Abstract:
PURPOSE:To provide a fiber-reinforced plastic composition for compression molding excellent in vibration-damping capacity and also in mechanical properties. CONSTITUTION:The objective composition contains 5-70vol.% reinforcing fiber of 5mm long or more in the matrix resin and has a loss factor of 0.06 or more at 20 deg.C and 250Hz and a flexural modulus of 15,000kg/cm or more. It is a compression-moldable fiber-reinforced plastic composition involving a large internal loss related to good vibration damping, a high elastic modulus with which the composition is sufficiently useful as a structural material, and excellent mechanical characteristics. Thus, the composition is useful as a lightweight structural material in the vibration damping and noise reduction of internal combustion engines, machine tools, power tools, motors and gears.
Abstract:
PURPOSE:To provide the subject composition mainly composed of a thermoplastic resin containing a specified amount of ethylene-vinyl acetate copolymer resin, excellent in sound absorbing characteristics, having a sufficient elastic modulus as a structural material and suitable for a product in which vibration, noise, etc., are serious problems. CONSTITUTION:A sound absorbing resin composition obtained by blending (A) 100 pts.wt. thermoplastic resin (e.g. polyethylene terephthalate or ABS resin) containing 5-70wt.%, preferably 15-40wt.% ethylene-vinyl acetate copolymer resin in which the content of vinyl acetate is 50-90wt.%, preferably 60-85wt.% with (B) 10-100 pts.wt. reinforcing material such as glass fiber, aramid fiber, carbon fiber or whisker having 0.1-15mm length, 10-1000 pts.wt. filler such as iron oxide, talc or carbon fiber, a fire retardant such as antimony oxide or a phosphate, an antistatic agent, a colorant, an ultraviolet absorb etc., as necessary and suitable for equipments in which vibration and noise are serious problems, e.g. an internal combustion engine or an electric tool and sounders, etc., such as a speaker box.
Abstract:
PURPOSE:To improve a not tightening strength and simplify the positioning man-hours of the base body of a nut, by a method wherein the base body of the nut is arranged at a predetermined position in a cavity and the whole surface of the same is coated with a resin in a predetermined thickness. CONSTITUTION:The base body 6 of a nut is screwed into a male screw 4, projected from a mold 1 having a height higher than the same of the base body 6. The molds 1, 2 are mated to form a cavity 3 and the base body 6 is arranged at a predetermined position in the cavity 3 by the pedestal 5, surrounding the base of the male screw 4. Polyamide resin is poured into and cured in the cavity 3 under this condition. When a resin coated nut A is screwed off the male screw 4, the surface of the base body 6 is coated by the resin 7 while the outer periphery of the base body 6 is provided with a hexagonal shape to engage for turning. A round recess 8 remains in a front resin 7', formed on the base body 6, while a female screw 9 is formed on a rear surface resin 7''. The female screw 9 is formed so as to have a diameter, slightly smaller than the female screw 10 of the base body due to contraction, whereby the female screw 9 bites the male screw thread of a bolt to be screwed thereto and an effect to prevent the nut from loosening can be obtained.
Abstract:
PURPOSE:To provide the manufacturing method of a fiber reinforced plastic molded form excellent in productivity by a method wherein reinforcing fibers, impregnated with thermo plastic resin, are wound around a mandrel to form a preliminary molded form, then, the preliminary molded form is heated to a temperature higher than the softening temperature of the thermoplastic resin and is cooled while being pressurized in a mold. CONSTITUTION:A preliminary molded form is formed by a method wherein fibers, impregnated with thermoplastic resin, are wound or braided on a mandrel (core metal or core material). A wound part or a braided part is heated locally to soften the fibers and facilitate the winding of the fibers whereby the raveling of the wound fibers is prevented. A balsa wood, synthetic resin expanded form or the like is used as the material of a core material. The obtained preliminary molded form is heated to a temperature higher than the softening temperature of the thermoplastic resin. The softening temperature is different depending on the kind of the resin and it is 250 deg.C in the case of polyamide while it is 220 deg.C or higher in the case of polybutylene terephthalate, for example. The heated preliminary molded form is cooled while being pressurized in a mold. The temperature of the mold is kept lower than the softening temperature. According to this method, a composite form, excellent in dimensional accuracy and high in strength, may be manufactured with good productivity while the compos ite form may be used for a use in which a resistance to corrosion, insulating property, heat insulating property and lightening property are requested.
