Abstract: A joint portion evaluating method for measuring and evaluating a joint state of a joint portion at which a first joint body and a second joint body are joined together, the joint portion evaluating method including the steps of: acquiring as a reference value a capacitance value of the joint portion in a reference measurement state serving as a reference for measurement conditions; changing a measurement state from the reference measurement state and acquiring as a measured value a capacitance value of the joint portion in a changed measurement state arising after the change of the measurement state; deriving as a measurement evaluation value a value obtained by referencing the measured value with the reference value; and performing an evaluation based on the derived measurement evaluation value.

Abstract: A composite material forming device forms a composite material including a resin and reinforced fibers having electrical conductivity. The composite material forming device includes: a conduction jig having electrical conductivity, the conduction jig being to be placed on a surface of the composite material so as to make a bridge between both end portions of the reinforced fibers in a fiber direction; and an electric current generating unit that generates an electric current in the conduction jig. The conduction jig placed on the surface of the composite material and the reinforced fibers form a closed loop through which the electric current flows so that the closed loop intersects the surface of the composite material.

Abstract: A heating device includes a magnetic field heating coil that inductively heats a composite material by a magnetic field. The composite material has a length in a depth direction and a length in a width direction orthogonal to the depth direction. The magnetic field heating coil has a first coil part provided along the width direction, and a pair of second coil parts provided on both sides of the first coil part in the width direction so as to be continuous with the first coil part, the second coil parts being tilted a predetermined angle ? to one side in the depth direction with respect to the width direction. The first coil part and the second coil parts are symmetric with respect to a line segment drawn in the depth direction at a center of the first coil part in the width direction.

Abstract: A desired shape can be easily realized, and a decrease in strength can be inhibited. A method for producing a composite material includes: an insertion step of inserting an inner member in which a second reinforcing fiber is impregnated with a resin into a space of an outer member that is formed of a woven first reinforcing fiber extending in an undulating manner, the outer member including an opening that is provided at at least one end portion and the space that communicates with the opening; and a composite material forming step of forming a composite material in which the outer member and the inner member are joined to each other by curing the resin of the inner member to join the outer member and the inner member to each other.

Abstract: A method for forming a composite material including reinforcing fibers includes connecting end portions of the reinforcing fibers with equipotential materials to form an electroconductive loop including the reinforcing fibers in the composite material before reaction; and applying a magnetic field in a direction intersecting a plane formed by the electroconductive loop.

Abstract: A method for manufacturing a resin sheet includes a coating step; a heating step; and a pressurizing step. In the coating step, linear metal nanomaterial is coated on a surface of a resin film having thermal plasticity. In the heating step, the resin film having the linear metal nanomaterial coated on the surface thereof is heated and softened. In the pressurizing step, the resin film having the linear metal nanomaterial coated on the surface thereof is pressurized to press the linear metal nanomaterial along a direction orthogonal to the surface on which the linear metal nanomaterial is coated. Thus, the coated linear metal nanomaterial penetrates the resin film to obtain the resin sheet containing the linear metal nanomaterial.

Abstract: A crystallinity measurement device includes a Raman spectroscopy unit configured to acquire a Raman spectrum of resin-containing material including crystalline thermoplastic resin; and an analysis unit configured to calculate crystallinity of the crystalline thermoplastic resin based on an intensity of a low-wavenumber spectrum that is a spectrum in a region of less than 600 cm?1, in the Raman spectrum.

Abstract: A desired shape can be easily realized, and a decrease in strength can be inhibited. A method for producing a composite material includes: an insertion step of inserting an inner member in which a second reinforcing fiber is impregnated with a resin into a space of an outer member that is formed of a woven first reinforcing fiber extending in an undulating manner, the outer member including an opening that is provided at at least one end portion and the space that communicates with the opening; and a composite material forming step of forming a composite material in which the outer member and the inner member are joined to each other by curing the resin of the inner member to join the outer member and the inner member to each other.

Abstract: A method for molding a composite material includes a conductive wire-shaped material arrangement step and a magnetic field application step. The conductive wire-shaped material arrangement step is a step for arranging, in a pre-reaction composite material including reinforcing fibers, a plurality of conductive wire-shaped materials along a direction intersecting the reinforcing fibers with intervals wider than intervals of the reinforcing fibers in a plane on which the reinforcing fibers are arranged. The magnetic field application step is a step for applying a magnetic field in a direction intersecting the plane on which the reinforcing fibers are arranged.

Abstract: Provided is a method of manufacturing a metal nano coil which is suitable for mass production and results in a lower manufacturing cost. The method of manufacturing a metal nano coil includes the steps of: forming, with tension applied to a core member composed of nanofiber of a polymer, a metal thin film on a surface of the core member to fabricate a metal-covered nanofiber; reducing the tension of the metal-covered nanofiber; and heating, with the tension reduced, the metal-covered nanofiber to at or above a boiling point or a thermal decomposition temperature of the polymer and at or below the melting point of the metal thin film to vaporize the core member and shrink the metal thin film into a coil form, so that a hollow metal nano coil is produced.

Abstract: The present invention effects a reduction in production cost and increases yield of a transparent resin molded article and prevents the generation of defects such as bubbles, weld lines, and sink marks. This injection molding device (2A) for a transparent resin molded article is equipped with: a die (3) for injection molding the transparent resin molded article; and a gate (5) that is provided to the peripheral edge of the die (3) and that is the inlet through which a resin material (R) is injected into the die (3). The thickness dimensions (Ta) of the die (3) are in the range of 15-25 mm, and the ratio of the diameter dimensions (D) of the gate (5) to the thickness dimensions (Ta) of the die (3) is set in the range of 1:6 to 1:3.

