摘要:
A process for producing a molded fiber-reinforced resin by an RTM method includes disposing a molding precursor in a molding cavity of a mold; closing the mold in which the molding precursor is disposed; injecting a heated and pressurized resin into the molding cavity of the mold closed; solidifying the resin injected into the molding cavity; opening the mold after the resin has been solidified; and taking out the molded fiber-reinforced resin from the mold opened.
摘要:
A molding precursor which includes a main body part and a burr formation part protruding outward from the edge of the main body part and extending continuously along the edge, wherein the main body part includes a first base having many reinforcing fibers and a second base having many fibers and has been superposed on the first base in an outer peripheral part of the main body part, the burr formation part is constituted of that part of the second base which protrudes outward from the edge of the main body part, and spaces among the many fibers constitute passages for a molding resin.
摘要:
This invention relates to a method for manufacturing a large FRP member including: disposing a preform containing a reinforcing fiber on a surface of a molding die; covering a molding portion with a bagging material or a mold and providing a suction port and a resin injection port for sealing; evacuating the molding portion through the suction port; heating the molding portion; injecting a thermosetting resin from the resin injection port for impregnating the reinforcing fiber with the resin while a temperature Tm of the molding die and a temperature Tv of the bagging material or the mold are both set to room temperature or more, and a difference ΔT in temperature between the Tm and the Tv is set to 10° C. or less; and curing the resin by maintaining the molding portion at a predetermined temperature Tpc which is equal to or more than room temperature.
摘要:
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.
摘要:
A yarn-threading method and device wherein a suction gun being fed with a pressurized liquid jet of not less than 80 kg/cm.sup.2 G is placed next to a running yarn; the yarn is attracted and taken into a yarn-guide hole of said suction gun, producing a state of attracting the yarn running at a speed of not less than 4,500 m/min.; and with this state of the yarn being maintained, the suction gun is moved to thread the attracted yarn on a winder means rotating at a speed of not less than 4,500 m/min.
摘要:
A method for laser-cutting a carbon fiber substrate such as a preform is configured from fabric material comprising at least carbon fibers, characterized by cutting the carbon fiber substrate at initial conditions which have been set so that the state of the substrate that is being cut with a laser can be suppressed with or prevented from deviating from a target state. By the method, it is possible to effectively solve various problems such as dissipation of heat, positional shifting from the focal length range of the laser, and soot, and the carbon fiber substrate can be stably cut at the target desired state.
摘要:
A method for laser-cutting a carbon fiber substrate such as a preform is configured from fabric material comprising at least carbon fibers, characterized by cutting the carbon fiber substrate at initial conditions which have been set so that the state of the substrate that is being cut with a laser can be suppressed with or prevented from deviating from a target state. By the method, it is possible to effectively solve various problems such as dissipation of heat, positional shifting from the focal length range of the laser, and soot, and the carbon fiber substrate can be stably cut at the target desired state.
摘要:
An RTM molding method comprising disposing a reinforcing fiber substrate in a cavity of a mold consisting of a plurality of dies, clamping the mold, and thereafter injecting resin to complete molding, characterized in that divided areas with respect to the surface direction of the reinforcing fiber substrate are assumed, each divided area is one in which injected resin expands over the entire surface in the area and can be substantially uniformly impregnated in the thickness direction of the substrate, and resin introducing paths are formed for respective assumed divided areas for introducing the injected resin into the respective divided areas; and an RTM molding device. When a relatively large molded product is to be molded, a molding step from resin injection to impregnating/curing can be implemented at high speed without generating a non-resin-flowing area, thereby enabling a high-quality molded product to be produced free from voids, etc., with a molding time shortened and production speed and volume increased.
摘要:
A method of RTM molding wherein a reinforcing fiber substrate is placed in a mold, each of a first and a second resin distribution media exhibiting a resin flow resistance lower than the resistance of the reinforcing fiber substrate is placed on each surface of the reinforcing fiber substrate, and the inside of the mold is evacuated and a resin is injected into the mold to thereby impregnate the reinforcing fiber substrate with the resin injected, characterized in that the first resin distribution medium exhibits a resin flow resistance lower than that of the second resin distribution medium, and the evacuation is carried out through the second resin distribution medium while the resin is injected through the first resin distribution medium. The method can be advantageously employed for producing, in particular, FRP structure which is thick and excellent in designability, lightweight property and/or strength.
摘要:
A coating apparatus which comprises a feeding means to feed a coating liquid, a coating liquid applicator having a slot extending in one direction to discharge the coating liquid fed by the feeding means, and a conveying means to move at least either the coating liquid applicator or a substrate to be coated with the coating liquid relatively one to the other, comprising: (a) a first control means which comprises (a-1) a position detecting means to detect positions of the coating liquid applicator or the substrate which is moved by the conveying means, and (a-2) a controller capable of stopping the coating liquid applicator or the substrate which is moved by the conveying means at a position detected by the position detecting means such that a start-of-coating line of the substrate is in register with the slot of the coating liquid applicator and capable of starting the movement of the coating liquid applicator or the substrate which is stopped at the position; and (b) a second control means which comprises a timer controller capable of transmitting a signal to the controller of the first control means for the movement of the coating liquid applicator or the substrate which is stopped at the position after a desired period which begins with commencement of feeding the coating liquid and is needed for forming a coating liquid bead which is in contact with both the exit aperture of the slot of the coating liquid applicator and the substrate at the start-of-coating line.