Abstract: A fuel tank includes: a tank main body made of a resin material; and a cover member which is formed using threads made of a fiber-reinforced composite material containing a thermoplastic resin fusible to a surface of the tank main body. The cover member has a twill weave structure at least in its portion fused to the upper surface of the tank main body. The threads each have a core-sheath structure in which a fiber made of a polypropylene resin is coated with a polyethylene resin.

Abstract: Provided is a core-sheath composite fiber which is easily moldable into a composite material or the like and is also excellent in strength. The core-sheath composite fiber comprises a core member containing polyamide and a sheath member containing modified polyethylene, and the core member has a melting point higher by at least 170° C. than a melting point of the sheath member.

Abstract: A fuel tank includes: a tank main body made of a resin material; and a cover member which is formed using threads made of a fiber-reinforced composite material containing a thermoplastic resin fusible to a surface of the tank main body. The cover member has a twill weave structure at least in its portion fused to the upper surface of the tank main body. The threads each have a core-sheath structure in which a fiber made of a polypropylene resin is coated with a polyethylene resin.

Abstract: A process of producing a hollow resin-molded article includes: arranging covers on inner walls of mold halves, the covers having shapes corresponding to the inner walls; introducing a pair of sheets of thermoplastic resin each facing the cover arranged on the inner wall of a corresponding mold half; blowing air into a space between the sheets to cause the sheets to respectively contact the covers arranged on the inner walls, and thereby fusion-welding the sheets to the covers; and closing the mold halves; and cooling down the covers and the sheets in a state where the mold halves are closed. In the step of arranging, there are uncovered portions of the inner walls that are not covered by the cover. In the step of closing, there are mold contact portions of the sheets that respectively contact the uncovered portions directly and the mold contact portions are fusion-welded to each other in an overlapping manner.

Abstract: A method of fabricating a bow stick includes winding a prepreg, in which a fiber is impregnated with a resin, on a mandrel with a diameter gradually decreasing toward a distal end, setting a semi-fabricated product, in which the prepreg is wound on the mandrel, into a mold and molding the semi-fabricated product in a shape corresponding to a cavity formed between the mold and the mandrel by heating and pressurizing the semi-fabricated product in the mold, and taking out the mandrel from a molded product molded in the shape corresponding to the cavity to acquire a long and hollow stick body. When adjusting at least one of a weight distribution, a center of gravity, and a weight of the stick body, the volume of the cavity is changed using the mandrel of which the diameter or the diameter variation is gradually changed in an axis direction.

Abstract: A method of fabricating a bow stick includes winding a prepreg, in which a fiber is impregnated with a resin, on a mandrel with a diameter gradually decreasing toward a distal end, setting a semi-fabricated product, in which the prepreg is wound on the mandrel, into a mold and molding the semi-fabricated product in a shape corresponding to a cavity formed between the mold and the mandrel by heating and pressurizing the semi-fabricated product in the mold, and taking out the mandrel from a molded product molded in the shape corresponding to the cavity to acquire a long and hollow stick body. When adjusting at least one of a weight distribution, a center of gravity, and a weight of the stick body, the volume of the cavity is changed using the mandrel of which the diameter or the diameter variation is gradually changed in an axis direction.

Abstract: A stick of a string instrument bow includes a base material having an arched-rod shaped carbon fiber resin layer made of carbon fiber resin and a glass fiber resin layer which covers the outer surface of the carbon fiber resin layer and is made of glass fiber resin, and the glass fiber resin layer has a non-adhesion portion formed of an air layer present within the glass fiber resin layer and an adhesion portion which does not include the air layer.

Abstract: In an acoustic sheet which can be used as a head material of a percussion instrument or a head material for a sound box of a string instrument, a plurality of change regions having a crystalline orientation different from a base are dispersed into the base made of a synthetic resin sheet having a uniform crystalline orientation. The acoustic sheet can include a delamination which is formed by delaminating the synthetic resin sheet in a thickness direction.

Abstract: A stick of a string instrument bow includes a base material having an arched-rod shaped carbon fiber resin layer made of carbon fiber resin and a glass fiber resin layer which covers the outer surface of the carbon fiber resin layer and is made of glass fiber resin, and the glass fiber resin layer has a non-adhesion portion formed of an air layer present within the glass fiber resin layer and an adhesion portion which does not include the air layer.

Abstract: A steering wheel for an automobile is provided. The steering wheel comprises: two surface elements, each formed by stacking a decorative layer and a reinforce layer, joined together at seams; a core material layer disposed to the inside of the surface elements; a metal core disposed to the inside of the core material layer, the surface elements, the core material layer, and the metal core being integrated to form the steering wheel; and fiber reinforcing layers which are provided between the reinforce layer and the core material layer, and which bridge one surface element and the other surface element across the seams of the surface elements. The fiber reinforcing layers are made of material selected from glass fibers, carbon fibers, aramide fibers, and metal fibers. Fibers having lengths of at least 25 mm are scattered in the core material layer.