Abstract: Provided is an adhesive that can provide quick bonding between thermoplastic resins and excellent bond strength, a structure having adhesion provided by the adhesive, and an adhesion method using the adhesive. The adhesive bonds a first member (11) containing a thermoplastic resin or a carbon fiber reinforced thermoplastic resin and a second member (12) containing the thermoplastic resin or the carbon fiber reinforced thermoplastic resin. The adhesive includes a thermoplastic resin as a main component containing a metal nano material that absorbs electromagnetic waves and generates heat.

Abstract: The present invention effects a reduction in production cost and increases yield of a transparent resin molded article and prevents the generation of defects such as bubbles, weld lines, and sink marks. This injection molding device (2A) for a transparent resin molded article is equipped with: a die (3) for injection molding the transparent resin molded article; and a gate (5) that is provided to the peripheral edge of the die (3) and that is the inlet through which a resin material (R) is injected into the die (3). The thickness dimensions (Ta) of the die (3) are in the range of 15-25 mm, and the ratio of the diameter dimensions (D) of the gate (5) to the thickness dimensions (Ta) of the die (3) is set in the range of 1:6 to 1:3.

Abstract: Disclosed are: an ultrasonic welding member which is independent of a first member and a second member and which is held between a surface to be welded of the first member and a surface to be welded of the second member prior to ultrasonic welding between the surface to be welded of the first member and the surface to be welded of the second member having a shape parallel to or fitted into the surface to be welded of the first member, the ultrasonic welding member characterized by including a thermoplastic resin and satisfying a discontinuous forming requirement, an outside opening requirement, and a bonding place reduction requirement; and an ultrasonic welding method using the ultrasonic welding member. The ultrasonic welding member may include a plurality of streaks at least in a part thereof. The ultrasonic welding member may be a substantially lattice-shaped fabric or textile mesh at least in a part thereof.

Abstract: A method for manufacturing a resin sheet includes a coating step; a heating step; and a pressurizing step. In the coating step, linear metal nanomaterial is coated on a surface of a resin film having thermal plasticity. In the heating step, the resin film having the linear metal nanomaterial coated on the surface thereof is heated and softened. In the pressurizing step, the resin film having the linear metal nanomaterial coated on the surface thereof is pressurized to press the linear metal nanomaterial along a direction orthogonal to the surface on which the linear metal nanomaterial is coated. Thus, the coated linear metal nanomaterial penetrates the resin film to obtain the resin sheet containing the linear metal nanomaterial.

Abstract: A cap is applied to a securing structure part for securing structure elements using a fastener passed through through-holes formed in the structure elements, and a collar fastened to the tip part of the fastener. A filler engaging part for engaging a cured filler, configured with a female thread that turns about a center axis, is formed on the inner peripheral surface of the cap. The filler engaging part includes a first helical engagement part formed in the region near the cap inner part of the inner peripheral surface in the center axis direction; and a second helical engagement part formed in the region near the cap opening-end part in the center axis direction, the inner diameter of the second helical engagement part being greater than that of the first helical engagement part, and having a helical direction that is opposite to that of the first helical engagement part.

Abstract: The present invention effects a reduction in production cost and increases yield of a transparent resin molded article and prevents the generation of defects such as bubbles, weld lines, and sink marks. This injection molding device (2A) for a transparent resin molded article is equipped with: a die (3) for injection molding the transparent resin molded article; and a gate (5) that is provided to the peripheral edge of the die (3) and that is the inlet through which a resin material (R) is injected into the die (3). The thickness dimensions (Ta) of the die (3) are in the range of 15-25 mm, and the ratio of the diameter dimensions (D) of the gate (5) to the thickness dimensions (Ta) of the die (3) is set in the range of 1:6 to 1:3.

Abstract: Provided is a method of manufacturing a metal nano coil which is suitable for mass production and results in a lower manufacturing cost. The method of manufacturing a metal nano coil includes the steps of: forming, with tension applied to a core member composed of nanofiber of a polymer, a metal thin film on a surface of the core member to fabricate a metal-covered nanofiber; reducing the tension of the metal-covered nanofiber; and heating, with the tension reduced, the metal-covered nanofiber to at or above a boiling point or a thermal decomposition temperature of the polymer and at or below the melting point of the metal thin film to vaporize the core member and shrink the metal thin film into a coil form, so that a hollow metal nano coil is produced.

Abstract: Provided is an adhesive that can provide quick bonding between thermoplastic resins and excellent bond strength, a structure having adhesion provided by the adhesive, and an adhesion method using the adhesive. The adhesive bonds a first member (11) containing a thermoplastic resin or a carbon fiber reinforced thermoplastic resin and a second member (12) containing the thermoplastic resin or the carbon fiber reinforced thermoplastic resin. The adhesive includes a thermoplastic resin as a main component containing a metal nano material that absorbs electromagnetic waves and generates heat.

Abstract: A cap is applied to a securing structure part for securing structure elements using a fastener passed through through-holes formed in the structure elements, and a collar fastened to the tip part of the fastener. A filler engaging part for engaging a cured filler, configured with a female thread that turns about a center axis, is formed on the inner peripheral surface of the cap. The filler engaging part includes a first helical engagement part formed in the region near the cap inner part of the inner peripheral surface in the center axis direction; and a second helical engagement part formed in the region near the cap opening-end part in the center axis direction, the inner diameter of the second helical engagement part being greater than that of the first helical engagement part, and having a helical direction that is opposite to that of the first helical engagement part.