the glass fiber-reinforced resin molded article is in the range of 20.0 to 60.0%, the proportion PL of the glass fiber having a length of 500 ?m or more is in the range of 1.0 to 15.0%; and the L, PS, PL satisfy the following formula (1). 39.5?L×PS2/(1000×PL)?82.

Abstract: A method for manufacturing glass long fiber using recovered glass fiber, capable of manufacturing glass long fiber in which a recycle rate is increased, increase of a liquid phase temperature of molten glass and narrowing of an operating temperature range of the molten glass are suppressed, and a spinning temperature is low. The method includes a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and a spinning step of spinning the molten glass to obtain glass long fiber, and a content of the recovered glass fiber in the glass raw material is in the range of 11 to 75% by mass, and differences in the contents of SiO2, Al2O3, B2O3, and CaO between the glass fiber mineral material and the recovered glass fiber satisfy a prescribed relationship.

Abstract: A method for manufacturing glass long fiber using recovered glass fiber, capable of manufacturing glass long fiber in which a recycle rate is increased, increase of a liquid phase temperature of molten glass and narrowing of an operating temperature range of the molten glass are suppressed, and a spinning temperature is low. The method includes a glass melting step of melting a glass raw material containing glass fiber recovered from a glass fiber-reinforced resin molded product, and a glass fiber mineral material to obtain molten glass; and a spinning step of spinning the molten glass to obtain glass long fiber, and a content of the recovered glass fiber in the glass raw material is in the range of 11 to 75% by mass, and differences in the contents of SiO2, Al2O3, B2O3, and CaO between the glass fiber mineral material and the recovered glass fiber satisfy a prescribed relationship.

Abstract: A glass composition for glass fiber that has a broad working temperature range and can suppress an elastic modulus difference from that of E-glass fiber. The composition includes 45.60 to 59.00% by mass of SiO2, 0.00 to 8.00% by mass of B2O3, 10.00 to 16.00% by mass of Al2O3, 17.00 to 25.00% by mass of CaO, 0.01 to 9.50% by mass of TiO2, less than 0.03% by mass of P2O5, 0.00 to 9.50% by mass of ZnO, 0.00 to 2.00% by mass of SO3, 0.01 to 11.50% by mass in total of ZnO and SO3, and 0.00 to 2.00% by mass in total of Li2O, Na2O, and K2O, with respect to the total amount. The SiO2 content SI, the B2O3 content B, the TiO2 content T, the ZnO content Z, and the SO3 content SO satisfy the following formula (1). 1.79 ? ( SI / B ) × T / ( Z + SO ) 1 / 4 ? 122.

Abstract: A glass-reinforced resin molded article that enables the anisotropy of a shrinkage ratio and a TD direction shrinkage ratio to be reduced. The glass-reinforced resin molded article includes 10.0 to 90.0% by mass of a glass-reinforcing material and a thermoplastic resin, wherein the glass-reinforcing material includes flat cross-section glass fiber having a flat cross-sectional shape of which a ratio of a major axis to a minor axis is 3.0 to 10.0, a content C of the flat cross-section glass fiber is 10.0 to 80.0% by mass, the major axis D is 25.0 to 55.0 ?m, a proportion P of glass-reinforcing material having a length of 50 to 100 ?m with respect to the total number of glass-reinforcing material having a length of 50 ?m or more is 4 to 50%, and the C, D, and P satisfy the following formula (1): 0 . 4 ? 6 ? P / ( C × D ) 1 / 2 ? 0.99 .

Abstract: Provided is a glass fiber for resin reinforcement that has excellent processability, and enables a fiber-reinforced resin molded article having excellent mechanical properties to be obtained. The glass fiber for resin reinforcement comprises a glass fiber, and organic matter adhered to the surface of the glass fiber, wherein the amount of nitrogen N of the organic matter is 0.010 to 0.600% by mass based on the total amount of the glass fiber for resin reinforcement, the amount of carbon C of the organic matter is 0.120 to 1.500% by mass based on the total amount of the glass fiber for resin reinforcement, the ignition loss L of the glass fiber for resin reinforcement is 0.200 to 2.000% by mass, and the N, C, and L satisfy the following formula (1): 0.220?(N×C)1/2/L?0.405 . . . (1).