Abstract: A steering wheel for an automobile is provided. The steering wheel comprises: a surface element formed by stacking a decorative layer and a reinforce layer; a core material layer disposed to the inside of the surface elements; and a metal core disposed to the inside of the core material layer, the surface elements, the core material layer, and the metal core being integrated to form the steering wheel, wherein the reinforce layer is made of a sheet molding compound or a bulk molding compound. A manufacturing method for a steering wheel is also provided. The manufacturing method comprises the steps of: forming a metal core; forming a surface element including a decorative layer and a reinforce layer which are stacked together; and forming a core material layer between the metal core and the surface element so that the core metal, the core material layer, and the surface element are integrated, wherein the reinforce layer is formed by heating and pressing a sheet molding compound or a bulk molding compound.

Abstract: A steering wheel for an automobile is provided. The steering wheel comprises: two surface elements, each formed by stacking a decorative layer and a reinforce layer, joined together at seams; a core material layer disposed to the inside of the surface elements; a metal core disposed to the inside of the core material layer, the surface elements, the core material layer, and the metal core being integrated to form the steering wheel; and fiber reinforcing layers which are provided between the reinforce layer and the core material layer, and which bridge one surface element and the other surface element across the seams of the surface elements. The fiber reinforcing layers are made of material selected from glass fibers, carbon fibers, aramide fibers, and metal fibers. Fibers having lengths of at least 25 mm are scattered in the core material layer.

Abstract: The present invention relates to a molding method characterized by kneading a binder comprising an agar having an average molecular weight of 30,000 to 150,000 with a metal powder, a ceramic powder, or a mixed powder thereof, injection-molding the thus obtained molding composition into a green body, removing at least the water from the green body, and then sintering the green body to obtain a molded product.

Abstract: A ribbon-shaped material for FRTP molded objects 1 having a laminate 4 in which a ribbon-shaped reinforcing fiber tow 2 is placed between thermoplastic resin films for supplying matrix resin which are wider than the ribbon-shaped reinforcing fiber tow 2, and in which the thermoplastic resin films 3,3 are fused in side portions 5,5 of the laminate 4, which are along the longitudinal direction of the laminate 4; and a wide material for FRTP molded objects 30,40 obtained by arranging a plurality of the ribbon-shaped materials for FRTP molded objects 1 whereby adjacent ribbon-shaped materials for FRTP molded objects 1,1 overlap each other in a manner such that the side portion 5 of one of the adjacent ribbon-shaped materials for FRTP molded objects 1 is placed on the side portion 5 or the middle portion 6 of the other along the longitudinal direction, and fusing together each overlapping portion 31,41 of the ribbon-shaped materials for FRTP molded objects 1, whereby the reinforcing fiber tows 2 are arranged in pa

Abstract: A structure of synthetic resin foam has a core layer of thermoplastic resin foam and skin layers of non-foamed thermoplastic resin merged with the core layer, and the skin layers gives rise to increase the mechanical strength of the structure.

Abstract: A pre-impregnation has a ribbon-shaped tow of reinforcing fibers and a ribbon of thermoplastic resin laminated on the ribbon-shaped tow and fixed thereto at intervals, and the thermoplastic resin is allowed to uniformly impregnate into the ribbon-shaped tow under heat application so that a void does not take place in the ribbon-shaped tow.

Abstract: A prepreg for a sleeve member of fiber reinforced thermoplastic resin available for a tennis racket or a golf club is woven by using ribbon-shaped reinforcing fiber tows/uni-directional commingle yarns and matrix fiber tows, and the ribbon-shaped reinforcing fiber tows/commingle yarns make the prepreg and, accordingly, the sleeve product thin, light, highly dense, economical and large in mechanical strength.

Abstract: A pre-impregnation has a ribbon-shaped tow of reinforcing fibers and a ribbon of thermoplastic resin laminated on the ribbon-shaped tow and fixed thereto at intervals, and the thermoplastic resin is allowed to uniformly impregnate into the ribbon-shaped tow under heat application so that a void does not take place in the ribbon-shaped tow.

Abstract: A pre-impregnation has a ribbon-shaped tow of reinforcing fibers and a ribbon of thermoplastic resin laminated on the ribbon-shaped tow and fixed thereto at intervals, and the thermoplastic resin is allowed to uniformly impregnate into the ribbon-shaped tow under heat application so that a void does not take place in the ribbon-shaped tow.

Abstract: Using a fiber reinforced thermoplastic resin, component materials of shapes obtained by partitioning the shape of the desired hollow article into a plurality of parts are molded. Reinforcing members 5, made of a prepreg wherein reinforcing fiber is impregnated with thermoplastic resin, are affixed to the junctions of these component materials 1. These are housed within mold 7 as a hollow provisional assembly and a joined unitary body is formed by adding pressure and heating. Using the method of the present invention, it is possible to efficiently manufacture a complicatedly shaped hollow article, the obtained molded article being one which excels in mechanical strength and, moreover, has a surface which is continuous and smooth.