Abstract: A composite flywheel rim has multiple fiber layers in each of a plurality of radially contiguous zones. The layers in the intermediate zones each have a mixture of carbon fiber tows and glass fiber tows. The ratio of carbon fiber tows to glass fiber tows in each layer of any single zone is constant and the ratio incrementally increases zone-by-zone radially toward the outside of the rim, and the distribution of carbon fiber tows is macroscopically uniform in each zone. The flywheel rim is made by winding a band of fiber tows, impregnated with wet resin, onto a mandrel. The macroscopically uniform distribution can be achieved by controlling the correlation between lead rate of the fiber band as it is wound onto the mandrel per mandrel revolution and the winding length.

Abstract: A molding material comprises at least the following components A, B and C, with the component C arranged to contact a composite comprising the components A plus B. The components are elongated members identified as: A A continuous reinforcing fiber bundle, B A thermoplastic polymer or oligomer having a weight average molecular weight of 200 to 50,000 and a melt viscosity lower than that of the component C, and C A thermoplastic resin having a weight average molecular weight of 10,000 or more.

Abstract: To provide an epoxy resin composition suitable as a matrix resin for fiber reinforcement, and a yarn prepreg suitable in unwindability, excellent in higher processability due to drapability, high in the tensile strength of the epoxy resin composition after curing, and high in efficiency of the strength of reinforcing fibers. A yarn prepreg, satisfying the following formulae (1) to (3): 50≦Wf≦80  (1) 20,000≦F≦100,000  (2) F/8,000≦d≦F/2,400  (3) where Wf is the content by weight of the fiber bundle (%), F is the number of filaments in the fiber bundle and d is the width of the prepreg (mm).

Abstract: A molding material comprises at least the following components A, B and C, with the component C arranged to contact a composite comprising the components A plus B. The components are elongated members identified as: A A continuous reinforcing fiber bundle, B A thermoplastic polymer or oligomer having a weight average molecular weight of 200 to 50,000 and a melt viscosity lower than that of the component C, and C A thermoplastic resin having a weight average molecular weight of 10,000 or more.

Abstract: Applying a sizing agent as a water dispersed sizing agent to a continuous carbon fiber bundle consisting of 20,000 to 150,000 filaments, controlling the packing density in a range of 5,000 to 20,000 D/mm, cutting the carbon fiber bundle in a wet state of 10 to 35 wt % in solution content at the time of cutting, and drying with vibration at a solution content of 15 to 45 wt % before drying.

Abstract: A composite flywheel rim has multiple fiber layers in each of a plurality of radially contiguous zones. The layers in the intermediate zones each have a mixture of carbon fiber tows and glass fiber tows. The ratio of carbon fiber tows to glass fiber tows in each layer of any single zone is constant and the ratio incrementally increases zone-by-zone radially toward the outside of the rim, and the distribution of carbon fiber tows is macroscopically uniform in each zone. The flywheel rim is made by winding a band of fiber tows, impregnated with wet resin, onto a mandrel. The macroscopically uniform distribution can be achieved by controlling the correlation between lead rate of the fiber band as it is wound onto the mandrel per mandrel revolution and the winding length.

Abstract: The present invention provides a molding material which is easy to produce and allows a reinforcing fiber bundle to be well dispersed in the molded product obtained by injection molding, etc., a production process thereof, a polyamide based resin composition with good flowability, and molded products obtained from them.

Abstract: To provide an epoxy resin composition suitable as a matrix resin for fiber reinforcement, and a yarn prepreg suitable in unwindability, excellent in higher processability due to drapability, high in the tensile strength of the epoxy resin composition after curing, and high in efficiency of the strength of reinforcing fibers.

Abstract: To provide an epoxy resin composition suitable as a matrix resin for fiber reinforcement, and a yarn prepreg suitable in unwindability, excellent in higher processability due to drapability, high in the tensile strength of the epoxy resin composition after curing, and high in efficiency of the strength of reinforcing fibers. A yarn prepreg, satisfying the following formulae (1) to (3): 50≦Wf≦80  (1) 20,000≦F≦100,000  (2) F/8,000≦d≦F/2,400  (3) where Wf is the content by weight of the fiber bundle (%), F is the number of filaments in the fiber bundle and d is the width of the prepreg (mm).

Abstract: A bundle of short chopped carbon fibers impregnated with a sizing agent, the short fiber bundle having an average weight per unit length of 1.7 to 4 mg/mm in the fiber length direction and a coefficient of variation of 30 to 60% in the distribution of weight per unit length in the fiber length direction.

Abstract: An FRP curved pipe, particularly suitable for an FRP racket, good in resin flowability and deaeration at the time of molding, less in surface defects and excellent in strength can be obtained by a structure comprising an inner layer including a reinforcing fiber and an outer layer including a non-woven fabric having a single fiber diameter of not greater than 20 .mu.m and a weight per unit area of not greater than 100 g/m.sup.2.

Abstract: A method for manufacturing a precursor wire for a CFRM material, which comprised a continuous carbon fiber bundle of carbon filaments as a reinforcement and a metal as a matrix. In a pretreatment process, the fiber bundle with a sizing agent adhered thereto is passed through an inert atmosphere at a temperature in the range of from 350.degree. to 800.degree. C., thereby thermally decomposing the sizing agent, the chemical structure of the sizing agent including ether linkages, and a residue of thermal decomposition containing the ether linkages is left on the surface of each single filament. In a chemical vapor deposition process, a material gas containing a titanium compound and a boron compound and a reducing gas containing zinc are caused to act simultaneously on the fiber bundle at a temperature in the range of from 700.degree. to 800.degree. C.

Abstract: The present invention relates to a high-strength, high-productivity perform wire for a carbon fiber reinforced aluminum composite material, which comprises: a continuous fiber bundle of carbon filaments having a 2/3-width ranging from 25 to 75 cm.sup.-1, as measured on the basis of Raman spectroscopy, the 2/3-width corresponding to 2/3 of the peak level of a Raman band obtained corresponding to a wave number of about 1,585 cm.sup.-1, the peak level attributed to E.sub.2g symmetric vibration of a graphite structure; one or two materials selected from the group consisting of carbon, silicon carbide, titanium, titanium carbide, boron, and titanium boride, the material(s) covering the individual fibers constituting the continuous fiber bundle; and a matrix consisting essentially of aluminum or aluminum alloy each of which contains 0.1% or less of copper and 0.45% or less of silicon, both by weight based on the weight of matrix, and infiltrated into the continuous fiber bundle.

Abstract: A method for manufacturing a composite material which includes carbon material in a matrix metal by first applying tetraisopropyltitanate to the carbon material so as to wet it, next drying the carbon material which is wetted with the tetraisopropyltitanate, and then combining the carbon material with the matrix metal. This drying may be done by heating up the carbon material which is wetted with the tetraisopropyltitanate to a temperature of 50.degree. C. to 200.degree. C. in the atmosphere. The tetraisopropyltitanate may be dissolved in ethanol when it is being applied to the carbon material. The matrix metal may be a metal selected from the group consisting of aluminum, magnesium, aluminum alloy, and magnesium alloy.