Abstract: Provided is a method for manufacturing glass long fiber that can be produced into resin pellets without clogging of recovered glass fiber in a kneader, when glass fiber recovered from a glass fiber-reinforced resin molded product and a resin are kneaded to prepare resin pellets. In the method for manufacturing glass long fiber of the present invention, a glass raw material including glass fiber recovered from a glass fiber-reinforced resin molded product is melted into molten glass, and the molten glass is spun to form glass long fiber.

Abstract: The glass roving cloth includes glass rovings each composed of glass filaments, each having a filament diameter Dt of 9.5 to 30.0 ?m, bundled in a number bundled Ft of 400 to 8000 as a warp yarn and glass rovings each composed of glass filaments, each having a filament diameter Dy of 9.5 to 30.0 ?m, bundled in a number bundled Fy of 400 to 8000 as weft yarns, wherein the weaving density of the warp yarns and weft yarn is 2.0 to 14.0 yarns/25 mm, the average yarn width of the warp yarn and the weft yarn are each 500 to 8000 ?m, the widening rate of the warp yarn and the weft yarn are each 3.0 to 30.0%, the glass occupancy in the warp yarn direction is 90.0 to 106.0%, and the glass occupancy in the weft yarn direction is 75.0 to 99.0%.

Abstract: Provided is a glass composition for glass fiber that suppresses variations in fiber diameter of glass fiber including 45.60 to 59.00% by mass of SiO2, 10.00 to 16.00% by mass of Al2O3, 17.00 to 25.00% by mass of CaO, 0.01 to 9.50% by mass of TiO2, 0.03 to 7.00% by mass of P2O5, 0.00 to 9.50% by mass of ZnO, 0.00 to 2.00% by mass of SO3, 0.01 to 11.50% by mass in total of ZnO and SO3, and 0.00 to 2.00% by mass in total of Na2O, K2O, and Li2O, with respect to the total amount. The content SI of SiO2, the content A of Al2O3, the content C of CaO, the content T of TiO2, the content P of P2O5, the content Z of ZnO, and the content SO of SO3 satisfy the following formula (1): 15.0?(SI/C)2×(A/T)×{P/(SO+Z)}1/4?690.1??(1).

Abstract: Provided is a glass composition for glass fiber that suppresses variations in fiber diameter of glass fiber including 45.60 to 59.00% by mass of SiO2, 10.00 to 16.00% by mass of Al2O3, 17.00 to 25.00% by mass of CaO, 0.01 to 9.50% by mass of TiO2, 0.03 to 7.00% by mass of P2O5, 0.00 to 9.50% by mass of ZnO, 0.00 to 2.00% by mass of SO3, 0.01 to 11.50% by mass in total of ZnO and SO3, and 0.00 to 2.00% by mass in total of Na2O, K2O, and Li2O, with respect to the total amount. The content SI of SiO2, the content A of Al2O3, the content C of CaO, the content T of TiO2, the content P of P2O5, the content Z of ZnO, and the content SO of SO3 satisfy the following formula (1): 15.0?(SI/C)2×(A/T)×{P/(SO+Z)}1/4?690.1??(1).

Abstract: Provided is a glass fiber-reinforced resin molded article having high dimension stability and low dielectric characteristics. In the glass fiber-reinforced resin molded article, the fiber diameter D of glass fiber included in the glass fiber-reinforced resin molded article is in the range of 5.0 to 15.0 ?m, the dielectric constant Dk at a measurement frequency of 1 GHz of the glass fiber is in the range of 4.0 to 7.0, the linear expansion coefficient C of the glass fiber is in the range of 2.0 to 6.0 ppm/K, the number average fiber length L of the glass fiber is in the range of 150 to 400 ?m, and the D, Dk, C, and L satisfy the following formula (1): 57.9?Dk×C1/4×L1/2/D1/4?70.