Abstract:
PURPOSE:To suppress the deterioration or coloration of a polyimide resin and to improve workability, by filling a mold with the polyimide resin to compress said resin under specific pressure and heating the same to specific temp. during a compression process or after the finish of commpression and demolding the obtained molded body at specific temp. CONSTITUTION:A polyimide resin is a copolymer obtained from aromatic tetracarboxylic acid anhydride or an esterified substance thereof and aromatic diamine. In a first process, a mold is filled with the polyimide resin and, in a second process, the resin is compressed under pressure of 500-5,000kg/cm . In a third process, the resin in th mold is heated to curing temp. which is a 300-600 deg.C range from the glass transition point of the resin to the decomposition temp. thereof and, in a forth process, the molded product is taken out of the mold at temp. being the glass transition point of the resin +100 deg.C or less. The high density molded product free from deterioration or coloration is obtained only by hot press and is excellent in machinability, heat resistance, slidability and dimensional stability.
Abstract:
PURPOSE:To execute automatically and efficiently the locking operation of a resin bolt of nut with a resin washer, by setting up a resin washer and a resin bolt or nut in stacked state at a concaved part on a turn table, by transferring this pair to just under a press cylinder, and by pressing against the resin bolt or nut with this press cylinder. CONSTITUTION:A resin washer 9 is placed in a concaved part 12 at P1 position on a turn table 11. Here the washer 9 is placed with its convex portion 10 upward, namely, the surface locking with a resin bolt or nut upward. The resin bolt or nut to be locked with the washer 9 by a hand 18 with the working of an up and down cylinder 17 at P3 position is set up with the locking surface stacked. Then by the rotation of the turn table 11 which reaches to just under the press cylinder 13 (P3 position), a rod 14 descends and presses against both member. At this time the bolt or nut presses against the resin washer 9, whereby the washer 9 deflects downwardly at the center, and the convex portion 10 naturally fits into the groove portion of the resin nut.
Abstract:
PURPOSE:To reduce the deformation of electromagnetic wave reflecting materials and to confirm forming conditions of a reflector at the forming time by forming a surface protective layer after forming fiber reinforced resin materials and electromagnetic wave reflecting materials. CONSTITUTION:After electromagnetic wave reflecting materials 10 are placed on a fiber reinforced resin materials 12, a top force 22 is brought closely into contact with a bottom force 14, and 50kg/cm molding pressure is applied for 2min to mold them. The top force 22 is raised to open the mold, and molding conditions of electromagnetic wave reflecting materials 10 are confirmed. A glass surface mat 25 (about 30g/m ) is placed as a protective layer 24 on electromagnetic wave reflecting materials 10, and an unsaturated vinylester resin compound is mixed with a hardener and is supplied from a resin supply device 26, an the top force 22 is brought closely into contact with the bottom force 14 again to form them by pressurizing and heating. Thus, the electromagnetic wave reflector where electromagnetic wave reflectin materials 10, fiber reinforced resin materials 12, an the protective layer 24 are laminated into one body is obtained.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a panel for information display that decreases the defective fraction of a particle-charged substrate by appropriately removing the aggregate of particles sticking on the tip of a spraying nozzle and the peripheral portion of the nozzle, and to provide a particle charging device. SOLUTION: In the method, when particle charging processes of spraying and charging a particle group 15 as a display medium in the cell of a substrate 17 placed in a chamber 19 through piping 13 (13-1, 13-2) and the spraying nozzle 12 connected to the tip of the piping from a feeder 11 are successively carried, dry air is blown to the spraying nozzle 12 from the opening of a cleaning nozzle 20 capable of having the opening disposed nearby the tip of the spraying nozzle 12 in the chamber 19 between the respective particle charging processes, thereby removing the aggregate of particles sticking on the tip of the spraying nozzle 12 and the peripheral portion of the nozzle. COPYRIGHT: (C)2009,JPO&INPIT